Claims:
1. A vehicle braking system comprising:
a) input device having an accelerator lever and a braking lever for generating the braking signal;
b) a control unit connected with the input device and an electric driving motor of the vehicle;
c) an electronic hydraulic unit connected with the control unit and hydraulic cylinder of each wheel ;
d) a wheel speed sensor mounted on braking assembly of each wheel and connected with the control unit; and
wherein the control unit upon receiving the signals from input device operates the electronic hydraulic unit to generate hydraulic pressure and apply the hydraulic pressure on hydraulic cylinder of each wheel for controlling the braking of the vehicle.

2. The vehicle braking system as claimed in claim 1; wherein the input device is a hand operated lever, button or a joystick.

3. The vehicle braking system as claimed in claim 1; wherein the input device is operated to provide braking signal when user driver depress the braking lever.

4. The vehicle braking system as claimed in claim 1; wherein the input device is operated to provide braking signal when user driver release the accelerator lever.

5. The vehicle braking system as claimed in claim 1, wherein the accelerator lever is adapted on the input device through variable resistor.

6. The vehicle braking system as claimed in claim 1, wherein the braking lever is adapted on the input device through variable resistor.

7. The vehicle braking system as claimed in claim 1, wherein the acceleration lever adapted to the input device further comprises at least one potentiometers to provide braking signal to the control unit.

8. The vehicle braking system as claimed in claim 1, wherein the control is connected to the electric driving motor via. an electric motor hub controller.

9. The vehicle braking system as claimed in claim 7, wherein at least one potentiometer is operated to reduce the revolutions per unit (rpm) of the electric driving motor of the vehicle when the accelerator lever is released.

10. The vehicle braking system as claimed in claim 1, wherein the braking lever adapted to the input device comprises a brake switch and a potentiometer.

11. The vehicle braking system as claimed in claim 10, wherein the braking switch of the braking lever is operated to provide signal to the control unit to switch off the power supply of the electric driving motor of the vehicle when the braking lever is depressed.

12. The vehicle braking system as claimed in claim 10, wherein the potentiometer is operated to provide braking signal to the electronic hydraulic unit of the braking system to provide hydraulic pressure on each brake callipers of the vehicle.

13. The vehicle braking system as claimed in claim 1, wherein the electronic hydraulic unit is connected to the electronic control unit of the vehicle.

14. The vehicle braking system as claimed in claim 1, wherein the electronic hydraulic unit comprises an electric motor; a hydraulic unit driven by the electric motor, a centrifugal pump, a pressure sensor unit.

15. The vehicle braking system as claimed in claim 1, wherein the wheel speed sensor operates to provide output speed signal to the electronic hydraulic unit to distribute the hydraulic pressure upon each wheel.

16. The vehicle braking system as claimed in claim 15, wherein the pressure sensor unit operates to distribute the hydraulic pressure on each wheel to avoid the skidding or locking of the wheels thereof.

17. An electronic hydraulic unit for braking system comprising:
a) a linear electric motor;
b) a hydraulic unit driven by the electric motor;
c) a fluid reservoir unit for reserving the hydraulic braking fluid;
d) at least one inlet port connected with the fluid reservoir unit;
e) at least three outlet port for distributing the hydraulic pressure on each brake callipers;
f) a pressure sensor unit connected with each fluid lines of the outlet port;
g) a connection port for electronic control unit;
wherein the hydraulic unit is driven by the linear electronic motor upon receiving the signal from the control unit generates the hydraulic pressure to control or operate the braking.

18. The electronic hydraulic unit as claimed in claim 17, wherein the hydraulic unit comprises fluid housing having centrifugal pump to generate the hydraulic pressure.

19. The electronic hydraulic unit as claimed in claim 17, wherein the pressure sensor unit is connected with the each fluid line connected to the outlet port.

20. The electronic hydraulic unit as claimed in claim 17, wherein the inlet port is connected to the fluid reservoir unit.

21. The electronic hydraulic unit as claimed in claim 17, wherein the at least three outlet port is connected to the hydraulic lines of the brake callipers of each wheel.

22. The electronic hydraulic unit as claimed in claim 17, wherein the pressure sensor unit operates to distribute the hydraulic pressure on each wheel to avoid the skidding or locking of the wheels thereof.
, Description:FORM – 2

THE PATENTS ACT, 1970
(39 OF 1970)

&

THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
(See Section 10, Rule 13)

VEHICLE BRAKING SYSTEM;

MAHINDRA & MAHINDRA LIMITED, HAVING ADDRESS: MAHINDRA RESEARCH VALLEY, MAHINDRA WORLD CITY, 41/ 1, P.O. – ANJUR, CHENGALPATTU – 603004, DISTT. – KANCHEEPURAM, TAMIL NADU, INDIA

THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

FIELD OF THE INVENTION
The present invention relates to a vehicle braking system and more particularly to an electronically controlled hydraulic braking system of the vehicle.

