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CN-122016083-A - Ambient temperature estimation method and vehicle

CN122016083ACN 122016083 ACN122016083 ACN 122016083ACN-122016083-A

Abstract

The application relates to an ambient temperature estimation method and a vehicle, wherein the ambient temperature estimation method comprises the steps of detecting whether signals of an air inlet temperature sensor and a supercharger temperature sensor of an engine of the vehicle are valid or not after power-on time when the vehicle is detected to enter a power-on state and the ambient temperature sensor of the vehicle is invalid, and determining an ambient temperature estimation value of the vehicle after the power-on time according to sensor data of the air inlet temperature sensor and sensor data of the supercharger temperature sensor if the signals of the air inlet temperature sensor and the signals of the supercharger temperature sensor of the engine of the vehicle are valid after the power-on time. According to the method, the estimation of the ambient temperature can be realized according to the air inlet temperature sensor and the supercharger temperature sensor on the air inlet path of the engine, so that the input of the ambient temperature information of the hybrid power system can be still ensured under the condition that the ambient temperature sensor fails.

Inventors

  • JING JUNCHAO
  • SUN XUDONG

Assignees

  • 极光湾(宁波)智能科技有限公司
  • 极光湾科技有限公司

Dates

Publication Date
20260512
Application Date
20260306

Claims (10)

  1. 1. An ambient temperature estimation method for a hybrid vehicle, the method comprising: Detecting whether signals of an air inlet temperature sensor and a supercharger temperature sensor of an engine of the vehicle are valid or not after power-on time under the condition that the vehicle is detected to enter a power-on state and an ambient temperature sensor of the vehicle is invalid; And if signals of an air inlet temperature sensor and a supercharger temperature sensor of an engine of the vehicle are valid after the power-on time, determining an estimated value of the environment temperature of the vehicle after the power-on time according to sensor data of the air inlet temperature sensor and the supercharger temperature sensor.
  2. 2. The method according to claim 1, wherein determining an estimated value of an ambient temperature of the vehicle after a power-on time based on respective sensor data of the intake air temperature sensor and the supercharger temperature sensor includes: And taking the minimum value between the sensor data of the air inlet temperature sensor and the sensor data of the supercharger temperature sensor at the non-power-on time as the environment temperature estimated value at the non-power-on time, wherein the non-power-on time is the time when the vehicle is in a running state after the power-on time.
  3. 3. The ambient temperature estimation method according to claim 1, characterized in that, after the power-on timing, when the signal of the intake air temperature sensor is invalid and/or the signal of the supercharger temperature sensor is invalid, the method further comprises: acquiring the environmental temperature estimated value of a pre-stored historical moment; And determining the minimum value among the sensor data of the air inlet temperature sensor at the non-power-on moment, the sensor data of the supercharger temperature sensor at the non-power-on moment and the environment temperature estimated value at the historical moment as the environment temperature estimated value at the non-power-on moment.
  4. 4. The method of ambient temperature estimation according to claim 1, further comprising: Acquiring sensor data of the air inlet temperature sensor at the power-on time, sensor data of the supercharger temperature sensor at the power-on time and a prestored environmental temperature estimated value at a historical time under the condition that the vehicle is detected to enter a power-on state and the environmental temperature sensor fails; taking the minimum value between the sensor data of the air inlet temperature sensor at the power-on moment and the sensor data of the supercharger temperature sensor at the power-on moment as a value to be compared; determining a temperature rise limit value, wherein the temperature rise limit value represents a temperature rise value between the allowable power-on time and the historical time under different stop time durations of the vehicle; judging whether the temperature difference between the value to be compared and the basic value is smaller than or equal to the temperature rise limit value or not; and taking the sum of the basic value and the added value as an estimated value of the ambient temperature at the power-on time.
  5. 5. The method of ambient temperature estimation according to claim 4, further comprising: when the temperature difference value is larger than the temperature rising limit value, taking the temperature rising limit value as an increasing value; and taking the sum of the basic value and the added value as an estimated value of the ambient temperature at the power-on time.
  6. 6. The method of estimating ambient temperature according to claim 4, wherein determining the temperature rise limit value includes: Acquiring the stop time length of the vehicle; and determining a temperature rise limit value corresponding to the vehicle stop time from a preset mapping relation between different stop time and different temperature rise limit values according to the vehicle stop time, wherein the temperature rise limit value in the mapping relation increases along with the increase of the stop time.
  7. 7. The method according to claim 1, characterized by detecting whether a signal of an intake air temperature sensor of an engine of the vehicle is valid after a power-on time, comprising: when the air inlet flow rate of the engine is smaller than a preset low flow rate threshold value, determining that the signal of the air inlet temperature sensor is invalid; And when the accumulated value of the air inlet flow rate of the engine in the preset period is smaller than a preset accumulated value threshold value, determining that the signal of the air inlet temperature sensor is invalid, wherein the accumulated value threshold value represents the air inlet flow rate required for cooling the air inlet temperature sensor.
  8. 8. The method according to claim 1, wherein determining whether a signal of a supercharger temperature sensor of an engine of the vehicle is valid after a power-on time, comprises: Determining that a signal of the supercharger temperature sensor is valid when a speed of the vehicle is greater than a preset first speed threshold and less than or equal to a preset second speed threshold and an outlet pressure of the supercharger is within a preset first pressure range, wherein the first pressure range represents the outlet pressure range of the supercharger when the engine is in a low load state, the first speed threshold is less than the second speed threshold, the first speed threshold represents a minimum speed value of the vehicle from a stationary state to a moving state, and the second speed threshold represents a minimum speed value of the vehicle to a driving state; And when the speed of the vehicle is greater than the second speed threshold value and the outlet pressure of the supercharger is in a preset second pressure range, determining that the signal of the supercharger temperature sensor is effective, wherein the value in the second pressure range is greater than the value in the first pressure range, and the second pressure range represents the outlet pressure range of the supercharger when the engine is in a high-load state.
  9. 9. The ambient temperature estimation method according to any one of claims 1 to 8, characterized in that the method further comprises: and filtering the environmental temperature estimated value to obtain a target environmental temperature value of the vehicle in a power-on running state.
  10. 10. A vehicle comprising a memory and a processor, the memory having a computer program stored therein, the processor being arranged to run the computer program to perform the ambient temperature estimation method of any one of claims 1 to 9.

