CN-114825773-B - Method and device for detecting temperature of cooling liquid of vehicle, medium and vehicle

CN114825773BCN 114825773 BCN114825773 BCN 114825773BCN-114825773-B

Abstract

The disclosure relates to a vehicle cooling liquid temperature detection method, device, medium and vehicle, which comprise the steps of obtaining initial temperatures of a plurality of parts to be cooled in the vehicle under the condition that the vehicle is in a low-voltage power-on state, determining the initial temperatures of cooling liquid according to the initial temperatures of the parts to be cooled, obtaining first temperature change values of the parts to be cooled in each sampling period according to a preset sampling period under the condition that the vehicle is in a high-voltage power-on state, and determining the temperature of the cooling liquid at the end of each sampling period according to the initial temperatures of the cooling liquid and the first temperature change values. Therefore, the temperature of the cooling liquid can be detected without arranging a cooling liquid temperature sensor, so that on one hand, the hardware cost is reduced, and on the other hand, the problem of inaccurate temperature detection results caused by hardware faults of the cooling liquid temperature sensor is also reduced, and the stability of a vehicle cooling system is improved.

Inventors

XU YAN
ZHANG ZHE
CAO XU
ZHANG LIANZHONG
DONG XINRAN
HAN FENG
GAO ZELIN
SHAN HONGYAN

Assignees

长城汽车股份有限公司

Dates

Publication Date: 20260512
Application Date: 20210118

Claims (8)

1. A method for detecting a temperature of a coolant of a vehicle, the method comprising: Under the condition that the vehicle is in a low-voltage power-on state, acquiring initial temperatures of a plurality of parts to be cooled in the vehicle, wherein the parts to be cooled are vehicle parts cooled by cooling liquid; determining an initial temperature of the cooling liquid according to the initial temperatures of a plurality of the components to be cooled; Under the condition that the vehicle is in a high-voltage power-on state, acquiring a first temperature change value of each part to be cooled in each sampling period according to a preset sampling period; Determining the temperature of the cooling liquid at the end of each sampling period according to the initial temperature of the cooling liquid and the first temperature change value; The determining the temperature of the cooling liquid at the end of each sampling period according to the initial temperature of the cooling liquid and the first temperature variation value comprises: Determining heat change values of cooling liquid corresponding to the components to be cooled in each sampling period according to the first temperature change values; determining the temperature of the cooling liquid at the end of each sampling period according to the heat variation value and the initial temperature of the cooling liquid; The determining the heat variation values of the cooling liquid corresponding to the components to be cooled in each sampling period according to the first temperature variation values comprises the following steps: acquiring the cooling liquid quality corresponding to each part to be cooled; And determining the heat change value of the cooling liquid corresponding to each part to be cooled in each sampling period according to the first temperature change value and the cooling liquid quality.
2. The method of claim 1, wherein said determining an initial temperature of the cooling fluid based on the initial temperatures of the plurality of components to be cooled comprises: and determining the temperature with the minimum value in the initial temperatures of the components to be cooled as the initial temperature of the cooling liquid.
3. The method of claim 1, wherein said determining the temperature of the cooling fluid at the end of each of the sampling periods based on the heat variation value and the initial temperature of the cooling fluid comprises: acquiring the total mass of the cooling liquid; determining a total heat change value of the cooling liquid in each sampling period according to the heat change value of the cooling liquid in each sampling period, which corresponds to each part to be cooled, respectively; determining a second temperature variation value of the cooling liquid in each sampling period according to the total heat variation value and the total mass of the cooling liquid; Determining the temperature of the cooling liquid at the end of each sampling period by the initial temperature of the cooling liquid and the second temperature variation value of the cooling liquid in each sampling period.
4. The method according to claim 1, wherein the component to be cooled includes a vehicle motor, and wherein the acquiring the first temperature change value of each component to be cooled in each sampling period according to a preset sampling period when the vehicle is in a high-voltage power-on state includes: under the condition that the vehicle is in the high-voltage power-on state, acquiring the motor temperature in the vehicle motor at the end of each sampling period, and determining the difference value between the motor temperature and the motor temperature acquired at the end of the last sampling period as a first temperature change value of the vehicle motor in the current sampling period; And if the current sampling period is the first sampling period after the vehicle enters the high-voltage power-on state, determining the difference value between the motor temperature acquired at the end of the current sampling period and the initial temperature of the vehicle motor as a first temperature change value of the vehicle motor in the current sampling period.
5. The method of claim 1, wherein the component to be cooled includes a vehicle motor controller, and wherein the acquiring the first temperature change value of each component to be cooled in each sampling period according to a preset sampling period when the vehicle is in a high-voltage power-on state includes: And under the condition that the vehicle is in the high-voltage power-on state, acquiring the water inlet temperature and the water outlet temperature of the vehicle motor controller at the end of each sampling period, and determining the difference value between the water inlet temperature and the water outlet temperature as a first temperature change value of the vehicle motor controller in the sampling period.
6. A vehicle coolant temperature detection apparatus, characterized by comprising: The first acquisition module is used for acquiring initial temperatures of a plurality of parts to be cooled in the vehicle under the condition that the vehicle is in a low-voltage power-on state, wherein the parts to be cooled are vehicle parts cooled by cooling liquid; A first determining module for determining an initial temperature of the cooling liquid according to initial temperatures of a plurality of the components to be cooled; the second acquisition module is used for acquiring a first temperature change value of each part to be cooled in each sampling period according to a preset sampling period under the condition that the vehicle is in a high-voltage power-on state; a second determining module, configured to determine a temperature of the cooling liquid at the end of each sampling period according to an initial temperature of the cooling liquid and the first temperature variation value; The second determining module comprises a first determining submodule and a second determining submodule, wherein the first determining submodule is used for determining heat change values of cooling liquid corresponding to a plurality of parts to be cooled respectively in each sampling period according to the first temperature change values; a second determining sub-module for determining a temperature of the cooling liquid at the end of each of the sampling periods according to the heat variation value and an initial temperature of the cooling liquid; the first determination submodule is further used for obtaining the cooling liquid quality corresponding to each part to be cooled respectively, and determining the heat change value of the cooling liquid corresponding to each part to be cooled in each sampling period according to the first temperature change value and the cooling liquid quality; The second determining submodule is further used for obtaining the total mass of the cooling liquid, determining the total heat change value of the cooling liquid in each sampling period according to the heat change value of the cooling liquid corresponding to each part to be cooled in each sampling period, determining the second temperature change value of the cooling liquid in each sampling period according to the total heat change value and the total mass of the cooling liquid, and determining the temperature of the cooling liquid at the end of each sampling period according to the initial temperature of the cooling liquid and the second temperature change value of the cooling liquid in each sampling period.
7. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any one of claims 1-5.
8. A vehicle comprising the vehicle coolant temperature detection apparatus according to claim 6.

