Vehicle Sensor Offset Calibration via Event-Triggered Scheduling
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Solution Overview
Problem
Vehicle components often fail to calibrate properly due to circumstances like low voltage, high rotation speed, or low phase current, leading to false readings or inability to measure sensor offsets, which can result in 'limp home' or 'fail' modes affecting the driving experience.
Innovation Solution
A system and method that utilize a control processor to detect events like key-off and key-on, execute procedures to measure sensor offsets, and schedule subsequent procedures based on successful or unsuccessful measurements, including retry mechanisms and fault code settings to ensure calibration despite interfering circumstances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single calibration procedure is executed, then the calibration process is simple, but the calibration may fail due to interfering circumstances like low voltage or high rotation speed
Solution Approach 1:
The system performs preliminary actions by detecting specific events (key-on, key-off) and proactively scheduling calibration procedures before interference occurs. The control processor monitors system conditions and initiates calibration at optimal moments, preventing calibration failures due to voltage drops or high rotation speeds that would occur during operation.
Solution Approach 2:
The system implements periodic calibration by scheduling procedures at regular intervals based on detected events. The control processor alternates between first procedures (key-off events) and second procedures (key-on events), ensuring calibration occurs periodically without requiring continuous system shutdown or complex real-time intervention.
2Productivity
If calibration is performed during vehicle operation, then productivity is maintained, but measurement precision deteriorates due to low voltage or high rotation speed
Solution Approach 1:
The system schedules calibration procedures at predetermined events (key-on, key-off) before the vehicle enters conditions that would compromise measurement precision. By performing calibration at these specific transition moments, the system ensures accurate sensor offset measurement while minimizing disruption to overall vehicle productivity and operation continuity.
3Reliability
If the system enters fail mode due to calibration failure, then safety is improved, but ease of operation deteriorates due to limp home mode
Solution Approach 1:
The system performs preliminary calibration checks and scheduling before fail conditions occur. By proactively detecting events and scheduling calibration procedures in advance, the system prevents calibration failures that would trigger fail-safe modes, thereby maintaining both safety and normal driving experience without unnecessary restrictions.
Solution Approach 2:
The control processor continuously monitors calibration status and system conditions, providing feedback to determine whether to schedule additional calibration procedures. This feedback mechanism ensures that calibration is performed only when necessary and when conditions are favorable, avoiding unnecessary fail-mode activations while maintaining safety and operational quality.
Data Source
AI summary
A method includes detecting a first event and executing a first procedure to identify a sensor offset in response to detecting the first event. The method further includes determining, via a computing device, whether the sensor offset was measured during the execution of the first procedure, scheduling a second procedure to execute in response to detecting a second event if the sensor offset was not measured during the first procedure, and scheduling the first procedure to execute in response to detecting a subsequent occurrence of the first event if the sensor offset was measured during the first procedure.