Pure electric vehicle driving range system based on double ampere-hour integral, and calculation method

Abstract

The invention relates to a pure electric vehicle driving range system based on double ampere-hour integral, and a calculation method of the pure electric vehicle driving range system. The pure electric vehicle driving range system comprises a vehicle body, wherein the vehicle body is provided with an online adjustment model parameter module, an equivalent circuit model module, a self-adaptive EKF residual electric quantity estimation module, an ampere-hour integral residual electric quantity module, a residual electric quantity output selector module and a remaining mileage calculation module, the online adjustment model parameter module is in data connection with the equivalent circuit model module, the equivalent circuit model module is in data connection with the self-adaptive EKF residual electric quantity estimation module, the online adjustment model parameter module inputs adjustment parameters to an equivalent circuit model, the self-adaptive EKF residual electric quantity estimation module calculates based on the equivalent circuit model module, and the remaining mileage calculation module calculates based on the residual electric quantity output selector module. The pure electric vehicle driving range system and the calculation method thereof adopt two kinds of ampere-hour integral methods including charge-discharge efficiency, calculate residual electric quantity of a power battery parallelly, select and output the current residual electric quantity in an intelligent manner, and further improve the estimation precision.

Description

technical field [0001] The invention relates to pure electric vehicle control technology, in particular to a pure electric vehicle mileage system based on dual-ampere-hour integration. Background technique [0002] Electric vehicles have become the focus and focus of global development. In particular, pure electric vehicles have developed rapidly under the encouragement of national testing policies. Since the pure electric vehicle has only one power source, the battery pack, and because the battery itself is an extremely complex nonlinear system, its state is particularly difficult to estimate accurately in real time, which leads to inaccurate estimation of the remaining power and seriously affects the continuous operation of the vehicle Therefore, it is necessary to invent an accurate battery remaining power estimation system and estimation method. The prediction methods of the remaining battery power that are mainly used today mainly include: discharge test method, inter...

AI Technical Summary

Problems solved by technology

The ampere-hour integration method is the most widely used method today, but it also has some shortcomings: because it is an open-loop algorithm, its errors will continue to accumulate, it cannot estimate the charge and discharge efficiency, and it cannot estimate the initial remaining power value

This method considers few factors, and the calculation method used will cause the displayed remaining driving range of the electric vehicle to change up and down due to the rapid change of the current i value, and finally the value of the remaining driving range of the electric vehicle is not credible

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