Variable-transmission-ratio electric steering system of commercial vehicle and control method of variable-transmission-ratio electric steering system

Abstract

The invention discloses a commercial vehicle variable-transmission-ratio electric steering system and a control method of the variable-transmission-ratio electric steering system. The variable-transmission-ratio electric steering system comprises a steering wheel module, a variable-transmission-ratio transmission module, a double-winding motor power assisting module and a main controller module. According to the invention, a harmonic gear mechanism drives a circulating ball type steering gear to achieve the variable transmission ratio function, the transmission ratio range is large, the bearing capacity is high, the transmission is stable, and the precision is high; and meanwhile, the working modes of the motor can be accurately switched according to the transmission ratio of the steering system under different working conditions, the active safety of the vehicle is enhanced, the requirements for steering sensitivity during low-speed driving and steering stability during high-speed driving of the vehicle are both considered, and the characteristics of large transmission ratio and large torque needed by a commercial vehicle are met at the same time.

Description

technical field [0001] The invention belongs to the technical field of automobile steering systems, and in particular relates to a commercial vehicle variable transmission ratio electric steering system and a control method thereof. Background technique [0002] At present, the existing commercial vehicle electric steering system only provides variable power assistance according to the driver's intention to reduce the driver's steering burden; it cannot realize active correction control according to the requirements of the vehicle's operating conditions for handling stability. The angular transmission ratio from the steering wheel to the front wheels of the existing commercial vehicle electric steering system is generally approximately a fixed value. When steering at low speeds, the driver's steering force is large, and the steering feel and comfort are poor; when steering at high speeds, the driver The operation reaction time of the vehicle is short, and the mass inertia of...

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Problems solved by technology

[0005] In view of the deficiencies in the prior art above, the purpose of the present invention is to provide a commercial vehicle variable transmission ratio electric steering system and its control method to solve the problem that the commercial vehicle steering system in the prior art cannot meet the use requirements, safety and The problem of poor stability; the present invention can improve the steering quality of the steering system and the steering stability of the vehicle according to the vehicle speed, steering wheel angle, and vehicle stability state signal, and provide larger steering torque and faster response speed

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