Steering Motor Current Control for Battery Overheat Prevention
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Solution Overview
Problem
Steering assist devices, such as electronic power steering (EPS), face overheating issues due to increasing current supplied from the battery, which can damage components if not managed effectively.
Innovation Solution
A steering control device and method that calculate a command current based on steering information, estimate the supply current using internal resistance and battery voltage, and adjust the current to prevent overheating by comparing it with a preset reference current, thereby applying a reduced command current to the steering motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the command current applied to the motor is increased to provide larger steering assistance, then the steering assist performance is improved, but the supply current from the battery increases causing overheating and potential damage to components
Solution Approach 1:
The patent applies preliminary action by estimating the supply current before it is actually supplied to the motor. The controller calculates the internal resistance of the battery based on temperature, estimates the supply current that would result from a commanded current, and compares this estimate to a reference current threshold. If the estimated current exceeds the threshold, the controller adjusts the commanded current before application to prevent overheating. This proactive approach prevents the harmful thermal effect before it occurs.
2Reliability
If the command current is increased to improve steering assistance, then the steering performance is improved, but the risk of overheating and component damage increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the battery temperature and using this information to adjust the command current. The controller calculates internal resistance based on detected temperature, estimates supply current based on this resistance and the commanded current, and then adjusts the commanded current accordingly. This closed-loop feedback mechanism ensures that steering assistance is optimized while preventing overheating and component damage by adapting the current supply to actual thermal conditions.
Solution Approach 2:
The controller performs preliminary estimation of supply current before actual current supply occurs. By calculating the expected supply current based on commanded current and temperature-dependent internal resistance, the system can proactively adjust the command current to prevent harmful overheating effects before they manifest, thereby protecting components while maintaining reliable steering assistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach efficiently uses energy, prevents battery current oversupply, and minimizes the risk of overheating, ensuring stable steering assist and reducing the risk of component damage.
Implementation Method 1
a battery, and a steering motor to which the command current is applied
Implementation Method 2
steering assist devices, such as electronic power steering (EPS)... steers the wheels by the output of the motor generated by applying the command current to the motor
Data Source
AI summary
A steering control device and a steering control method are disclosed. Particularly, a steering control device according to the disclosure comprises: a command current calculation unit for calculating a first command current on the basis of detected steering wheel steering information; a resistance calculation unit for calculating internal resistance on the basis of a detected internal temperature; a supply current estimation unit for estimating the supply current of a battery on the basis of an input supply voltage of the battery, the first command current and the internal resistance; and a command current applying unit for comparing the supply current and a preset reference current and, if the supply current is greater than the reference current, changing the first command current to a second command current and applying the second command current to a steering motor.