DESC:TECHNICAL FIELD
[001]The embodiments herein generally relate to brake systems in vehicles and more particularly, to a brake pressure modulating system for a vehicle, which regulates pressure of the hydraulic fluid from a master brake cylinder assembly to the brake units of the vehicle to restrict lifting of a rear axle of the vehicle thereby restricting nose-dive of the vehicle during braking condition.

BACKGROUND
[002] Generally, a load carrying vehicle is a type of vehicle which has a cargo carrier mounted on a chassis behind a cabin to transport goods. Loading capacity is the primary requirement of the load carrying vehicle. The loading capacity includes pay load and overload capacities of the cargo carried by the cargo carrier. Pay load gives the maximum permissible load allowed by manufacturer to carry goods in service for the overall vehicle to remain intact for its complete life cycle. Over load capacity is the capacity at which the vehicle can bare the maximum load (more than pay load) and it is the main design load at which the vehicle get designed and verified. The load carrying vehicle or other similar vehicles segment is getting very competitive with the demand for more pay-load with higher mileage which in turn warrants for a low kerb weight of the vehicle. With the available technology it is possible to create vehicles with lower kerb weight. However, it may have the implications on the vehicle architecture and the stability. During braking condition of the vehicle, the wheels of the vehicle locks up due to excessive braking pressure applied to the brake units of the vehicle and the rear axle of the vehicle lifts up due to the lower weight of the rear axle which in turn may result in severe nose-dive of the vehicle.
[003] One conventional solution to restrict the lifting of the rear axle is to increase the weight of the rear axle of the vehicle. However, increasing the weight of the rear axle increases an overall weight of the vehicle and also reduces the pay load capacity of the load carrying vehicle.
[004] Another conventional solution discloses an antiskid braking system for controlling hydraulic braking pressure to alleviate a lock of wheels so as to control a skid of the wheel and alters the hydraulic braking pressure by repeating at least a pressure reducing phase and a pressure increasing phase. However, this system uses more electronic sensors which makes the system complex to implement in the vehicles.
[005] Therefore, there exists a need for a brake pressure modulating system for a vehicle, which obviates the aforementioned drawbacks. Further, there exists a need for a brake pressure modulating system for a vehicle, which regulates pressure of the hydraulic fluid from a master brake cylinder assembly to the brake units of the vehicle to restrict lifting of a rear axle of the vehicle thereby restricting nose-dive of the vehicle during braking condition.
OBJECTS
[006] The principal object of an embodiment of this invention is to provide a brake pressure modulating system for a vehicle, which regulates pressure of the hydraulic fluid from a master brake cylinder assembly to the brake units of the vehicle to restrict lifting of a rear axle of the vehicle thereby restricting nose-dive of the vehicle during braking condition.
[007] Another object of an embodiment of this invention is to provide a brake pressure modulating system for a vehicle, which enables better stability of the vehicle during braking condition.
[008] Yet another object of an embodiment of this invention is to provide a brake pressure modulating system for a vehicle, which restricts locking of the front wheels of the vehicle during braking condition.
[009] These and other objects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[0010] The embodiments of the invention are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0011] FIG. 1 depicts a hydraulic circuit diagram of a brake pressure modulating system for a vehicle, according to a first embodiment of the invention as disclosed herein;
[0012] FIG. 2 depicts a hydraulic circuit diagram of a brake pressure modulating system for a vehicle, according to a second embodiment of the invention as disclosed herein;
[0013] FIG. 3 depicts a hydraulic circuit diagram of a brake pressure modulating system for a vehicle, according to a third embodiment of the invention as disclosed herein; and
[0014] FIG. 4 depicts a hydraulic circuit diagram of a brake pressure modulating system for a vehicle, according to a fourth embodiment of the invention as disclosed herein.

DETAILED DESCRIPTION
[0015] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0016] The embodiments herein achieve a brake pressure modulating system for a vehicle, which regulates pressure of the hydraulic fluid from a master brake cylinder assembly to the brake units of the vehicle to restrict lifting of a rear axle of the vehicle thereby restricting nose-dive of the vehicle during braking condition. Referring now to the drawings, and more particularly to FIGS. 1 through 4, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0017] FIG. 1 depicts a hydraulic circuit diagram of a brake pressure modulating system 100 for a vehicle, according to a first embodiment of the invention as disclosed herein. In the first embodiment, the brake pressure modulating system 100 includes at least one first load sensing pressure modulator valve assembly 102, at least one second load sensing pressure modulator valve assembly 104, a master brake cylinder assembly M, a left front brake unit L1, a right front brake unit R1, a left rear brake unit L2, a right rear brake unit R2, a brake pedal P, a plurality of brake tubes (not shown), at least one tank (not shown) and may include other standard components as present in standard hydraulic brake system of the vehicle.
