Electro-hydraulic steering gear with redundancy motor for high-class automatic drive

Abstract

The invention discloses an electro-hydraulic steering gear with a redundancy motor for high-class automatic drive. The electro-hydraulic steering gear comprises a hydraulic power assisted steering gear and a double-motor servo steering device, wherein a first servo motor and a second servo motor of the double-motor servo steering device are connected in parallel and are arranged on the double-motor servo steering device; a first control unit and a second control unit are both in communication connection with a controller; a worm gear is in transmission connection with the first servo motor andthe second servo motor; the worm gear is in matching connection with an output shaft. The electro-hydraulic steering gear with the redundancy motor for high-class automatic drive meets steering function requirements of driver driving, assisted driving and unmanned driving of a vehicle, single / double motor assistance is controlled according to torque and corner information acquired by the controller, and steering functions can be successfully completed in unmanned driving / assisted driving modes. The fault tolerance of a vehicle steering system can be ensured, and the security of the system canbe improved.

Description

technical field [0001] The invention relates to the technical field of automobile steering systems, in particular to an electro-hydraulic steering gear with redundant motors for advanced automatic driving. Background technique [0002] Intelligent driving is the main direction of vehicle development in the future. In order to enable commercial vehicles to realize the functions of assisted driving and unmanned driving, the steering system also needs to be improved accordingly. At present, the steering system widely used in commercial vehicles is the traditional hydraulic power steering system, and the steering gear is a recirculating ball hydraulic power steering gear, but it has disadvantages such as fixed power ratio, poor high-speed road feeling, low energy utilization efficiency, and does not have auxiliary driving. Features. The electric power steering system uses the motor to provide steering assistance, which can overcome the above shortcomings, but the assistance it ...

AI Technical Summary

Problems solved by technology

At present, the steering system widely used in commercial vehicles is the traditional hydraulic power steering system, and the steering gear is a recirculating ball hydraulic power steering gear, but it has disadvantages such as fixed power ratio, poor high-speed road feeling, low energy utilization efficiency, and does not have auxiliary driving. Function

The electric power steering system uses the motor to provide steering assistance, which can overcome the above shortcomings, but the assistance it provides is relatively small. It is suitable for passenger cars but cannot meet the steering assistance requirements of commercial vehicles with large front axle loads.

[0003] Considering that the assisted steering or automatic steering function of the steering system is a must-have function for unmanned commercial vehicles in the future, and the serious consequences that may be caused by misoperation of the steering under unmanned driving conditions

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