Pre-Ignition Safety Path Control for Faulty Engine Detection
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Solution Overview
Problem
Existing methods for detecting pre-ignition in internal combustion engines are inadequate in preventing engine damage when faulty hardware is present, as they may initiate incorrect countermeasures due to erroneous signal detection.
Innovation Solution
A method and device that activate a safety path to interrupt normal connections to the engine, ensuring measures are taken to prevent pre-ignition by lowering combustion chamber temperature through fuel enrichment, air enrichment, or reducing charge, even if clear measurement signals are absent, and include a diagnosis to detect faults in sensors and signal evaluation devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pre-ignition detection system uses sensor signals to detect uncontrolled combustion and initiate countermeasures, then pre-ignition can be detected and addressed, but engine damage may occur due to incorrect detection results when hardware faults are present
Solution Approach 1:
The patent divides the control system into two separate functional paths: a normal operational path for standard pre-ignition detection and countermeasure initiation, and a safety path that is activated when faults are detected. This segmentation ensures that faulty sensor signals cannot trigger incorrect countermeasures, as the safety path independently monitors system integrity and overrides the normal path when necessary, thereby preventing engine damage while maintaining detection capability.
Solution Approach 2:
The patent introduces a diagnostic evaluation unit as an intermediary between the sensor signal acquisition and the countermeasure initiation. This intermediary component analyzes the plausibility of sensor signals and system state before allowing countermeasures to be executed. By inserting this intermediary layer, the system verifies detection accuracy and prevents false countermeasures from causing engine damage, thus resolving the contradiction between detection reliability and harm prevention.
2Reliability
If the system continuously monitors sensor signals and system state for fault detection, then detection reliability improves, but system complexity increases
Solution Approach 1:
The control unit performs multiple functions: it acts as both the pre-ignition detection controller and the diagnostic evaluation system. By integrating these functions into a single control unit rather than adding separate dedicated diagnostic hardware, the system achieves continuous monitoring and fault detection capabilities while minimizing the increase in overall system complexity. The control unit leverages existing processing resources to perform diagnostic evaluations, thus improving reliability without proportionally increasing device complexity.
3Object-affected harmful factors
If the safety path interrupts normal connections to the engine to prevent pre-ignition, then engine protection is ensured, but normal operational efficiency may be reduced
Solution Approach 1:
The system dynamically switches between the normal operational path and the safety path based on real-time diagnostic evaluation of sensor signals and system state. When no faults are detected, the normal path operates to maintain optimal engine efficiency. When faults are detected, the system dynamically transitions to the safety path to prevent engine damage. This dynamic adaptation allows the system to prioritize efficiency during normal operation while ensuring protection when necessary, resolving the contradiction between protection and productivity.
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 reliably prevents pre-ignition by ensuring that measures are always taken to lower combustion chamber temperatures, thereby reducing the risk of engine damage, even in faulty detection scenarios, by activating a separate safety path that prioritizes engine protection.
Implementation Method 1
These vibrations are detected by knock sensors (structure-borne sound sensors) and taken into account in the control of the combustion engine
Implementation Method 2
The combustion is initiated by the spark from a spark plug. The spark creates a flame front that spreads throughout the combustion chamber
Implementation Method 3
converting the fuel-air mixture into kinetic energy during combustion
Data Source
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AI summary
The invention relates to a method for setting an emergency operational mode in a system which detects pre-ignitions in a combustion engine and which contains errors. The system consists of at least one sensor (17) and/or at least one sensor cable (24) and/or a sensor signal evaluation device (20), and is subject to a diagnosis to detect an error. In order to prevent damage to the combustion engine if the system for detecting pre-ignitions does contain an error, a standard path (26), which comprises sensor signal capturing, sensor signal evaluation, detection of pre-ignitions and initiation of measures to counter the pre-ignitions, is interrupted when the diagnosis detects an error in the system (17, 24, 29), and a safety path (27) is activated as an emergency operational mode.