[0018] In the first embodiment, the first load sensing pressure modulator valve assembly 102 is adapted to detect/sense the load of the vehicle and accordingly regulates/modulates the pressure of the hydraulic fluid from a first chamber F (as shown in fig. 1) and a second chamber S (as shown in fig, 1) of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 respectively, on engagement of the brake pedal P to restrict the lifting of a rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle. In the first embodiment, the first load sensing pressure modulator valve assembly 102 is adapted to be provided in fluid communication with the first chamber F of the master brake cylinder assembly M, a second chamber S of the master brake cylinder assembly M, the left rear brake unit L2 and the right rear brake unit R2. The first load sensing pressure modulator valve assembly 102 is indirectly connected to a suspension system (not shown) of the vehicle to sense the load of the vehicle. It is also within the scope of the invention to directly or indirectly connect the first load sensing pressure modulation valve assembly 102 to any other components or any other vehicle system to sense the load of the vehicle.
[0019] In the first embodiment, the second load sensing pressure modulator valve assembly 104 is adapted to detect/ sense the load of the vehicle and accordingly regulates/modulates the pressure of the hydraulic fluid from the first chamber F and the second chamber S of the master brake cylinder assembly M to the right front brake unit R1 and the left front brake unit L1 respectively, on engagement of the brake pedal P to restrict the lifting of a rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle. In the first embodiment, the second load sensing pressure modulator valve assembly 104 is adapted to be provided in fluid communication with the first chamber F of the master brake cylinder assembly M, the second chamber S of the master brake cylinder assembly M, the left front brake unit L1 and the right front brake unit R1. The second load sensing pressure modulator valve assembly 104 is indirectly connected to the suspension system (not shown) of the vehicle to sense the load of the vehicle. It is also within the scope of the invention to directly or indirectly connect the second load sensing pressure modulation valve assembly 104 to any other components or any other vehicle system to sense the load of the vehicle.
[0020] The master brake cylinder assembly M includes a first chamber F, a second chamber S and may include other standard components as present in standard master brake cylinder assembly. The first chamber F of the master brake cylinder assembly M is provided in fluid communication with the left rear brake unit L2 and the right front brake unit R1 through the first load sensing pressure modulation valve assembly 102 and the second load sensing pressure modulation valve assembly 104 respectively. The second chamber S of the master brake cylinder assembly M is provided in fluid communication with the right rear brake unit R2 and the left front brake unit L1 through the first load sensing pressure modulation valve assembly 102 and the second load sensing pressure modulation valve assembly 104 respectively. The master brake cylinder assembly M is provided in fluid communication with the tank (not shown).
[0021] The left front brake unit L1 is used to gradually apply braking force to the left front wheel (not shown) of the vehicle on engagement of the brake pedal P. The right front brake unit R1 is used to gradually apply the braking force to the right front wheel (not shown) on engagement of the brake pedal P.
[0022] The left rear brake unit L2 is used to gradually apply braking force to the left rear wheel (not shown) of the vehicle on engagement of the brake pedal P. The right rear brake unit R2 is used to gradually apply braking force to the right rear wheel (not shown) of the vehicle on engagement of the brake pedal P. The brake pedal P is engaged by the driver to apply braking force to the vehicle.
[0023] The plurality of brake tubes (not shown) is used for transportation of hydraulic fluid in the brake pressure modulating system 100. The tank (not shown) is used to store the hydraulic fluid (not shown).
