Exhaust Catalyst Warming Based on Pre-Startup Scavenging
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Solution Overview
Problem
Existing systems fail to warm up catalysts in exhaust systems at appropriate timings, leading to potential deterioration in environmental performance and fuel efficiency.
Innovation Solution
Implement a control apparatus that executes scavenging control to flow exhaust gas through a catalyst before engine startup and warming control based on the catalyst's purification degree during scavenging, ensuring the catalyst is warmed up appropriately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the catalyst is warmed up continuously or at inappropriate timings, then the catalyst temperature increases, but environmental performance and fuel efficiency deteriorate
Solution Approach 1:
The system performs scavenging control before engine startup to advance exhaust gas through the catalyst, creating conditions for efficient warming only when necessary. This preliminary action prepares the system for optimal catalyst activation timing while avoiding unnecessary energy consumption during periods when warming is not required.
Solution Approach 2:
The control apparatus monitors the degree of purification by the catalyst during scavenging control and uses this feedback information to determine the appropriate timing for warming control. This feedback mechanism ensures the catalyst is warmed up only when it has cooled below the threshold temperature, preventing energy waste while maintaining effective purification when needed.
2Reliability
If the catalyst is warmed up at inappropriate timings, then the catalyst may be active when not needed, but environmental performance deteriorates
Solution Approach 1:
The system uses feedback from purification degree monitoring during scavenging control to make informed decisions about warming timing. This ensures the catalyst is activated only when purification is actually needed, preventing harmful emissions while avoiding unnecessary energy consumption and maintaining optimal environmental performance.
Solution Approach 2:
By performing scavenging control as a preliminary action before engine startup, the system prepares the exhaust flow path and catalyst for efficient operation. This preliminary preparation ensures the catalyst is in the optimal state for purification when the engine actually runs, improving reliability of environmental protection without unnecessary activation.
3Reliability
If scavenging control is executed, then exhaust gas flows through the catalyst, but additional control complexity is introduced
Solution Approach 1:
The control apparatus combines scavenging control and warming control into a single integrated control system that operates based on unified criteria. By merging these functions and using a single threshold temperature parameter to govern both, the system achieves reliable catalyst activation without proportionally increasing control complexity.
Solution Approach 2:
The control apparatus performs multiple functions (scavenging control, warming control, purification monitoring) using a single integrated system with unified decision-making logic. This multi-functional approach ensures reliable catalyst activation while minimizing additional complexity by avoiding separate independent control systems.
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
Prevents unnecessary warming of the catalyst, maintaining optimal performance and efficiency by warming it at the right time, thereby preventing environmental and fuel efficiency deterioration.
Implementation Method 1
The catalyst is disposed in the exhaust flow passage and configured to purify exhaust gas
Implementation Method 2
warming control that warms up the catalyst, based on a degree of purification of the exhaust gas by the catalyst
Data Source
AI summary
An intake and exhaust system includes an engine, an exhaust flow passage, a catalyst, and a control apparatus. The exhaust flow passage is coupled to the engine. The catalyst is disposed in the exhaust flow passage and configured to purify exhaust gas. The control apparatus includes one or more processors, and one or more memories coupled to the one or more processors. The one or more processors are configured to: before the engine is started up, execute scavenging control that causes the exhaust gas remaining in the engine and the exhaust flow passage to flow to pass through the catalyst before being discharged; and before the engine is started up, execute warming control that warms up the catalyst, based on a degree of purification of the exhaust gas by the catalyst during execution of the scavenging control.