Dual-Motor EV Temperature Estimation With One Sensor
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Solution Overview
Problem
Electrified vehicles require multiple motor sensors to estimate and control motor temperatures, increasing the number of parts and complexity.
Innovation Solution
A control device estimates the temperature of one motor based on detection signals from a temperature sensor of another motor, using information about the relative operation, driving force proportion, revolutions, or load, allowing for the elimination of a temperature sensor for the second motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensors are provided for both motors to enable accurate temperature estimation and control, then motor temperature control reliability is improved, but the number of parts and device complexity increases
Solution Approach 1:
The patent uses the temperature sensor from the first motor to obtain temperature data, then copies this information to estimate the temperature of the second motor through correction based on operational parameters. This allows temperature monitoring of both motors using only one physical sensor, reducing parts while maintaining control reliability
Solution Approach 2:
The control device acts as an intermediary that receives temperature sensor data from the first motor, applies correction based on operational relationships between the two motors, and generates estimated temperature data for the second motor. This intermediary processing enables temperature control without requiring a physical sensor on the second motor
2Measurement precision
If temperature sensors are provided for both motors, then measurement accuracy of motor temperatures is improved, but device complexity and cost increase
Solution Approach 1:
Instead of using two physical sensors, the system copies temperature measurement data from the first motor and adjusts it through correction calculations based on operational parameters like requested driving force proportions. This maintains measurement accuracy while simplifying the physical sensor configuration
Solution Approach 2:
The system changes the approach from direct physical measurement to indirect parameter-based estimation. By using operational parameters (requested driving force proportion, revolutions, load) to correct and transform the temperature data from the first motor, the system achieves accurate temperature estimation without additional sensors
Data Source
AI summary
The electrified vehicle includes a first motor that drives a first wheel, a second motor that drives a second wheel different from the first wheel, a temperature sensor provided for the first motor, and a control device. The control device estimates the temperature of the first motor based on the detection signal from the temperature sensor, and corrects the temperature of the first motor based on information indicating a relative relation between operation of the first motor and operation of the second motor. These processes allow the control device to estimate the temperature of the second motor, control the operation of the first motor based on the estimated temperature of the first motor, and control the operation of the second motor based on the estimated temperature of the second motor.