DESC:TECHNICAL FIELD
[001] The embodiments herein generally relate to steering systems in vehicles and more particularly, to a hydraulic power steering system (hydro-static steering system) for a vehicle, which has variable steering geometry thereby obtaining variable turning radius of the vehicle.

BACKGROUND
[002] Generally, a steering system controls directional change in the movement of a vehicle and maintain in a position as per the decision of the driver driving the vehicle. The steering system is used to convert the rotary movement of a steering wheel into angular turn of the wheels of the vehicle. The steering system in work vehicles such as tractors or other similar vehicles usually has a fixed turning radius for performing headland turning and thereby resulting in damage to agricultural fields or farm fields, where the centre of turning circle is at along a longitudinal axis of a rear steering axle of the vehicle and away from the wheels of the vehicle. Further, the aforementioned steering system has increased fuel consumption during idle headland condition, decreased productivity, higher effort and discomfort to an operator. Furthermore, when vehicles are operated by low skilled operator it leads to poor turns.
[003] Therefore, there exists a need for a steering system for a vehicle, which obviates the aforementioned drawbacks. Further, there exists a need for a steering system for a vehicle, which has variable steering geometry thereby obtaining variable turning radius of the vehicle.

OBJECTS
[004] The principal object of the embodiments of this invention is to provide a steering system for a vehicle, which has variable steering geometry thereby obtaining variable turning radius of the vehicle.
[005] Another object of the embodiments of this invention is to provide a steering system for vehicle, which facilitates easier headland operation.
[006] The 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
[007] 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:
[008] FIG. 1 depicts a schematic view of a steering system of a vehicle, according to a first embodiment of the invention as disclosed herein; and
[009] FIG. 2 depicts a schematic view of the vehicle taking a right turn along with the center of turning circle thereof, according to a first embodiment of the invention as disclosed herein.

