Vehicle Control Device Pinion Temperature Management
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Solution Overview
Problem
In vehicles equipped with a planetary gear mechanism and dual electric motors, the increased torque from the first electric motor during dual driving leads to elevated pinion gear temperature, potentially restricting dual driving capabilities due to inefficient operating points of the electric motors.
Innovation Solution
A control device with an electronic control unit that estimates pinion temperature and adjusts the driving force share ratio between the first and second electric motors to reduce the first motor's torque output when temperatures rise, thereby suppressing pinion temperature increases and maintaining dual driving functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the share ratio of driving force of the first electric motor is increased to enhance control flexibility and reduce load on the second electric motor, then the control flexibility is improved, but the pinion temperature increases which may cause restriction of dual driving
Solution Approach 1:
The control device dynamically adjusts the sharing ratio of driving force between the first and second electric motors based on real-time pinion temperature conditions. When pinion temperature is below a threshold, the first motor operates at higher sharing ratios for flexible control; when temperature exceeds the threshold, the control device reduces the first motor's sharing ratio to suppress temperature increase, thus adaptively resolving the contradiction between control flexibility and temperature control
Solution Approach 2:
The invention changes the operating parameters (sharing ratio) of the first electric motor based on pinion temperature conditions. By adjusting the sharing ratio parameter dynamically according to temperature feedback, the system optimizes the balance between control flexibility and thermal management of the pinion gear
2Power
If the first electric motor operates at inefficient operating points to satisfy requested driving force, then the driving force requirement is met, but the system efficiency decreases
Solution Approach 1:
The control device implements feedback control by monitoring pinion temperature and adjusting the first electric motor's sharing ratio accordingly. This feedback mechanism ensures that the first motor operates within efficient ranges while still meeting the requested driving force, preventing energy loss from inefficient operation
Data Source
AI summary
A control device for a vehicle includes an electronic control unit. The electronic control unit is configured to set a share ratio of driving force of the first electric motor and the second electric motor. The electronic control unit is configured to set the share ratio of the driving force such that when the temperature of a pinion gear in a planetary gear mechanism is higher than a specified temperature, the share ratio of the driving force of the first electric motor is lower than the share ratio when the temperature is lower than the specified temperature.