Control method and device of electric vehicle and electric vehicle

Abstract

The invention discloses a control method and device of an electric vehicle and the electric vehicle. The method comprises the following steps: acquiring a demand driving power parameter of a motor, a consumption power parameter of a vehicle-mounted electric appliance and a discharge power parameter of a power battery; determining whether the electric vehicle is in a power output abnormal state or not according to the relationship among the demand driving power parameter, the consumption power parameter and the discharge power parameter; if yes, electric connection between the power battery and the motor is cut off, power transmission can still be cut off when the motor breaks down and is not controlled, namely power supply of the motor is cut off, and therefore the motor loses the power output capacity, harm caused by unexpected acceleration of the electric vehicle is avoided, the physical structure of the electric vehicle is not changed, and the service life of the electric vehicle is prolonged. And therefore, extra cost is not increased.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of electric vehicles, and in particular, to a control method and device for an electric vehicle, and an electric vehicle. Background technique [0002] With the promotion of new energy vehicles, the market share is increasing year by year, and the proportion of traffic accidents is also increasing year by year. In view of the difference in power transmission structure between new energy vehicles and traditional fuel vehicles: 1) Traditional vehicles have gearbox clutches , which can cut off the power connection between the engine and the wheel, while the motor of the new energy vehicle is directly connected to the wheel; 2) The torque power of the traditional vehicle engine is generally not large, and the acceleration time of the whole vehicle is generally about 8s. For low-speed and high-torque, the vehicle's acceleration time to 100 kilometers easily enters 5s. Accidental acceleratio...

AI Technical Summary

Problems solved by technology

Unexpected acceleration of new energy vehicles will cause more serious consequences, and the effective measures that drivers can take are less than those of traditional vehicles. For new energy vehicles, the driver cannot physically disconnect the power transmission between the motor and the wheels except for deceleration by stepping on the brakes.

[0003] Most of the current new energy vehicles use the vehicle controller to control the motor controller to output the corresponding torque to the wheels, so as to achieve the purpose of driving the vehicle. However, when the motor fails, this path will fail, and it can only be decelerated by stepping on the brakes. Failure to meet safety requirements for electric vehicles

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