CN-115899228-B - Temperature determination method and device for transmission lubricating oil and vehicle

CN115899228BCN 115899228 BCN115899228 BCN 115899228BCN-115899228-B

Abstract

The invention discloses a temperature determining method and device of transmission lubricating oil and a vehicle. The method comprises the steps of collecting vehicle running state information, engine running state information, working state information of components in a transmission, transmission shell information, radiator working state information, physical characteristics of components of a transmission assembly, oil body temperature collected by an oil temperature sensor and environment temperature, determining transmission heating power based on the vehicle running state information, the engine running state information and the working state information of the components in the transmission, determining transmission heat dissipation power based on the transmission heating power, the transmission shell information, the radiator working state information, the environment temperature and the oil body temperature, determining transmission oil temperature rise based on the physical characteristics of the components of the transmission assembly and the transmission heat dissipation power, and determining actual oil temperature of lubricating oil based on the oil body temperature and the transmission oil temperature rise. The invention solves the problem of inaccurate oil temperature detection under the severe working condition of the related technology.

Inventors

KANG ZHIJUN
JIN XINGYUE
FAN XUELAI
LIU ZHENYU
ZHAO JIANTAO
YE KEYU
WU SHINAN
XIE RUI
SONG JIANJUN
MAO ZEXIAN

Assignees

中国第一汽车股份有限公司

Dates

Publication Date: 20260508
Application Date: 20221130

Claims (8)

1. A method of determining the temperature of a transmission lubricant, the method comprising the steps of: Collecting vehicle running state information, engine running state information, working state information of components in a transmission, transmission shell information, radiator working state information, physical characteristics of components of a transmission assembly, oil body temperature and environmental temperature collected by an oil temperature sensor, wherein the oil temperature sensor is arranged at one end of a control valve body of the transmission, which is immersed in lubricating oil, and the oil temperature sensor is used for collecting the oil body temperature of the lubricating oil in the transmission; determining transmission heating power based on the vehicle running state information, the engine running state information and the working state information of components in the transmission; Determining transmission heat dissipation power based on the transmission heat generation power, the transmission housing information, the radiator operating state information, the ambient temperature, and the oil body temperature; determining a transmission oil temperature rise based on physical characteristics of the transmission assembly components and the transmission heat sink power; Determining an actual oil temperature of the lubricating oil based on the oil body temperature and the transmission oil temperature rise; determining transmission heating power based on the vehicle running state information, the engine running state information and the working state information of components in the transmission, wherein the method comprises the following steps of: Inputting the vehicle running state information and the engine running state information into a first calculation model, and outputting a first transmission heating power; inputting the working state information of the components in the transmission into a second calculation model, and outputting second heating power of the transmission; Determining a transmission heating power based on the transmission first heating power and the transmission second heating power; determining transmission heating power based on the transmission first heating power and the transmission second heating power, comprising: Collecting vehicle speed information; under the condition that the vehicle speed is larger than a preset vehicle speed value, determining that the first transmission heating power is the transmission heating power; and under the condition that the vehicle speed is smaller than the preset vehicle speed value, determining the second heating power of the transmission as the heating power of the transmission.
2. The method of claim 1, wherein inputting the vehicle operating state information and the engine operating state information into a first calculation model, outputting a transmission first heat generation power, comprises: inputting the vehicle running state information into a first power model, and outputting transmission output power; inputting the engine running state information into a second power model, and outputting transmission input power; and inputting the transmission output power and the transmission input power into a third power model, and outputting the transmission first heating power.
3. The method of claim 1, wherein determining transmission heat dissipation power based on the transmission heat generation power, the transmission housing information, the radiator operating state information, the ambient temperature, and the oil body temperature comprises: inputting the transmission housing information, the ambient temperature and the oil temperature into a first heat dissipation model, and outputting transmission housing heat dissipation power; Inputting the working state information of the radiator and the temperature of the oil body into a second heat dissipation model, and outputting heat dissipation power of the radiator; and inputting the heat dissipation power of the transmission shell, the heat dissipation power of the radiator and the heating power of the transmission into a third heat dissipation model, and outputting the heat dissipation power of the transmission.
4. The method of claim 1, wherein the operating state information of the components in the transmission includes at least clutch operating state information, bearing operating state information, and shaft tooth operating state information, and inputting the operating state information of the components in the transmission into a second calculation model to output a second heating power of the transmission includes: inputting the clutch working state information into a clutch heating model, and outputting clutch heating power; inputting the working state information of the shaft teeth into a first gear heating model, and outputting gear engagement friction heating power; inputting the working state information of the shaft teeth into a second gear heating model, and outputting the oil stirring heating power of the gear; Inputting the bearing working state information into a bearing heating model, and outputting the bearing heating power; and inputting the clutch heating power, the gear engagement friction heating power, the gear oil stirring heating power and the bearing heating power into a heating calculation model, and outputting the second heating power of the transmission.
5. A method according to claim 1 or 2, characterized in that, The vehicle running state information at least comprises one of vehicle running speed, steering wheel steering angle, tire steering angle, brake pedal signal, brake master cylinder pressure signal, accelerator pedal opening, wheel speed difference, X-direction acceleration signal and Y-direction acceleration signal; The engine operating state information includes at least one of an engine speed, a combustion torque, a torque loss, a throttle opening degree, and a cooling water temperature.
6. A method according to claim 1 or 3, characterized in that, The transmission housing information includes at least a housing area; The working state information of the radiator at least comprises one of water inlet temperature, cooling water flow and heat exchange oil flow of the cooler; the physical characteristics of the components of the transmission assembly at least comprise one of specific heat capacity and mass.
7. A temperature determining device for transmission lubricating oil, characterized in that the device is adapted to perform the method of any one of claims 1-6, comprising: The system comprises an acquisition module, a control valve body, a heat-conducting device and a heat-conducting device, wherein the acquisition module is used for acquiring vehicle running state information, engine running state information, working state information of components in a transmission, transmission shell information, radiator working state information, physical characteristics of components of a transmission assembly, oil body temperature acquired by an oil temperature sensor and environment temperature, the oil temperature sensor is arranged at one end of the control valve body of the transmission, which is immersed in lubricating oil, and the oil temperature sensor is used for acquiring the oil body temperature of the lubricating oil in the transmission; The first calculation module is used for determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of components in the transmission; The second calculation module is used for determining transmission heat dissipation power based on the transmission heat dissipation power, the transmission shell information, the radiator working state information, the environment temperature and the oil body temperature; A third calculation module for determining a transmission oil temperature rise based on physical characteristics of the transmission assembly components and the transmission heat sink power; And the oil temperature calculation module is used for determining the actual oil temperature of the lubricating oil based on the oil body temperature and the transmission oil temperature rise.
8. A vehicle comprising a transmission, characterized in that the temperature of the lubricating oil of the transmission is determined using the temperature determination method of the lubricating oil of the transmission according to any one of claims 1 to 6.