Description

Method and device for detecting temperature of cooling liquid of vehicle, medium and vehicle Technical Field The disclosure relates to the field of vehicles, and in particular relates to a vehicle coolant temperature detection method, a device, a medium and a vehicle. Background In the existing vehicles, the temperature of the cooling liquid needs to be monitored, so that the heat dissipation of the vehicles is controlled in time. The common monitoring method generally detects the temperature of the cooling liquid through the installed cooling liquid temperature sensor, so that the cost of the whole vehicle is increased, the condition that the temperature cannot be detected due to the damage of the temperature sensor exists, and the monitoring effect is influenced by the stability of the temperature sensor. Disclosure of Invention The purpose of the present disclosure is to provide a method, a device, a medium and a vehicle for detecting the temperature of a cooling liquid of a vehicle, wherein the temperature of the cooling liquid can be detected without setting a cooling liquid temperature sensor, so that on one hand, the hardware cost is reduced, on the other hand, the problem of inaccurate temperature detection results caused by hardware faults of the cooling liquid temperature sensor is also reduced, and the stability of a cooling system of the vehicle is improved. In order to achieve the above object, the present disclosure provides a vehicle coolant temperature detection method, the method including: Under the condition that the vehicle is in a low-voltage power-on state, acquiring initial temperatures of a plurality of parts to be cooled in the vehicle, wherein the parts to be cooled are vehicle parts cooled by cooling liquid; determining an initial temperature of the cooling liquid according to the initial temperatures of a plurality of the components to be cooled; Under the condition that the vehicle is in a high-voltage power-on state, acquiring a first temperature change value of each part to be cooled in each sampling period according to a preset sampling period; and determining the temperature of the cooling liquid at the end of each sampling period according to the initial temperature of the cooling liquid and the first temperature change value. Optionally, the determining the initial temperature of the cooling liquid according to the initial temperatures of the plurality of the components to be cooled includes: and determining the temperature with the minimum value in the initial temperatures of the components to be cooled as the initial temperature of the cooling liquid. Optionally, the determining the temperature of the cooling liquid at the end of each sampling period according to the initial temperature of the cooling liquid and the first temperature variation value includes: Determining heat change values of cooling liquid corresponding to the components to be cooled in each sampling period according to the first temperature change values; And determining the temperature of the cooling liquid at the end of each sampling period according to the heat change value and the initial temperature of the cooling liquid. Optionally, the determining, according to the first temperature change value, a heat change value of the cooling liquid corresponding to the components to be cooled in each sampling period includes: acquiring the cooling liquid quality corresponding to each part to be cooled; And determining the heat change value of the cooling liquid corresponding to each part to be cooled in each sampling period according to the first temperature change value and the cooling liquid quality. Optionally, said determining the temperature of the cooling fluid at the end of each of said sampling periods based on said heat variation value and an initial temperature of the cooling fluid comprises: acquiring the total mass of the cooling liquid; determining a total heat change value of the cooling liquid in each sampling period according to the heat change value of the cooling liquid in each sampling period, which corresponds to each part to be cooled, respectively; determining a second temperature variation value of the cooling liquid in each sampling period according to the total heat variation value and the total mass of the cooling liquid; Determining the temperature of the cooling liquid at the end of each sampling period by the initial temperature of the cooling liquid and the second temperature variation value of the cooling liquid in each sampling period. Optionally, the to-be-cooled component includes a vehicle motor, and when the vehicle is in a high-voltage on-state, acquiring the first temperature change value of each to-be-cooled component in each sampling period according to a preset sampling period includes: under the condition that the vehicle is in the high-voltage power-on state, acquiring the motor temperature in the vehicle motor at the end of each sampling period, and determining t