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
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[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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