Retarding Ignition Timing to Prevent CNG Engine Backfire
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Solution Overview
Problem
Existing CNG engines are prone to backfire phenomena due to leaked current, abnormal valve intervals, and ignition timing issues, leading to damage to intake hoses and throttle body valves, and there is a need for a method to prevent these occurrences effectively.
Innovation Solution
A device comprising a monitoring system that tracks engine operating information such as RPM, intake pressure, intake temperature, throttle valve opening level, and control current value, determines backfire occurrences by comparing these parameters to set values, and retards the ignition timing of affected cylinders to prevent damage and alert the driver through a warning lamp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If ignition timing is advanced to improve combustion efficiency, then fuel efficiency is improved, but back fire occurs more frequently causing damage to intake components
Solution Approach 1:
The system performs preliminary detection of backfire conditions by monitoring operating parameters (intake pressure, temperature, throttle position) before actual backfire occurs. When backfire is predicted based on parameter thresholds, the ignition timing is proactively retarded to prevent the harmful event, thus resolving the contradiction between advanced ignition for efficiency and backfire prevention for reliability.
Solution Approach 2:
The system continuously monitors engine operating parameters and provides feedback to the control unit. When parameters indicate potential backfire conditions (abnormal intake pressure, temperature, or throttle position), the system adjusts ignition timing in real-time. This closed-loop feedback mechanism allows the system to maintain fuel efficiency under normal conditions while automatically preventing backfire when needed.
2Measurement precision
If monitoring parameters are increased to improve backfire detection accuracy, then detection precision is improved, but device complexity increases
Solution Approach 1:
The monitoring system uses existing multi-functional sensors that serve both normal engine control functions and backfire detection functions. The intake pressure sensor, temperature sensor, and throttle position sensor are already present for standard engine operation, and the same sensors are utilized for backfire prediction, eliminating the need for additional dedicated detection devices and thus avoiding increased system complexity.
Solution Approach 2:
The control unit leverages its existing processing capabilities to perform backfire detection and prediction algorithms without requiring additional dedicated hardware. The system uses its own computational resources to analyze sensor data and make ignition timing adjustments, making the detection system self-sufficient and avoiding complexity increases from separate monitoring devices.
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 solution effectively predicts and prevents backfires by adjusting ignition timing, reducing engine damage and improving fuel efficiency and drivability while enhancing the operational environment of CNG engines.
Implementation Method 1
uncombusted fuel flows backward toward an intake pipe to be combusted in the intake pipe
Data Source
AI summary
A method for preventing back fire of an engine by a device for preventing back fire of an engine, may include monitoring operating information of the engine; determining whether the back fire occurs by using the operating information of the engine; and controlling an ignition timing to be retarded when the back fire occurs as the determination result.