[0024] The working of the brake pressure modulating system 100 is as follows. On engagement of the brake pedal P by the driver, the force applied by the driver on the brake pedal P is converted into hydraulic pressure in the master brake cylinder assembly M. The hydraulic pressure generated in the first chamber F of the master brake cylinder assembly M is provided to the left rear brake unit L2 and the right front brake unit R1 through the first load sensing pressure modulation valve assembly 102 and the second load sensing pressure modulation valve assembly 104 respectively. At the same time, the hydraulic pressure generated in the second chamber S of the master brake cylinder assembly M is provided to the right rear brake unit R2 and the left front brake unit L1 through the first load sensing pressure modulation valve assembly 102 and the second load sensing pressure modulation valve assembly 104 respectively. The first load sensing pressure modulation valve assembly 102 is adapted to regulate (modulate) the pressure of the hydraulic fluid from the first chamber F and the second chamber S of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 respectively based on the load of the vehicle. The second load sensing pressure modulation valve assembly 104 is adapted to regulate (modulate) the pressure of the hydraulic fluid from the first chamber F and the second chamber S of the master brake cylinder assembly M to the right front brake unit R1 and the left front brake unit L1 respectively based on the load of the vehicle. Therefore, the pressure of the hydraulic fluid from the master brake cylinder assembly M is gradually increased (modulated) by the first load sensing pressure modulation valve assembly 102 and the second load sensing pressure modulation valve assembly 104 to facilitate gradual engagement of the left rear brake unit L2 and the right rear brake unit R2, and the right front brake unit R1 and the left front brake unit L1 respectively. Thus, an effective brake pressure modulating system 100 which restricts lifting of the rear axle (not shown) to restrict nose-dive of the vehicle is provided for a vehicle.
[0025] FIG. 2 depicts a hydraulic circuit diagram of a brake pressure modulating system 100 for a vehicle, according to a second embodiment of the invention as disclosed herein. In the second embodiment, the brake pressure modulating system 100 includes at least one first deceleration sensing pressure modulator valve assembly 102, at least one second deceleration sensing pressure modulator valve assembly 104, at least one load sensing pressure modulator valve assembly 106, a master brake cylinder assembly M, a left front brake unit L1, a right front brake unit R1, a left rear brake unit L2, a right rear brake unit R2, a brake pedal P, a plurality of brake tubes (not shown), at least one tank (not shown) and may include other standard components as present in standard hydraulic brake system of the vehicle.
[0026] In the second embodiment, the first deceleration sensing pressure modulation valve assembly 102 is adapted to detect/sense the deceleration of the vehicle and accordingly regulates/modulates the pressure of the hydraulic fluid from a first chamber F (as shown in fig. 2) of the master brake cylinder assembly M to the right front brake unit R1 on engagement of the brake pedal P to restrict the lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle. The first deceleration sensing pressure modulation valve assembly 102 is provided in fluid communication with the first chamber F of the master brake cylinder assembly M and the right front brake unit R1. The first deceleration sensing pressure modulation valve assembly 102 is connected to a chassis (not shown) of the vehicle to detect/sense the deceleration of the vehicle. It is also within the scope of the invention to provide the first deceleration sensing pressure modulation valve assembly 102 to be connected to any other components or any other systems in the vehicle to detect the deceleration of the vehicle.
[0027] In the second embodiment, the second deceleration sensing pressure modulation valve assembly 104 is adapted to detect/sense the deceleration of the vehicle and accordingly regulates/modulates the pressure of the hydraulic fluid from a second chamber S (as shown in fig. 2) of the master brake cylinder assembly M to the left front brake unit L1 on engagement of the brake pedal P to restrict the lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle. The second deceleration sensing pressure modulation valve assembly 104 is provided in fluid communication with the second chamber S of the master brake cylinder assembly M and the left front brake unit L1. The second deceleration sensing pressure modulation valve assembly 104 is connected to the chassis (not shown) of the vehicle to detect/sense the deceleration of the vehicle. It is also within the scope of the invention to provide the second deceleration sensing pressure modulation valve assembly 104 to be connected to any other components or any other systems in the vehicle to detect the deceleration of the vehicle.
[0028] In the second embodiment, the load sensing pressure modulation valve assembly 106 is adapted to detect/sense the load of the vehicle and accordingly regulates/modulates the pressure of the hydraulic fluid from the first chamber F and the second chamber S of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 on engagement of the brake pedal P to restrict the lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle. The load sensing pressure modulation valve assembly 106 is provided in fluid communication with the first chamber F of the master brake cylinder assembly M, the second chamber S of the master brake cylinder assembly M, the left rear brake unit L2 and the right rear brake unit R2. The load sensing pressure modulation valve assembly 106 is indirectly connected to a suspension system (not shown) of the vehicle to detect the load of the vehicle. It is also within the scope of the invention to directly or indirectly connect the load sensing pressure modulation valve assembly 106 to any other components or any other vehicle system to detect the load of the vehicle.
