Vehicular Opening Control Device Heat Management
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Solution Overview
Problem
Existing vehicular opening/closing body control devices face limitations in maintaining braking control due to heat generation issues when using phase-locked conduction control, which restricts the duration of braking force application.
Innovation Solution
A vehicular opening/closing body control device and motor control device that switch the conduction phase used for phase-locked conduction control at predetermined times to disperse heat generation and prevent overheating, allowing for stable continuous braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If phase-locked conduction control is used to apply braking force to the opening/closing body, then the braking force can be effectively applied and movement speed can be reduced, but the motor coil or drive circuit switching element generates heat which limits the duration of braking control
Solution Approach 1:
The patent implements periodic switching of the conduction phase in the motor drive circuit. By alternating between different conduction phases at predetermined intervals, the system distributes heat generation across multiple switching elements rather than concentrating it in a single element, thereby enabling sustained braking control without excessive heat accumulation in any one component.
2Duration of action of moving object
If phase-locked conduction control is maintained for extended periods, then stable braking force can be applied, but the duration is limited due to heat generation in the motor coil or drive circuit switching element
Solution Approach 1:
The control device periodically switches the conduction phase of the motor drive circuit at predetermined time intervals. This periodic switching distributes the operational load and heat generation across multiple switching elements over time, allowing the braking control to be maintained for extended durations without any single element exceeding thermal limits.
3Device complexity
If a single conduction phase is locked for braking control, then the control mechanism is simple, but the braking control duration is limited due to heat generation
Solution Approach 1:
The patent introduces periodic switching of conduction phases while maintaining a relatively simple control structure. The control device monitors the elapsed time of phase-locked conduction control and switches to a different conduction phase when the predetermined time elapses, thereby extending braking control duration without significantly increasing system complexity.
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
The solution enables extended and stable braking control by periodically switching the conduction phase, reducing heat generation and maintaining the opening/closing operation position effectively.
Implementation Method 1
a braking control unit configured to apply a braking force to an opening/closing body by supplying driving power having a locked conduction phase to a motor
Implementation Method 2
a motor coil or a drive circuit switching element, which has the conduction phase, generates heat
Data Source
AI summary
A vehicular opening/closing body control device includes a braking control unit configured to apply a braking force to an opening/closing body by supplying driving power having a locked conduction phase to a motor, which is a drive source of the opening/closing body, wherein, when an execution time of phase-locked conduction control for locking the conduction phase and supplying the driving power reaches or exceeds a predetermined time, the braking control unit switches a conduction phase used for the phase-locked conduction control.