Fuel Injection Valve Stuck-Open Detection During Engine Operation
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Solution Overview
Problem
Conventional anomaly determination devices for internal combustion engines can only determine if a fuel injection valve is stuck open at engine startup, lacking the ability to detect such anomalies during operation.
Innovation Solution
An anomaly determination device that includes processing circuitry to execute a fuel cut-off time ignition process and stuck-open determination process, determining fuel injection valve anomalies by measuring rotation fluctuations during fuel cut-off, allowing detection of stuck-open and stuck-closed states while the engine is running.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anomaly determination device uses only startup pressure change detection, then the device complexity is low, but the detection capability is limited to startup only
Solution Approach 1:
The system dynamically adapts the detection method based on engine operating conditions. During startup, it uses pressure change detection, while during operation, it switches to rotation fluctuation detection combined with fuel cut-off timing, allowing continuous anomaly detection across different operational phases without requiring a permanently complex system
Solution Approach 2:
The system changes detection parameters based on operational state: at startup it monitors pressure changes in the fuel supply path, while during engine operation it monitors rotation fluctuation amounts. This parameter switching enables continuous detection capability without maintaining permanently active complex detection mechanisms for all conditions
2Reliability
If the system performs continuous anomaly detection during engine operation, then the reliability improves, but the device complexity increases
Solution Approach 1:
The existing engine control system with rotation sensors and fuel injection control is made multi-functional by adding anomaly detection capabilities. The same sensors used for engine control also provide data for anomaly detection, eliminating the need for separate dedicated detection hardware and reducing overall system complexity
Solution Approach 2:
The system uses its own operational parameters (rotation speed, fuel injection timing) to perform self-diagnosis. By monitoring its own performance characteristics during normal operation, the system detects anomalies without requiring external diagnostic equipment or additional complex sensing systems
3Measurement precision
If the system uses fuel cut-off time ignition process for detection, then the detection precision improves, but the energy consumption increases
Solution Approach 1:
Instead of continuous ignition-based detection, the system performs detection only during periodic fuel cut-off events that naturally occur during engine deceleration or idle conditions. This periodic approach achieves detection precision when needed while minimizing energy consumption by not activating detection mechanisms during full-load operation
Solution Approach 2:
The system converts the naturally occurring fuel cut-off periods (which would otherwise be idle time with no detection opportunity) into beneficial detection windows. By utilizing these existing fuel cut-off events for anomaly detection, the system achieves precise measurement without requiring additional energy-intensive continuous detection operations
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
Enables continuous detection of fuel injection valve anomalies, such as sticking open or closed, by analyzing engine rotation fluctuations, improving operational efficiency and reliability.
Implementation Method 1
an ignition device 16 that generates spark discharge for igniting air-fuel mixture
Implementation Method 2
a fuel injection valve 15 that injects fuel into intake air in the combustion chamber 12
Data Source
AI summary
An ECU executes a fuel cut-off time ignition process that causes the ignition device to generate a spark discharge during a fuel cut-off for temporarily stopping fuel injection of the fuel injection valve. The ECU determines that the fuel injection valve is stuck open when a rotation fluctuation amount of an internal combustion engine during execution of the fuel cut-off time ignition process is greater than or equal to a predetermined stuck-open determination value.