Vehicle Motor Current Control for Wheel Disturbance Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle control systems face challenges in maintaining wheel operation stability when encountering obstacles or uneven road surfaces, as the electric motor's protection control restricts current supply, potentially failing to generate sufficient torque to resist disturbances.
Innovation Solution
A vehicle control device comprising an acquisition unit for gathering traveling environment data, a situation determination unit to identify disturbances affecting wheel operations, and a suppression unit to temporarily suspend protection control restrictions on current supply to the electric motor, ensuring sufficient torque is generated to resist disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection control restricts current supply to the electric motor, then the electric motor is protected from overheating, but the electric motor cannot generate sufficient torque to resist disturbances from obstacles
Solution Approach 1:
The protection control device dynamically adjusts the current supply restriction based on the detected disturbance magnitude. When a disturbance exceeding a predetermined threshold is detected, the device temporarily relaxes or cancels the current restriction, allowing the electric motor to generate sufficient torque to resist the disturbance. This dynamic adjustment resolves the contradiction by making the protection level adaptive rather than fixed.
Solution Approach 2:
The system changes the electrical parameter (current supply limit) based on the operational conditions. The protection control device monitors disturbance levels and modifies the current restriction parameter accordingly - maintaining strict limits during normal operation for protection, and increasing or removing limits when disturbances are detected to ensure adequate torque generation.
2Force
If larger current is supplied to the electric motor to generate larger torque for resisting disturbances, then the torque capability is improved, but overheating becomes more likely occurring in the electric motor and drive circuit
Solution Approach 1:
The system dynamically controls current supply based on real-time disturbance detection. Current is increased only when and for as long as a disturbance is detected, rather than maintaining high current continuously. This temporary, condition-based current increase provides sufficient torque during disturbances while minimizing overall heat generation in the motor and drive circuit.
Solution Approach 2:
The protection control device employs periodic monitoring of disturbance conditions and adjusts current supply in response. Current is supplied at high levels only during the periodic intervals when disturbances are detected, rather than continuously, allowing the system to generate necessary torque intermittently while avoiding sustained overheating.
Data Source
AI summary
A vehicle control device includes an acquisition unit configured to acquire traveling environment information of a vehicle, a situation determination unit configured to determine whether or not a predetermined situation where a disturbance acts on a wheel such that an operation is changed has occurred, based on the traveling environment information, and a suppression unit configured to suppress restriction of protection control of protecting an electric motor by restricting a current supplied to the electric motor, in a case where the predetermined situation has occurred.