A by-wire directional mechanical redundancy device

Abstract

The application provides a drive-by-wire direction mechanical redundancy device, and relates to the technical field of automobile steering systems.The drive-by-wire direction mechanical redundancy device comprises a steering wheel, a transmission shaft, a soft direction connecting rod and a direction machine execution mechanism.The drive-by-wire direction mechanical redundancy device adopts a double safety architecture of electronic drive-by-wire and mechanical backup.When normally working, an electric control valve is opened, a pressure medium pushes a piston upward to lift a connecting sleeve, the spring elastic force is overcome to separate the connecting sleeve from the spline of a lower cover, the mechanical connection between the transmission shaft and the soft direction connecting rod is released, the system enters a pure drive-by-wire steering mode, the steering wheel remains stationary during automatic driving and cannot rotate with the steering machine, and the driving experience is improved.When the drive-by-wire system fails, is powered off or the vehicle is in a collision, the electric control valve is immediately closed, the pressure is released, the spring quickly pushes the connecting sleeve to move downward, the spline is re-engaged, the mechanical hard connection is restored, and the driver can directly control the vehicle steering through the steering wheel, so that the risk of steering failure caused by the failure of the electronic system is completely eliminated.

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