A control method of an electrohydraulic power steering system

A technology of hydraulic power steering and control method, which is applied in the direction of power steering mechanism, steering mechanism, fluid steering mechanism, etc., which can solve the problems of poor emergency control effect and achieve the effect of improving effect, good effect and improving efficiency

Active Publication Date: 2020-11-27
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects and problems of poor emergency control effect existing in the prior art, and to provide a control method for electrohydraulic power steering system with better emergency control effect

Method used

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  • A control method of an electrohydraulic power steering system
  • A control method of an electrohydraulic power steering system
  • A control method of an electrohydraulic power steering system

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Experimental program
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Effect test

Embodiment 1

[0067] see Figure 1 to Figure 7 , a control method of an electro-hydraulic power steering system, the electro-hydraulic power steering system includes a motor 4, a high-voltage controller 6, a low-voltage controller 7 and a vehicle CAN bus 10, the motor 4 includes a motor stator 42, a high-voltage motor The rotor 43 and the low-voltage motor rotor 44, the high-voltage motor rotor 43, and the low-voltage motor rotor 44 share a motor stator 42. The high-voltage motor rotor 43 is electrically connected to the high-voltage power supply 8 through the high-voltage controller 6. The controller 7 is electrically connected to the low-voltage power supply 9, and the high-voltage controller 6 is connected to the CAN bus 10 of the vehicle through a high-voltage signal line 61. The vehicle CAN bus 10 is used for signal connection;

[0068] The control method includes a normal communication strategy, and the judging standard of normal communication is that the signal transmission between ...

Embodiment 2

[0072] Basic content is the same as embodiment 1, the difference is:

[0073] The working time of the low-voltage motor rotor 44 includes the shortest working time and the longest working time, wherein, within the shortest working time, the low-voltage controller 7 controls the low-voltage motor rotor 44 to run continuously, and outside the longest working time, the low-voltage controller 7 7 then control the low-voltage motor rotor 44 to stop running (can stop automatically). When the low-voltage motor rotor 44 is in the shortest working time, if the vehicle speed drops to a certain value, the low-voltage controller 7 controls the low-voltage motor rotor 44 to stop running. When the low-voltage motor rotor 44 works between the shortest working time and the longest working time, the driving motor of the whole vehicle will run with reduced power.

Embodiment 3

[0075] Basic content is the same as embodiment 1, the difference is:

[0076] The electro-hydraulic power steering system includes an oil pump 3, a motor 4, an integrated casing 5, a high pressure controller 6 and a low pressure controller 7, the input shaft of the oil pump 3 is connected to the output shaft of the motor 4, and the oil pump 3 is provided with a pump The oil inlet 31 and the pump oil outlet 32, the integrated housing 5 includes a housing 51 and a housing cavity 52 provided inside, one end of the housing 51 is connected with the body 41 of the motor 4, and the other end of the housing 51 One end is provided with a signal interface 53, a high-voltage power supply interface 54, and a low-voltage power supply interface 55, and a low-voltage controller 7 is arranged in the shell cavity 52; After the high-voltage external connection line 541 and the high-voltage controller 6 are electrically connected to the high-voltage power supply 8, the low-voltage motor rotor 44...

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PUM

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Abstract

A control method for an electro-hydraulic power-assisted steering system includes mutual signal transmission between high-voltage and low-voltage controllers and a vehicle CAN bus. On this basis, whenthe vehicle CAN bus sends a steering demand signal and a signal transmitted from the low-voltage controller to the vehicle CAN bus reflects that the speed of the motor is reduced to the switching speed, the vehicle CAN bus stops a high-voltage power supply from supplying power to a high-voltage motor rotor by the high-voltage controller, and turns on a circuit between a low-voltage power supply and a low-voltage motor rotor by the low-voltage controller, in order that the low-voltage power supply supplies power to the low-voltage motor rotor through the low-voltage controller. The low-voltagecontroller converts the DC power provided by the low-voltage power supply into AC power, and the low-voltage motor rotor starts to work. Such design not only has a good emergency control effect, butalso achieves high driving safety.

Description

technical field [0001] The invention relates to a control strategy of a steering system, which belongs to the technical field of automobile steering systems, in particular to a control method of an electrohydraulic power steering system, and is particularly suitable for enhancing the effect of emergency control. Background technique [0002] Electro-hydraulic power steering system, referred to as EHPS system, is often used in the steering system of various electric vehicles. This system generally uses a single-source electric steering oil pump assembly, which has the following disadvantages: [0003] When there is a problem with the wiring harness or high-voltage control method between the high-voltage power battery of the vehicle and the single-source electric steering oil pump, the single-source electric steering oil pump assembly will stop working or appear abnormal phenomena, which will affect the steering function of normal driving and even cause traffic accident. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62D5/06
CPCB62D5/064
Inventor 宁忠翼杨小见杨胜
Owner DONGFENG COMML VEHICLE CO LTD
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