Vehicle Seat Motor Control Using Hall Sensor Feedback
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Solution Overview
Problem
Power seats with sequential startup control logic often experience a 'seat caught' situation due to insufficient initial current, leading to failure in sliding and moving the seat, which affects marketability and quality.
Innovation Solution
A vehicle seat control apparatus that uses a hall sensor to determine if the seat is caught, switching to maximum operation power when the sensor does not output a signal, ensuring sufficient current is supplied to move the seat, and reverting to soft start mode when the issue is resolved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If soft start mode is used to prevent mechanical shock, then the motor and mechanism are protected, but the seat cannot be moved when caught due to insufficient initial current
Solution Approach 1:
The system dynamically switches between soft start mode and maximum power mode based on seat movement feedback. When the hall sensor indicates the seat has not moved, the system transitions from protective soft start to high-power forced movement mode, enabling the seat to be freed from caught positions while maintaining mechanical protection during normal operation.
Solution Approach 2:
The control system changes the motor current parameter from limited (soft start) to maximum based on detected seat movement status. This parameter change allows the system to provide sufficient initial current to free a caught seat while maintaining protective current limits during normal operation, thus resolving the contradiction between mechanical protection and movement capability.
2Ease of operation
If maximum current is applied initially to ensure seat movement, then the seat can be freed from caught positions, but impact and rebound increase reducing component life
Solution Approach 1:
The system applies maximum current locally and temporarily only when and where needed (during caught situations detected by the hall sensor), rather than continuously. This localized application of high current frees the seat from caught positions without subjecting the mechanical components to continuous high-stress operation, thus maintaining component durability while ensuring movement capability when needed.
Solution Approach 2:
The control system uses periodic monitoring of hall sensor feedback to detect caught situations and apply maximum power only during these specific periods. Normal operation continues with protective sequential startup control. This periodic intervention approach resolves the contradiction by applying high current only when necessary to free the seat, minimizing overall mechanical stress and preserving component life.
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
Effectively solves the seat caught situation by providing maximum initial power when needed, preventing the seat from getting stuck and maintaining product competitiveness without adding new components, thus reducing costs.
Implementation Method 1
a hall sensor to determine if the seat is caught
Data Source
AI summary
The present invention relates to a vehicle seat control apparatus and a control method thereof. The present invention is based on a structure in which a hall sensor is applied to a seat motor for providing an operation power of a power seat, and a seat caught situation is judged through a sensing operation of the hall sensor and a maximum current is supplied to the seat motor in the present invention. Therefore, the present invention has an advantage of solving the seat caught situation by improving the operation mode of the seat control apparatus to which the soft start mode is applied.