Variable Combustion Cylinder Ratio Control for Engine Speed Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine technologies experience significant engine speed fluctuations due to varying cylinder deactivation intervals when variably controlling the combustion cylinder ratio, complicating individual torque management and increasing noise and vibration.
Innovation Solution
A variable combustion cylinder ratio control method and device that maintains a constant cylinder deactivation interval by changing the combustion cylinder ratio by adjusting the pattern such that the value of N changes by one at a time, ensuring the cylinder deactivation interval changes only by one cylinder, thereby reducing engine speed fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the combustion cylinder ratio is variably controlled by changing cylinder deactivation patterns, then the adaptability of the engine to different operating conditions is improved, but the engine speed fluctuation increases due to varying cylinder deactivation intervals
Solution Approach 1:
The patent segments the cylinder deactivation pattern into a standardized repeating cycle where combustion is performed in N cylinders followed by deactivation of one cylinder. This segmentation creates a consistent modular pattern that maintains stable engine speed while allowing the combustion cylinder ratio to be varied by changing the value of N.
Solution Approach 2:
The patent changes the parameter N (number of consecutive combustion cylinders) to vary the combustion cylinder ratio. By adjusting N while maintaining the deactivation interval pattern, the system achieves adaptable combustion cylinder ratios without causing engine speed fluctuation, as the deactivation interval remains consistent.
2Stability of the object's composition
If individual torque management is performed for each cylinder to reduce engine speed fluctuation, then the engine speed stability is improved, but the device complexity increases
Solution Approach 1:
The patent makes the system self-service by using the natural cylinder deactivation pattern itself to maintain engine speed stability. The standardized pattern of N combustion cylinders followed by one deactivated cylinder automatically provides stable engine operation without requiring additional torque management interventions, thus reducing device complexity.
3Power
If the cylinder deactivation interval is made long to increase torque generation, then the power output is improved, but the engine speed fluctuation increases
Solution Approach 1:
The patent introduces dynamics by allowing the parameter N to be adjusted based on operating conditions. This enables the system to optimize between power output and engine speed stability dynamically - N can be increased for higher torque generation when needed, while the standardized deactivation pattern ensures engine speed fluctuation remains controlled.
Data Source
AI summary
A variable combustion cylinder ratio control method variably controls a combustion cylinder ratio of an engine during an intermittent deactivation operation, in which cylinder deactivation is intermittently performed. The method includes, when setting N to an integer greater than or equal to 1, repeatedly performing a cylinder deactivation in a pattern in which combustion is consecutively performed in N cylinders in the order of cylinders entering a combustion stroke, and then a subsequent cylinder is deactivated. The method further includes changing the combustion cylinder ratio by changing the pattern such that the value of N is changed by one at a time.