CN-121984183-A - Energy recovery voltage protection method for electric tricycle

CN121984183ACN 121984183 ACN121984183 ACN 121984183ACN-121984183-A

Abstract

The invention discloses an energy recovery voltage protection method for an electric tricycle, which belongs to the technical field of electric control and battery management intersection of the electric tricycle, and has the advantages that the running safety and stability are obviously enhanced, the sudden interruption risk is avoided, a hard overvoltage protection mode with a fixed threshold is abandoned, a progressive power regulation mechanism is constructed, when no communication battery voltage is positioned between a power limiting point and an overvoltage point, the proportional gain and the integral gain are obtained by calculating the error between the actual voltage and the target voltage, the current value of the target voltage is further determined, the generated power is further ensured, the vehicle running interruption caused by directly cutting off MCU output is avoided, the running safety under key working conditions such as abrupt slope descent and braking is ensured, the MCU output is triggered to be disconnected only when the voltage exceeds the overvoltage point, the battery overcharge is avoided, the sudden rise of the bus voltage of the whole vehicle is prevented, the battery attenuation is effectively delayed, and the electric elements such as a vehicle-mounted electric appliance are protected from being damaged.

Inventors

WANG QIUCHEN
LI DONGDONG
CHENG XIAO
GUO YONGYAN
SHEN ZHIWEI
SHENG QI
YANG LIANG
ZHANG JIAYU
Zhong Pinghui

Assignees

江苏金彭集团有限公司

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (6)

1. The energy recovery voltage protection method for the electric tricycle is characterized by comprising the following steps of: s1, judging whether a battery has a communication function or not; S2, when the battery is judged to have no communication function, judging whether the current voltage value is smaller than a power limiting point or not; S3, when the current voltage value is judged to be larger than the power limiting point, judging whether the current voltage value is smaller than the overvoltage point or not; And S4, judging whether the SOC state is greater than or equal to 95% or not when the battery is judged to have the communication function.
2. The method of claim 1, wherein in S2, when the current voltage value is smaller than the power limiting point, the battery is defined to be not full, the energy recovery is limited according to the energy recovery power set by the logic of the vehicle controller, and the vehicle normally uses the energy recovery function.
3. The method of claim 1, wherein in S3, when the current voltage value is less than the overvoltage point, the battery is defined to be full, the proportional gain and the integral gain are calculated according to the error between the actual voltage and the target voltage, and the current value for maintaining the target voltage is calculated to limit the generated power.
4. The method for protecting energy recovery voltage of an electric tricycle according to claim 1, wherein in S3, when the current voltage value is judged to be larger than an overvoltage point, the overvoltage of the battery is defined, the MCU output is immediately disconnected, and damage to the battery and an electric system of the whole tricycle is avoided.
5. The method for protecting energy recovery voltage of electric tricycle according to claim 1, wherein in S4, when SOC is less than 95%, judging whether feedback current sent by a battery is greater than energy recovery power; When the energy recovery power is larger than the energy recovery power, defining a battery state to meet the power consumption requirement of the MCU, and limiting the current according to the maximum energy recovery power, wherein the vehicle normally uses the energy recovery; When the current electric quantity of the battery is high or the temperature of the battery does not meet the energy recovery charging requirement, the MCU limits the energy recovery power according to the feedback current sent by the battery.
6. The method of claim 1, wherein in S4, when the SOC is not less than 95%, the high-power energy recovery function of the battery is defined to be off.

Description

Energy recovery voltage protection method for electric tricycle Technical Field The invention relates to the technical field of electric control and battery management intersection of electric tricycles, in particular to an energy recovery voltage protection method for an electric tricycles. Background The electric tricycle has wide application in short-distance transportation and daily travel by virtue of the advantages of economy, practicality and flexibility, and the energy recovery technology (such as a motor is switched to a generator to convert vehicle kinetic energy into electric energy to feed back to a battery under the working conditions of steep slope descent, sliding or braking) has become one of core means for improving the cruising ability of the electric tricycle. However, the voltage protection scheme of the existing energy recovery system has a plurality of technical short plates, so that the actual use requirement is difficult to meet, the continuous electric energy feedback can lead to the rapid rise of the battery voltage in the energy recovery process, when the voltage approaches or reaches the overvoltage threshold value, the traditional scheme only depends on the fixed voltage threshold value to trigger the hard overvoltage protection, the MCU output is directly cut off, the vehicle is interrupted, the driving safety is seriously affected, the battery is overcharged and the attenuation of the battery is accelerated, and if the response of the self protection mechanism of the battery is delayed, the voltage of the bus of the whole vehicle can further rise suddenly, and further electric elements such as vehicle-mounted electric appliances and the like are damaged. In addition, the traditional protection method does not distinguish whether the battery has a communication function or not, can not adapt to the use scenes of batteries with different specifications, lacks a progressive power regulation mechanism, can not smoothly limit feedback power when the voltage approaches an overvoltage value, so that the voltage control stability is poor, and meanwhile, does not combine key parameters such as the SOC state and the temperature of the battery to dynamically adapt, so that voltage fluctuation is aggravated in low-temperature and other complex environments, and false triggering protection is easily caused, so that the whole vehicle electrical system is damaged. The reliability and the safety of the energy recovery technology of the electric tricycle are seriously reduced, and the application experience of the electric tricycle is restricted from being improved. Disclosure of Invention The invention aims to provide an energy recovery voltage protection method for an electric tricycle, which aims to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the energy recovery voltage protection method for the electric tricycle comprises the following steps of: s1, judging whether a battery has a communication function or not; S2, when the battery is judged to have no communication function, judging whether the current voltage value is smaller than a power limiting point or not; S3, when the current voltage value is judged to be larger than the power limiting point, judging whether the current voltage value is smaller than the overvoltage point or not; And S4, judging whether the SOC state is greater than or equal to 95% or not when the battery is judged to have the communication function. In S2, when the current voltage value is smaller than the power limiting point, the battery is defined to be not full, the energy recovery is limited according to the energy recovery power set by the logic of the whole vehicle controller, and the vehicle normally uses the energy recovery function. In S3, when the current voltage value is judged to be smaller than the overvoltage point, the battery is defined to be full, the proportional gain and the integral gain are calculated according to the error between the actual voltage and the target voltage, and the current value for maintaining the target voltage is calculated to limit the generated power. In S3, when the current voltage value is judged to be larger than the overvoltage point, the overvoltage of the battery is defined, the MCU output is immediately disconnected, and the battery and the whole vehicle electrical system are prevented from being damaged. In S4, when the SOC is less than 95%, judging whether the feedback current sent by the battery is greater than the energy recovery power; When the energy recovery power is larger than the energy recovery power, defining a battery state to meet the power consumption requirement of the MCU, and limiting the current according to the maximum energy recovery power, wherein the vehicle normally uses the energy recovery; When the current electric quantity of the battery is high or the temperature of the battery does not meet