Direct Injection Fuel Control via Real-Time Pressure Feedback
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Solution Overview
Problem
Conventional fuel injection control systems for direct injection internal combustion engines face challenges in maintaining precision due to fluctuations in fuel pressure, leading to errors in fuel injection control and adverse effects on air-fuel ratio and exhaust emissions.
Innovation Solution
A control apparatus that calculates the quantity of fuel injected by each injector and the quantity discharged from the high-pressure fuel pump, using these values to determine a reference for controlling the injectors based on fuel pressure at injection timing, thereby maintaining accurate fuel injection control without additional actuators or sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fuel pressure is measured during a predetermined period and reflected in following control, then fuel injection control is performed, but control precision deteriorates and error is caused when injection pulse width, injection timing, or pump discharge timing changes
Solution Approach 1:
The system continuously monitors fuel pressure and uses this feedback to dynamically adjust injection control parameters. The control apparatus calculates the actual fuel pressure at the moment of injection and uses this real-time information to correct the injection pulse width, ensuring precise fuel quantity control despite pressure fluctuations caused by pump discharge timing variations.
Solution Approach 2:
The invention transitions from static predetermined measurement periods to dynamic real-time pressure monitoring. The system adapts the measurement timing to coincide with actual injection events, making the control system responsive to changing conditions such as varying injection pulse widths and pump discharge timings, thereby maintaining high precision under dynamic operating conditions.
2Productivity
If fuel pressure fluctuates due to fuel discharge from pump and injection from injectors, then fuel injection control is performed, but air-fuel ratio control precision deteriorates and exhaust emission is adversely affected
Solution Approach 1:
The control apparatus performs preliminary calculation of the expected fuel pressure at the moment of injection by considering the pump discharge timing and injection pulse width. This predicted pressure value is then used to pre-correct the injection control parameters, ensuring that when the actual injection occurs, the fuel quantity is precisely controlled despite upcoming pressure fluctuations from pump discharge.
Solution Approach 2:
The system dynamically changes the injection control parameters (pulse width, timing) based on real-time fuel pressure measurements and predicted pressure changes. By adjusting these parameters in response to actual pressure conditions, the system compensates for fluctuations and maintains stable air-fuel ratio control, thereby reducing harmful exhaust emissions.
Data Source
AI summary
An apparatus controls the quantity of fuel injection of an injector in accordance with the fuel pressure in the fuel rail of a direct injection type internal combustion engine. A reference value for controlling the injector is obtained on the basis of the difference and the fuel pressure in the fuel rail at the time of starting fuel injection out of injector.