[0029] The master brake cylinder assembly M includes a first chamber F, a second chamber S and may include other standard components as present in standard master brake cylinder assembly. The first chamber F of the master brake cylinder assembly M is provided in fluid communication with the right front brake unit R1 and the left rear brake unit L2 through the first deceleration sensing pressure modulation valve assembly 102 and the load sensing pressure modulation valve assembly 106 respectively. The second chamber S of the master brake cylinder assembly M is provided in fluid communication with left front brake unit L1 and the right rear brake unit R2 through the second deceleration sensing pressure modulation valve assembly 104 and the load sensing pressure modulation valve assembly 106 respectively. The master brake cylinder assembly M is provided in fluid communication with the tank (not shown).
[0030] The left front brake unit L1 is used to gradually apply braking force to the left front wheel (not shown) of the vehicle on engagement of the brake pedal P. The right front brake unit R1 is used to gradually apply the braking force to the right front wheel (not shown) on engagement of the brake pedal P.
[0031] The left rear brake unit L2 is used to gradually apply braking force to the left rear wheel (not shown) of the vehicle on engagement of the brake pedal P. The right rear brake unit R2 is used to gradually apply braking force to the right rear wheel (not shown) of the vehicle on engagement of the brake pedal P. The brake pedal P is engaged by the driver to apply braking force to the vehicle.
[0032] The plurality of brake tubes (not shown) is used for transportation of hydraulic fluid in the brake pressure modulating system 100. The tank (not shown) is used to store the hydraulic fluid (not shown).
[0033] The working of the brake pressure modulating system 100 is as follows. On engagement of the brake pedal P by the driver, the force applied by the driver on the brake pedal P is converted into hydraulic pressure in the master brake cylinder assembly M. The hydraulic pressure generated in the first chamber F of the master brake cylinder assembly M is provided to the right front brake unit R1 and the left rear brake unit L2 through the first deceleration sensing pressure modulator valve assembly 102 and the load sensing pressure modulator valve assembly 106 respectively. At the same time, the hydraulic pressure generated in the second chamber S of the master brake cylinder assembly M is provided to the left front brake unit L1 and right rear brake unit R2 through the second deceleration sensing pressure modulator valve assembly 104 and the load sensing pressure modulator valve assembly 106 respectively. The first deceleration sensing pressure modulation valve 102 is adapted to regulate (modulate) the pressure of the hydraulic fluid from the first chamber F of the master brake cylinder assembly M to right front brake unit R1 based on the deceleration of the vehicle. The second deceleration sensing pressure modulation valve assembly 104 is adapted to regulate (modulate) the pressure of the hydraulic fluid from the second chamber S of the master brake cylinder assembly to the left front brake unit L1 based on the deceleration of the vehicle. The load sensing pressure modulator valve assembly 106 is adapted to regulate (modulate) the pressure of the hydraulic fluid from the first chamber F and the second chamber S of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 respectively based on the deceleration of the vehicle. Therefore, the pressure of the hydraulic fluid from the master brake cylinder assembly M is gradually increased (modulated) by the first deceleration sensing pressure modulation valve assembly 102, the second deceleration sensing pressure modulation valve assembly 104 and the load sensing pressure modulation valve assembly 106 to facilitate gradual engagement of the right front brake unit R1, the left front brake unit L1 and, the left rear brake unit L2 and the right rear brake unit R2 respectively. Thus, an efficient brake pressure modulating system 100 which restricts lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle is provided for a vehicle.
[0034] FIG. 3 depicts a hydraulic circuit diagram of a brake pressure modulating system 100 for a vehicle, according to a third embodiment of the invention as disclosed herein. In the third embodiment, the brake pressure modulating system 100 includes at least one deceleration sensing pressure modulation valve assembly 102, at least one load sensing pressure modulation valve assembly 104, a master brake cylinder assembly M, a left front brake unit L1, a right front brake unit R1, a left rear brake unit L2, a right rear brake unit R2, a brake pedal P, a plurality of brake tubes (not shown), at least one tank (not shown) and may include other standard components as present in standard hydraulic brake system of the vehicle.
