V-Configuration Turbocharged Engine Cylinder Bank Deactivation
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Solution Overview
Problem
Large displacement internal combustion engines experience low energy efficiency and increased pollutant emissions during low-load operations due to oversized power delivery, as they generate a limited fraction of their maximum power, which is not effectively utilized during normal driving conditions.
Innovation Solution
A turbocharged internal combustion engine with a 'V' cylinder configuration that deactivates one bank of cylinders during low-load operations by using an electronic control unit to cut off fuel injection and lubricating oil supply to the corresponding turbocharger, allowing the remaining cylinders to operate more efficiently and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large displacement engine is used to generate high maximum power, then the engine can deliver high power output, but the engine operates at low energy efficiency and high pollutant emissions during low-load operations
Solution Approach 1:
The engine is divided into two independent banks of cylinders (bank 3a and bank 3b), each with its own turbocharger. This segmentation allows one bank to be deactivated while the other remains operational during low-load conditions, enabling the engine to maintain high power capability when needed while improving efficiency during partial load operation.
2Power
If a large displacement engine is used to generate high maximum power, then the engine can deliver high power output, but the engine produces high pollutant emissions during low-load operations
Solution Approach 1:
The engine is divided into two independent banks of cylinders (bank 3a and bank 3b), each with its own turbocharger. This segmentation allows one bank to be deactivated while the other remains operational during low-load conditions, enabling the engine to maintain high power capability when needed while improving efficiency during partial load operation.
3Device complexity
If a single turbocharger is shared between two banks of cylinders, then the device complexity is reduced, but the turbocharger experiences excessive stress and reliability decreases
Solution Approach 1:
The engine is divided into two independent banks of cylinders (bank 3a and bank 3b), each with its own turbocharger. This segmentation allows one bank to be deactivated while the other remains operational during low-load conditions, enabling the engine to maintain high power capability when needed while improving efficiency during partial load operation.
Solution Approach 2:
Each bank of cylinders is equipped with its own dedicated turbocharger, allowing independent control and optimization of turbocharging for each bank. This local quality approach ensures that when one bank is deactivated, its turbocharger is not subjected to excessive stress or oil infiltration, thereby improving reliability.
4Reliability
If lubricating oil is supplied to the turbocharger during bank deactivation, then the turbocharger is protected, but lubricating oil infiltration occurs causing reliability issues
Solution Approach 1:
The lubricating oil supply to each turbocharger is dynamically controlled based on the operational status of the corresponding cylinder bank. During deactivation of a bank, the lubricating oil supply to the associated turbocharger is interrupted, preventing oil infiltration issues while maintaining protection during active operation.
Data Source
Figure 1
Figure 2
AI summary
An internal combustion engine (1) having: a plurality of cylinders (2), which are arranged in two banks (3a, 3b) arranged at an angle relative to one another; for each bank (3a, 3b) of cylinders (2), a corresponding turbocharger (8) having a lubrication circuit (14), which is provided with a delivery duct (15) to feed lubricating oil under pressure into the turbocharger (8); and a control unit (18), which is suited to deactivate the cylinders (2) of one of the two banks (3a, 3b) during the low-load operation and interrupts the feeding of lubricating oil to the turbocharger (8), when the corresponding bank (3a, 3b) of cylinders (2) is deactivated.