DETAILED DESCRIPTION
[0010] 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.
[0011] The embodiments herein achieve a steering system for a vehicle, which has variable steering geometry thereby obtaining variable turning radius of the vehicle. Referring now to the drawings, and more particularly to FIG. 1 through 2, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0012] FIG. 1 depicts a schematic view of a steering system 100 of a vehicle, according to a first embodiment of the invention as disclosed herein. In the first embodiment, the steering system 100 includes a first control valve 102, a second control valve 104, a first sensor (not shown), a second sensor (not shown), a control switch (not shown), a steering cylinder C, a hydro-static steering unit H, a first hydraulic pipe P1, a second hydraulic pipe P2, a steering wheel W, a filter F, a hydraulic pump P, a reservoir R, a left front wheel L, a right front wheel R and may include other standard components as present in standard steering system.
[0013] In the first embodiment, the first control valve 102 is used to restrict the hydraulic fluid (oil) from the hydro-static steering unit H to flow to the steering cylinder C based on an information provided by the first sensor (not shown) thereby restricting the turning of the left front wheel L from the predefined angular position of the left front wheel L adapted to be detected by the first sensor (not shown), on engagement of the steering wheel W of the vehicle to steer the vehicle along a right turn. The first control valve 102 is provided in fluid communication with the hydro-static steering unit H and the steering cylinder C. The first control valve 102 is provided in communication with at least one of the first sensor (not shown) and the control switch (not shown). The first control valve 102 is connected to the first hydraulic pipe P1. The first control valve 102 is a solenoid directional control valve. It is also within the scope of the invention to provide any other types of control valves or any other means for restricting the fluid from the hydro-static steering unit H to flow to the steering cylinder C.
[0014] In the first embodiment, the second control valve 104 is used to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the information provided by the second sensor (not shown) thereby restricting the turning of the right front wheel R from the pre-defined angular position of the right front wheel R adapted to be detected by the second sensor (not shown), on engagement of the steering wheel W to steer the vehicle along a left turn. The second control valve 104 is provided in fluid communication with the hydro-static steering unit H and the steering cylinder C. The second control valve 104 is provided in communication with at least one of the second sensor (not shown) and the control switch (not shown). The second control valve 104 is connected to the second hydraulic pipe P2. The second control valve 104 is a solenoid directional control valve. It is also within the scope of the invention to provide any other types of control valves or any other means for restricting the fluid from the hydro-static steering unit H to flow to the steering cylinder C.
[0015] In the first embodiment, the first sensor (not shown) is used detect a pre-defined angular position of the left front wheel L and accordingly provides the information to the first control valve 102 when the vehicle is taking a right turn. The first sensor is adjacent to the left front wheel L. The first sensor (not shown) is provided in communication with at least one of the first control valve 102 and the control switch (not shown). The first sensor (not shown) is connected to corresponding rocker arm (not shown) of the steering system 100. In another embodiment, the first sensor (not shown) is connected to corresponding portion of a front steering axle (not shown) of the vehicle. It is also within the scope of the invention to connect the first sensor (not shown) to a steering arm or any other components of the standard steering system. In an embodiment, the first sensor (not shown) is at least one of an angle sensor and a motion sensor. It is also within the scope of the invention to provide any other type of sensors or any other means for detecting the angular position of the left front wheel L.
[0016] In the first embodiment, the second sensor (not shown) is to detect a pre-defined angular position of the right front wheel R and accordingly provides the information to the second control valve 104 when the vehicle is taking a left turn. The second sensor (not shown) is adjacent to the right front wheel R. The second sensor (not shown) is provided in communication with at least one of the second control valve 104 and the control switch (not shown). The second sensor (not shown) is connected to corresponding rocker arm (not shown) of the steering system 100. In another embodiment, the second sensor (not shown) is connected to corresponding portion of the front steering axle (not shown) of the vehicle. It is also within the scope of the invention to connect the second sensor (not shown) to a steering arm or any other components of the standard steering system. In an embodiment, the second sensor (not shown) is at least one of an angle sensor and a motion sensor. It is also within the scope of the invention to provide any other type of sensors or any other means for detecting the angular position of the right front wheel R.
[0017] The control switch (not shown) is switched on to activate/energize at least one of the first control valve 102, the second control valve 104, the first sensor (not shown) and the second sensor (not shown) to enable variable steering geometry for the vehicle thereby obtaining variable turning radius of the vehicle during right turn or left turn of the vehicle. The control switch (not shown) is mounted onto an instrument cluster (not shown) of the vehicle. The control switch (not shown) is switched off by the driver to enable the vehicle to have standard steering geometry thereby enabling reduced turning radius of the vehicle during right turn or left turn of the vehicle. The control switch is provided in communication with at least one of first control valve 102, the second control valve 104, the first sensor (not shown) and the second sensor (not shown).
