Igniter Switch Control Circuit Misfire Detection
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Solution Overview
Problem
Conventional ignition devices for gasoline vehicles lack effective misfire status detection, which can lead to engine misfires and performance issues.
Innovation Solution
A switch control circuit and igniter design that includes a transistor and protection element connected between the collector and gate of the transistor, with a status detection circuit using voltage changes at the gate terminal or collector current to generate a status detection signal, allowing for misfire status detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional ignition device without status detection is used, then the device complexity is reduced, but the ability to detect misfire status is lost
Solution Approach 1:
The status detection circuit utilizes existing voltages and currents within the ignition circuit (gate terminal voltage or collector current) for detection purposes. The circuit monitors its own operational parameters to determine spark plug status, eliminating the need for separate sensing components and enabling misfire detection without significantly increasing overall device complexity
Solution Approach 2:
The status detection circuit serves multiple functions: it monitors the ignition switch element status, detects misfire conditions, and provides diagnostic information. By using the same circuit nodes (gate terminal or collector) for both switching control and status detection, the patent achieves multi-functionality without adding separate detection pathways
2Reliability
If a status detection circuit is added to detect misfire, then the reliability of engine operation is improved, but the device complexity increases
Solution Approach 1:
The status detection circuit monitors existing operational parameters (gate voltage or collector current) that are already present in the ignition circuit during normal operation. By utilizing these self-generated signals for detection, the circuit achieves reliable misfire detection without requiring external sensing components or additional signal sources
Solution Approach 2:
The status detection circuit provides feedback about the ignition system's operational status by monitoring the voltage or current signals. This feedback mechanism enables the system to detect misfire conditions and communicate this information for diagnostic purposes, improving overall system reliability through continuous monitoring
Data Source
AI summary
A switch control circuit controls a switch element connected to a primary coil of an ignition coil in accordance with an ignition signal. The switch element includes a transistor and a protection element connected between a collector and gate of the transistor. The switch control circuit uses a voltage at a gate terminal controlling the transistor or a voltage corresponding to a collector current of the transistor as a detection voltage and generates a status detection signal corresponding to a change in the detection voltage.