Internal Combustion Engine Pressure Signal Peak Detection
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Solution Overview
Problem
Existing methods for processing voltage signals from pressure measurement sensors in internal combustion engines are inefficient due to complex calculations, high memory usage, and calibration difficulties, leading to inaccurate detection of main pressure peaks and confusion between main and secondary peaks.
Innovation Solution
A method involving signal rectification, peak clipping, and detection using a gain coefficient to differentiate between main and secondary peaks, with adaptive gain values to accurately identify main pressure peaks and avoid unnecessary compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex calculation methods (Kalman filters) are used for signal processing, then measurement precision may be improved, but device complexity and memory usage increase significantly
Solution Approach 1:
The signal processing is divided into distinct segments: rectification phase, clipping phase, and detection phase. Each phase handles specific aspects of the signal independently, avoiding the need for complex unified algorithms like Kalman filters while maintaining detection accuracy.
Solution Approach 2:
The invention extracts only the essential features needed for peak detection by clipping the signal at a predetermined threshold. This extraction approach removes unnecessary signal components and simplifies subsequent detection without requiring complex computational methods.
2Measurement precision
If complex calculation methods are used, then measurement precision may be improved, but processing time and productivity decrease
Solution Approach 1:
By segmenting the processing into simple rectification, clipping, and detection stages, each stage can be executed rapidly with minimal computation, significantly improving processing speed compared to iterative complex algorithms.
Solution Approach 2:
The clipping operation applies a predetermined threshold to immediately cap signal values, providing sufficient information for peak detection without performing excessive calculations. This partial action approach achieves adequate precision with much higher efficiency.
3Measurement precision
If complex calculation methods are used, then measurement precision may be improved, but ease of operation and calibration difficulty increase
Solution Approach 1:
The invention extracts the essential peak information through simple clipping at a predetermined voltage threshold, eliminating the need for complex calibration procedures required by advanced filtering methods. The operation becomes straightforward and easily implementable.
Solution Approach 2:
The method uses simple, fixed threshold values that do not require adaptive calibration or complex parameter tuning. These fixed parameters are easy to set and do not change during operation, making the system highly operational and easy to implement.
4Measurement precision
If signal compensation is performed continuously, then measurement precision may be improved, but use of energy and processing resources increase
Solution Approach 1:
The processing is segmented so that compensation is only applied during plateau phases, not during peak phases. This selective approach maintains signal accuracy where needed while minimizing energy consumption by avoiding unnecessary processing during peak detection.
Solution Approach 2:
Instead of continuous compensation, the invention applies compensation only partially during plateau phases. This partial action provides sufficient accuracy for the application while significantly reducing the energy and processing resources required.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies peak detection, reduces errors, and provides a more accurate compensated signal for engine parameter management, improving the reliability and efficiency of engine control.
Implementation Method 1
A pressure measurement sensor, as is known, uses the variations of electrical charge of a sensitive piezoelectric element to provide, in a relative manner, an indication of the pressure prevailing in the cylinder
Implementation Method 2
In particular the heating of the ceramic by the heat released by the combustion of the gases in the cylinder may create a current generating an additional electrical charge in the sensor, referred to as 'pyroelectricity'
Data Source
AI summary
A method for processing a voltage signal relating to the pressure prevailing in a combustion chamber of a cylinder of an internal combustion engine, the signal, referred to as an “input signal”, having, in alternation, “plateau” phases and main peak phases. The method includes a step (E1) of rectification of the input signal such that the gradient of the base signal is zero, a step (E2) in which the peaks of the rectified signal of which the amplitude is greater than a predetermined voltage value are clipped so as to obtain an at least partially clipped signal referred to as a “clipped signal”, a step (E3) of detection of a main peak when the amplitude of the input signal is greater than the amplitude of the clipped signal, and a step (E4_1, E4_2) of compensation of the input signal in the absence of such a detection.