[0018] The steering cylinder C is used to facilitate turning of the left front wheel L and the right front wheel R. The steering cylinder C includes a housing (not shown), a movable member (not shown), a rod (not shown) and may include other standard components as present in standard steering cylinder. The housing (not shown) of the steering cylinder C is adapted for receiving the fluid from the hydro-static steering unit through at least one of the first control valve 102 and the second control valve 104. The movable member (not shown) is adapted to move on engagement of fluid from the hydro-static steering unit through at least one of the first control valve 102 and the second control valve 104 to facilitate movement of the rod (not shown) of the steering cylinder C thereby enabling turning of the left front wheel L and the right front wheel R. In an embodiment, the movable member (not shown) can be considered to be a piston. It is also within the scope of the invention to provide any other means for movement of the rod (not shown) of the steering cylinder C. The linear movement of the rod (not shown) of the steering cylinder C is converted in angular movement of the left front wheel L and the right front wheel R.
[0019] The hydro-static steering unit H is provided in fluid communication with the steering cylinder C, the first control valve 102, the second control valve 104, the hydraulic pump P, the filter F and the reservoir R. The steering wheel W is engaged by the driver to control the directional change in the movement of the vehicle. The filter F is used for filtering the hydraulic fluid (oil) from the hydro-static steering unit H and provides the filtered hydraulic fluid to the reservoir. The filter F is provided in fluid communication with the hydro-static steering unit H and the reservoir (not shown). The hydraulic pump P is used for pumping the hydraulic fluid from the reservoir (not shown) to the hydro-static steering unit H. The hydraulic pump P is provided in fluid communication with the reservoir (not shown) and the hydro-static steering unit H. The reservoir (not shown) is used for storing the hydraulic fluid (oil). The reservoir (not shown) is provided in fluid communication with the filter F and the hydraulic pump P.
[0020] The first hydraulic pipe P1 is used for transporting the hydraulic fluid from the hydro-static steering unit H to the steering cylinder C through the first control valve 102. One end (not shown) of the first hydraulic pipe P1 is provided in fluid communication with the hydro-static steering unit H and the other end (not shown) of the first hydraulic pipe P2 is provided in fluid communication with the steering cylinder C.
[0021] The second hydraulic pipe P2 is used for transporting the hydraulic fluid from the hydro-static steering unit H to the steering cylinder C through the second control valve 104. One end (not shown) of the second hydraulic pipe P2 is provided in fluid communication with the hydro-static steering unit H and the other end (not shown) of the second hydraulic pipe P2 is provided in fluid communication with the steering cylinder C.
[0022] The working of the steering system 100 is as follows. When the driver engages the steering wheel W to steer the vehicle along a right turn, the first sensor (not shown) detects the pre-defined angular position of the left front wheel L and accordingly provides the information to the first control valve 102. Thereafter, the first control valve 102 is adapted to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the information from the first sensor (not shown) to restrict the linear movement of a rod (shaft) of the steering cylinder C thereby restricting the turning of the left front wheel L from the angular position of the left front wheel L adapted to be detected by the first sensor. The centre of turning circle G (as shown in fig. 2) is substantially between a front steering axle and a rear steering axle, and away from the wheels (left front wheel L and the right front wheel R) of the vehicle. Now, as and when the driver engages the steering wheel W to steer the vehicle along a left turn, the second sensor (not shown) detects the pre-defined angular position of the right front wheel R and accordingly provides the information to the second control valve 104. Thereafter, the second control valve 104 is adapted to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the information from the second sensor (not shown) to restrict the linear movement of the rod (shaft) of the steering cylinder C thereby restricting the turning of the right front wheel R from the angular position of the right front wheel R adapted to be detected by the second sensor. Therefore, a steering system 100 which has variable steering geometry thereby obtaining variable turning radius of the vehicle is provided for a vehicle.
[0023] In the second embodiment, the steering system 100 includes a first control valve 102, a second control valve 104, a first sensor (not shown), a second sensor (not shown), a controller unit (not shown) a control switch (not shown), a steering cylinder C, a hydro-static steering unit H, a first hydraulic pipe P1, a second hydraulic pipe P2, a steering wheel W, a filter F, a hydraulic pump P, a reservoir R, a left front wheel L, a right front wheel R and may include other standard components as present in standard steering system.
[0024] In the second embodiment, the first control valve 102 is used to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the output signal from the controller unit (not shown) thereby restricting the turning of the left front wheel L from the angular position of the left front wheel L adapted to be detected by the first sensor (not shown) which matches with the reference angular position, on engagement of the steering wheel W of the vehicle to steer the vehicle along a right turn. The first control valve 102 is provided in fluid communication with the hydro-static steering unit H and the steering cylinder C. The first control valve 102 is provided in communication with at least one of the controller unit (not shown) and the control switch (not shown). The first control valve 102 is connected to the first hydraulic pipe P1. The first control valve 102 is a solenoid directional control valve. It is also within the scope of the invention to provide any other types of control valves or any other means for restricting the fluid from the hydro-static steering unit H to flow to the steering cylinder C.
