Cylinder Deactivation Ignition Timing Control for Torque Shock Reduction
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Solution Overview
Problem
Existing cylinder deactivation systems face issues with torque variation shocks and misfires when changing operation modes from deactivated-cylinder to all-cylinder mode, particularly due to destabilization of combustion caused by retarding ignition timing and increased internal EGR gas.
Innovation Solution
A cylinder deactivation change apparatus that includes fuel supply and ignition control systems, utilizing an electronic control unit to manage ignition timing and fuel injection strategies, such as igniting before mode change and injecting fuel in the compression stroke to stabilize combustion and reduce torque shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If ignition timing is retarded when changing from deactivated-cylinder mode to all-cylinder mode, then torque variation shock is reduced, but misfire is caused due to destabilization of combustion state
Solution Approach 1:
The system performs preliminary action by determining the necessity of mode change before actually changing from deactivated-cylinder mode to all-cylinder mode. This allows the ECU to prepare appropriate ignition timing and fuel injection strategies in advance, preventing combustion instability and misfire while still achieving smooth torque transition.
Solution Approach 2:
The system applies parameter changes by adjusting ignition timing based on the determined necessity of mode change. When mode change is determined to be necessary, the ECU controls ignition timing to be retarded compared to normal operation, which reduces torque variation shock while maintaining combustion stability through coordinated fuel injection control.
2Ease of operation
If ignition timing is retarded to reduce torque shock, then smooth transition is achieved, but misfire occurs due to combustion destabilization
Solution Approach 1:
The system determines whether mode change is necessary before executing the transition, allowing preliminary preparation of ignition timing and fuel injection parameters. This preliminary determination ensures that retarding ignition timing for smooth transition does not cause misfire, as the system can coordinate multiple control parameters in advance.
Solution Approach 2:
The system uses feedback by continuously monitoring engine operation state and determining whether mode change is necessary based on current conditions. This feedback mechanism allows the ECU to adjust ignition timing and fuel injection strategies dynamically, ensuring smooth transition while preventing combustion instability and misfire.
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
The apparatus effectively reduces the likelihood of misfires and maintains consistent engine torque by stabilizing combustion and controlling ignition timing and fuel injection during mode changes, thereby improving operational efficiency.
Implementation Method 1
ignition parts configured to ignite a fuel-air mixture in the first combustion chamber and a fuel-air mixture in the second combustion chamber
Data Source
AI summary
A cylinder deactivation change apparatus including fuel supply parts supplying fuel into a first and second combustion chambers of a first and second cylinders, ignition parts igniting fuel-air mixture in the first and the second combustion chambers and a microprocessor. The microprocessor is configured to perform determining whether changing the operation mode is necessary, and controlling the fuel supply parts and ignition parts so as to ignite at first ignition timing before it is determined that changing the operation mode to the first mode is necessary, and so as to ignite at second ignition timing retarded in comparison with the first ignition timing and so as to supply the fuel into the first combustion chamber in a manner that causes a stratified charge combustion in the first combustion chamber, when it is determined that changing the operation mode to the first mode is necessary.