Vehicle Door Motor Voltage Control for Temperature Variations
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Solution Overview
Problem
Existing open-close body controllers in vehicles, such as power window systems, experience decreased full-closing performance due to external temperature variations, leading to motor overheating and insufficient sliding.
Innovation Solution
An open-close body controller that adjusts the voltage supplied to the motor unit based on outside temperature, providing higher voltage when temperatures deviate from normal to maintain performance, and eliminating voltage control in extreme temperatures to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage control is executed to adjust moving speed during closing action, then the full-closing performance is improved under normal temperature, but the motor unit overheats and sliding becomes insufficient under deviated temperature conditions
Solution Approach 1:
The control unit dynamically adjusts the voltage supplied to the motor unit based on the outside temperature. When the outside temperature is below the reference temperature, the control unit increases the voltage to compensate for reduced motor efficiency in cold conditions, thereby maintaining full-closing performance without causing overheating.
Solution Approach 2:
The control unit changes the operating parameters (voltage level) of the motor unit according to the outside temperature. By supplying higher voltage when temperature is low and normal voltage when temperature is normal, the system adapts to environmental conditions and maintains reliable operation across different temperature ranges.
2Reliability
If higher voltage is supplied to the motor unit when outside temperature deviates from normal, then the full-closing performance is maintained, but the power consumption increases
Solution Approach 1:
The control unit changes the voltage parameter based on outside temperature conditions. Higher voltage is supplied only when necessary (below reference temperature) to maintain full-closing performance, while normal voltage is used under normal temperature conditions to minimize power consumption.
Solution Approach 2:
The control unit applies excessive voltage (higher than normal) only partially - specifically when the outside temperature is below the reference temperature. This partial application of excessive voltage maintains performance when needed while avoiding unnecessary power consumption during normal temperature operation.
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 solution ensures consistent full-closing performance across varying temperatures by supplying higher voltage to the motor unit when outside temperatures are abnormal, preventing overheating and maintaining efficient operation.
Implementation Method 1
The control unit executes a normal temperature voltage control that adjusts a speed of the open-close body by controlling a voltage supplied to the motor unit
Data Source
AI summary
An open-close body controller includes a control unit that controls a motor unit to open and close an open-close body arranged on a vehicle door between a fully closed position and a fully open position. The control unit executes a normal temperature voltage control that adjusts a speed of the open-close body by controlling a voltage supplied to the motor unit during a closing action when an outside temperature is a normal temperature and supplies the motor unit with a higher voltage than that in the normal temperature voltage control when the outside temperature is deviated from the normal temperature.