Knock Sensor Misfire Detection After Exhaust Valve Opening
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Solution Overview
Problem
Existing methods for detecting misfiring in internal combustion engines are unreliable, costly, and require complex sensor systems, leading to inefficiencies and potential damage due to delayed detection and increased hydrocarbon emissions.
Innovation Solution
Utilizing an acceleration sensor, particularly a knock sensor, to detect sound measurement signals during the evaluation-relevant operating cycle angle range after the exhaust valve opens, allowing for reliable and cost-effective misfiring detection without additional sensors or complex integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods for detecting misfiring are used, then detection capability is provided, but reliability is poor and device complexity increases
Solution Approach 1:
The knock sensor is made multi-functional by enabling it to detect both knock signals and misfiring conditions. The evaluation module analyzes knock signals from the existing sensor to identify misfiring patterns, eliminating the need for separate misfiring sensors and reducing system complexity while improving detection reliability
Solution Approach 2:
The misfiring detection function is merged with the existing knock detection system. The same acceleration sensor and evaluation module that detect knock are also used to detect misfiring by analyzing the same knock signals for specific misfiring patterns, thereby simplifying the overall sensor system
2Measurement precision
If additional sensors are added for misfiring detection, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The existing knock sensor is made multi-functional to serve both knock detection and misfiring detection purposes. The evaluation module processes the knock sensor signals to identify misfiring patterns, achieving precise misfiring detection without adding any physical sensors to the system
3Reliability
If complex sensor systems are used, then detection capability is enhanced, but ease of manufacture decreases
Solution Approach 1:
The evaluation module is designed to perform multiple functions using the same hardware resources. It processes knock sensor signals to detect both knock events and misfiring conditions, eliminating the need for separate detection systems and simplifying manufacturing and integration processes
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 simple, reliable, and cost-effective misfiring detection by leveraging existing knock sensors, reducing sensor costs and complexity, and preventing engine damage while maintaining efficient operation.
Implementation Method 1
an acceleration sensor, in particular a knock sensor, for detecting a sound measurement signal at the cylinder
Data Source
AI summary
A sensor and evaluation device configured for detecting a misfire in an internal combustion engine, the sensor and evaluation device including: a control sensor system, which includes an acceleration sensor configured for acquiring a sound measurement signal at a cylinder and for providing a knock signal assigned to the sound measurement signal; and a module configured for at least one of acquiring and evaluating the knock signal, wherein the sensor and evaluation device is configured such that: an evaluation-relevant operating cycle angle range is assigned to an operating cycle range after an exhaust valve is opened; the sound measurement signal at the cylinder is detected by the acceleration sensor at least for the evaluation-relevant operating cycle angle range, and the knock signal assigned to the sound measurement signal for the evaluation-relevant operating cycle angle range is fed to the module in an evaluable manner.