Engine Controller Port Injection Ratio Regulation
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Solution Overview
Problem
The displacement of the air-fuel ratio from its proper value during the injection reducing process in internal combustion engines hinders the recovery of the exhaust purifying member's function, primarily due to fuel adherence at the intake ports, which increases with port injection, leading to improper fuel distribution and engine performance issues.
Innovation Solution
A controller for internal combustion engines that adjusts the port injection ratio based on engine operating states, limits increases in adhered fuel at the intake ports by regulating the port injection ratio, and optionally stops port injection or splits direct injection to maintain accurate fuel distribution, thereby minimizing air-fuel ratio displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If port injection is performed to supply fuel to cylinders, then fuel supply to cylinders is improved, but fuel adheres to intake ports causing air-fuel ratio displacement
Solution Approach 1:
The patent dynamically adjusts the port injection ratio based on engine operating conditions and accumulated adhered fuel amount. The control device changes the port injection ratio over time during injection reducing process to prevent excessive fuel adhesion while maintaining proper fuel supply to cylinders, resolving the contradiction between fuel supply quantity and air-fuel ratio accuracy.
Solution Approach 2:
The patent changes the port injection ratio parameter during the injection reducing process. By regulating this parameter, the system limits increases in adhered fuel amount while maintaining adequate fuel supply to cylinders, thus preventing air-fuel ratio displacement from proper values.
2Reliability
If injection reducing process is executed to restore exhaust purifying member function, then exhaust purification is improved, but air-fuel ratio displacement increases due to fuel adhesion
Solution Approach 1:
The patent implements a feedback control mechanism where the control device monitors the accumulated adhered fuel amount and adjusts the port injection ratio accordingly. This feedback loop ensures that during the injection reducing process, the port injection ratio is regulated to limit fuel adhesion increases, preventing air-fuel ratio displacement while maintaining exhaust purification function.
Solution Approach 2:
The port injection ratio is dynamically adjusted during the injection reducing process based on real-time monitoring of adhered fuel accumulation. This dynamic regulation allows the system to maintain exhaust purification effectiveness while preventing excessive fuel adhesion that would cause air-fuel ratio displacement.
3Quantity of substance
If port injection ratio is increased to improve fuel distribution, then fuel supply to cylinders is enhanced, but fuel adherence at intake ports increases
Solution Approach 1:
The patent dynamically regulates the port injection ratio during the injection reducing process to prevent excessive fuel adhesion. By adjusting this ratio over time based on accumulated adhered fuel amount, the system maintains adequate fuel supply to cylinders while limiting fuel adherence at intake ports.
Solution Approach 2:
The control device changes the port injection ratio parameter during operation to optimize fuel distribution while minimizing fuel adhesion. This parameter adjustment ensures that fuel supply to cylinders remains sufficient while preventing harmful fuel accumulation at intake ports.
Data Source
AI summary
A controller and a control method for internal combustion engine, and a memory medium are provided. A port injection ratio is changed according to an engine operating state of the internal combustion engine. The port injection ratio is a ratio of a port injection amount that is an amount of fuel injected by port injection valves to an amount of fuel supplied to cylinders from the port injection valves and direct injection valves. An injection reducing process causes a fuel injection amount in a reduced-injection cylinder to be smaller than a fuel injection amount in other cylinders. An increase limiting process limits increases in an adhered fuel amount in intake ports by regulating the port injection ratio during execution of the injection reducing process.