[0035] In the third embodiment, the deceleration sensing pressure modulation valve assembly 102 is adapted to detect/sense the deceleration of the vehicle and accordingly regulates/modulates the pressure of the hydraulic fluid from a first chamber F (as shown in fig. 3) of the master brake cylinder assembly M to the left front brake unit L1 and the right front brake unit R1 on engagement of the brake pedal P to restrict the lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle. The deceleration sensing pressure modulation valve assembly 102 is provided in fluid communication with the first chamber F of the master brake cylinder assembly M, the left front brake unit L1 and the right front brake unit R1. The deceleration sensing pressure modulation valve assembly 102 is connected to a chassis (not shown) of the vehicle to detect/ sense the deceleration of the vehicle. It is also within the scope of the invention to provide the deceleration sensing pressure modulation valve assembly 102 to be connected to any other components or any other systems in the vehicle to detect the deceleration of the vehicle.
[0036] In the third embodiment, the load sensing pressure modulator valve assembly 104 is adapted to detect/sense the load of the vehicle and accordingly regulates/modulates the pressure of the hydraulic fluid from a second chamber S (as shown in fig. 3) of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 on engagement of the brake pedal P to restrict the lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle. The load sensing pressure modulator valve assembly 104 is provided in fluid communication with the second chamber S of the master brake cylinder assembly M, the left rear brake unit L2 and the right rear brake unit R2. The load sensing pressure modulator valve assembly 104 is provided in fluid communication with the first chamber F of the master brake cylinder assembly M to identify the failure condition of the first chamber F of the master brake cylinder assembly M. The load sensing pressure modulation valve assembly 104 is indirectly connected to a suspension system (not shown) of the vehicle to detect the load of the vehicle. It is also within the scope of the invention to directly or indirectly connect the load sensing pressure modulation valve assembly 104 to any other components or any other vehicle system to sense the load of the vehicle.
[0037] The master brake cylinder assembly M includes a first chamber F, a second chamber S and may include other standard components as present in standard master brake cylinder assembly. The first chamber F of the master brake cylinder assembly M is provided in fluid communication with the left front brake unit L1 and the right front brake unit R1 through the deceleration sensing pressure modulator valve assembly 102. The first chamber F of the master brake cylinder assembly M is provided in fluid communication with the load sensing pressure modulator valve assembly 104. The second chamber S of the master brake cylinder assembly M is provided in fluid communication with the left rear brake unit L2 and right rear brake unit R2 through the load sensing pressure modulator valve assembly 104. The master brake cylinder assembly M is provided in fluid communication with the tank (not shown).
[0038] The left front brake unit L1 is used to gradually apply braking force to the left front wheel (not shown) of the vehicle on engagement of the brake pedal P. The right front brake unit R1 is used to gradually apply the braking force to the right front wheel (not shown) on engagement of the brake pedal P.
[0039] The left rear brake unit L2 is used to gradually apply braking force to the left rear wheel (not shown) of the vehicle on engagement of the brake pedal P. The right rear brake unit R2 is used to gradually apply braking force to the right rear wheel (not shown) of the vehicle on engagement of the brake pedal P. The brake pedal P is engaged by the driver to apply braking force to the vehicle.
[0040] The plurality of brake tubes (not shown) is used for transportation of hydraulic fluid in the brake pressure modulating system 100. The tank (not shown) is used to store the hydraulic fluid (not shown).
[0041] The working of the brake pressure modulating system 100 is as follows. On engagement of the brake pedal P by the driver, the force applied by the driver on the brake pedal P is converted into hydraulic pressure in the master brake cylinder assembly M. The hydraulic pressure generated in the first chamber F of the master brake cylinder assembly M is provided to the right front brake unit R1 and the left front brake unit L1 through the deceleration sensing pressure modulation valve assembly 102. At the same time, the hydraulic pressure generated in the second chamber S of the master brake cylinder assembly M is provided to the left rear brake unit L2 and the right rear brake unit R2 through the load sensing pressure modulation valve assembly 104. The deceleration sensing pressure modulation valve assembly 102 is adapted to regulate (modulate) the pressure of the hydraulic fluid from the first chamber F of the master brake cylinder assembly M to the right front brake unit R1 and the left front brake unit L1 based on the deceleration of the vehicle. The load sensing pressure modulation valve assembly 104 is adapted to regulate (modulate) the pressure of the hydraulic fluid from the second chamber S of the master brake cylinder assembly M to the right rear brake unit R2 and the left rear brake unit L2 based on the load of the vehicle. Therefore, the pressure of the hydraulic fluid from the master brake cylinder assembly M is gradually increased (modulated) by the deceleration sensing pressure modulation valve assembly 102 and the load sensing pressure modulation valve assembly 104 to facilitate gradual engagement of the right front brake unit R1 and the left front brake unit L1, and the right rear brake unit R2 and the left rear brake unit L2 respectively. Thus, an efficient brake pressure modulating system 100 which restricts lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle is provided for a vehicle.
