System and method for keeping power-assisted steering under power off state of electric vehicle

Abstract

The invention discloses a system and method for keeping power-assisted steering under a power off state of an electric vehicle. The system comprises a vehicle controller, a remote monitoring standby controller, a power battery, a steering motor controller and a steering motor. When the vehicle loses the high level suddenly or is powered off in the running process, the remote monitoring standby controller can be started for usage immediately, the remote monitoring standby controller controls the power battery to output the high level to the steering motor controller, and a control signal is sent to the steering motor controller through the remote monitoring standby controller so that the high level can be output to the steering motor through the steering motor controller, thus the steering motor can continue working and providing assistance to ensure power-assisted steering, therefore a steering wheel can rotate normally, it is ensured that the driver can have enough time to handle with an emergent situation, accidental injuries can be avoided, and meanwhile, happening of various kinds of accidents can be avoided, and operation of the electric vehicle is safer.

Description

technical field [0001] The invention relates to the field of power steering of electric vehicles, in particular to a system and method for maintaining power steering of an electric vehicle when the power is turned off. Background technique [0002] Steering system is an important safety component of a vehicle. Without power steering, the driving direction of the vehicle will be difficult to control, which is likely to cause safety accidents. The same is true for electric vehicles. Traditional fuel vehicles are divided into hydraulic steering and electric steering, while the power steering of electric vehicles They are all electric steering, and small-tonnage electric vehicles directly drive the steering pump through low-voltage electricity to achieve steering assistance. Large-tonnage electric vehicles directly drive the steering motor at a high level. [0003] The power steering of traditional large-tonnage electric vehicles (electric trucks, electric buses) generally driv...

AI Technical Summary

Problems solved by technology

[0003] The power steering of traditional large-tonnage electric vehicles (electric trucks, electric buses) generally drives the steering motor through a high level, and the steering motor controller controls the steering motor to work. Then the whole vehicle loses the high level, that is, it cannot drive the steering motor, and the whole vehicle will lose the power steering. If the high level is suddenly lost or the power is turned off during driving, the steering wheel will be difficult to control at this time. If the steering wheel is turning left, right When turning to the limit position, the steering wheel will quickly return to the right position, which may accidentally injure the driver's hand; or the vehicle may suddenly turn off and turn off due to a system failure during driving, which may cause serious safety accidents

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