[0025] In the second embodiment, the second control valve 104 is used to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the output signal from the controller unit (not shown) thereby restricting the turning of the right front wheel R from the angular position of the right front wheel R adapted to be detected by the second sensor (not shown) which matches with the reference angular position, on engagement of the steering wheel W to steer the vehicle along a left turn. The second control valve 104 is provided in fluid communication with the hydro-static steering unit H and the steering cylinder C. The second control valve 104 is provided in communication with at least one of the controller unit (not shown) and the control switch (not shown). The second control valve 104 is connected to the second hydraulic pipe P2. The second control valve 104 is a solenoid directional control valve. It is also within the scope of the invention to provide any other types of control valves or any other means for restricting the fluid from the hydro-static steering unit H to flow to the steering cylinder C.
[0026] In the second embodiment, the first sensor (not shown) is used detect the angular position of the left front wheel L and accordingly provides the information to the controller unit (not shown) when the vehicle is taking a right turn. The first sensor (not shown) is adjacent to the left front wheel L. The first sensor (not shown) is provided in communication with at least one of the controller unit (not shown) and the control switch (not shown). The first sensor (not shown) is connected to corresponding rocker arm (not shown) of the steering system 100. In another embodiment, the first sensor (not shown) is connected to corresponding portion of a front steering axle (not shown) of the vehicle. It is also within the scope of the invention to connect the first sensor (not shown) to a steering arm or any other components of the standard steering system. In an embodiment, the first sensor (not shown) is at least one of an angle sensor and a motion sensor. It is also within the scope of the invention to provide any other type of sensors or any other means for detecting the angular position of the left front wheel L.
[0027] In the second embodiment, the second sensor (not shown) is used to detect the angular position of the right front wheel R and accordingly provides the information to the controller unit (not shown) when the vehicle is taking a left turn. The second sensor (not shown) is adjacent to the right front wheel R. The second sensor (not shown) is provided in communication with at least one of the controller unit (not shown) and the control switch (not shown). The second sensor (not shown) is connected to corresponding rocker arm (not shown) of the steering system 100. In another embodiment, the second sensor (not shown) is connected to corresponding portion of the front steering axle (not shown) of the vehicle. It is also within the scope of the invention to connect the second sensor (not shown) to a steering arm or any other components of the standard steering system. In an embodiment, the second sensor (not shown) is at least one of an angle sensor and a motion sensor. It is also within the scope of the invention to provide any other type of sensors or any other means for detecting the angular position of the right front wheel R.
[0028] In the second embodiment, the controller unit (not shown) is provided in communication with the first sensor (not shown), the second sensor (not shown), the first control valve 102 and the second control valve 104. In the second embodiment, the controller unit (not shown) compares the measured angular position with the reference angular position which is pre-set in the controller unit, based on the information provided by at least one of the first sensor (not shown) and the second sensor (not shown), and accordingly provides output signal to the first control valve 102 and the second control valve respectively, when the measured angular position is matching with the reference angular position.
[0029] The control switch (not shown) is switched on to activate/energize at least one of the first control valve 102, the second control valve 104, the first sensor (not shown) and the second sensor (not shown) to enable variable steering geometry for the vehicle thereby obtaining variable turning radius of the vehicle during right turn or left turn of the vehicle. The control switch (not shown) is mounted onto an instrument cluster (not shown) of the vehicle. The control switch (not shown) is switched off by the driver to enable the vehicle to have standard steering geometry thereby enabling reduced turning radius of the vehicle during right turn or left turn of the vehicle. The control switch is provided in communication with at least one of first control valve 102, the second control valve 104, the first sensor (not shown) and the second sensor (not shown).
[0030] The steering cylinder C is used to facilitate turning of the left front wheel L and the right front wheel R. The steering cylinder C includes a housing (not shown), a movable member (not shown), a rod (not shown) and may include other standard components as present in standard steering cylinder. The housing (not shown) of the steering cylinder C is adapted for receiving the fluid from the hydro-static steering unit through at least one of the first control valve 102 and the second control valve 104. The movable member (not shown) is adapted to move on engagement of fluid from the hydro-static steering unit through at least one of the first control valve 102 and the second control valve 104 to facilitate movement of the rod (not shown) of the steering cylinder C thereby enabling turning of the left front wheel L and the right front wheel R. In an embodiment, the movable member (not shown) can be considered to be a piston. It is also within the scope of the invention to provide any other means for movement of the rod (not shown) of the steering cylinder C. The linear movement of the rod (not shown) of the steering cylinder C is converted in angular movement of the left front wheel L and the right front wheel R.
