CN-122009140-A - Range extender control method, vehicle control device and vehicle

CN122009140ACN 122009140 ACN122009140 ACN 122009140ACN-122009140-A

Abstract

The application provides a range extender control method, a vehicle control device and a vehicle. The range extender control method comprises the steps of obtaining the battery core temperature of a battery of a vehicle, obtaining the required power of the vehicle when the battery core temperature is higher than a battery temperature threshold and the battery temperature threshold are smaller than a first temperature difference, and controlling the range extender of the vehicle to execute a battery temperature policy matched with a set condition when the required power exceeds the rated power of the battery and exceeds a set period of time, wherein the battery temperature policy comprises a first policy and a second policy, the first policy comprises controlling the range extender to charge the battery, and the second policy comprises controlling the range extender and the battery to supply power to the vehicle. Therefore, the load of the battery can be reduced, the risk of overhigh temperature of the battery core of the battery is reduced, and the limitation of the whole power of the vehicle is avoided. On this basis, the battery overtemperature threshold can be set low, and the transport power of the vehicle can be ensured while ensuring the use safety of the battery.

Inventors

YU CHANGLIANG
REN XIAOYUN
Du Ruotao
ZHAO XINYU

Assignees

浙江远程商用车研发有限公司
浙江吉利控股集团有限公司
浙江远程新能源商用车集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (12)

1. A range extender control method applied to a vehicle, comprising: Acquiring the battery core temperature of a battery of the vehicle; when the temperature of the battery cell is higher than a battery over-temperature threshold value and the temperature of the battery cell and the battery over-temperature threshold value are smaller than a first temperature difference, acquiring the required power of the vehicle; and when the required power exceeds the rated power of the battery and exceeds the set time period, controlling a range extender of the vehicle to execute a battery over-temperature strategy matched with the set condition, wherein the battery over-temperature strategy comprises a first strategy and a second strategy, the first strategy comprises controlling the range extender to charge the battery, and the second strategy comprises controlling the range extender and the battery to supply power to the vehicle.
2. The range extender control method according to claim 1, characterized by further comprising, before the control of the range extender of the vehicle to execute the battery overheat strategy matched to the set condition: acquiring the electric quantity of the battery; the setting conditions are as follows: And executing the second strategy when the electric quantity of the battery is larger than a discharge threshold value, and executing the first strategy when the electric quantity of the battery is smaller than the discharge threshold value.
3. The range extender control method according to claim 2, wherein the discharge threshold includes a first discharge threshold and a second discharge threshold, the first discharge threshold being greater than the second discharge threshold, the setting condition is: Executing the second strategy when the difference between the temperature of the battery core and the over-temperature threshold of the battery is smaller than the first temperature difference and larger than the second temperature difference and the electric quantity of the battery is larger than the first discharge threshold value, and Executing the second strategy when the difference between the battery core temperature and the battery over-temperature threshold is smaller than the second temperature difference and the electric quantity of the battery is larger than the second discharge threshold; Wherein the first temperature difference is greater than the second temperature difference.
4. The method of claim 2, wherein the second strategy comprises controlling the range extender to operate at a first range extender power, the sum of the first range extender power and the battery rated power being equal to the demand power.
5. The range extender control method of claim 2 wherein the discharge threshold comprises a first discharge threshold and a second discharge threshold, the first discharge threshold being greater than the second discharge threshold; the setting conditions are as follows: executing the first strategy when the difference between the temperature of the battery core and the over-temperature threshold of the battery is smaller than the first temperature difference and larger than the second temperature difference and the electric quantity of the battery is smaller than the first discharge threshold value, and Executing the first strategy when the difference between the battery core temperature and the battery over-temperature threshold is smaller than the second temperature difference and the electric quantity of the battery is smaller than the second discharge threshold; Wherein the first temperature difference is less than the second temperature difference.
6. The method of claim 2, wherein the first strategy comprises controlling the range extender to operate at a second range extender power, the second range extender power being equal to a sum of the demand power and a charge additional power.
7. The range extender control method of claim 6, wherein the charge additional power comprises a first charge additional power and a second charge additional power, the first charge additional power being less than the second charge additional power; the setting conditions are as follows: When the difference between the battery cell temperature and the battery over-temperature threshold is smaller than the first temperature difference and larger than a second temperature difference, the electric quantity of the battery is smaller than the first discharge threshold and larger than the second discharge threshold, executing the first strategy, wherein the first strategy comprises that the second range extender power is equal to the sum of the required power and the first charging additional power When the difference value between the battery core temperature and the battery over-temperature threshold is smaller than the first temperature difference and larger than the second temperature difference, and the electric quantity of the battery is smaller than the second discharging threshold, executing the first strategy, wherein the first strategy comprises that the second range extender power is equal to the sum of the required power and the second charging additional power; Wherein the first temperature difference is greater than the second temperature difference.
8. The range extender control method of claim 1 wherein said set duration is inversely related to the ratio of said required power to said battery power rating.
9. The range extender control method of claim 8 wherein the ratio of the required power to the battery rated power has a plurality of incremental gradient intervals, each of the gradient intervals corresponding to a different one of the set durations; and when the required power exceeds the rated power of the battery and exceeds a set time length, controlling a range extender of the vehicle to execute a battery over-temperature strategy matched with a set condition, wherein the method comprises the following steps of: when the ratio of the required power to the rated power of the battery is greater than 1, timing the time period when the required power exceeds the rated power of the battery; when the required power exceeds the rated power of the battery and is smaller than the set time length, and the gradient interval of the ratio of the required power to the rated power of the battery is changed, the set time length corresponds to the updated gradient interval.
10. The range extender control method according to claim 1, characterized in that the range extender control method further comprises: And when the range extender executes the battery over-temperature strategy and the temperature of the battery core is lower than the starting temperature of the range extender, ending the battery over-temperature strategy, wherein the starting temperature of the range extender is lower than the battery over-temperature threshold.
11. A vehicle control apparatus for performing the range extender control method according to any one of claims 1 to 10.
12. A vehicle comprising a range extender and the vehicle control device of claim 11, the vehicle control device being connected to the range extender.

