Port Injection Engine Fuel Control via Exhaust Gas Recirculation
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Solution Overview
Problem
Internal combustion engines with direct-injection and port-injection systems face challenges such as high-temperature and high-pressure exposure issues, increased emission of particulate substances, and power loss due to high-pressure fuel injection, leading to higher costs and reduced performance.
Innovation Solution
An internal combustion engine design that includes an injector for fuel injection into the intake passage, with controlled injection during intake and exhaust strokes, utilizing an exhaust gas recirculation system to intensify turbulence and improve combustion stability without the need for a direct-injection injector within the cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a direct-injection injector is provided within the cylinder to inject fuel directly into the cylinder, then combustion efficiency is improved and fuel consumption is reduced, but the injector tip is exposed to high-temperature and high-pressure combustion gas causing deposits to accumulate and increasing system cost
Solution Approach 1:
The patent removes the direct-injection injector from the combustion chamber environment and relocates the fuel injection function to the intake passage. This extraction eliminates the injector's exposure to high-temperature combustion gas, preventing deposit accumulation and extending system reliability while maintaining the fuel injection function through port injection.
Solution Approach 2:
The patent introduces the intake passage as an intermediary medium to deliver fuel to the combustion chamber. Instead of directly injecting fuel into the high-temperature combustion environment, fuel is injected into the cooler intake passage and then carried into the cylinder, protecting the injector from thermal damage and deposit formation.
2Productivity
If fuel is injected at high pressure from the direct-injection injector, then combustion efficiency is improved, but power loss from the high-pressure pump affects performance
Solution Approach 1:
The patent changes the pressure parameter by eliminating the need for high-pressure fuel injection. By injecting fuel into the intake passage rather than directly into the combustion chamber, the system can use lower injection pressures, significantly reducing the power loss associated with high-pressure pump operation while maintaining adequate combustion efficiency.
3Stability of the object's composition
If fuel is injected from the direct-injection injector into the combustion chamber, then combustion stability is improved through intensified turbulence, but emission of particulate substances increases due to liquid film burning on chamber walls
Solution Approach 1:
The patent converts the potentially harmful effect of fuel contacting surfaces by redirecting the injection location. Instead of fuel injecting directly onto combustion chamber walls where it forms liquid films and particulates, the fuel is injected into the intake passage where it mixes with air before entering the cylinder, eliminating liquid film formation on hot surfaces while still allowing fuel to contribute to turbulence through its injection momentum.
4Productivity
If a direct-injection injector is provided within the cylinder, then performance is improved through direct fuel injection, but the cost of the combustion injection system is increased due to requirements for temperature resistance and pressure resistance
Solution Approach 1:
The patent replaces the expensive, high-specification direct-injection injector with a simpler, lower-cost port injection system. The intake passage injector does not require the same temperature and pressure resistance specifications, allowing for a less expensive manufacturing process and lower overall system cost while maintaining adequate performance through the port injection method.
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
This design maintains performance similar to direct fuel injection while reducing emissions, power loss, and costs by controlling fuel injection conditions and utilizing exhaust gas recirculation to enhance turbulence and stability within the cylinder.
Implementation Method 1
a latent heat of vaporization of the fuel can be utilized for cooling the intake air, and the temperature of the air-fuel mixture can be lowered
Implementation Method 2
injecting fuel into the intake passage... thereby intensifying the turbulence within the cylinder
Implementation Method 3
Through the momentum of a mist directly injected into the cylinder, the turbulence within a cylinder can be intensified, flame propagation can be promoted
Data Source
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AI summary
An internal combustion engine includes an injector which injects fuel into an intake passage, an intake stroke injection means which causes the injector to inject fuel in an intake stroke, an exhaust stroke injection means which causes the injector to inject fuel in an exhaust stroke, an exhaust gas recirculation means which recirculates a part of exhaust gas to an intake system, a setting means which sets the conditions of a recirculation of the exhaust gas by the exhaust gas recirculation means, and an injection control means which controls an operation ratio of the intake stroke injection means and the exhaust stroke injection means according to the condition of the recirculation of the exhaust gas by the setting means.