[0031] The hydro-static steering unit H is provided in fluid communication with the steering cylinder C, the first control valve 102, the second control valve 104, the hydraulic pump P, the filter F and the reservoir R. The steering wheel W is engaged by the driver to control the directional change in the movement of the vehicle. The filter F is used for filtering the hydraulic fluid (oil) from the hydro-static steering unit H and provides the filtered hydraulic fluid to the reservoir. The filter F is provided in fluid communication with the hydro-static steering unit H and the reservoir (not shown). The hydraulic pump P is used for pumping the hydraulic fluid from the reservoir (not shown) to the hydro-static steering unit H. The hydraulic pump P is provided in fluid communication with the reservoir (not shown) and the hydro-static steering unit H. The reservoir (not shown) is used for storing the hydraulic fluid (oil). The reservoir (not shown) is provided in fluid communication with the filter F and the hydraulic pump P.
[0032] The first hydraulic pipe P1 is used for transporting the hydraulic fluid from the hydro-static steering unit H to the steering cylinder C through the first control valve 102. One end of the first hydraulic pipe P1 is provided in fluid communication with the hydro-static steering unit H and the other end (not shown) of the first hydraulic pipe P2 is provided in fluid communication with the steering cylinder C.
[0033] The second hydraulic pipe P2 is used for transporting the hydraulic fluid from the hydro-static steering unit H to the steering cylinder C through the second control valve 104. One end of the second hydraulic pipe P2 is provided in fluid communication with the hydro-static steering unit H and the other end (not shown) of the second hydraulic pipe P2 is provided in fluid communication with the steering cylinder C.
[0034] The working of the steering system 100 is as follows. When the driver engages the steering wheel W to steer the vehicle along a right turn, the first sensor (not shown) detects the angular position of the left front wheel L and accordingly provides the information to the controller unit (not shown). Thereafter, the controller unit (not shown) is configured to receive measured angular position of the left front wheel L from the first sensor (not shown) and compares the measured angular position with the reference angular position and accordingly provides output signal to the first control valve 102, when the measured angular position matching with the reference angular position. Thereafter, the first control valve 102 is adapted to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the output signal from the controller unit (not shown) to restrict the linear movement of a rod (shaft) of the steering cylinder C thereby restricting the turning of the left front wheel L from the angular position of the left front wheel L adapted to be detected by the first sensor. Now, as and when the driver engages the steering wheel W to steer the vehicle along a left turn, the second sensor (not shown) detects the angular position of the right front wheel R and accordingly provides the information to the controller unit (not shown). Thereafter, the controller unit (not shown) is configured to receive measured angular position of the right front wheel R from the second sensor (not shown) and compares the measured angular position with the reference angular position and accordingly provides output signal to the second control valve 104, when the measured angular position matching with the reference angular position. Thereafter, the second control valve 104 is adapted to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the output signal from the controller unit (not shown) to restrict the linear movement of the rod (shaft) of the steering cylinder C thereby restricting the turning of the right front wheel R from the angular position of the right front wheel R adapted to be detected by the second sensor (not shown). Therefore, a steering system 100 which has variable steering geometry thereby obtaining variable turning radius of the vehicle is provided for a vehicle.
[0035] 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 steering system 100 for a vehicle, said steering system 100 comprising:
a first control valve 102 adapted to be provided in fluid communication with a hydro-static steering unit H and a steering cylinder C;
a second control valve 104 adapted to be provided in fluid communication with the hydro-static steering unit H and the steering cylinder C;
a first sensor adapted to detect a pre-defined angular position of a left front wheel L of the vehicle and accordingly provides the information to said first control valve 102, where said first sensor is adjacent to the left front wheel L; and
a second sensor adapted to detect a pre-defined angular position of a right front wheel R of the vehicle and accordingly provides the information to said second control valve 104, where said second sensor is adjacent to the right front wheel R,
wherein
said first control valve 102 is adapted to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the information provided by said first sensor thereby restricting the turning of the left front wheel L from the predefined angular position of the left front wheel L adapted to be detected by said first sensor, on engagement of a steering wheel W of the vehicle to steer the vehicle along a right turn; and
said second control valve 104 is adapted to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the information provided by said second sensor thereby restricting the turning of the right front wheel R from the pre-defined angular position of the right front wheel R adapted to be detected by said second sensor, on engagement of the steering wheel W to steer the vehicle along a left turn.

