Method and device for estimating driving mileage of electric vehicles

Abstract

The invention discloses a method and a device for estimating the driving mileage of electric vehicles.The method includes determining initial driving mileage of the electric vehicles by the aid of vehicle control units according to current battery states of charge (SOC) of power batteries when the electric vehicles are started; acquiring battery parameters of the power batteries and vehicle speeds in real time by the aid of the vehicle control units after the electric vehicles are started, determining the average electricity consumption E and current residual energy E<S> of the batteries within the recent preset time periods T according to preset update intervals, the battery parameters and the vehicle speeds and determining the real-time driving mileage S<x> of the electric vehicles according to the E and the E<S>; storing the current driving mileage S<x> by the aid of the vehicle control units when the electric vehicles are parked and powered off.The battery parameters include voltages, currents and the SOC.The method and the device have the advantage that the estimation accuracy of the driving mileage of the electric vehicles can be effectively improved by the aid of the method and the device.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and device for estimating the mileage of an electric vehicle. Background technique [0002] At present, with the increasingly serious energy crisis and environmental problems, the country is increasingly promoting electric vehicles. The driving range has always been a key factor affecting the further promotion of electric vehicles. The driving range refers to the continuous driving range of an electric vehicle under certain road conditions after the battery is fully charged. Real-time mileage, that is, the mileage supported by the current on-board battery power, will directly affect the driver's judgment on the state of the vehicle, and is directly related to whether the vehicle can drive to the destination according to the driver's expectations. [0003] In the existing estimation scheme of real-time mileage, the power consumption per unit distance is calculated b...

AI Technical Summary

Problems solved by technology

[0004] In the above scheme, the entire driving process is regarded as the same state to calculate the driving mileage, but in practical applications, the power consumption is different under different road conditions. Therefore, the above scheme cannot estimate the driving mileage based on the actual driving process. , so the resulting estimate will not match the actual range

[0005] It can be seen that the existing real-time mileage estimation scheme has the problem of low accuracy

Images