Injector Valve Timing Control for High-Pressure Fuel Injection Faults
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Solution Overview
Problem
In fuel injection systems, faults in the high-pressure fuel pump can lead to excessively high delivery power, causing pressure increases that exceed the nominal pressures of injector valves, potentially resulting in engine failure due to the inability of injector valves to open under maximum pressure conditions.
Innovation Solution
A control method that detects fault situations by monitoring the high-pressure region and adjusts the opening time of the injector valve to align with pressure valleys within the pressure oscillation caused by a pressure-limiting valve, allowing the valve to open reliably even during high-pressure conditions, and sets the opening pressure of the pressure-limiting valve below the maximum admissible pressure to ensure injector valve operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure-limiting valve is provided to limit pressure in the high-pressure region, then pressure can be restricted to prevent engine failure, but pressure peaks still occur that exceed the nominal pressures of injector valves, preventing them from opening
Solution Approach 1:
The injection timing is dynamically adjusted based on the pump piston position. The control device determines TDC times and calculates a period duration, then sets the injection timing to occur in the second or third quadrant of the periodic process. This dynamic timing adjustment allows the injector valve to open during pressure valleys rather than during pressure peaks, resolving the contradiction between maintaining pressure limits and enabling valve operation.
Solution Approach 2:
The invention changes the temporal parameter of injection timing rather than modifying the pressure-limiting valve's pressure setting. By shifting the injection event to occur at a different phase in the pressure oscillation cycle (from arbitrary timing to specifically timed injection during pressure valleys), the system enables valve operation without altering the pressure-limiting valve's nominal pressure setting.
2Quantity of substance
If the high-pressure fuel pump delivers a large volume flow to meet engine demand, then fuel supply is sufficient, but undesired pressure increase occurs in the fuel injection system during fault situations
Solution Approach 1:
The control device continuously monitors the operational state of the fuel injection system and detects fault situations. Based on this feedback, it adjusts the injection timing to occur during pressure valleys. This feedback mechanism allows the system to maintain normal fuel delivery quantities while adapting the timing to prevent pressure buildup during fault conditions.
3Power
If the injector valve is designed to open against maximum pressure in the high-pressure region, then injection can occur under high-pressure conditions, but the valve cannot open when pressure exceeds nominal levels due to faults
Solution Approach 1:
The control device preliminarily determines the pump piston position and TDC times before executing injection. By calculating the period duration and identifying the second or third quadrant timing in advance, the system prepares the optimal injection moment that occurs during a pressure valley, ensuring the valve can reliably open against the actual pressure conditions rather than against maximum possible pressure.
Data Source
AI summary
The disclosure relates to a control method for controlling at least one injector valve in a fuel injection system of an internal combustion engine. An opening time of the injector valve is selected such that, in a fault situation in the fuel injection system, an opening time of the injector valve is situated in a pressure valley of a pressure oscillation prevailing in a high-pressure region of the fuel injection system.