Energy recovery control method and device for extended-range electric vehicles

Abstract

The present invention provides an energy recovery control method and device for a range-extended electric vehicle. The method mainly includes: when the range extender of the electric vehicle is working, according to the vehicle speed information of the vehicle, the power generation power Pzc of the range extender of the electric vehicle is obtained, Braking regenerative power Pzd under braking or back-drag coasting conditions; add the power generated by the range extender Pzc and braking regenerative power Pzd to obtain the pre-charging power Pyc, and combine the pre-charging power Pyc with the maximum allowable charging power of the power battery Pyx comparison, according to the comparison result, determines the braking power currently used by the range extender of the electric vehicle. The embodiment of the present invention can supervise and limit the charging power in the extended range working mode according to the rated allowable charging power. While within the safe range, make the range extender work as best as possible.

Description

technical field [0001] The invention relates to the technical field of energy recovery of electric vehicles, in particular to an energy recovery control method and device for an extended-range electric vehicle. Background technique [0002] In order to improve the energy utilization rate of the whole vehicle, electric vehicles usually use braking energy recovery technology. During the process of vehicle deceleration, coasting and braking, the driving motor of the electric vehicle is switched to the power generation state, and part of the kinetic energy of the vehicle is converted into electric energy and fed back to the power. battery, so as to achieve braking and energy recovery and reuse. In the range-extended electric vehicle, the range extender will be mainly used for power generation to supplement the power of the power battery and effectively increase the cruising range. In the case of different temperatures and different SOC (State of Charge, state of charge), the ba...

AI Technical Summary

Problems solved by technology

[0003] In the existing range-extended electric vehicles, when the range extender is performing power generation processing, if the vehicle coasts or brakes at the same time, the braking energy cannot be effectively recovered, which has obvious limitations

When the braking energy is recovered, the charging power will be too high, and the working state of the range extender will be changed when the charging power is limited.

However, the NVH performance of the whole vehicle such as the vibration and noise of the range extender of the two-cylinder engine is poor. When the working condition of the range extender is changed, it will cause vibration in the vehicle power compartment and affect driving comfort.

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