Internal Combustion Engine Cylinder Group Control
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Solution Overview
Problem
Existing internal combustion engines lack the ability to simultaneously operate some cylinders in spark ignition and compression ignition modes within a single engine cycle, limiting adaptability to different fuel octane numbers and efficiency.
Innovation Solution
The implementation of multiple throttle valves and independent spark plug systems for each cylinder, allowing for separate control of inlet pressure, airflow, and fuel injection parameters across different cylinders or groups, enabling a combination of spark ignition and compression ignition modes based on real-time conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single throttle valve is used to control inlet pressure and airflow for all cylinders, then the device complexity is reduced, but the adaptability to different fuel octane numbers and combustion modes is limited
Solution Approach 1:
The patent divides the single throttle valve into multiple independent throttle valves, with each throttle valve controlling inlet pressure and airflow for specific cylinders or cylinder groups. This segmentation enables different cylinders to operate in different combustion modes (spark ignition or compression ignition) simultaneously, resolving the contradiction between adaptability and device complexity.
2Manufacturing precision
If independent control systems are provided for each cylinder, then the control precision for combustion mode switching is improved, but the device complexity increases
Solution Approach 1:
The patent implements local quality by providing independent electronic ignition systems and control parameters for each cylinder, allowing precise control of ignition timing and phase angle for spark ignition modes. Meanwhile, compression ignition cylinders share common control parameters, balancing control precision with system complexity.
3Productivity
If all cylinders operate in the same combustion mode, then the device complexity is minimized, but the thermal power conversion efficiency is limited
Solution Approach 1:
The patent enables dynamic operation where cylinders can switch between spark ignition and compression ignition modes based on real-time operating conditions such as load, speed, and fuel type. This dynamic adaptability optimizes thermal power conversion efficiency across different operating ranges while managing system complexity through conditional control logic.
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
This approach enhances engine adaptability to various fuel octane numbers, improves thermal power conversion efficiency, and reduces fuel consumption by allowing cylinders to operate in the most efficient combustion mode, whether spark ignition or compression ignition, within a single engine cycle.
Implementation Method 1
each cylinder is provided with an independent spark plug electronic ignition system
Implementation Method 2
other cylinders have high inlet pressure and large inlet air flow, after air is fully compressed in the cylinders, the fuel is injected into the cylinders and ignited using compression ignition combustion control method
Data Source
AI summary
A control method of an internal combustion engine and an internal combustion engine applying the same. Each cylinder is provided with a throttle valve, or a plurality of paralleled throttle valves are employed to supply air for different cylinders or cylinder groups, so that different cylinders are provided with different inlet pressure and inlet airflow, different spark ignition timing (phase angle), different injection timing (phase angle), and different injection quantity, and in a complete work cycle, some cylinders of the engine operate under a compression ignition combustion mode, and some cylinders of the engine operate under a spark ignition combustion mode. When the conditions for compression ignition combustion mode are satisfied, the cylinders adopt the compression ignition combustion mode as much as possible, so as to improve the thermal power efficiency of the engine. The internal combustion engine or vehicle installed with the control method has wide adaptability to different fuel with different ignition points, can detect the octane number of gasoline, and consume various octane number gasoline.