Vehicle Longitudinal Acceleration Sensor Good Check Controller
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Solution Overview
Problem
Current vehicle systems lack the ability to automatically determine when a sensor malfunction, caused by factors like electromagnetic interference, has resolved, requiring manual intervention for clearance.
Innovation Solution
A controller with a malfunction monitoring module, failure handling module, and signal checking module that performs a 'good check' on sensors to verify their return to normal operation, using drive cycle information and signal filtering to reset systems and deactivate warning lights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual intervention is required to clear sensor malfunctions, then system reliability is improved by avoiding false resets, but ease of operation deteriorates due to requiring technician access
Solution Approach 1:
The system performs self-diagnosis and automatic reset of sensor malfunctions. The controller continuously monitors sensor signals and automatically clears malfunction flags when the sensor returns to normal operation, eliminating the need for manual technician intervention while maintaining reliable malfunction detection
Solution Approach 2:
The system implements continuous feedback monitoring of sensor signals against threshold criteria. When sensor readings return within acceptable ranges, the system automatically detects this through the monitoring feedback loop and triggers system reset, creating a closed-loop self-correcting mechanism
2Measurement precision
If tolerance thresholds are tightened to avoid false good checks, then measurement precision is improved, but productivity deteriorates due to extended monitoring time
Solution Approach 1:
The system pre-establishes multiple threshold criteria (first threshold for malfunction detection, second threshold for good check) before monitoring begins. These predetermined thresholds enable rapid comparison against sensor readings without requiring complex real-time calculations, achieving both precision and speed
Solution Approach 2:
The system applies different threshold stringency at different stages: stricter thresholds during initial malfunction detection to ensure reliability, then relaxed thresholds during good check phase to enable faster recovery. This staged approach balances precision requirements with productivity needs
3Reliability
If continuous monitoring is performed to detect sensor recovery, then reliability is improved by ensuring true recovery, but use of energy deteriorates due to constant signal checking
Solution Approach 1:
The controller performs monitoring at periodic intervals rather than continuously. The system checks sensor signals at defined monitoring points during operation, sufficient to detect recovery events while allowing power management modes between checks, reducing overall energy consumption while maintaining reliable detection
Solution Approach 2:
The monitoring intensity dynamically adjusts based on system state. During normal operation and recovery phases, monitoring occurs at standard intervals. When malfunctions are detected or during critical operations, monitoring frequency increases to ensure reliable detection, then returns to lower intensity when stable
Data Source
AI summary
A controller for indicating whether a previously-detected, acceleration-sensor malfunction no longer exists. The controller includes an electronic memory and an electronic processing unit connected to the electronic memory. The electronic processing module includes a malfunction monitoring module, a failure handling module, and a signal checking module. The signal checking module performs a signal check after the malfunction monitoring module generates the fault signal. The signal check includes executing a signal check function with a longitudinal acceleration signal. Also disclosed is a vehicle including the controller, and a method executed by the controller.