Fuel Injector Short-Circuit Detection via Current Rise Duration
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Solution Overview
Problem
In fuel injection systems, short-circuiting of fuel injectors can lead to unintended actuation of associated injectors, causing damage to engine components due to mistimed and excessive fuel injection, which existing methods fail to detect promptly enough to prevent damage.
Innovation Solution
A control system that initiates current flow in fuel injectors, measures the rise duration to reach a threshold level, compares it with a preset duration, and controls the fuel injection system based on this comparison to diagnose faults and prevent further injection in case of a short-circuit, thereby preventing engine damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fuel injectors share connections in the fuel injection system, then the system can operate with fewer components and simpler wiring, but short-circuiting of one injector can cause unintended actuation of associated injectors leading to engine damage
Solution Approach 1:
The control system performs a preliminary diagnostic action by measuring the rise duration of current flow before actual fuel injection occurs. This early detection of short-circuit conditions prevents unintended injector actuation and potential engine damage while maintaining the simplified shared connection architecture.
2Reliability
If existing fault detection methods are used, then the system can identify short-circuit conditions, but the detection is not prompt enough to prevent engine damage from mistimed fuel injection
Solution Approach 1:
The system performs fault detection before fuel injection occurs by measuring current rise duration in advance. This preliminary diagnostic action provides timely detection of short-circuit conditions, enabling the control system to prevent mistimed fuel injection and potential engine damage.
Solution Approach 2:
The patent replaces traditional voltage-based short detection methods with a current-based rise duration measurement approach. This substitution provides faster and more reliable fault detection by directly monitoring the current characteristics that indicate short-circuit conditions before fuel injection occurs.
3Measurement precision
If the control system measures rise duration of current flow to detect short-circuits, then fault detection accuracy is improved, but the system complexity increases due to additional measurement and comparison modules
Solution Approach 1:
The control system utilizes existing current sensing capabilities for dual purposes: normal fuel injection control and short-circuit detection. By measuring the rise duration of current flow during the injection event, the system achieves precise fault detection without requiring separate dedicated measurement hardware, thus minimizing added complexity.
Data Source
AI summary
A method for fault diagnosis in a fuel injection system having first and second fuel injectors. The method includes initiating a current flow in the first and second fuel injectors. Further, a rise duration of the current flow to reach a threshold level is measured. The method further includes comparing the rise duration and a preset duration. The fuel injection system is controlled based on the comparison.