Fuel Injection Control Device Adaptive Abnormality Detection
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Solution Overview
Problem
Existing fuel injection control systems may erroneously determine split injection as abnormal, leading to unintended fail-safe control measures, such as stopping fuel injection, due to not considering the internal combustion engine's state.
Innovation Solution
A fuel injection control device that includes a fuel injection pulse output unit, a drive state detection unit, an injection abnormality detection unit, and an injection abnormality detection execution determining unit, which prevents erroneous abnormality detection by assessing the internal combustion engine's state and only permitting injection abnormality detection when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous abnormality detection is performed regardless of engine state, then detection coverage is improved, but false abnormality determination occurs due to engine state variations
Solution Approach 1:
The patent applies dynamics by making the abnormality detection function adaptive to engine operating conditions. The control unit dynamically determines whether to execute abnormality detection based on detected engine state (e.g., temperature, load, speed). This resolves the contradiction by enabling detection when engine state is stable and reliable, while suppressing detection when engine state variations could cause false positives, thus maintaining both detection coverage and accuracy.
2Measurement precision
If abnormality detection is suppressed based on engine state, then false determination is reduced, but detection coverage decreases when detection is needed
Solution Approach 1:
The patent implements feedback control where the control unit continuously monitors engine state and uses this information to decide whether to permit abnormality detection. The feedback loop ensures that detection is activated when engine conditions are favorable (reducing false positives) while maintaining detection capability when needed, thus balancing false determination reduction with adequate detection coverage.
3Object-generated harmful factors
If split injection is performed to shorten spray length, then particulate matter formation is reduced, but abnormality detection becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing a single fuel injection event into multiple separate injections (split injection). This shortens the spray length of each individual injection, preventing fuel from reaching the piston crown and reducing particulate matter formation. The control unit manages multiple injection events within one combustion cycle, making the injection control more complex but achieving the environmental benefit.
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
Prevents erroneous determination of fuel injection abnormalities, ensuring accurate normal operation of the fuel injection system and avoiding unnecessary control measures that could affect engine performance.
Implementation Method 1
a fuel injection control device that controls a plurality of fuel injection valves each having a coil for energization
Data Source
AI summary
In abnormality determination of determining whether fuel injection has been executed normally, making an erroneous determination is prevented. A fuel injection control device 127 that controls a plurality of fuel injection valves each having a coil for energization includes a drive state detection unit 211 that detects a drive state of a fuel injection valve, from an energization current or an applied voltage of the coil of the fuel injection valve, an injection abnormality detection unit 213 that detects an injection abnormality of the fuel injection valve by comparing a fuel injection instruction with the drive state of the fuel injection valve, and an injection abnormality detection execution determining unit 212 that based on a state of an internal combustion engine, determines whether or not to permit execution of injection abnormality detection by the injection abnormality detection unit 213.