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

An electric vehicle and energy recovery technology, applied in electric vehicles, control drive, transportation and packaging, etc., can solve the problems of vehicle power cabin vibration, high charging power, affecting driving comfort, etc., to ensure normal output and improve charging efficiency. Effect

Active Publication Date: 2017-09-15
BEIJING ELECTRIC VEHICLE
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  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Embodiment 1

[0044] In the embodiment of the present invention, braking energy recovery control is added to the extended-range electric vehicle. The NVH performance of the whole vehicle such as the vibration and noise of the range extender is poor. When limiting the braking energy recovery, first limit the braking energy recovery to ensure the stable operation of the range extender.

[0045] The braking energy recovery control strategy in the embodiment of the present invention consists of figure 1 The multiple controllers shown are coordinated together, and the main controller is the range extender controller. Among them, the main function of the vehicle controller, ABS (Anti-lock Braking System, anti-lock braking system), and battery controller is to provide the range extender controller with the required signal for control. After being processed by the range extender controller, the control quantity (capacity recovery command and motor output torque) is sent to the motor for capacity r...

Embodiment 2

[0065] This embodiment provides an energy recovery control device for an extended-range electric vehicle, and its specific structure is as follows: Figure 4 As shown, the following modules are included:

[0066] The generating power calculation module 41 of the range extender is used to obtain the generating power P of the range extender of the electric vehicle according to the vehicle speed information of the electric vehicle when the range extender of the electric vehicle is working. zc ;

[0067] The regenerative braking power calculation module 42 is used to calculate the regenerative braking power P under braking or reverse dragging coasting conditions zd ;

[0068] The currently used braking regenerative power determination module 43 is used to convert the generated power P of the range extender to zc and the brake recuperation power P zd Add up to get the pre-charge power P yc , the precharge power P yc and the maximum allowable charging power P of the power batt...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/00B60L7/20
Inventor 周金龙黄殿辉易迪华
Owner BEIJING ELECTRIC VEHICLE
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