Premature Combustion Detection via Cylinder Pressure and Ionic Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current knocking control systems in internal combustion engines fail to detect and prevent premature combustion events, which can lead to engine damage due to their reliance on ignition angle adjustments and knocking sensors that do not recognize pressure increases caused by unburned fuel or oil deposits.
Innovation Solution
Implementing a method that uses sensors and electronic evaluation circuits to directly recognize premature combustion through monitoring cylinder pressure, ionic current signals, or acceleration signals, allowing for immediate detection and countermeasures such as reducing engine load, independent of knocking events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If knocking control systems use ignition angle adjustments and knocking sensors to control combustion, then knocking events can be reduced, but premature combustion events cannot be detected or prevented
Solution Approach 1:
The patent replaces the traditional mechanical/knock-based detection system with an electrical sensing system. Instead of relying on acoustic knocking sensors and ignition angle adjustments, the system uses electrical sensors (such as those detecting ionization current or voltage) to directly detect the electrical characteristics of combustion events, enabling detection of premature combustion before mechanical knocking occurs.
Solution Approach 2:
The patent implements preliminary detection of combustion events by monitoring electrical signals during the compression stroke, before the ignition spark is applied. By detecting ionization current or voltage changes in the combustion chamber during compression, the system can identify premature combustion events before they complete their harmful effect, allowing for preventive control actions.
2Measurement precision
If knocking sensors and signal processing systems are used to recognize knocking events, then knocking control can be achieved, but premature combustion events remain undetected despite causing strong pressure increases
Solution Approach 1:
The patent introduces an intermediary electrical sensing system between the combustion process and the control system. Instead of directly measuring mechanical knocking or pressure changes, the system uses electrical intermediaries (ionization current, voltage signals) that reflect combustion chamber conditions, providing an earlier and more reliable indicator of premature combustion events.
Solution Approach 2:
The patent implements a feedback control system that continuously monitors electrical signals from the combustion chamber and adjusts ignition timing or other combustion parameters in real-time. When premature combustion is detected through electrical signal analysis, the system provides feedback to correct the ignition timing, preventing engine damage before it occurs.
3Power
If ignition angle is adjusted to early positions to maximize power output, then engine performance improves, but the risk of premature combustion increases
Solution Approach 1:
The patent implements dynamic adjustment of ignition timing based on real-time electrical signal analysis. Instead of using fixed early ignition angles, the system continuously adapts the ignition timing within a wide range (from very early to very late positions) based on the detected electrical characteristics of the combustion process, allowing optimization of power output while preventing premature combustion.
Solution Approach 2:
The patent changes the control parameter from fixed ignition angle to dynamically adjusted ignition timing based on electrical signal characteristics. By monitoring ionization current or voltage and adjusting ignition timing accordingly, the system can operate at high power output levels while maintaining combustion stability and preventing premature combustion events.
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
Enables early and accurate recognition of premature combustion, reducing the risk of engine damage by allowing for immediate intervention and minimizing false recognitions, thus preventing engine damage and maintaining efficient operation.
Implementation Method 1
a premature combustion preferably being detected when cylinder pressure detected prior to the ignition point and/or the rise of the cylinder pressure before the ignition point exceeds a defined threshold value
Implementation Method 2
A fourth embodiment of the invention provides that a knock sensor is used as a sensor signal, with the evaluation of the sensor signal preferably occurring by a maximum evaluation process
Data Source
AI summary
A method for recognizing and avoiding premature combustion events includes the steps of:providing at least one sensor and/or an electronic evaluation circuit for recognizing premature combustion;directly recognizing premature combustion; andperforming at least one measure for avoiding premature combustion when premature combustion is recognized.