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Cam type assistance-adjustable hydraulic power-assisted steering system and control method thereof

A technology of hydraulic power steering and hydraulic power assist, applied in the direction of fluid steering mechanism, etc., can solve the problems of large battery load, floating, and insufficient portability, and achieve the effects of less power, simple structure, and little impact on service life.

Active Publication Date: 2012-05-09
ZHEJIANG GEELY HLDG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a hydraulic power steering system and a control method thereof with adjustable power assist of a cam type that can be adjusted according to needs and consumes less power. The problem of insufficient portability when steering and the electronic hydraulic power assist system will cause a large load on the vehicle battery

Method used

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  • Cam type assistance-adjustable hydraulic power-assisted steering system and control method thereof
  • Cam type assistance-adjustable hydraulic power-assisted steering system and control method thereof
  • Cam type assistance-adjustable hydraulic power-assisted steering system and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1, see figure 1 , A cam type power assist adjustable hydraulic power steering system, including a steering pump 3, a reservoir 2, a hydraulic power steering gear 1, a power regulator 4, a vehicle speed sensor 5, a pressure sensor 6, a control unit 7 and a stepping motor 8. The vehicle speed sensor 5, the pressure sensor 6 and the stepping motor 8 are electrically connected to the control unit 7.

[0037] The control unit 7 is the ECU of the car itself.

[0038] The stepping motor 8 is a stepping motor with a locking function. No need to design a locking structure separately, simplifying the overall structure.

[0039] The steering pump 3 is a single-acting vane pump. The steering pump 3 is driven by the engine 9. The steering pump inlet 31 is connected with the outlet 21 of the storage tank through a pipeline, and the inlet 22 of the storage tank is connected with the outlet 11 of the hydraulic power steering device through a pipeline. The pump outlet 32 ​​and the ...

Embodiment 2

[0051] Example two, see Figure 5 , The difference from the first embodiment is the boost regulator 4.

[0052] The booster regulator 4 includes a cylinder 42, a piston 43 and a cam 44 matched with the cylinder. The cam 44 is an eccentric wheel. The piston 43 and the cylinder 42 form a variable volume space 45, and the boost regulator port 41 is used to communicate the variable volume space 45 with the outer space of the cylinder 42. A piston rod 46 is provided on the piston 43. The cross section of the piston rod 46 is smaller than the cross section of the piston 43, and the piston rod 46 and the piston 43 are welded together. A support ring 421 is provided on the right end of the cylinder 42. The support ring 421 is connected to the cylinder 42 by bolts. The diameter of the inner hole of the support ring 421 is the same as the diameter of the piston rod 46. The right end of the piston rod 46 penetrates the right end of the cylinder 42 and is hinged to the left end of the c...

Embodiment 3

[0055] Example three, see Figure 8 The difference in mechanical structure from the second embodiment is that the connecting rod 10 includes a piston rod connector 105, a double-ended screw 103 and a cam connector 104. The piston rod connector 105 and the cam connector 104 are respectively provided with The threaded holes matched with the double-headed screw, both ends of the double-headed screw 103 are threadedly connected to the threaded hole of the piston rod connector 105 and the threaded hole of the cam connector 104, and the ring 101 is arranged on the cam connector 104. The ring 101 and the cam connector 104 are an integral structure. The length of the connecting rod 10 is changed by changing the depth of the double-headed screw 103 screwed into the piston rod connector 105 or the cam connector 104 to realize the change of the starting and ending positions of the piston in the cylinder 42.

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Abstract

The invention relates to a hydraulic power-assisted steering system, in particular to a cam type assistance-adjustable hydraulic power-assisted steering system, which comprises a steering pump, a liquid storage tank, a hydraulic power-assisted steering gear, a vehicle speed sensor, a control unit, a pressure sensor, an assistance adjustor and a stepping motor for driving the assistance adjustor. An outlet of the hydraulic power-assisted steering gear is communicated with the liquid storage tank, and the assistance adjustor further comprises a cylinder block, a piston and a cam which is used for converting rotation of the stepping motor into linear motion, and the control unit is used for controlling the steeping motor according to input signals of the vehicle speed sensor and the pressuresensor. The cam type assistance-adjustable hydraulic power-assisted steering system and the control method thereof have the advantages that assistance can be adjusted according to needs, energy consumption is low, and the problems that existing hydraulic power-assisted steering systems are unstable in high-speed steering and insufficient in portability in low-speed steering and the problem of high load of vehicular accumulators in electronic hydraulic power-assisted steering systems are solved.

Description

technical field [0001] The invention relates to a hydraulic power steering system, in particular to a hydraulic power steering system with adjustable cam type power assist and a control method thereof. Background technique [0002] A series of devices used to change or maintain a car's direction of travel or reverse is called a car steering system. The function of the car steering system is to control the driving direction of the car according to the driver's wishes. The car steering system is very important to the driving safety of the car, so the parts of the car steering system are called security parts. The earliest steering system developed was the mechanical steering system. The mechanical steering system uses the driver's physical strength as the steering energy, and all the power transmission parts are mechanical. When the steering load is large, it is difficult to steer smoothly and the manipulation is laborious only by the driver's physical strength as the steer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/065
Inventor 郝晓宏许俊余卫
Owner ZHEJIANG GEELY HLDG GRP CO LTD
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