BACKGROUND OF THE INVENTION
The automobile industry has always striven for achieving the mobility with higher safety standards & the easement in driving, and still continuous efforts are ongoing. In today’s life the mobility of the individual is considered as the most essential element for the purpose of travelling from home to school, work place, or to any other location of their choice.

The brakes are also the most crucial element of an automobile which functions as to control and stop the vehicle. It is known to apply brakes by through foot pedals by using mechanical linkages where the linkages apply force upon the braking assembly to stop the wheel when a force is applied upon pressing the brake pedal by user driver through his legs. However, in the mechanical linkage based braking system, applying foot pressure by the driver was observed to be very exhaustive act as it takes a lot of energy to stop the vehicle. With the advancement in the technology, the hydraulic based braking system was introduced whereby the brake pedal is connected to the master cylinder which multiplies the braking pressure through hydraulic master cylinder and applies this high braking pressure to the hydraulic cylinders of each wheel. Again, it was observed that applying brake by legs to slow or stop the vehicle is very tiresome and exhaustive job.

Moreover, in a situation of heavy traffic, the constant use of brakes are found to be the cause of foot or ankle pain or joint pain which had resulted into the surgery in many cases. There are some other devices available into the market which functions similar to the actuators for depressing the foot pedal for applying braking. However, the installation for these additional devices requires more space and time and the construction makes the braking system more complex and further the maintenance of the same is found to be costly.

Therefore, the object of the present invention is to solve one or more of aforesaid issue.
SUMMARY OF THE INVENTION
In accordance with the present invention, a vehicle braking system comprising: an input device having an accelerator lever and a braking lever for generating the braking signal; a control unit connected with the input device; an electronic hydraulic unit connected with the control unit and hydraulic cylinder of each wheel; wheel speed sensor mounted on braking assembly of each wheel and connected with the control unit wherein the control unit upon receiving the signals from the braking lever adapted to the input device operates the electronic hydraulic unit to generate hydraulic pressure and apply the hydraulic pressure on hydraulic cylinder of each wheel for controlling the braking of the vehicle.

In accordance with the present invention and electronic hydraulic unit is provided where an electronic hydraulic unit comprising; a fluid reservoir unit for reserving the hydraulic braking fluid; a linear electric motor; a hydraulic unit driven by the electric motor for generating the hydraulic pressure; at least one inlet port connected to the reservoir unit; at three outlet port for providing the braking pressure to the fluid lines of the wheels of the vehicle; a pressure sensor unit connected with the each fluid lines connected to the outlet port. The hydraulic unit comprises a centrifugal pump connected with the electric motor to generate the hydraulic pressure and the pressure sensor unit operates to distribute the hydraulic pressure on each wheel to avoid the skidding or locking of the wheels thereof.
BRIEF DESCRIPTION OF DRAWINGS:
Reference will be made to embodiments of the invention which may be illustrated in the accompanying figure(s). These figure(s) are intended to be illustrative and not limiting. Although the invention is generally described in the context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
FIG 1 shows the layout of the braking system in accordance with the present invention.
FIG 2 shows the schematic view of the electronic hydraulic unit in accordance with the present invention.
FIG 3 shows the different views of the assembly of the electronic hydraulic unit in accordance with the present invention.
FIG 4(a) and Fig 4(b) shows the potentiometer connections of the braking lever & accelerator lever of the braking system in accordance with the present invention.
FIG 5 shows the layout of the braking system in accordance with an aspect of the present invention.

DESCRIPTION OF THE INVENTION:
Although specific terms are used in the following description for sake of clarity, these terms are intended to refer only to particular structure of the invention selected for illustration in the drawings, and are not intended to define or limit the scope of the invention.

In accordance with the present invention, the issues related to the conventional braking system are solved by providing a braking system wherein the user driver operates the brakes of the vehicle by pressing the braking lever adapted on the input device through his hands.

In accordance with the present invention, a vehicle braking system comprising: an input device having an accelerator lever and a braking lever for generating the braking signal; control unit connected with the input device and an electric driving motor of the vehicle; an electronic hydraulic unit connected with the control unit and hydraulic cylinder of each wheel; a wheel speed sensor mounted on braking assembly of each wheel and connected with the control unit; wherein the control unit upon receiving the signals from input device operates the electronic hydraulic unit to generate hydraulic pressure and apply the hydraulic pressure on hydraulic cylinder of each wheel for stopping and controlling the braking of the vehicle.