Description

Temperature determination method and device for transmission lubricating oil and vehicle Technical Field The invention relates to the technical field of vehicle transmission oil temperature detection, in particular to a temperature determining method and device of transmission lubricating oil and a vehicle. Background The existing automatic transmission is provided with an oil temperature sensor, the temperature of lubricating oil is monitored in real time, the control unit of the automatic transmission monitors the working states of each gear shifting element and each clutch element in real time according to the collected temperature of the lubricating oil, and corresponding protection is carried out according to the temperature of the lubricating oil, such as protection of the temperature of a friction plate of a clutch, protection of components of the gear shifting, cooling protection of a motor of the hybrid transmission and the like. There are two existing oil temperature sensor arrangements: The first scheme is that the sensor is arranged at the part of the control valve body immersed in lubricating oil, an oil temperature sensor is arranged, the sensor is arranged at normal pressure, the sensor is integrated on the valve body, the arrangement is simple, the connection of a wire harness is reliable, signals are collected at normal pressure, the cost is low, but the scheme has the following defects that 1, the temperature of a fixed point is collected, only the temperature of a point nearby the sensor is collected, the scheme is more suitable for steady-state working condition and monitoring of the balance temperature of the lubricating oil, 2, the local temperature is not detected to be too high, and 3, the instantaneous temperature is not easy to monitor. In the second scheme, the sensor is arranged in the hydraulic oil pump outlet pipeline, a high-pressure oil temperature sensor is arranged in the hydraulic oil pump outlet pipeline, the monitoring signal of the scheme is reliable, the temperature information collected by the oil temperature sensor protects the element of the transmission more accurately, but the requirements of high pressure, sealing, signal line arrangement and the like are met due to the arrangement environment, the cost is high, the arrangement is difficult, the manufacturability is poor, leakage failure is easy to occur, and faults are brought to a hydraulic system. In summary, in the prior art, how to solve the problem of overtemperature reliability of the clutch under severe working conditions becomes a current key problem for an automatic transmission. In view of the above problems, no effective solution has been proposed at present. Disclosure of Invention The embodiment of the invention provides a temperature determining method and device for transmission lubricating oil and a vehicle, which are used for at least solving the technical problem of inaccurate oil temperature detection under severe working conditions in the related art. According to one aspect of the embodiment of the invention, a temperature determination method for lubricating oil of a transmission is provided, and is characterized by comprising the steps of collecting vehicle running state information, engine running state information, running state information of components in the transmission, transmission shell information, radiator running state information, physical characteristics of components of a transmission assembly, oil body temperature collected by an oil temperature sensor and environment temperature, wherein the oil temperature sensor is arranged at one end of a control valve body of the transmission, which is immersed in lubricating oil, the oil temperature sensor is used for collecting the oil body temperature of the lubricating oil in the transmission, determining heating power of the transmission based on the vehicle running state information, the engine running state information and the running state information of the components in the transmission, determining the radiating power of the transmission based on the transmission shell information, the radiator running state information, the environment temperature and the oil body temperature, determining the temperature rise of the transmission oil based on the physical characteristics of the components of the transmission assembly and the radiating power of the transmission, and determining the actual oil temperature rise of the lubricating oil based on the oil body temperature and the temperature rise of the transmission oil. The method comprises the steps of inputting vehicle running state information and engine running state information into a first calculation model to output transmission first heating power, inputting the running state information of the components in the transmission into a second calculation model to output transmission second heating power, and determining the transmission heating power based on the transmission f