Multi-mode motor-driven steer-by-wire system of passenger vehicle and steering control method thereof

Abstract

The invention discloses a multi-mode motor-driven steer-by-wire system of a passenger vehicle and a steering control method of the multi-mode motor-driven steer-by-wire system. The system is composedof a steering wheel unit, an electronic control unit and a steering execution unit. A road feeling simulation assembly is arranged in the steering wheel unit to realize the road feeling simulation, the steering wheel unit is connected with the steering execution unit through a torque transmission mechanism, and a double-transmission-shaft structure is adopted in the steering execution unit to achieve the steering independent control of the wheels at the left side and the right side. All electric elements in the steering wheel unit and the steering execution unit are in signal connection with the electronic control unit so as to collect the state signals of the steering system and send the control signals to the electric control elements. According to the steering control method, under thecorresponding motor failure state, the corresponding electromagnetic clutches are controlled to be separated or combined through the ECU, and then the steering torque transmission is controlled. According to the invention, the vehicle can still smoothly complete the steering action under the condition that the electrical elements of the system fail, and the safety of the steering system is greatlyimproved.

Description

technical field [0001] The invention belongs to the technical field of vehicle steering-by-wire, and in particular relates to a multi-mode motor-driven steering-by-wire system and a steering control method for a passenger car. Background technique [0002] Nowadays, control-by-wire technology is becoming more and more popular, and its application in the field of vehicle steering control technology is becoming more and more extensive. Among them, the most widely used vehicle steering systems include: "power steering system by wire" and "steering by wire system". [0003] The control unit of the "power-by-wire steering system" can perceive the driver's steering intention and the real-time status of the vehicle according to the multi-sensor signals, and issue instructions to control the power-assist motor to provide appropriate assistance to the driver's steering operation. The connection can realize the road feeling feedback to the driver. [0004] The "steering-by-wire syst...

AI Technical Summary

Problems solved by technology

[0005] However, both the power steering system and the steering-by-wire system have the risk of failure of electrical components. If there is no backup structure in the system, the steering behavior will not be completed, and relying on mechanical steering will increase the steering operation of the driver. , Stability requirements increase the difficulty of driving, which in turn affects the safety of the entire steering system

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