Exhaust Sensor Light-Off Calibration for Cold Start Accuracy
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Solution Overview
Problem
Exhaust gas sensors experience unstable and inaccurate measurements during the cold start of a motor vehicle due to the time it takes for components to warm up to operating temperatures, leading to sensor signal variability that renders the sensor unusable until light-off occurs.
Innovation Solution
Incorporating a coded indication of sensor light-off response specific to each sensor, which is transmitted to an engine control unit, allowing for calibration data adjustment to correct signal degradation and reduce light-off time, enabling accurate sensing during warm-up and earlier diagnostics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the sensor is used during cold start operation, then the sensor can provide measurements earlier in the vehicle drive cycle, but the sensor signal is unstable and inaccurate during warm-up before light-off
Solution Approach 1:
The sensor includes a coded indication of its light-off response characteristics that are determined before the sensor is installed in the vehicle. This preliminary characterization allows the control system to apply appropriate corrections during warm-up operation, enabling accurate measurements earlier in the drive cycle without compromising measurement precision
Solution Approach 2:
The invention changes the parameter of sensor response characteristics by incorporating coded indication data that represents the sensor's light-off behavior. This coded data is used to adjust and correct sensor signals during warm-up, transforming the unusable early sensor output into accurate measurements
2Manufacturing precision
If manufacturing processes are optimized to maintain low sensor variation at light-off, then sensor performance upon reaching light-off is improved, but sensor to sensor variation significantly impacts sensor response during light-off time
Solution Approach 1:
The sensor includes a coded indication of its specific light-off response characteristics that feedback to the control system. This feedback mechanism allows the system to compensate for manufacturing variations in each individual sensor, improving reliability during warm-up operation while maintaining the manufacturing precision achieved at light-off
Solution Approach 2:
The invention applies local quality by providing sensor-specific coded indication data that is unique to each sensor's light-off characteristics. This individualized approach allows each sensor to be optimized and corrected according to its specific manufacturing variations, improving overall reliability during warm-up
Data Source
AI summary
Various systems and methods are described for controlling operation of a motor vehicle based on a sensor. One example method comprises receiving sensed parameter data from the sensor, receiving calibration data from the sensor, and adjusting a vehicle operating parameter in response to the sensed parameter data and the calibration data.