Description

Range extender control method, vehicle control device and vehicle Technical Field The present application relates to the field of range extenders, and in particular, to a range extender control method, a vehicle control device, and a vehicle. Background With the continuous increase of market share of extended range trucks, the utilization rate of 2C and multi-C batteries has increased, and long endurance and efficient operation of extended range automobiles without gaps have become normal. The battery core temperature of the battery is easy to rise due to high-rate charge and discharge, and meanwhile, under the condition of heavy-load operation of a range-extended truck, the required power of the whole truck is increased, so that the phenomenon of over-temperature of the battery in the running process of the vehicle is further aggravated. When the battery is charged at a high rate, the problem that the temperature of the battery core is too high is easily generated, the cooling threshold of the battery needs to be reduced in the running process, so that the risk of the battery over-temperature is reduced as much as possible, and if the temperature of the battery core is too high, the required power of the whole vehicle is limited. When the power required by the whole vehicle is limited, a long time is required to recover the power output of the battery, and meanwhile, the energy consumption of the vehicle running is easily increased, so that the duration of the whole vehicle is shortened. Disclosure of Invention The application provides a range extender control method, a vehicle control device and a vehicle for reducing the risk of overhigh temperature of an electric core of a battery. In a first aspect, the present application provides a range extender control method, applied to a vehicle, including: Acquiring the battery core temperature of a battery of the vehicle; when the temperature of the battery cell is higher than a battery over-temperature threshold value and the temperature of the battery cell and the battery over-temperature threshold value are smaller than a first temperature difference, acquiring the required power of the vehicle; and when the required power exceeds the rated power of the battery and exceeds the set time period, controlling a range extender of the vehicle to execute a battery over-temperature strategy matched with the set condition, wherein the battery over-temperature strategy comprises a first strategy and a second strategy, the first strategy comprises controlling the range extender to charge the battery, and the second strategy comprises controlling the range extender and the battery to supply power to the vehicle. Optionally, before the controlling the range extender of the vehicle executes the battery over-temperature strategy matched with the set condition, the method further includes: acquiring the electric quantity of the battery; the setting conditions are as follows: And executing the second strategy when the electric quantity of the battery is larger than a discharge threshold value, and executing the first strategy when the electric quantity of the battery is smaller than the discharge threshold value. Optionally, the discharge threshold includes a first discharge threshold and a second discharge threshold, the first discharge threshold is greater than the second discharge threshold, and the setting condition is: Executing the second strategy when the difference between the temperature of the battery core and the over-temperature threshold of the battery is smaller than the first temperature difference and larger than the second temperature difference and the electric quantity of the battery is larger than the first discharge threshold value, and Executing the second strategy when the difference between the battery core temperature and the battery over-temperature threshold is smaller than the second temperature difference and the electric quantity of the battery is larger than the second discharge threshold; Wherein the first temperature difference is greater than the second temperature difference. Optionally, the second strategy comprises controlling the range extender to operate at a first range extender power, wherein the sum of the first range extender power and the rated power of the battery is equal to the required power. Optionally, the discharge threshold includes a first discharge threshold and a second discharge threshold, the first discharge threshold being greater than the second discharge threshold; the setting conditions are as follows: executing the first strategy when the difference between the temperature of the battery core and the over-temperature threshold of the battery is smaller than the first temperature difference and larger than the second temperature difference and the electric quantity of the battery is smaller than the first discharge threshold value, and Executing the first strategy when the difference between the battery core temper