Crankshaft Angle Detection Device with Gain and Phase Calibration
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Solution Overview
Problem
Conventional angle detection systems for internal combustion engines face challenges in accurately calibrating manufacturing and mounting errors of position sensors, leading to reduced detection accuracy, especially in lean burn conditions where precise angle detection is crucial.
Innovation Solution
An angle detection device that employs a combination of a gain corrector and a phase corrector to adjust the output signals of multiple position sensors, ensuring the amplitude and phase of one sensor match those of another, thereby calibrating manufacturing and mounting errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single position sensor is used to detect crankshaft rotation angle, then the device complexity is low, but the detection accuracy is reduced due to manufacturing and mounting errors
Solution Approach 1:
The patent combines multiple position sensors (first and second position sensors) to detect the rotation angle of the crankshaft. By merging the detection results of multiple sensors and performing error calibration between them, the system achieves higher measurement precision while managing the complexity through systematic signal processing and calibration algorithms.
2Measurement precision
If multiple position sensors are used to improve detection accuracy, then the measurement precision increases, but the device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism through error calibration. The system detects the rotation angle using multiple position sensors, calculates the difference between their readings, determines calibration values based on these differences, and applies these calibration values to correct future measurements. This closed-loop feedback approach systematically reduces measurement errors while maintaining manageable device complexity.
Solution Approach 2:
The patent performs preliminary error calibration by detecting the rotation angle with multiple position sensors before actual combustion control operations. The system calculates calibration values based on the initial detection results and stores these values for subsequent use. This preliminary action prepares the system in advance, ensuring high measurement precision is achieved before critical combustion control decisions are made.
3Measurement precision
If position sensors are calibrated to improve measurement precision, then the detection accuracy improves, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent implements a self-service calibration approach where the system automatically detects the rotation angle using multiple position sensors, calculates the differences between sensor readings, determines calibration values, and applies these corrections without requiring external manual intervention. The ECU performs the entire calibration process autonomously, reducing the difficulty of error detection and measurement while improving precision.
Data Source
AI summary
A manufacturing error and a mounting error of a position sensor used for detection of a rotation angle of a rotary shaft are appropriately calibrated to improve detection accuracy of the rotation angle. Therefore, an angle detection device 1 includes at least a first crank angle sensor 1211 and a second crank angle sensor 1212 provided to be capable of detecting a rotation angle of a rotary shaft of a crankshaft 123, and includes: a gain corrector 4 that corrects at least any one of gains G1 and G2 of the first crank angle sensor 1211 and the second crank angle sensor 1212 such that an amplitude ya of a differential signal S41b of the first crank angle sensor 1211 is equal to an amplitude yb of a differential signal S42b of the second crank angle sensor 1212; and a phase corrector 5 that corrects at least any one of a phase αa of the differential signal S41b and a phase αb of the differential signal S42b such that the phase αa of the differential signal S41b is equal to the phase αb of the differential signal S42b.