Crank Angle Correction Control Using Torque-Based Ideal Speed
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Solution Overview
Problem
Existing controllers for internal combustion engines suffer from detection errors in crank angle speed and acceleration due to manufacturing errors, and erroneous learning from ideal parameters based on varying operation conditions, leading to reduced control accuracy.
Innovation Solution
A controller that utilizes a specific crank angle sensor, gas pressure sensor, and physical model equations to estimate shaft torque, correct detection errors by adjusting correction values to align with ideal angular speeds, and improve detection accuracy through a series of units including angle information detection, correction, torque estimation, and ideal speed calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a specific crank angle sensor is used to detect crank angle and calculation is performed based on the detected value, then the detection process is simple, but detection error occurs due to manufacture error in the detected parts
Solution Approach 1:
The system calculates interval angular speed from detected crank angle values and compares it with ideal interval angular speed derived from a physical model. The detection error is corrected by adjusting correction values based on this comparison, forming a feedback loop that continuously improves measurement accuracy without changing the simple detection structure.
Solution Approach 2:
The system changes the correction values for crank angle detection based on the comparison between detected and ideal interval angular speeds. By dynamically adjusting these correction parameters, the system compensates for manufacturing errors in the detected parts while maintaining the simplicity of the original detection process.
2Adaptability or versatility
If learning is performed on the basis of ideal parameter considering operation condition and external load, then the control adapts to varying conditions, but erroneous learning occurs due to changing conditions
Solution Approach 1:
The system extracts the detection error component by comparing detected interval angular speed with ideal interval angular speed from the physical model. By separating the error component from the total detected value, the system can correct the error without being affected by varying operation conditions and external loads, preventing erroneous learning.
Solution Approach 2:
The system preliminarily calculates the ideal interval angular speed using the physical model equation before performing learning. This preliminary calculation provides a reference value that is independent of detection errors, allowing the learning process to focus only on correcting the error component rather than learning from potentially erroneous data.
3Measurement precision
If correction value is changed to align detection section angular speed with ideal interval angular speed, then detection accuracy is improved, but additional calculation and adjustment processes are required
Solution Approach 1:
The correction values are dynamically adjusted based on the comparison between detected and ideal interval angular speeds. This dynamic adjustment allows the system to adapt to varying operating conditions while maintaining a relatively simple correction process that automatically optimizes detection accuracy without requiring complex manual calibration.
Data Source
AI summary
To provide a controller for an internal combustion engine which can correct the detection error of the crank angle with good accuracy. A controller for an internal combustion engine corrects an angle interval or a time interval of an angle section by a correction value; estimates a shaft torque of a crankshaft using the physical model equation of a crank mechanism based on a detection value of a gas pressure in an intake pipe and a detected angle; calculates an ideal interval angular speed based on an estimation value of the shaft torque; and changes the correction value so that the detection section angular speed after correction approaches the ideal interval angular speed.