Vehicle power -assisted steering system and electric drive vehicle

The utility model relates to a vehicle power -assisted steering system and electric drive vehicle relates to the vehicle field, the system includes electronic power -assisted steering subsystem for when the vehicle does not appear predetermineeing fault -signal, utilize the electric energy that the power battery of vehicle provided provides power -assisted steering, it instructs to predetermine fault -signal power battery with electric connection between the electronic power -assisted steering subsystem need be broken off, pneumatic power -assisted steering subsystem is used for the vehicle appears when presetting fault -signal, do not utilizing provide power -assisted steering under the condition of the electric energy that power battery provided. This system can both provide power -assisted steering for the vehicle when the vehicle normally supplies the high -tension electricity with the disconnection high -tension electricity to in the lower time of abnormal conditions that the vehicle appearance needs to