Internal Combustion Engine Control for Delayed Combustion
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Solution Overview
Problem
Abnormal combustion in internal combustion engines, such as pre-ignition, knock, and misfire, can cause engine damage due to fluctuations in boundary conditions and component malfunctions, necessitating effective prevention and prediction methods.
Innovation Solution
A control system with sensors to measure combustion signals and a controller to determine conditions like misfire or delayed combustion, adjusting fueling and ignition to mitigate these issues, using cylinder-specific controls to prevent subsequent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time combustion monitoring and cylinder-specific control adjustments are implemented, then engine reliability is improved by preventing abnormal combustion, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The control system implements cylinder-specific control, dividing the engine into individual cylinders with independent monitoring and control. Each cylinder is equipped with sensors and control mechanisms that operate independently to detect and respond to abnormal combustion events, allowing targeted interventions without affecting other cylinders.
Solution Approach 2:
The system performs preliminary detection of combustion abnormalities using sensors that monitor combustion events in real-time. When misfire or abnormal combustion is detected, the control system preemptively adjusts fuel injection and ignition timing for subsequent combustion cycles before damage can occur, preventing rather than merely responding to problems.
2Measurement precision
If combustion signals are monitored and analyzed for each cylinder, then measurement precision of combustion conditions is improved, but device complexity increases due to multiple sensors and signal processing requirements
Solution Approach 1:
The control system uses a universal controller that handles monitoring and analysis for all cylinders through a single integrated unit. This multi-functional controller processes combustion signals from multiple cylinders, performs pattern recognition, and executes control decisions, eliminating the need for separate dedicated systems for each cylinder while maintaining high measurement precision.
Solution Approach 2:
The system uses sensors to create electrical copies or representations of the physical combustion events in each cylinder. These electrical signals are then processed and analyzed by the controller, allowing precise measurement of combustion conditions without requiring direct physical intervention in each cylinder.
3Reliability
If fueling amount is reduced for predetermined number of combustion cycles following abnormal combustion, then engine damage is prevented, but productivity decreases due to temporary reduction in fuel efficiency
Solution Approach 1:
When abnormal combustion is detected, the control system applies preliminary anti-action by reducing fueling amounts for a predetermined number of subsequent combustion cycles. This preventive measure counteracts the potential for further abnormal combustion events and engine damage, even though it temporarily reduces fuel efficiency. The system prioritizes protecting the engine from catastrophic failure over maintaining peak performance during the recovery period.
Data Source
AI summary
A control system for an internal combustion engine includes at least one sensor configured to measure a combustion signal within at least one cylinder of a plurality of cylinders within the internal combustion engine. The combustion signal corresponds to a first combustion cycle. The control system also includes a controller operably connected to the at least one sensor. The controller is configured to receive the combustion signal from the at least one sensor and determine whether the measured combustion signal satisfies at least one condition associated with the internal combustion engine. The at least one condition corresponds to the at least one of engine misfire or delayed combustion. The controller is further configured to, based on the determination, reduce a fueling amount to the at least one cylinder for a predetermined number of combustion cycles following the first combustion cycle.