State of charge (SOC) trajectory planting system and control method of range extending type electric car

Abstract

The invention relates to an state of charge (SOC) trajectory planting system and control method of a range extending type electric car and aims to solve the problems that a current range extending type electric car in a low SOC state is insufficient in power performance during high-speed driving or slope climbing, and the driving experience of a driver is affected. The hardware of the system comprises a vehicular navigation system, a driver power performance expectation input button and a whole-car control system. The software of the system comprises a multi-mode SOC trajectory planning module, an energy management control module and a range extender dynamic coordination control module. The multimode SOC trajectory planning module automatically judges and switches the working modes of the electric car and plans the SOC trajectories under various modes according to the car power performance expectation input by a driver through the button and simple geographic and work condition information provided by the vehicular navigation system; the energy management control module controls the power distribution between a range extender and a power battery so as to allow the actual SOC of the power battery to accurately track the planned SOC, and efficient work of a hybrid power system is guaranteed.

Description

technical field [0001] The invention relates to an electric vehicle energy management and control technology, in particular to a power trajectory planning system and control method for an extended-range electric vehicle. Background technique [0002] By adding a small range extender as an auxiliary energy source on the basis of a pure electric vehicle, the range-extended electric vehicle effectively extends the driving range of the electric vehicle and eliminates the driver's "range anxiety". The type of new energy vehicles in the foreground. The energy management control of extended-range electric vehicles usually adopts the strategy of power consumption-power maintenance (CD-CS): first control the vehicle to run in pure electric mode, when the actual power of the power battery (SoC, the full name is State of Charge, also called state of charge, also called When the remaining power) drops to a certain limit, the vehicle is controlled to enter the range-extender mode, and t...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the deficiencies of the above-mentioned prior art, and on the basis of comprehensively considering the driver's power performance expectation, the pure electric mileage of the vehicle, and the future simple geographic and road condition information provided by the vehicle navigation system, it aims to propose an engineering A multi-mode discharge trajectory planning system and control method for extended-range electric vehicles with high energy utilization efficiency, which is practical and efficient, to solve the problem of insufficient power performance and poor driving experience of current extended-range electric vehicles when driving at high speeds and climbing hills in the power maintenance mode The problem

Images