Suspension Displacement-Based Tire Force Sensor Fault Diagnosis
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Solution Overview
Problem
Existing tire force sensors on vehicles face challenges in detecting malfunctions without duplicating sensors, which is impractical due to cost and mountability concerns.
Innovation Solution
A force sensor diagnosis apparatus that uses a displacement sensor in the vehicle's suspension to estimate vehicle-height direction force components, allowing for malfunction detection of the tire force sensor without duplicating sensors, by comparing detected and estimated values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If another sensor is added for duplexed system to detect the same force components for malfunction detection, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The system uses the displacement sensor's existing data to diagnose the force sensor's status, making the displacement sensor serve dual purposes: monitoring suspension displacement and diagnosing force sensor malfunctions. This eliminates the need for a separate diagnostic sensor while maintaining reliability.
Solution Approach 2:
The displacement sensor is made multi-functional by using its measurement data for both original suspension monitoring and new force sensor diagnosis purposes. The same sensor hardware performs multiple functions, reducing overall system complexity while improving reliability through cross-validation capability.
2Reliability
If another sensor is added for duplexed system to detect the same force components for malfunction detection, then reliability is improved, but cost increases
Solution Approach 1:
The displacement sensor diagnoses the force sensor using its own measurement data, eliminating the need for additional sensor hardware. This self-service approach reduces component costs while maintaining the ability to detect force sensor malfunctions through comparative analysis of sensor readings.
Solution Approach 2:
Instead of physically duplicating the force sensor, the system creates a virtual copy or model of force sensor behavior using displacement sensor data and vehicle dynamics models. This computational copy enables malfunction detection without the cost of physical sensor duplication.
3Reliability
If another sensor is added for duplexed system to detect the same force components for malfunction detection, then reliability is improved, but sensor mountability becomes more difficult
Solution Approach 1:
The existing displacement sensor performs self-service by using its measurement capabilities to diagnose the force sensor. No additional sensors need to be installed, mounted, or calibrated, thereby maintaining ease of operation while achieving malfunction detection capability.
Solution Approach 2:
The displacement sensor is utilized for multiple functions including both its original suspension displacement monitoring and the new force sensor diagnosis function. This multi-functionality eliminates the need for additional installation work while achieving reliable malfunction detection through data comparison and analysis.
Data Source
AI summary
A force sensor diagnosis apparatus performs a process of diagnosing a malfunction of a force sensor to detect external force applied to a wheel of a vehicle. The force sensor diagnosis apparatus acquires, based on a sensor signal of the force sensor, a vehicle-height direction force component detection value that is a force component in a height direction of the vehicle of external force applied to the wheel, calculates a vehicle-height direction force component estimation value on the basis of a sensor signal of a displacement sensor provided in a part of a suspension of the wheel and detects a state quantity corresponding to a stroke displacement of the suspension due to external force received by the wheel from a road surface, and performs malfunction determination of the force sensor by comparing the vehicle-height direction force component detection value and the vehicle-height direction force component estimation value.