[0042] FIG. 4 depicts a hydraulic circuit diagram of a brake pressure modulating system 100 for a vehicle, according to a fourth embodiment of the invention as disclosed herein. In an embodiment, the brake pressure modulating system 100 includes a first load sensing pressure modulation valve assembly 102, a second load sensing pressure modulation valve assembly 104, a master brake cylinder assembly M, a left front brake unit L1, a right front brake unit R1, a left rear brake unit L2, a right rear brake unit R2, a brake pedal P, a plurality of brake tubes (not shown), at least one tank (not shown) and may include other standard components as present in standard hydraulic brake system of the vehicle.
[0043] In the fourth embodiment, the first load sensing pressure modulation valve assembly 102 is adapted to detect/sense the load of the vehicle and accordingly regulates/modulates the pressure of the hydraulic fluid from a second chamber S (as shown in fig. 4) of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 on engagement of the brake pedal P to restrict the lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle. The first load sensing pressure modulation valve assembly 102 is provided in fluid communication with the second chamber S of the master brake cylinder assembly M, left rear brake unit L2 and right rear brake unit R2. The first load sensing pressure modulation valve assembly 102 is provided in fluid communication with a first chamber F (as shown in fig. 4) of the master brake cylinder assembly M to identify the failure condition of the first chamber F of the master brake cylinder assembly M. The first load sensing pressure modulation valve assembly 102 is indirectly connected to a suspension system (not shown) of the vehicle to detect/sense the load of the vehicle. It is also within the scope of the invention to directly or indirectly connect the first load sensing pressure modulation valve assembly 102 to any other components or any other vehicle system to detect/sense the load of the vehicle.
[0044] In the fourth embodiment, the second load sensing pressure modulation valve assembly 104 is adapted to detect/sense the load of the vehicle and accordingly regulates/modulates the pressure of the hydraulic fluid from the first chamber F of the master brake cylinder assembly M to the left front brake unit L1 and the right front brake unit R1 on engagement of the brake pedal P to restrict the lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle. The load sensing pressure modulator valve assembly 104 is provided in fluid communication with the first chamber F of the master brake cylinder assembly M, the left front brake unit L1 and the right front brake unit R1. The load sensing pressure modulator valve assembly 104 is provided in fluid communication with the second chamber S of the master brake cylinder assembly M to identify the failure condition of the second chamber S of the master brake cylinder assembly M. The second load sensing pressure modulation valve assembly 104 is indirectly connected to the suspension system (not shown) of the vehicle to detect/sense the load of the vehicle. It is also within the scope of the invention to directly or indirectly connect the second load sensing pressure modulation valve assembly 104 to any other components or any other vehicle system to detect/sense the load of the vehicle.
[0045] The master brake cylinder assembly M includes a first chamber F, a second chamber S and may include other standard components as present in standard master brake cylinder assembly. The first chamber F of the master brake cylinder assembly M is provided in fluid communication with the left front brake unit L1 and the right front brake unit R1 through the second load sensing pressure modulator valve assembly 104. The first chamber F of the master brake cylinder assembly is provided in fluid communication with the first load sensing pressure modulation valve assembly 102. The second chamber S of the master brake cylinder assembly M is provided in fluid communication with the left rear brake unit L2 and the right rear brake unit R2 through the first load sensing pressure modulation valve assembly 102. The second chamber S of the master brake cylinder assembly M is provided in fluid communication with the second load sensing pressure modulation valve assembly 104. The master brake cylinder assembly M is provided in fluid communication with the tank (not shown).
[0046] The left front brake unit L1 is used to gradually apply braking force to the left front wheel (not shown) of the vehicle on engagement of the brake pedal P. The right front brake unit R1 is used to gradually apply the braking force to the right front wheel (not shown) on engagement of the brake pedal P.
