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Control method for safety driving current of electric automobile

An electric vehicle, safe drive technology, applied in electric vehicles, control drive, electric traction and other directions, can solve the problems of reducing energy use efficiency, reducing battery cycle life, etc., to achieve the effect of current controllable and safe

Active Publication Date: 2015-05-27
SOUEAST
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  • Application Information

AI Technical Summary

Problems solved by technology

The discharge of power batteries for electric vehicles is generally based on constant power and pulse discharge methods. High-rate charge and discharge will not only reduce the efficiency of energy use, but also reduce the cycle life of the battery.

Method used

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  • Control method for safety driving current of electric automobile
  • Control method for safety driving current of electric automobile
  • Control method for safety driving current of electric automobile

Examples

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Embodiment Construction

[0024] A method for controlling a safe driving current of an electric vehicle, comprising the following steps:

[0025] Step 1: The vehicle controller calculates the current dischargeable power P of the battery according to the current battery SOC and battery temperature 能放电 , and then according to the current motor speed V fed back by the MCU, use the formula P 能放电 / V=T1 Calculate the driving torque value T1 of the battery at the current vehicle speed;

[0026] When the battery management system feeds back the fault information of the battery to the vehicle controller, the dischargeable power P of the battery in step 1 能放电 The calculation method is as follows:

[0027] The vehicle controller calculates the battery discharge power P according to the current maximum discharge current and minimum discharge voltage information of the battery 2 , then according to the formula P 能放电 =P 2 × K 2 × K 3 Calculate the dischargeable power P of the battery 能放电 , to ensure that the...

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Abstract

The invention discloses a control method for safety driving current of an electric automobile. The control method comprises the following steps of calculating energy discharging power P(energy discharging) of a current battery according to an SOC (state of charge) of the current battery and the battery temperature, and calculating a driving torque value T1 of the battery under the current automobile speed according to a formula P(energy charging) / V=T1 according to the current rotating speed V of a motor; calculating the maximum allowable driving torque T(max allowable) of the motor by the whole automobile controller according to an overload coefficient K1 under the current motor temperature and the optimal torque T(optimal torque) under the current rotating speed of the motor; comparing the driving torque value T1 with the maximum allowable driving torque T(max allowable) by the whole automobile controller, taking a smaller value as the maximum driving torque value for electric automobile driving, and multiplying the maximum driving torque value with a torque coefficient corresponding to the openness of an acceleration pedal to obtain the current safety driving current. According to the control method, the driving performance of the electric automobile is improved, and the service life of a power battery pack is prolonged; the current controllability and the safety during motor-operated running are guaranteed.

Description

technical field [0001] The invention specifically relates to a control method for a safe driving current of an electric vehicle. Background technique [0002] At present, the controllability of the discharge of the battery pack during the driving process of electric vehicles is not strong, and the power battery system and motor system of the whole vehicle cannot be coordinated comprehensively. [0003] The charge and discharge rate of electric vehicle power battery is affected by battery material, design process, production process and other aspects. The discharge of power batteries for electric vehicles is generally based on constant power and pulse discharge methods. High-rate charge and discharge not only reduces the efficiency of energy use, but also reduces the cycle life of the battery. There are time control, voltage control and temperature control to control the charging and discharging of electric vehicle power battery. In practical applications, the three control...

Claims

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Application Information

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IPC IPC(8): B60L15/00B60L11/18
CPCY02T10/70
Inventor 邓冠丰谢俊淋李青
Owner SOUEAST
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