Non-uniform Displacement Engine Torque Compensation
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Solution Overview
Problem
Conventional internal combustion engines with uniform cylinder displacements face challenges in balancing operational efficiency and fuel efficiency due to insufficient margin for operation point control, leading to inefficiencies in mechanical energy consumption, vibration, and noise, especially when trying to satisfy these factors within a specific operation zone.
Innovation Solution
A non-uniform displacement engine control system that uses a motor to compensate for torque differences among cylinders with varying displacements, allowing for adjustable control modes to optimize power performance based on driving conditions, thereby reducing vibration and noise, and utilizing electrical energy for more efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cylinders have uniform displacements, then it is easy to control air-to-fuel ratio and exhaust gas, but the margin for operation point control is insufficient
Solution Approach 1:
The engine is divided into multiple cylinders with different displacements (e.g., 200cc, 300cc, 400cc cylinders) instead of uniform displacements. This segmentation allows selective operation of individual cylinders based on driving conditions, providing both operational flexibility and maintained control over air-to-fuel ratio and exhaust gas for each cylinder group.
Solution Approach 2:
The engine configuration is made dynamic by allowing selective activation and deactivation of different cylinder groups based on operating conditions. The system can transition between different cylinder combinations (e.g., operating only 400cc cylinders at high load, or combining 200cc+300cc+400cc cylinders at low load), enabling adaptation across various operation points while maintaining proper air-to-fuel control.
2Device complexity
If cylinders have fixed displacement, then the structure is simple, but excessive mechanical energy is consumed to secure stable idling
Solution Approach 1:
The engine dynamically adjusts which cylinders are active based on operating conditions. During idle conditions, only the smallest displacement cylinders (e.g., 200cc) are activated, minimizing mechanical energy consumption. During high-load conditions, larger displacement cylinders (e.g., 400cc) are activated to provide sufficient power. This dynamic cylinder selection maintains structural simplicity while optimizing energy usage across different operating regimes.
Solution Approach 2:
The system changes the operational parameters by selectively activating different cylinder groups based on load requirements. At idle, only essential cylinders with smaller displacements operate, reducing energy consumption. As load increases, additional cylinders with larger displacements are activated to meet power demands, thereby optimizing the balance between structural simplicity and energy efficiency.
3Productivity
If non-uniform displacement cylinders are used, then operational efficiency and fuel efficiency are improved, but vibration and noise are generated due to displacement imbalance
Solution Approach 1:
Cylinders are segmented into different displacement groups (e.g., 200cc, 300cc, 400cc) that can be selectively activated. This segmentation allows the system to operate with balanced cylinder combinations in certain conditions (reducing vibration and noise) while maintaining the ability to use non-uniform displacement configurations when operational efficiency and fuel efficiency are prioritized.
Solution Approach 2:
The system dynamically changes operational parameters by selecting which cylinder groups are active. When vibration and noise are concerns, the system may activate only cylinders of the same displacement (e.g., only 400cc cylinders or only 200cc+300cc cylinders), creating a balanced configuration. When performance is prioritized, non-uniform configurations are used, allowing parameter adjustment to balance harmful factors against efficiency gains.
4Adaptability or versatility
If operation point control is frequently adjusted, then adaptability is improved, but control efficiency is reduced due to vibration and noise limitations
Solution Approach 1:
The engine is segmented into discrete cylinder groups with different displacements that can be independently controlled. This segmentation enables clear, distinct operation modes (e.g., idle mode with only 200cc cylinders, cruising mode with 200cc+300cc cylinders, high-power mode with all cylinders), making operation point control more efficient by reducing the complexity of continuous adjustment while maintaining high adaptability across different driving conditions.
Data Source
AI summary
A user interface apparatus for controlling a vehicle comprising a non-uniform displacement engine comprising at least two sizes of cylinders having different displacements, a motor connected to a driving shaft of the engine, and a motor controller for controlling the motor, the user interface apparatus includes an input for selecting a control mode of the non-uniform displacement engine and the motor, an interface controller communicating with the motor controller such that the motor is controlled in the selected control mode, and a display device for displaying information about the selected control mode, wherein the user interface apparatus has a control mode for controlling the motor to compensate for a difference in torque due to different displacements of the cylinders such that a sum of engine torque and motor torque in explosion stroke of each cylinder is uniform.