Fuel Injection Control Stabilizing Pressure for Precision
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Solution Overview
Problem
Existing fuel injection control systems for internal combustion engines face challenges in accurately controlling the amount of fuel injected by the cylinder injection valve, especially when the amount is small, due to the difficulty in managing high fuel pressures.
Innovation Solution
A fuel injection control apparatus that includes a high pressure supply pump and fuel pressure adjustment means to stabilize the fuel pressure of the cylinder injection valve, allowing for precise control of fuel injection amounts by adjusting the working state of the high pressure supply pump based on the engine's operating state and maintaining its state for a predetermined period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fuel pressure is increased to enable direct injection into the combustion chamber, then the capability to inject fuel directly into the combustion chamber is improved, but the precision of controlling small fuel injection amounts deteriorates
Solution Approach 1:
The patent applies dynamics by making the fuel pressure adjustable rather than fixed. The control unit varies the fuel pressure according to the injection amount requirements: using lower pressure for small injection amounts to maintain precision, and higher pressure for large injection amounts to ensure sufficient fuel delivery capability. This dynamic adjustment resolves the contradiction between injection capability and control precision.
Solution Approach 2:
The patent changes the fuel pressure parameter based on operating conditions and injection requirements. By adjusting the fuel pressure parameter dynamically, the system can optimize both the capability to inject fuel directly into the combustion chamber and the precision of controlling small injection amounts, depending on the specific operational context.
2Productivity
If fuel pressure is increased for high load operation, then the fuel delivery capability is improved, but the control accuracy of injection amount deteriorates
Solution Approach 1:
The system dynamically adjusts fuel pressure based on engine load and injection requirements. For high load operations requiring large fuel amounts, higher pressure is applied to maintain delivery capability. For operations requiring precise small fuel amounts, lower pressure is used to maintain control accuracy, thus resolving the contradiction between productivity and precision.
Solution Approach 2:
The fuel pressure parameter is changed according to operating conditions. The control unit selects appropriate pressure levels based on the required injection amount, ensuring both sufficient fuel delivery capability for high load operations and adequate control accuracy for precise injection requirements.
3Adaptability or versatility
If the high pressure supply pump operates at high pressure, then the fuel injection capability into combustion chamber is improved, but the stability of fuel injection amount deteriorates
Solution Approach 1:
The patent implements dynamic pressure control where the high pressure supply pump adjusts its output pressure based on real-time injection requirements. By using lower pressures for small injection amounts and higher pressures for large injection amounts, the system maintains both injection capability and injection stability, resolving the contradiction between adaptability and stability.
Solution Approach 2:
The fuel pressure parameter is dynamically changed according to injection needs. The control unit monitors injection requirements and adjusts the supply pump pressure accordingly, ensuring that the fuel injection amount remains stable and predictable across different operating conditions while maintaining the capability to inject directly into the combustion chamber.
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
Enables accurate control of fuel injection amounts from the cylinder injection valve, even when small amounts are required, by stabilizing the fuel pressure and maintaining the high pressure supply pump's working state, thus improving the precision of fuel delivery.
Implementation Method 1
a high pressure supply pump capable of supplying fuel at a higher pressure than the pressure of fuel to be supplied to the intake passage injection valve
Implementation Method 2
fuel pressure adjustment means which controls the working state of the high pressure supply pump in accordance with the injection form to adjust the fuel pressure of the second fuel injection valve
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A fuel injection control apparatus of an internal combustion engine, capable of controlling the amount of fuel, which is injected from a cylinder injection valve (second fuel injection valve), with high accuracy even when its amount is small, regardless of the operating state of the internal combustion engine, is provided. The fuel injection control device has a fuel pressure adjustment means which, when the injection form of the internal combustion engine is changed, adjusts the working state of a high pressure supply pump such that the amount of fuel injection from the second fuel injection valve stabilizes, before changing the working state of the high pressure supply pump in accordance with the injection form.