Energy recovery controlling method and device for range extending electric automobile

Abstract

The embodiment of the invention provides an energy recovery controlling method and device for a range extending electric automobile. The method mainly comprises the following steps: when a range extender of the electric automobile operates, acquiring the generated output of the range extender of the electric automobile Pzc and the braking recovery power Pzd under braking or backing up sliding working conditions according to automobile speed information of the automobile; adding the generated output of the range extender Pzc and the braking recovery power Pdz to obtain precharge power Pyc; comparing the precharge power Pyc and maximal permitted charge power of a power battery Pyx; confirming current applied braking recovery power of the range extender of the electric automobile according to the comparison result. According to the invention, charge power under a range extending working mode is supervised and limited according to rated permitted charge power; when precharge power is higher than the rated permitted charge power, energy recovery is conducted by gradient limitation; normal output of the range extender power is ensured while efficiently protecting the charging power of the power battery to be within a safe range; the range extender is enabled to work in optimal operating state as far 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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