Fuel Injection Controller Combustion Diagnosis Catalyst Warm-up
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Solution Overview
Problem
During catalyst rapid warm-up control in internal combustion engines, single injection mode slows down the catalyst warm-up process, and existing technologies lack effective self-diagnosis methods to determine combustion state satisfaction, especially when inferior fuel is used, leading to potential engine speed decreases.
Innovation Solution
A fuel injection controller that selects between single and split injection modes based on engine operation state and drive current detection signals to determine the combustion state's satisfaction, using a number-of-injections count value to assess the combustion state and adjust injection modes accordingly during catalyst rapid warm-up control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If single injection mode is used during catalyst rapid warm-up control, then engine torque increases and engine speed is maintained, but catalyst warm-up speed decreases
Solution Approach 1:
The system implements feedback by detecting the actual number of fuel injections performed in each combustion cycle using drive current detection signals, comparing this with the target number of injections, and using this information to determine combustion state satisfaction. This feedback mechanism allows the system to monitor and adjust injection mode effectiveness in real-time during catalyst warm-up control.
Solution Approach 2:
The system performs self-diagnosis of the combustion state by autonomously counting the number of drive current occurrences and determining whether the combustion state is satisfactory without requiring external intervention. This self-service capability enables the system to automatically identify when single injection is being performed and assess its impact on catalyst warm-up.
2Stability of the object's composition
If single injection mode is used to prevent excessive engine speed decrease, then engine speed stability is improved, but combustion state monitoring capability deteriorates
Solution Approach 1:
The system recovers lost combustion state information through feedback by counting the actual number of fuel injections performed and comparing it with the target number. This feedback loop restores the ability to monitor combustion state even when single injection mode is used, allowing the system to distinguish between intentional single injection for stability and abnormal single injection indicating combustion deterioration.
Solution Approach 2:
The system replaces traditional mechanical or complex sensing methods for combustion state detection with an electrical measurement approach using drive current detection signals. By counting the occurrences of drive current in each combustion cycle, the system obtains accurate injection number information without requiring additional mechanical sensors or complex monitoring systems.
3Speed
If split injection mode is used during catalyst rapid warm-up control, then catalyst warm-up speed increases, but engine torque decreases and engine speed drops
Solution Approach 1:
The system applies dynamics by making the injection mode flexible and adjustable based on real-time combustion state assessment. Rather than fixed injection mode, the system can dynamically switch between single injection and split injection modes depending on whether the combustion state is satisfactory, allowing optimization of both catalyst warm-up speed and engine torque as conditions change.
Solution Approach 2:
The system changes the injection parameter (number of injections per combustion cycle) based on combustion state evaluation. When combustion state is satisfactory, split injection is used to accelerate catalyst warm-up; when combustion state deteriorates, single injection is used to maintain engine torque. This parameter adjustment resolves the contradiction between warm-up speed and engine power.
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 solution ensures that the combustion state is accurately assessed, allowing for timely adjustments in injection modes to maintain engine performance and accelerate catalyst warm-up, preventing excessive richness and deterioration, thus maintaining optimal engine operation and catalyst efficiency.
Implementation Method 1
an electromagnetic direct injector, which is configured to inject fuel into a cylinder
Data Source
AI summary
A fuel injection controller for an internal combustion engine selects as the injection mode either single injection or split injection, counts, based on a drive current detection signal, which indicates that a drive current is generated to be fed to the direct injector, the number of occurrences of the drive current in one combustion cycle as a number-of-injections count value, and determines, based on the number-of-injections count value, whether the combustion state in the cylinder is satisfactory. The fuel injection controller determines that the combustion state in the cylinder is unsatisfactory if the number-of-injections count value in one combustion cycle is one when catalyst warm-up control is being performed with the temperature of the engine being lower than or equal to a predetermined temperature.