Vehicle Opening-Closing Body Control Device Free Running Brake
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Solution Overview
Problem
Existing opening-closing body control devices for vehicles, such as sunroof devices, do not adequately prevent vibration and sound during the stopping process due to inertia and loaded movement, which affects ride quality.
Innovation Solution
The control device sets a free running period after drive control is stopped, allowing free rotation of the motor, followed by regenerative brake control to generate a braking force, thereby reducing the moving speed of the opening-closing body and preventing vibration and sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If brake control is executed immediately when drive control is stopped, then the stopping response is improved, but vibration and sound are generated due to inertia and loaded movement
Solution Approach 1:
The control device performs preliminary action by setting a free-running period before executing brake control. During this period, the motor is allowed to coast freely without immediate braking, which prevents sudden inertial effects and loaded movement that cause vibration and sound. This preliminary free-running phase prepares the system for smoother subsequent braking.
Solution Approach 2:
The free-running period acts as a cushioning phase that absorbs the inertial energy of the motor and opening-closing body before brake control is applied. By allowing the motor to coast freely for a predetermined period, the system cushions the transition from driving to braking, preventing the harmful vibration and sound that would occur with immediate braking.
2Object-generated harmful factors
If a free running period is set before brake control, then vibration and sound are prevented, but the stopping time is increased
Solution Approach 1:
The control device applies partial action by setting the free-running period to a predetermined appropriate length rather than allowing unlimited free coasting. This predetermined period is sufficient to prevent vibration and sound but is optimized to not excessively extend the stopping time, balancing comfort with efficiency.
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 configuration ensures gentle loaded movement, reduces moving speed based on sliding resistance, and effectively prevents vibration and sound during the stopping process, enhancing ride quality by allowing appropriate timing for brake control based on moving distance or elapsed time.
Implementation Method 1
a motor serving as a drive source
Implementation Method 2
executes brake control for generating a braking force in the motor
Data Source
AI summary
An opening-closing body control device for a vehicle includes: an opening-closing control unit configured to control an operation of an opening-closing body provided in an opening portion of a vehicle by controlling energization of a motor serving as a drive source. When the opening-closing body being moved based on a driving force of the motor is to be stopped, the opening-closing control unit sets a free running period during which free rotation of the motor is allowed, and executes brake control for generating a braking force in the motor after the free running period elapses.