Adaptive Ignition Advance Correction for Engine Knocking
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Solution Overview
Problem
Existing methods for adjusting ignition advance in spark-ignition engines are distorted by variations in engine speed, leading to inaccurate adaptive corrections and potential knocking issues, especially when using degraded fuel.
Innovation Solution
A method that records the number of cycles and corresponding curative corrections, calculates an adaptive correction by averaging these values, and triggers the calculation task based on a variable number of cycles defined by engine speed, allowing for precise averaging and comparison with a theoretical value to determine necessary corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the adaptive correction calculation averages curative corrections over a fixed period without considering engine speed variations, then the calculation is simple to implement, but the accuracy of the adaptive correction is distorted and unreliable
Solution Approach 1:
The patent applies the Dynamics principle by making the averaging period dynamic rather than fixed. The calculation adapts to varying engine speeds by adjusting the number of cycles considered in the average, ensuring accurate adaptive correction values regardless of whether the engine is running at high or low RPM. This resolves the contradiction by sacrificing simple fixed-period implementation for dynamically adapted accuracy.
2Productivity
If the engine operates at high RPM, then more curative corrections are recorded in the same time period, but the average calculation becomes distorted and may wrongly trigger adaptive correction
Solution Approach 1:
The patent applies the Parameter changes principle by modifying the parameters used in averaging calculations based on engine operating conditions. Specifically, the system adjusts the number of cycles to average based on the detected engine speed, preventing distortion from high-RPM operation while ensuring reliable adaptive correction triggering only when genuinely needed.
3Productivity
If the engine operates at low RPM, then fewer curative corrections are recorded in the same time period, but the average calculation lacks sufficient data for reliable adaptive correction
Solution Approach 1:
The patent applies the Dynamics principle by making the averaging period dynamic rather than fixed. The calculation adapts to varying engine speeds by adjusting the number of cycles considered in the average, ensuring accurate adaptive correction values regardless of whether the engine is running at high or low RPM. This resolves the contradiction by sacrificing simple fixed-period implementation for dynamically adapted accuracy.
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 provides a reliable and accurate calculation of adaptive corrections, ensuring precise ignition advance adjustments across varying engine speeds and transient phases, effectively reducing knocking and maintaining engine performance.
Implementation Method 1
detection of knocking by sensor (for example piezoelectric sensor)
Data Source
Figure 1~2
Figure 3
AI summary
Method for adjusting the ignition advance, controlled by a computer (10), of an internal combustion engine (2) comprising at least one cylinder (3), this method involving the operations consisting, in the case of the computer (10), in: • - recording a number of cycles performed in the cylinder and the value of an ignition advance curative correction for each cycle, and • - calculating an ignition advance adaptive correction during which the computer (10) averages the curative correction value as a function of the number of cycles elapsed and then calculates an adaptive correction value on the basis of this average, the triggering of the task of calculating the adaptive correction occurring when a predefined number of cycles has been reached. This number may be variable and dependent on the engine operating speed.