[0047] The left rear brake unit L2 is used to gradually apply braking force to the left rear wheel (not shown) of the vehicle on engagement of the brake pedal P. The right rear brake unit R2 is used to gradually apply braking force to the right rear wheel (not shown) of the vehicle on engagement of the brake pedal P. The brake pedal P is engaged by the driver to apply braking force to the vehicle.
[0048] The plurality of brake tubes (not shown) is used for transportation of hydraulic fluid in the brake pressure modulating system 100. The tank (not shown) is used to store the hydraulic fluid (not shown).
[0049] The working of the brake pressure modulating system 100 is as follows. On engagement of the brake pedal P by the driver, the force applied by the driver on the brake pedal P is converted into hydraulic pressure in the master brake cylinder assembly M. The hydraulic pressure generated in the first chamber F of the master brake cylinder assembly M is provided to the front left brake unit L1 and the front right brake unit R1 through the first load sensing pressure modulator valve assembly 102. At the same time, the hydraulic pressure generated in the second chamber S of the master brake cylinder assembly M is provided to the right rear brake unit R2 and the left rear brake unit L2 through the second load sensing pressure modulator valve assembly 104. The first load sensing pressure modulator valve assembly 102 is adapted to regulate (modulate) the pressure of the hydraulic fluid from the first chamber F of the master brake cylinder assembly M to the right rear brake unit R2 and the left rear brake unit L2. The second load sensing pressure modulation valve assembly 104 is adapted to regulate (modulate) the pressure of the hydraulic fluid from the second chamber S of the master brake cylinder assembly M to the left front brake unit L1 and the right front brake unit R1. Therefore, the pressure of the hydraulic fluid from the master brake cylinder assembly M is gradually increased (modulated) by the first load sensing pressure modulation valve assembly and the second load sensing pressure modulation valve assembly 104 to facilitate gradual engagement of the right rear brake unit R2 and the left rear brake unit L2, and the left front brake unit L1 and the right front brake unit R1 respectively. an efficient brake pressure modulating system 100 which restricts lifting of the rear axle (not shown) of the vehicle thereby restricting nose-dive of the vehicle is provided for a vehicle.
[0050] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
,CLAIMS:CLAIMS
We claim,
1. A brake pressure modulating system 100 for a vehicle, said system 100 comprising:
at least one first load sensing pressure modulator valve assembly 102;
at least one second load sensing pressure modulator valve assembly 104; and
a master brake cylinder assembly M having a first chamber F adapted to be provided in fluid communication with a left rear brake unit L2 and a right front brake unit R1 through said first load sensing pressure modulator valve assembly 102 and said second load sensing pressure modulator valve assembly 104 respectively, and a second chamber S adapted to be provided in fluid communication with a right rear brake unit R2 and a left front brake unit L1 through first load sensing pressure modulator valve assembly 102 and said second load sensing pressure modulator valve assembly 104 respectively,
wherein
at least one of said first load sensing pressure modulation valve assembly 102 is adapted to regulate the pressure of the hydraulic fluid from the first chamber F and the second chamber S of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 respectively, based on the load of the vehicle, and said second load sensing pressure modulation valve assembly 104 is adapted to regulate the pressure of the hydraulic fluid from the first chamber F and the second chamber S of the master brake cylinder assembly M to the right front brake unit R1 and the left front brake unit L1 respectively, based on the load of the vehicle, on engagement of a brake pedal P to restrict the lifting of a rear axle of the vehicle thereby restricting nose-dive of the vehicle.

2. The brake pressure modulating system 100 as claimed in claim 1, wherein said first load sensing pressure modulation valve assembly 102 is adapted to be indirectly connected to a suspension system of the vehicle to detect the load of the vehicle.

3. The brake pressure modulating system 100 as claimed in claim 1, wherein said second load sensing pressure modulation valve assembly 104 is adapted to be indirectly connected to a suspension system of the vehicle to detect the load of the vehicle.

