Fuel Supply Controller Clogging Detection Logic
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Solution Overview
Problem
Conventional fuel supplying controllers face reliability issues in clogging detection due to temperature-dependent fuel viscosity changes, leading to erroneous determinations of fuel filter clogging, as existing methods rely solely on vehicle-state values and do not accurately account for ambient temperature and residual fuel quantity effects.
Innovation Solution
A fuel supplying controller that includes an ambient-temperature detection portion and a residual-fuel detection portion to set a non-detection period for clogging detection, ensuring accurate measurement of fuel temperature changes and preventing erroneous clogging determinations by considering ambient temperature and residual fuel quantity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clogging detection is performed continuously, then detection reliability is improved, but false detections occur due to fuel viscosity changes at low temperatures
Solution Approach 1:
The system performs preliminary actions by setting a non-detection period before actual clogging detection. During this period, the timer counter accumulates time based on vehicle-state values and ambient temperature. Only after the counter exceeds the predetermined threshold is clogging detection enabled, ensuring fuel viscosity has stabilized and preventing false detections during high-viscosity periods.
Solution Approach 2:
The non-detection period is made dynamic rather than fixed. The timer counter's accumulation rate varies based on vehicle-state values (engine speed, vehicle speed) and ambient temperature. This dynamic adjustment allows the system to adapt the waiting period to actual operating conditions, optimizing both reliability and detection accuracy.
2Device complexity
If non-detection period is set based only on vehicle-state values, then device complexity is reduced, but detection reliability deteriorates due to inaccurate fuel temperature change measurement
Solution Approach 1:
The timer counter serves multiple functions: it tracks the non-detection period duration, accumulates time based on varying vehicle-state values, and indirectly reflects fuel temperature changes. By making the counter's accumulation rate dependent on engine speed, vehicle speed, and ambient temperature, the system uses a single component to handle multiple detection requirements without adding complex temperature sensors or separate measurement systems.
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 improves the reliability of clogging detection by accurately measuring fuel temperature changes and determining when high-viscosity changes are canceled, reducing false positives and negatives in clogging assessments.
Implementation Method 1
It is known that a viscosity of fossil fuel used in the internal combustion engine varies according to the fuel temperature. When the fuel temperature becomes lower, the viscosity of the fuel becomes higher.
Implementation Method 2
a supply pump drawing the fuel from the fuel tank and supplying the fuel to an internal combustion engine
Implementation Method 3
a fuel filter provided in a passage between the fuel tank and the supply pump to remove foreign matters in the fuel
Implementation Method 4
the clogging detection portion detects the clogging of the fuel tank by measuring a fuel pressure of the fuel drawn by the supply pump
Data Source
AI summary
A fuel supplying controller detecting a clogging of a fuel filter includes a period setting portion setting a non-detection period where a clogging detection is prohibited, an ambient-temperature detection portion detecting an ambient temperature of an exterior of a vehicle, and a residual-fuel detection portion detecting a residual-fuel quantity in a fuel tank. The period setting portion sets the non-detection period, based on the ambient temperature detected by the ambient-temperature detection portion and the residual-fuel quantity detected by the residual-fuel detection portion.