Injector Driving Apparatus Current Guard Diagnosis
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Solution Overview
Problem
Conventional injector driving apparatuses face challenges in diagnosing the current supply period guard function without causing unnecessary fuel injection, as they lack a method to test the function without activating the injectors.
Innovation Solution
An injector driving apparatus is designed with a diagnosis part that supplies current to the coils for a period shorter than the minimum required for fuel injection, allowing continuous current flow through a common path, and includes a current supply period guard mechanism to stop the current when a predetermined period is reached, ensuring the function is tested without actual fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current is supplied to the coil for diagnosis of the current supply period guard function, then the function can be tested, but the injector is driven to inject fuel unnecessarily
Solution Approach 1:
The diagnosis part changes the current supply period parameter to be shorter than the minimum period required for fuel injection. By supplying current for a duration that triggers the current supply period guard function but is insufficient to open the injector valve, the system can test the guard function without causing actual fuel injection.
2Reliability
If the current supply period is limited to a predetermined period, then engine power output is limited for safety, but the ability to diagnose the guard function is compromised
Solution Approach 1:
The diagnosis part performs partial action by supplying current for a period that is excessive enough to trigger the guard function but controlled to remain below the threshold for fuel injection. This allows the system to test the guard function's operation without fully activating the injector, enabling diagnosis while maintaining safety.
Solution Approach 2:
The diagnosis part uses feedback from the current supply period guard function to determine whether it is operating normally. By monitoring whether the current supply is properly stopped when the predetermined period is reached, the system can diagnose the guard function's status without causing harmful fuel injection.
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
This solution enables effective diagnosis of the current supply period guard function without causing the injectors to inject fuel unnecessarily, improving the reliability of the engine control system by ensuring the current supply is properly limited, thus enhancing safety and performance.
Implementation Method 1
an injector for injecting fuel into an engine of a vehicle is electro-magnetically operated to open in response to supply of a current to a coil
Data Source
AI summary
In an injector driving apparatus, a driving circuit supplies a current individually to each coil of multiple injectors, a current detection element detects the current flowing in a common current flow path, which is common to the coils, a current supply period guard part forcibly stops the current supplied from the driving circuit to the coil upon determination that a measured period reached a predetermined set period based on a detection result of the current detection element, and a diagnosis part operates in a period of no fuel injection to check whether the current supply period guard part normally stops the current supplied to the coil, by continuously supplying the current to the coil for only a short period, which disables the injector to open a valve, and sequentially switches over the coils.