Engine Combustion Control Dynamic Sampling Rate Adjustment
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Solution Overview
Problem
Current engine combustion control methods face challenges with high calculation time loads and increased system costs due to the use of a 51.2 kHz sampling vibration frequency rate, which limits practical application and requires high-end central processing units.
Innovation Solution
The method involves determining engine running conditions to adjust the sampling vibration frequency rate, performing Wavelet processing on selected frequency bands, and updating fuel injection parameters to estimate combustion factors such as Peak Pressure and Heat Release Ratio, thereby reducing the sampling frequency rate by 50% and lowering calculation time loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high sampling vibration frequency rate of 51.2 kHz is used to estimate combustion factors in the generally operating region, then the combustion factor estimation accuracy is improved, but the calculation time load increases significantly
Solution Approach 1:
The patent dynamically adjusts the sampling vibration frequency rate based on engine operating conditions. In the generally operating region, it uses a high sampling rate of 51.2 kHz to ensure accurate combustion factor estimation, while in other regions it reduces the sampling rate to decrease calculation time load. This dynamic adaptation resolves the contradiction by optimizing the trade-off between measurement precision and computational efficiency according to actual operating needs.
Solution Approach 2:
The patent changes the sampling vibration frequency rate parameter according to engine operating conditions. By setting different sampling rates (51.2 kHz for generally operating region, lower rates for other regions) and adjusting the frequency band selection based on engine RPM and load, it achieves accurate combustion factor estimation when needed while reducing calculation burden during transient or partial load conditions.
2Measurement precision
If a high sampling vibration frequency rate of 51.2 kHz is used to estimate combustion factors, then the combustion factor estimation accuracy is improved, but the system implementation cost increases due to requiring high-end CPU
Solution Approach 1:
The patent implements dynamic adjustment of sampling frequency based on engine operating conditions, using high sampling rate (51.2 kHz) only in the generally operating region where accurate combustion factor estimation is critical, and reducing the sampling rate in other regions. This dynamic strategy maintains measurement precision when needed while significantly reducing the computational burden and system implementation cost for overall engine operation.
Solution Approach 2:
The patent changes the sampling vibration frequency rate parameter according to engine operating conditions, setting it to 51.2 kHz for the generally operating region and lower values for other regions. This parameter adaptation allows the system to achieve accurate combustion factor estimation in critical operating conditions while using more economical processing resources during transient or partial load conditions, thereby reducing overall system cost.
3Reliability
If a high sampling vibration frequency rate is used to estimate combustion factors regardless of engine running condition, then the combustion robustness control is maintained, but the calculation time load increases making practical application difficult
Solution Approach 1:
The patent dynamically adjusts the sampling vibration frequency rate based on engine operating conditions to maintain combustion robustness control while reducing calculation time load. In the generally operating region, it uses high sampling rate (51.2 kHz) to ensure reliable combustion factor estimation for robust control, while in other regions it reduces the sampling rate appropriately, achieving a balance between reliability and computational efficiency for practical application.
4Measurement precision
If a high sampling vibration frequency rate is used to estimate combustion factors, then the combustion factor estimation is accurate across all operating regions, but the device complexity increases due to requiring high-end CPU and additional system configuration
Solution Approach 1:
The patent implements dynamic adjustment of sampling frequency and frequency band selection based on engine operating conditions. By using high sampling rate (51.2 kHz) and appropriate frequency bands only in the generally operating region, and reducing these parameters in other regions, it maintains accurate combustion factor estimation where needed while simplifying the computational requirements and system configuration for overall operation.
Solution Approach 2:
The patent changes the sampling vibration frequency rate and frequency band parameters according to engine operating conditions. This parameter adaptation allows the system to achieve accurate combustion factor estimation in critical operating conditions while using more economical processing resources during transient or partial load conditions, thereby reducing device complexity and system configuration requirements.
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 enables stable combustion and noise control while significantly reducing system implementation costs and CPU load, maintaining high combustion robustness and estimation performance even at lower sampling frequencies.
Implementation Method 1
measuring a vibration value from a vibration sensor mounted to an engine block side
Implementation Method 2
estimating, as combustion factors, a Location of Peak Pressure and an ignition start point by using Wavelet analysis (for example, Wavelet: an example of a signal processing technology that decomposes a signal into different frequency partial regions) for a signal in a frequency band
Data Source
AI summary
An engine combustion control method may include: determining, by a controller, whether a fuel injection timing of an engine matches with an engine running condition of the engine; performing, by the controller, when the fuel injection timing matches with the engine running condition of the engine, a fuel injection variable establishment control (or a variable control of a fuel injection timing) that performs a Wavelet process on a frequency band selected by matching a vibration frequency of a vibration sensor signal to an engine frequency transformed under an engine running condition; and when the fuel injection timing matches with the engine running condition, updating a fuel injection parameter by correcting a target value of a combustion factor based on the fuel injection timing.