Dual-Motor Vehicle Control for Cold Speed Reducer Efficiency
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Solution Overview
Problem
Existing vehicle systems with multiple motors face inefficiencies in energy management, particularly when speed reducers' temperatures drop, leading to increased energy loss and inefficiency.
Innovation Solution
A control system that prioritizes driving the second motor with lower maximum driving force over the first motor when the temperature of the speed reducers is lower than a predetermined threshold, and adjusts cooling strategies to maintain optimal operating temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the motor on the low-temperature side is selected and run to reduce temperature difference, then the temperature difference between motors is reduced, but energy efficiency deteriorates
Solution Approach 1:
The control device changes the operating parameters by selecting which motor to operate based on both temperature and efficiency characteristics. Instead of always selecting the low-temperature motor, the system dynamically adjusts the selection criterion to balance temperature management with energy efficiency, considering the specific operating conditions and motor characteristics.
2Temperature
If the motor on the high-temperature side is stopped to allow cooling, then temperature balance is improved, but productivity deteriorates
Solution Approach 1:
The system dynamically switches between different motor selection strategies based on real-time operating conditions. When one motor needs cooling, the control device can switch to the other motor if it meets the efficiency criteria, maintaining productivity while managing temperature. This dynamic adaptation allows the system to respond flexibly to changing thermal and performance requirements.
3Power
If the first motor with greater maximum driving force is driven, then power output is improved, but energy loss increases when speed reducer temperature is low
Solution Approach 1:
The control device changes the selection parameter from purely power-capability based to temperature-aware power management. When the speed reducer temperature is below the threshold, the system prioritizes the second motor even though it has lower maximum driving force, to avoid the excessive energy loss in the cold speed reducer. This parameter change in selection criteria resolves the contradiction between power output and energy efficiency.
Data Source
AI summary
The vehicle includes a first motor that applies a driving force to the first wheel via the first speed reducer, a second motor that applies a driving force to the second wheel via the second speed reducer, and a control device that controls the driving force of the first motor and the driving force of the second motor. A maximum driving force that is outputtable by the first motor is greater than a maximum driving force that is outputtable by the second motor. When a temperature parameter correlated with a temperature of the first speed reducer and a temperature of the second speed reducer is lower than a predetermined temperature, the control device drives the second motor with priority over the first motor.