Ignition Control System Waveform Communication Line Abnormality Detection
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Solution Overview
Problem
The existing ignition control systems for internal combustion engines fail to detect abnormalities in the waveform control communication line, leading to continued spark plug discharge and increased wear, as well as elevated energy consumption due to short circuits.
Innovation Solution
An ignition control system that includes a discharge control unit to continue spark plug discharge after initiation, an electronic control unit to determine abnormality in the waveform control communication line by monitoring electric potential and current flow, and a switching apparatus to interrupt power when an abnormality is detected, thereby controlling discharge current and preventing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge control circuit continues discharge after spark plug initiation, then the ignitability is improved, but the wear of spark plug accelerates and energy consumption increases when communication line abnormalities occur
Solution Approach 1:
The ECU monitors the waveform control communication line status and uses this feedback to control the discharge current. When a short circuit is detected (abnormal feedback), the ECU stops the discharge current command, preventing further spark plug wear and energy waste while maintaining proper ignitability during normal operation.
Solution Approach 2:
The discharge control circuit dynamically adjusts the discharge current based on real-time communication line status. The system transitions between continuous discharge mode (normal operation for improved ignitability) and interrupted discharge mode (abnormal detection to prevent wear), making the system adaptive to operational conditions.
2Reliability
If the discharge control circuit continues discharge after spark plug initiation, then the ignitability is improved, but the energy consumption rate rises when communication line abnormalities occur
Solution Approach 1:
The ECU uses feedback from the waveform control communication line monitoring to control energy consumption. When a short circuit is detected, the feedback signal triggers the ECU to stop the discharge current command, preventing continuous energy consumption while maintaining ignitability during normal operation.
Solution Approach 2:
The system dynamically switches between high energy consumption continuous discharge mode (for improved ignitability) and low energy consumption interrupted mode (when abnormalities are detected), optimizing energy usage based on real-time communication line status.
3Object-affected harmful factors
If the waveform control communication line shorts out with a member on electric potential side, then the control signal is disrupted, but the discharge current control continues incorrectly
Solution Approach 1:
The ECU performs preliminary monitoring of the waveform control communication line to detect short circuits before they cause incorrect discharge current control. By detecting the abnormal electric potential in advance, the system can prevent erroneous continuous discharge commands, maintaining control accuracy even when communication line shorts occur.
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
The system effectively detects abnormalities in the waveform control communication line, reduces spark plug wear, and conserves energy by interrupting discharge current when necessary, maintaining ignitability and optimizing engine performance.
Implementation Method 1
when the output of the ignition signal is stopped, the energization of the primary coil is stopped, and therefore, counter electromotive force is generated in a secondary coil, resulting in the discharge of a spark plug
Data Source
AI summary
An ECU outputs an ignition signal Si to an ignition apparatus through an ignition communication line, and outputs a discharge waveform control signal Sc with a logic H through a waveform control communication line. The ignition apparatus performs the closing operation of an ignition switching element, in a period during which the ignition signal Si is input. In an input period of the discharge waveform control signal Sc after stopping the input of the ignition signal Si, the ignition apparatus controls the electric current to flow through a primary coil, by the opening-closing operation of a control switching element. When the voltage of the waveform control communication line Lc is the logic H in an output stop period of the discharge waveform control signal Sc, the ECU determines that the waveform control communication line is abnormal, and executes a fail-safe process.