4. A brake pressure modulating system 100 for a vehicle, said system 100 comprising:
at least one first deceleration sensing pressure modulator valve assembly 102;
at least one second deceleration sensing pressure modulator valve assembly 104;
at least one load sensing pressure modulator valve assembly 106; and
a master brake cylinder assembly M having a first chamber F adapted to be provided in fluid communication with a right front brake unit R1 and a left rear brake unit L2 through said first deceleration sensing pressure modulator valve assembly 102 and said load sensing pressure modulator valve assembly 106 respectively, and a second chamber S adapted to be provided in fluid communication with a left front brake unit L1 and a right rear brake unit R2 through said second deceleration sensing pressure modulator valve assembly 104 and said load sensing pressure modulator valve assembly 106 respectively,
wherein
at least one of said first deceleration sensing pressure modulator valve assembly 102 is adapted to regulate the pressure of the hydraulic fluid from the first chamber F of the master brake cylinder assembly M to the right front brake unit R1 based on the deceleration of the vehicle, said second deceleration sensing pressure modulator valve assembly 104 is adapted to regulate the pressure of the hydraulic fluid from the second chamber S of the master brake cylinder assembly M to the left front brake unit L1 based on the deceleration of the vehicle, and said load sensing pressure modulation valve assembly 106 is adapted to regulate the pressure of the hydraulic fluid from the first chamber F and the second chamber S of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 respectively, based on the load of the vehicle, on engagement of a brake pedal P to restrict the lifting of a rear axle of the vehicle thereby restricting nose-dive of the vehicle.

5. The brake pressure modulating system 100 as claimed in claim 1, wherein said first deceleration sensing pressure modulator valve assembly 102 is adapted to be connected to a chassis of the vehicle to detect the deceleration of the vehicle.

6. The brake pressure modulating system 100 as claimed in claim 1, wherein said second deceleration sensing pressure modulator valve assembly 104 is adapted to be connected to a chassis of the vehicle to detect the deceleration of the vehicle.

7. The brake pressure modulating system 100 as claimed in claim 1, wherein said first load sensing pressure modulation valve assembly 106 is adapted to be indirectly connected to a suspension system of the vehicle to detect the load of the vehicle.

8. A brake pressure modulating system 100 for a vehicle, said system comprising:
at least one deceleration sensing pressure modulator valve assembly 102;
at least one load sensing pressure modulator valve assembly 104; and
a master brake cylinder assembly M having a first chamber F adapted to be provided in fluid communication with a left front brake unit L1 and a right front brake unit R1 through said deceleration sensing pressure modulator valve assembly 102, and a second chamber S adapted to be provided in fluid communication with a left rear brake unit L2 and a right rear brake unit R2 through said load sensing pressure modulator valve assembly 104,
wherein
at least one of said deceleration sensing pressure modulator valve assembly 102 is adapted to regulate the pressure of the hydraulic fluid from the first chamber F of the master brake cylinder assembly M to the left front brake unit L1 and the right front brake unit R1 based on the deceleration of the vehicle, and said load sensing pressure modulator valve assembly 104 is adapted to regulate the pressure of the hydraulic fluid from the second chamber S of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 based on the load of the vehicle, on engagement of a brake pedal P to restrict the lifting of a rear axle of the vehicle thereby restricting nose-dive of the vehicle.

9. The brake pressure modulating system 100 as claimed in claim 1, wherein said deceleration sensing pressure modulator valve assembly 102 is adapted to be connected to a chassis of the vehicle to detect the deceleration of the vehicle.

10. A brake pressure modulating system 100 for a vehicle, said system comprising:
at least one first load sensing pressure modulator valve assembly 102;
at least one second load sensing pressure modulator valve assembly 104; and
a master brake cylinder assembly M having a first chamber F adapted to be provided in fluid communication with a left front brake unit L1 and a right front brake unit R1 through said second load sensing pressure modulator valve assembly 104, and a second chamber S adapted to be provided in fluid communication with a left rear brake unit L2 and a right rear brake unit R2 through said first load sensing pressure modulator valve assembly 102,
wherein
at least one of said first load sensing pressure modulator valve assembly 102 is adapted to regulate the pressure of the hydraulic fluid from the second chamber S of the master brake cylinder assembly M to the left rear brake unit L2 and the right rear brake unit R2 based on the load of the vehicle, and said load sensing pressure modulator valve assembly 104 is adapted to regulate the pressure of the hydraulic fluid from the first chamber F of the master brake cylinder assembly M to the left front brake unit L1 and the right front brake unit R1 based on the load of the vehicle, on engagement of a brake pedal P to restrict the lifting of a rear axle of the vehicle thereby restricting nose-dive of the vehicle.