Vehicle Seat Load Sensor Sensitivity Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for adjusting the sensitivity of load detecting devices in vehicle seats require multiple adjustment equipment and processes, increasing equipment and adjustment costs, and prolonging the tact time due to the need for precise calibration at both zero and rated load conditions.
Innovation Solution
A method that includes sensor assembling, seat assembling, zero point adjusting, adjusted output value calculating, trimming coefficient calculating, and trimming coefficient memorizing steps, allowing for precise load detection without the need to adjust each load sensor individually, by using a processing device to calculate and store trimming coefficients based on non-load and predetermined load outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optimal sensitivity is obtained from every load sensor through individual adjustment, then measurement precision is improved, but device complexity and adjustment cost increase
Solution Approach 1:
The patent merges the sensitivity adjustment function from individual sensor level to seat assembly level. Instead of adjusting each load sensor separately, the invention adjusts the entire seat assembly as a unified system, reducing the number of adjustment operations and equipment needed while maintaining detection precision
Solution Approach 2:
The patent creates a universal adjustment approach where a single trimming coefficient can be applied to multiple load sensors within the seat assembly. This multi-functional coefficient handles sensitivity variations across different sensors without requiring individual sensor-specific adjustments
2Productivity
If multiple adjustment equipment are used to adjust tact time, then productivity is improved, but equipment cost increases
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing trimming coefficients in memory during the adjustment phase. This allows the system to quickly retrieve and apply pre-determined correction values during actual operation, eliminating the need for multiple adjustment equipment to maintain short tact times
3Ease of manufacture
If trimming coefficient is calculated and stored in memory, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the processing device to automatically calculate and store trimming coefficients without requiring complex external adjustment equipment. The system uses its own computational resources to perform the adjustment, simplifying the manufacturing process while adding minimal complexity to the processing device
Data Source
AI summary
A method for adjusting sensitivity of a load detecting device of a seat for a vehicle includes a seat assembling step for assembling the seat with plural load sensors assembled, a zero point adjusting step for obtaining a non-load output value by totaling output values of the load sensors when no load is applied on the seat and memorizing the non-load output value in a memory of a processing device, an adjusted output value calculating step for obtaining an adjusted output value by subtracting the non-load output value from a total of the output values of the load sensors when a predetermined load is applied on the seat, a trimming coefficient calculating step for calculating a trimming coefficient by dividing a designed output value by the adjusted output value, and a trimming coefficient memorizing step for memorizing the trimming coefficient in the memory of the processing device.