In accordance with an aspect of the present invention, the input device is a hand operated lever, button or a joystick.

In accordance with another aspect of the present invention, an accelerator lever and a braking lever is adapted on the input device through variable resistor.

Referring to the Figure 1, of the present invention, a braking system of a vehicle is provided where the vehicle braking system comprising: an input device; a control unit connected with the input device and an electric driving motor of the vehicle; an electronic hydraulic unit connected with the control unit and hydraulic cylinder of each wheel; a wheel speed sensor mounted on braking assembly of each wheel and connected with the control unit. The electronic hydraulic unit is connected to the power sources which is a 12 V DC battery. The control unit is connected to the DC hub motor controller of the electric driving motor to operate the switching of the electric driving motor upon receiving the signal from the input device wherein the brake-SWT signal and brake AN signal is provided by the braking lever and accelerator lever connected to the control unit.

In accordance with an aspect of the present invention, the user driver operates the input device to provide braking signal to the control unit to operate the electric driving motor of the vehicle and further the control unit operates and controls the electronic hydraulic unit to generate the hydraulic pressure for applying brakes to the wheels of the vehicle.

Referring to the Figure 2 of the present invention, an electronic hydraulic unit comprises a fluid reservoir unit for reserving the hydraulic braking fluid; a linear electric motor; a hydraulic unit driven by the electric motor for generating the hydraulic pressure; at least one inlet port connected to the reservoir unit; at three outlet port for providing the braking pressure to the fluid lines of the wheels of the vehicle; a pressure sensor unit connected with the each fluid lines connected to the outlet port where the hydraulic unit comprises a centrifugal pump connected with the electric linear motor to generate the hydraulic pressure and the pressure sensor unit operates so as to distribute the hydraulic pressure on each wheel to avoid the skidding or locking of the wheels thereof.

Figure 3 of the present invention shows the different views of the assembly of the electronic hydraulic unit (EHU). In Fig 3(a), a front view of the assembly of the electronic hydraulic unit (EHU) is provided where a fluid reservoir unit is provided at the top of the assembly and a linear electric motor is coupled or connected to the hydraulic unit.

In figure 3(b), a side view shows three outlet ports of the electronic hydraulic unit (EHU) in which at one outlet port is provided for applying hydraulic pressure on front right brake; one outlet port is provided for applying hydraulic pressure on front left brake and one outlet port is provided for applying hydraulic pressure on the rear brakes.

Figure 3 (c) shows the isometric view of the assembly of the electronic hydraulic unit and figure 3(d) shows the another side view of the assembly of the electronic hydraulic unit wherein a connection port is provided to connect the electronic hydraulic unit (EHU) with the electronic control unit (ECU) of the vehicle.

Referring to the Figure 4 (a) of the present invention, the braking lever adapted to the input device comprises a brake switch and single potentiometer. When the braking lever is depressed, the brake switch is operated to switch off the power supply of the electric driving motor of the vehicle through DC motor controller and the potentiometer of the braking lever is operated to provide braking signal to the electronic hydraulic unit of the braking system to provide braking of the system.

Referring to the Figure 4(b), the acceleration lever adapted to the input device further comprises two potentiometers to provide signal to the control unit where one potentiometer is operated to provide ACC signal to the electric driving motor to move the vehicle and another potentiometer is operated to provide brake AN signal to reduce the revolutions per unit (rpm) of the electric driving motor of the vehicle when the accelerator lever of the vehicle is released by the user driver.

Referring to the Figure 5 of the present invention, a vehicle braking system is provided in accordance with another aspect of the present invention, the system comprising an input device having a braking lever for generating the braking signal; a control unit connected with the control unit; an electronic hydraulic unit connected with the control unit and hydraulic cylinder of each wheel; wheel speed sensors mounted on braking assembly of each wheel and connected with the pressure sensor unit of the electronic hydraulic unit wherein the control unit upon receiving the signals from the braking lever adapted to the input device operates the electronic hydraulic unit to generate hydraulic pressure and apply the hydraulic pressure on hydraulic cylinder of each wheel for controlling the braking of the vehicle by operating the brake callipers.

In accordance with an aspect of the present invention, the electronic hydraulic unit is connected to the electronic control unit of the vehicle.

The embodiments of the invention shown and discussed herein are merely illustrative of modes of application of the present invention. Reference to details in this discussion is not intended to limit the scope of the claims to these details, or to the figures used to illustrate the invention.