Engine Controller Fuel Introduction for Catalyst Temperature Control
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Solution Overview
Problem
Internal combustion engines with dual injection modes lack a detailed fuel introduction process to effectively increase the temperature of the three-way catalyst device for particulate removal without clogging the filter, especially when the intake air amount is small and engine rotational speed is high.
Innovation Solution
A controller that executes a fuel introduction process using only the port injection valve of the in-cylinder injection valve and the port injection valve, introducing an unburned air-fuel mixture into the exhaust passage without burning it in the cylinder, thereby increasing the temperature of the three-way catalyst device to burn and remove particulates from the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel injection amount is increased to increase catalyst temperature, then particulate removal efficiency is improved, but catalyst temperature may increase excessively causing filter clogging
Solution Approach 1:
The controller changes the fuel injection parameters by selecting different injection modes (port injection vs. in-cylinder injection) and adjusting injection timing based on detected operating conditions (intake air amount, engine rotational speed). This allows precise control of catalyst temperature to remove particulates without excessive heating that would cause filter clogging.
Solution Approach 2:
The controller detects intake air amount and engine rotational speed, then feedback-adjusts the fuel injection amount and timing. This closed-loop control ensures the catalyst temperature remains within the optimal range for particulate removal while preventing excessive temperature increases that would damage the filter.
2Stress or pressure
If in-cylinder injection valve is used for fuel introduction process, then fuel injection pressure is high, but minimum injection amount is larger than port injection valve making it difficult to control catalyst temperature
Solution Approach 1:
The fuel injection system is segmented into two independent valves: port injection valve and in-cylinder injection valve. The controller selectively activates only the port injection valve during the fuel introduction process, allowing precise control of fuel amount introduced into the exhaust passage. This segmentation enables fine-grained control of catalyst temperature without the high minimum injection amounts required by the in-cylinder injection valve.
3Productivity
If fuel introduction process is executed with small intake air amount and high engine rotational speed, then catalyst temperature can be increased, but fuel injection amount becomes insufficient to maintain appropriate temperature range
Solution Approach 1:
The controller dynamically adjusts the fuel injection strategy based on real-time detection of intake air amount and engine rotational speed. When operating conditions change (e.g., high rotational speed, variable air amount), the controller modifies injection timing, injection mode, and fuel amount to maintain optimal catalyst temperature for particulate removal while adapting to the current operational state.
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 approach prevents filter clogging by ensuring the catalyst temperature increases within a controlled range, maintaining efficient particulate removal and reducing the risk of excessive fuel injection, which can lead to clogging, especially when the intake air amount is small and engine rotational speed is high.
Implementation Method 1
The unburned air-fuel mixture introduced into the exhaust passage flows into the three-way catalyst device and burns in the three-way catalyst device. When the heat generated by the combustion increases the temperature of the three-way catalyst device, the temperature of the gas flowing out of the three-way catalyst and into the filter increases.
Implementation Method 2
When the heat of the high-temperature gas increases the temperature of the filter to the ignition point of the particulates, the particulates deposited in the filter are burned and removed.
Data Source
AI summary
A controller for an internal combustion engine is configured to control the internal combustion engine. The internal combustion engine includes an in-cylinder injection valve, an ignition device, an exhaust passage, and a three-way catalyst. The controller includes a fuel introduction processor configured to execute a fuel introduction process of introducing air-fuel mixture of fuel and air, which has been introduced into a cylinder, into the exhaust passage without burning the air-fuel mixture in the cylinder. The fuel introduction processor is configured to execute the fuel introduction process in a state in which only a port injection valve of the in-cylinder injection valve and the port injection valve performs fuel injection.