Car driving power control method and device, car controller and car

Abstract

The invention discloses a car driving power control method and device, a car controller and a car. The car driving power control method comprises the steps that the current battery temperature of the electric car is detected; if the battery temperature is greater than the first preset temperature and less than the second preset temperature and the current car situation of the electric car meets second car situation conditions, the output torque of a car-mounted motor is limited according to a peak torque limit factor; and if the battery temperature is greater than the first preset temperature and less than the second preset temperature and the current car situation of the electric car meets third car situation conditions, the step that current driving operation is responded according to the maximum output power or the output torque of the car-mounted motor is limited according to the peak torque limit factor is selected according to a hysteresis control curve. According to the car driving power control method, the driving demand is effectively met while the battery temperature is prevented from exceeding a temperature overtemperature protection value, affecting of the user using experience is avoided, and the safety and reliability of the car are effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a method and device for controlling driving power of the vehicle, a vehicle controller and a vehicle. Background technique [0002] In related technologies, electric vehicles generally use an independent thermal management controller to control the thermal management of the battery system. Among them, the thermal management controller can formulate a control strategy according to the state of the battery itself. The way of output power reduces the battery temperature. [0003] However, in the related art, there are the following problems in vehicle operation: [0004] ① After the vehicle runs for a period of time under extreme conditions, as the battery temperature exceeds the battery overtemperature point, the battery will quickly limit the available output power, resulting in obvious fluctuations in vehicle speed and reducing the vehicle experience. [0005] ②After ...

AI Technical Summary

Problems solved by technology

[0004] ① After the vehicle has been running for a period of time under extreme conditions, as the battery temperature exceeds the battery overtemperature point, the battery will quickly limit the available output power, resulting in obvious fluctuations in vehicle speed and reducing the vehicle experience

[0005] ② After the battery temperature exceeds the battery over-temperature point, due to the limited output power, the acceleration process of the vehicle after deceleration will be very slow, which cannot effectively meet the use requirements

[0006] ③The hysteresis control after the battery temperature exceeds the battery over-temperature point will cause obvious fluctuations in the available output power of the battery, which is prone to unexpected acceleration, reducing the safety and reliability of the vehicle

[0007] Therefore, the applicability of the thermal management controller to design a control strategy only for the state of the battery itself is low, which not only reduces the user experience, cannot effectively meet the driving needs, but also reduces the safety and reliability of the vehicle, which needs to be solved urgently

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