Dual-motor electric power steering system and power steering method thereof

Abstract

The invention discloses a dual-motor electric power steering system and a power steering method thereof. In the system, a first steering shaft is connected below the steering wheel, and the first steering shaft is connected to a second steering shaft through a universal joint; the steering wheel torque angle sensor is set Under the steering wheel, it is used to collect the torque and rotation angle signals of the steering wheel in real time; the first booster motor and the second booster motor are connected in parallel through the first torque coupler, and the first torque coupler is connected between the second booster motor and the first torque coupler. An electromagnetic clutch; the output end of the torque coupling is connected in parallel with the second steering shaft through the second torque coupling; the output end of the second torque coupling is connected to the steering gear through the third steering shaft. The present invention sets two booster motors connected through a torque coupler, and controls a single booster motor or two booster motors to output torque at the same time according to the size of the required booster torque, so as to meet the needs of business travelers who need relatively large torque , and improve the fuel economy of commercial vehicles and reduce operating costs.

Description

[0001] 【Technical field】 [0002] The invention relates to a steering system, in particular to an electric power steering system and a power steering method thereof. [0003] 【Background technique】 [0004] The existing electric power steering system is safe and reliable, and the steering characteristic curve is ideal. At the same time, due to the use of a DC motor, the engine does not need to provide high-pressure oil, and the fuel economy of the whole vehicle is good. However, limited by the battery power supply voltage and installation size of automobiles, the output torque of electric power steering is relatively small, which cannot meet the requirements of commercial vehicle steering assistance. At present, the application field is still limited to passenger cars or light commercial vehicles. Therefore, from the perspective of fuel economy, the use of electric power steering system with large output torque has positive significance for improving the fuel economy of commer...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a dual-motor electric power steering system and its power steering method to solve the problem that the electric power steering output torque is too small to meet the application on commercial vehicles

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