Vehicle Seat Slide Position Detection Device
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Solution Overview
Problem
Existing seat slide position detection devices for vehicles, particularly those using magnetic sensors, face interference issues with electric sliding seat mechanisms and are not effectively applicable to electric sliding seat devices due to sensor placement within the rail structure.
Innovation Solution
A seat slide position detection device is designed with a position sensor placed between the upper rail and a vertical wall portion of the lower rail, allowing the sensor to detect the seat position without interference from internal components, and featuring protection plates to prevent foreign substances from adhering or entering, ensuring accurate detection and protection from external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the position sensor is disposed inside the upper rail, then the detection precision is improved, but the sensor interferes with the motor and ball screw mechanism provided inside the upper rail
Solution Approach 1:
The position sensor is extracted from the interior space of the upper rail and mounted on its exterior surface. This relocation eliminates the interference with the motor and ball screw mechanism while maintaining the sensor's ability to detect the locking plate position through its detection surface facing the side surface of the locking plate.
2Object-affected harmful factors
If the position sensor is disposed outside the upper rail, then the interference with internal components is avoided, but the detection precision deteriorates due to increased distance from the detection target
Solution Approach 1:
The sensor is positioned at a specific location on the exterior of the upper rail where the detection surface can face the side surface of the locking plate. This localized positioning ensures optimal detection precision while maintaining exterior mounting to avoid interference with internal components.
3Ease of operation
If the sensor is exposed without protection, then the detection function is maintained, but foreign substances may adhere to or enter the sensor causing failure
Solution Approach 1:
A protection cover is provided that surrounds the position sensor. This cover acts as a barrier preventing foreign substances from adhering to or entering the sensor, while maintaining the sensor's detection function through appropriate design that allows detection signals to pass through or around the cover structure.
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 enables accurate detection of seat position, prevents interference with electric sliding mechanisms, and effectively protects the sensor from foreign substances, enhancing the device's applicability to electric sliding seat systems and ensuring reliable operation.
Implementation Method 1
a proximity sensor (corresponding to the position sensor of the present application) is provided inside the upper rail as a position detection device. Further, the proximity sensor has a detection surface facing a side surface of a locking plate provided inside the lower rail. The proximity sensor detects the side surface of the locking plate
Data Source
AI summary
A seat slide position detection device for a vehicle includes a lower rail attached to a vehicle floor. The lower rail has one side and another side opposite to the one side in the width direction. The one side includes a side surface and an upward wall portion extending upward along the side surface. An upper rail is supported by the lower rail and slidable with respect to the lower rail in the longitudinal direction of the lower rail. A detection target portion is provided in the upward wall portion of the lower rail in a predetermined range in the longitudinal direction of the lower rail. A position sensor is disposed at the upper rail between the upper rail and the upward wall portion to face the detection target portion.