Capacitor Discharge Ignition Diagnosis via Singularity Counting
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Solution Overview
Problem
Existing diagnosis methods for capacitor discharge ignition devices in engines fail to accurately detect abnormalities in the ignition power supply portion and ignition coil, leading to improper determination of device normalcy even when abnormalities exist.
Innovation Solution
A diagnosis device that detects singularities in the voltage waveform between the output terminals of the ignition power supply portion and counts these singularities while the crankshaft rotates through a specific measurement section, comparing the count to the number of normal ignitions to determine device normalcy, and identifies abnormalities in the ignition coil and power supply by determining if the capacitor charging voltage is provided.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the charging voltage of the ignition capacitor is monitored to diagnose abnormalities, then the diagnosis method is simple, but it cannot accurately distinguish between power supply abnormalities and ignition coil abnormalities
Solution Approach 1:
The diagnosis method is segmented into two distinct approaches: monitoring the charging voltage at the ignition capacitor to detect power supply abnormalities, and measuring the output voltage of the ignition coil to detect ignition coil abnormalities. This segmentation allows each measurement to target specific components, resolving the inability to distinguish between different types of abnormalities while maintaining operational simplicity.
Solution Approach 2:
The patent introduces an intermediary measurement point between the ignition power supply portion and the ignition coil. By measuring both the charging voltage (intermediary state) and the output voltage (final state), the system can identify where the abnormality occurs in the signal transmission chain, enabling accurate distinction between power supply and ignition coil issues.
2Device complexity
If only the charging voltage is monitored, then the diagnosis device is simple, but it cannot identify unexpected abnormalities or detailed abnormal states
Solution Approach 1:
The diagnosis device is designed with multi-functionality: it can detect power supply abnormalities through charging voltage monitoring, detect ignition coil abnormalities through output voltage measurement, and identify unexpected abnormalities by comparing both measurements against expected values. This universal approach enables comprehensive abnormality detection without requiring separate specialized devices for each function.
Solution Approach 2:
The system implements feedback by continuously monitoring both charging voltage and output voltage, comparing these measurements against expected values, and using this feedback information to identify the specific type and location of abnormalities. This feedback mechanism ensures complete abnormality information is captured and processed for accurate diagnosis.
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
Accurately diagnoses abnormalities in the ignition power supply portion and ignition coil, enabling detailed identification of abnormal states and unexpected issues, ensuring proper maintenance and repair of the ignition device.
Implementation Method 1
an exciter coil provided in an AC generator driven by an engine
Implementation Method 2
a rectifier circuit that rectifies an AC output of the exciter coil
Implementation Method 3
interrupts the short-circuit current to induce an increased voltage of a pulse waveform in the exciter coil
Implementation Method 4
an ignition capacitor connected between the output terminals of the ignition power supply portion through the primary coil
Implementation Method 5
inducing a high voltage for ignition in a secondary coil of the ignition coil by the discharge of the charges accumulated in the ignition capacitor
Data Source
AI summary
A diagnosis device of a capacitor discharge ignition device for an engine that detects, as a singularity, a leading edge or a trailing edge of a voltage between output terminals of an ignition power supply portion that generates a voltage for charging an ignition capacitor, counts the number of singularities detected while a crankshaft rotates through a measurement section, which is a section of a certain crank angle determined with reference to a pulse signal obtained by a signal generator that generates a pulse signal at a specific crank angle position of an engine, and diagnoses an abnormality of the ignition device and a cause of the abnormality by comparing the count value of singularity with the number of times of normal ignition of the engine performed while the crankshaft rotates through the measurement section.