Motor Control Unit Ambient Temperature Estimation Without Sensors
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Solution Overview
Problem
Existing vehicle control systems rely on ambient temperature sensors, which increase vehicle cost and complicate wiring.
Innovation Solution
An ambient temperature determination method using motor, battery, and coolant temperature values within an MCU, calculating ambient temperature without a dedicated sensor by averaging initial values and applying temperature differences and calibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an ambient temperature sensor is mounted on the vehicle body to collect ambient temperature, then the ambient temperature can be obtained for vehicle control, but the vehicle cost increases and the vehicle wiring becomes more complex
Solution Approach 1:
The MCU uses its existing internal temperature sensor to measure temperatures of motor system components (motor, battery, coolant) and calculates ambient temperature from these measurements, making the MCU serve dual purposes and eliminating the need for a separate ambient temperature sensor
Solution Approach 2:
The MCU's internal temperature sensor, originally designed for monitoring motor system temperatures, is repurposed to also determine ambient temperature, allowing one component to perform multiple measurement functions
2Measurement precision
If an ambient temperature sensor is mounted on the vehicle body to collect ambient temperature, then the ambient temperature can be obtained for vehicle control, but the vehicle cost increases
Solution Approach 1:
The MCU uses its existing internal temperature sensor to measure temperatures of motor system components (motor, battery, coolant) and calculates ambient temperature from these measurements, making the MCU serve dual purposes and eliminating the need for a separate ambient temperature sensor
Solution Approach 2:
Instead of directly measuring ambient temperature with a dedicated sensor, the system copies the measurement approach by using the MCU's existing temperature sensor to measure related parameters (component temperatures) and derives ambient temperature through calculation
Data Source
AI summary
A motor control unit, a control system, and a storage medium. The method of the present invention is applied to the motor control unit and comprises: when a vehicle is in a high-voltage power-on state, obtaining a plurality of effective temperature values for the same motor system; determining a corresponding initial temperature value according to each effective temperature value; determining the minimum value among all calculated initial temperature values as an initial environment temperature; when the vehicle is in a driving state and each initial temperature value is less than or equal to respective corresponding threshold, and the current temperature of a motor no longer rises, calculating differences between the current temperature of the motor and the corresponding initial temperature value and between the current temperature of a cooling liquid and the corresponding initial temperature value; calculating a temperature calibrate amount for the environment temperature according to the calculated differences.