Description

Ambient temperature estimation method and vehicle Technical Field The present application relates to the field of hybrid vehicles, and more particularly to an ambient temperature estimation method and a vehicle. Background Currently, in order to meet the requirements of energy conservation and emission reduction, the automobile industry is accelerating to develop in the electrification direction. The battery cost, the technical complexity and other factors of the pure electric vehicle have challenges in large-scale popularization, so that a hybrid power system, particularly a double-motor hybrid power system with high integration level, is widely focused and applied in the field of vehicles. Fig. 1 is a schematic structural diagram of a dual motor hybrid system. Referring to fig. 1, the hybrid system includes an engine, a battery, a ratio system for performing system diagnostics and control, a clutch C0, a motor P1, and a motor P2. The hybrid power system can realize various working modes such as pure electricity, serial connection, parallel connection and the like through the coordination of the clutch C0 so as to adapt to complex driving working conditions. The vehicle wheel is driven by the P2 clutch in the series mode, the C0 clutch is not combined, the engine charges the battery through the P1, and the vehicle wheel is directly driven by the engine in the parallel mode. The control accuracy of the hybrid system is highly dependent on the input signals of various types of sensors, wherein the ambient temperature is one of the key parameters. The ambient temperature is not only used to modify the thermal management control strategy of the engine, battery and motor, but is also more directly related to the driving safety and riding comfort of the vehicle. Currently, in the related art, an ambient temperature sensor is generally relied upon to directly acquire the ambient temperature of the vehicle. When an ambient temperature sensor fails or signals are distorted, the whole vehicle control system cannot be effectively corrected due to the fact that accurate temperature reference is lost, so that system performance is reduced, energy consumption is increased, and even potential safety hazards are caused. Therefore, how to ensure the input of the environmental temperature information controlled by the hybrid power system under the condition that the environmental temperature sensor fails, no effective solution is proposed at present. Disclosure of Invention In this embodiment, an environmental temperature estimation method and a vehicle are provided to solve the problem that in the related art, in the case of failure of an environmental temperature sensor, accurate input of environmental temperature information controlled by a hybrid power system cannot be achieved. In a first aspect, in the present embodiment, there is provided an ambient temperature estimation method for a hybrid vehicle, the method including: Detecting whether signals of an air inlet temperature sensor and a supercharger temperature sensor of an engine of the vehicle are valid or not after power-on time under the condition that the vehicle is detected to enter a power-on state and an ambient temperature sensor of the vehicle is invalid; And if signals of an air inlet temperature sensor and a supercharger temperature sensor of an engine of the vehicle are valid after the power-on time, determining an estimated value of the environment temperature of the vehicle after the power-on time according to sensor data of the air inlet temperature sensor and the supercharger temperature sensor. In some of these embodiments, determining an ambient temperature estimate of the vehicle after a power-up time from respective sensor data of the intake air temperature sensor and the supercharger temperature sensor includes: And taking the minimum value between the sensor data of the air inlet temperature sensor and the sensor data of the supercharger temperature sensor at the non-power-on time as the environment temperature estimated value at the non-power-on time, wherein the non-power-on time is the time when the vehicle is in a running state after the power-on time. In some of these embodiments, after the power-up time, when the signal of the intake air temperature sensor is invalid, and/or the signal of the supercharger temperature sensor is invalid, the method further includes: acquiring the environmental temperature estimated value of a pre-stored historical moment; And determining the minimum value among the sensor data of the air inlet temperature sensor at the non-power-on moment, the sensor data of the supercharger temperature sensor at the non-power-on moment and the environment temperature estimated value at the historical moment as the environment temperature estimated value at the non-power-on moment. In some of these embodiments, the method further comprises: Acquiring sensor data of the air inlet temperature sensor at the power-on time, sen