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Control method and system for electric hydraulic power steering under low-temperature working condition

A technology of hydraulic power steering and control method, which is applied in the direction of electric steering mechanism, power steering mechanism, steering mechanism, etc. It can solve the problems of long warm-up time and the inability to start the vehicle quickly, and achieve the effect of improving activity

Inactive Publication Date: 2020-02-21
ZHENGZHOU YUTONG BUS CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a control method and system for electro-hydraulic power steering under low temperature conditions, so as to solve the problem that when the temperature is low, the warm-up time is long, and the vehicle equipped with EHPS cannot be started quickly

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  • Control method and system for electric hydraulic power steering under low-temperature working condition
  • Control method and system for electric hydraulic power steering under low-temperature working condition

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Embodiment Construction

[0018] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] The basic principle of the present invention is:

[0020] At startup, the steering motor is controlled to run at a first frequency higher than the rated frequency within a preset time, and after a preset time related to the ambient temperature, the steering motor is operated at a reduced frequency. When the electric power steering oil pump is started each time, the steering motor runs at a speed higher than the rated speed for a period of time to effectively circulate the hydraulic oil of the steering oil circuit, improve its activity, and preheat the steering hydraulic system. This solves the problem that when the temperature is low, the preheating time is long, and the vehicle equipped with EHPS cannot start quickly.

[0021] specific:

[002...

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Abstract

The invention relates to a control method and system for electric hydraulic power steering under a low-temperature working condition. The system comprises a processor and a memory, wherein the processor executes a program instruction stored in the memory to realize the following steps of during startup, controlling a steering motor to operate at first frequency higher than rated frequency in preset time; and after preset time related to an environment temperature, lowering the frequency of the steering motor to operate. When an electric hydraulic power steering oil pump is started each time, the steering motor operates for a period of time at a speed higher than a rated revolving speed, the hydraulic oil of a steering oil circuit effectively circulates to improve the activity of the hydraulic oil, and a steering hydraulic system is preheated. Therefore, a problem that a vehicle provided with an EHPS (electric hydraulic power steering) can not be quickly started since preheating time islong when a temperature is low can be solved.

Description

Technical field [0001] The invention relates to the technical field of vehicle power steering, in particular to a control method and system for electro-hydraulic power steering under low-temperature working conditions. Background technique [0002] The electric hydraulic power steering system, EHPS for short, uses a steering motor and a controller to drive the steering oil pump (electric steering oil pump for short), and directly assists the vehicle through the hydraulic energy provided by the steering oil pump. It is widely used in new energy vehicles, especially pure electric vehicles and deep hybrid vehicles. However, the current EHPS has the following characteristics: Since the vehicle has no engine, the electric steering oil pump and hydraulic system cannot be preheated by the waste heat of the engine, resulting in a relatively high viscosity of the hydraulic steering oil and a poor electric steering oil pump system when the temperature in the cold zone is low. , The workin...

Claims

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Application Information

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IPC IPC(8): B62D5/04
CPCB62D5/0457
Inventor 陈运来闫帅林孟天宝
Owner ZHENGZHOU YUTONG BUS CO LTD
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