Engine Combustion Control for Catalyst Warm-Up Under Split Injection Failure
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Solution Overview
Problem
In engines with split injection and catalysts in the exhaust passage, improper fuel injection due to valve deterioration can lead to insufficient fuel supply, affecting combustion stability and catalyst activation, especially when ignition timing is retarded.
Innovation Solution
A combustion control apparatus with a control device that performs AWS control to ensure split injection and ignition timing adjustments based on catalyst and engine conditions, switching to failure-time AWS control if split injection is abnormal, ensuring fuel distribution and ignition timing for stable combustion and catalyst activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If split injection is performed with retarded ignition timing to achieve early catalyst activation, then catalyst activation is improved, but fuel injection reliability deteriorates due to repeated valve operation
Solution Approach 1:
The control device performs preliminary monitoring of the fuel injection valve's driving history and predicts potential failures before they occur. By detecting abnormal patterns in valve operation (such as increased drive time or inconsistent injection timing), the system takes preventive action by switching to alternative injection strategies or alerting the driver, thereby avoiding complete injection failure during critical warm-up periods.
Solution Approach 2:
The control device continuously monitors the actual number of injection times and compares it against expected values. When deviations are detected (such as fewer than expected injection cycles), the system provides feedback by adjusting control parameters or triggering warnings. This closed-loop monitoring ensures that catalyst warm-up is achieved while maintaining awareness of declining valve reliability.
2Stability of the object's composition
If fuel injection valve is repeatedly driven in split injection, then combustion stability is improved through fuel dispersion, but valve deterioration increases leading to improper fuel injection
Solution Approach 1:
The control device monitors the cumulative driving history of the fuel injection valve and predicts potential failures before they affect combustion quality. By detecting patterns indicating valve deterioration (such as increased response time or inconsistent injection duration), the system takes preventive action by adjusting injection parameters or alerting the driver, thereby maintaining combustion stability despite valve aging.
Solution Approach 2:
The control device continuously compares the actual number of injection times against expected values and monitors valve performance parameters. When deviations indicate valve deterioration, the system provides feedback by adjusting control strategies or triggering warnings. This ensures that combustion stability is maintained while compensating for declining valve reliability through adaptive control.
3Quantity of substance
If split injection is not appropriately performed due to valve deterioration, then fuel supply becomes insufficient, but combustion stability deteriorates
Solution Approach 1:
The control device monitors the actual number of injection times and compares it against expected values. When deviations are detected (such as fewer than expected injection cycles), the system provides feedback by adjusting control parameters or triggering warnings. This closed-loop monitoring ensures that sufficient fuel is supplied while maintaining awareness of declining injection reliability.
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
Ensures early catalyst activation and stable combustion by adjusting fuel injection and ignition timing, maintaining combustion stability even during idling operations.
Implementation Method 1
a catalyst that is disposed in the exhaust passage and purifies exhaust gas
Implementation Method 2
a spark plug that ignites an air-fuel mixture of fuel and air in the combustion chamber
Implementation Method 3
a fuel injection valve that injects fuel into the combustion chamber
Implementation Method 4
an air-fuel mixture of fuel and air in the combustion chamber
Data Source
AI summary
A combustion control apparatus for an engine can achieve early activation of a catalyst and preferable combustion. When a catalyst temperature is less than a determination temperature, an accelerated warm-up system (AWS) control is performed in which the ignition timing is retarded, and split injection is performed in which fuel injection is divided into two or more, including one injection performed within a compression stroke, and when the actual number of injections is less than a specified number for the AWS control, a split injection abnormality is determined. When the catalyst temperature is less than the determination temperature, and when the split injection abnormality is determined, a failure-time AWS control is executed in which fuel is collectively injected within an intake stroke, and the ignition timing is advanced compared to the AWS control, and retarded compared to when the catalyst temperature is greater than or equal to the determination temperature.