Automatic Transmission Control Apparatus Sensor Fault Detection
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Solution Overview
Problem
Conventional automatic transmission control apparatuses cannot accurately determine which sensor is abnormal when a fault occurs, leading to difficulties in operating the actuator and ensuring correct gear position.
Innovation Solution
The apparatus includes a control unit that monitors detection signals from a motor rotation angle detection unit, an output axle rotation angle detection unit, and a position sensor, determining which signal does not coincide with the others to identify abnormalities and control the automatic transmission accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors are used for detection, then the reliability of the system is improved, but the ability to identify which sensor is abnormal deteriorates
Solution Approach 1:
The control unit continuously monitors detection signals from multiple sensors and compares their outputs. When a sensor abnormality occurs, the system uses feedback from the remaining normal sensors to identify which sensor is abnormal through signal comparison and logical analysis, thereby maintaining both system reliability and abnormality identification capability
Solution Approach 2:
The control unit acts as an intermediary that receives detection signals from multiple sensors, processes them through comparison and analysis, and determines sensor normality. This intermediary processing enables the system to identify abnormal sensors while maintaining reliable operation based on normal sensor data
2Productivity
If processing continues using remaining normal sensors when one sensor is abnormal, then the automatic transmission can still be controlled, but the precision of determining the correct gear position deteriorates
Solution Approach 1:
The control unit uses feedback signals from multiple sensors to continuously verify gear position. By comparing detection signals and analyzing their consistency, the system maintains precise gear position determination even when one sensor is abnormal, while ensuring continuous transmission control operation
Solution Approach 2:
The system performs preliminary analysis of detection signals to identify sensor abnormalities before they significantly impact gear position determination. This preliminary detection allows the control unit to switch to using only normal sensors for precise position control, maintaining both continuity and precision
Data Source
AI summary
There is obtained an automatic transmission control apparatus that makes it possible that even when an abnormality occurs in a sensor for detecting a motor rotation angle or the like, control of an automatic transmission is appropriately performed. Inputted first, second, and third detection signals are compared with one another; it is determined that at least two detection signals, out of these detection signals, that coincide with each other are normal and another detection signal is abnormal; then, based on the result of the determination, switching of the ranges of the automatic transmission is controlled.