2. The steering system 100 as claimed in claim 1, wherein said first control valve 102 is at least a solenoid directional control valve, where said first control valve 102 is connected to a first hydraulic pipe P1.

3. The steering system 100 as claimed in claim 1, wherein said second control valve 104 is at least a solenoid directional control valve, where said second control valve 104 is connected to a second hydraulic pipe P2.

4. The steering system 100 as claimed in claim 1, wherein said first sensor is at least one of an angle sensor and a motion sensor, where said first sensor is adapted to be connected to at least one of a corresponding rocker arm and a front steering axle.

5. The steering system 100 as claimed in claim 1, wherein said second sensor is at least one of an angle sensor and a motion sensor, where said second sensor is adapted to be connected to at least one of a corresponding rocker arm and a front steering axle.

6. The steering system 100 as claimed in claim 1, further comprising a control switch adapted to activate at least one of said first control valve 102, said second control valve 104, said first sensor and said second sensor.

7. The steering system 100 as claimed in claim 1, wherein a centre of turning circle G is substantially between a front steering axle and a rear steering axle, and away from the wheels (left front wheel L and the right front wheel R) of the vehicle.

8. A steering system 100 for a vehicle, said steering system 100 comprising:
a first control valve 102 adapted to be provided in fluid communication with a hydro-static steering unit H and a steering cylinder C;
a second control valve 104 adapted to be provided in fluid communication with the hydro-static steering unit H and the steering cylinder C;
a controller unit configured to be provided in communication with said first control valve 102 and said second control valve 104;
a first sensor adapted to detect the angular position of a left front wheel L of the vehicle and provides the information to said controller unit, where said first sensor is adjacent to the left front wheel L;
a second sensor adapted to detect the angular position of a right front wheel R of the vehicle and provides the information to said controller unit, where said second sensor is adjacent to the right front wheel R,
wherein
said controller unit compares the measured angular position with the reference angular position based on the information provided by at least one of said first sensor and said second sensor, and accordingly provides output signal to said first control valve 102 and said second control valve 104 respectively, when the measured angular position is matching with the reference angular position;
said first control valve 102 is adapted to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the output signal from said controller unit thereby restricting the turning of the left front wheel L from the angular position of the left front wheel L adapted to be detected by said first sensor matching with the reference angular position, on engagement of a steering wheel W of the vehicle to steer the vehicle along a right turn; and
said second control valve 104 is adapted to restrict the hydraulic fluid from the hydro-static steering unit H to flow to the steering cylinder C based on the output signal from said controller unit thereby restricting the turning of the right front wheel R from the angular position of the right front wheel R adapted to be detected by said second sensor matching with the reference angular position, on engagement of the steering wheel W to steer the vehicle along a left turn.

9. The steering system 100 as claimed in claim 8, wherein a centre of turning circle G is substantially between a front steering axle and a rear steering axle, and away from the wheels (left front wheel L and the right front wheel R) of the vehicle.

10. The steering system 100 as claimed in claim 8, further comprising a control switch adapted to activate at least one of said first control valve 102, said second control valve 104, said first sensor and said second sensor.