Drive-by-wire differential steering system and method for distributed driving electric vehicle

Abstract

The invention relates to a drive-by-wire differential steering system and method for a distributed driving electric vehicle. The drive-by-wire differential steering system for the distributed driving electric vehicle comprises a detection module, a drive-by-wire differential steering control module and a steering executing module, wherein the detection module is used for detecting running parameters; the drive-by-wire differential steering control module is used for obtaining target output torques of a front axle driving motor and a front axle right driving motor and transmitting a motor control signal; and the steering executing module is used for realizing differential steering of the electric vehicle. The drive-by-wire differential steering method for the distributed driving electric vehicle comprises the steps that a vehicle controller obtains the running speed of the electric vehicle; the drive-by-wire differential steering controller calculates according to a steering angle of a steering wheel and the running speed to obtain a front axle differential torque of the electric vehicle; the vehicle controller calculates to obtain a front wheel driving motor target torque; the drive-by-wire differential steering controller respectively obtains target output torques of a left front wheel and a right front wheel through calculation; and a motor controller controls a driving motor and a steering executing component to move and also controls a steering wheel aligning moment motor to output moment. Compared with the prior art, the drive-by-wire differential steering system for the distributed driving electric vehicle has the advantages of simple structure, accurate steering and so on.

Description

technical field [0001] The invention relates to the field of automobile control, in particular to a wire-controlled differential steering system and method for distributed drive electric automobiles. Background technique [0002] Distributed drive electric vehicles install the drive motor directly in or near the drive wheel, which has the characteristics of simple structure, short transmission path, and high transmission efficiency. The electric motor is not only the information unit of the car, but also the fast-response control execution unit. Since each electric wheel can be controlled independently, the dynamic state of each wheel can be effectively controlled by changing parameters such as torque and rotational speed of a single wheel motor. [0003] When the distributed drive electric vehicle is turning, in order to reduce the driver's operating force on the steering wheel (also called the steering wheel), the system that uses external power to generate steering assis...

AI Technical Summary

Problems solved by technology

At present, whether it is a hydraulic steering assist system, an electric steering assist system or a steering-by-wire steering system, it is necessary to add an assist mechanism to the steering system, which makes the system complex and costly

At the same time, the power assist mechanism will increase the inertia of the steering system

In addition, for the electric power steering system, the steering motor installed above the rack and pinion will generate a series of problems such as noise and heat dissipation

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