V-Type Engine Fuel Pump Placement for Combustion Uniformity
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Solution Overview
Problem
In V-type engines, the uneven placement of the high-pressure fuel pump causes differences in fuel pipe lengths between cylinder banks, leading to variations in fuel injection volume and pressure, which can result in uneven combustion performance and potential engine performance deterioration.
Innovation Solution
The engine design includes a fuel pump with two discharge ports, placed between the cylinder rows in a plan view from the up and down direction, to equally supply fuel to both banks, ensuring balanced fuel injection pressure and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the high-pressure fuel pump is placed on the rear side of one bank to simplify the fuel supply system, then the device complexity is reduced, but the fuel pipe lengths between the two banks become unequal, causing differences in fuel injection pressure and combustion performance
Solution Approach 1:
The fuel pump is segmented into two independent discharge ports, with each port dedicated to supplying fuel to one specific bank. This segmentation allows each bank to receive fuel through separately optimized piping paths, eliminating the need for one bank to accommodate an unevenly placed pump while maintaining simple overall system design.
Solution Approach 2:
Each discharge port of the fuel pump is specifically positioned and configured to serve its corresponding bank with optimized local piping. The first discharge port supplies the first bank through a first fuel pipe with specific length and routing, while the second discharge port supplies the second bank through a second fuel pipe with different length and routing, allowing each local path to be optimized for its specific bank rather than forcing a compromise design.
2Manufacturing precision
If the fuel pipe length is equalized between the two banks to improve combustion performance uniformity, then the combustion performance difference is reduced, but the fuel injection pressure drops due to increased flow resistance and the cost increases
Solution Approach 1:
The fuel supply system is divided into two independent paths from the two discharge ports, allowing each path to have optimally sized piping for its specific bank without being constrained by the need to equalize lengths. This segmentation enables each bank to receive fuel at the required pressure through appropriately sized pipes.
Solution Approach 2:
The system allows the fuel pipe lengths and diameters to be independently optimized for each bank based on specific requirements. Rather than forcing equal lengths, the parameters of each fuel pipe (length, diameter, routing) can be adjusted to achieve both adequate pressure delivery and combustion uniformity for each specific bank configuration.
3Manufacturing precision
If the fuel pipe length is equalized between the two banks to improve combustion performance uniformity, then the combustion performance difference is reduced, but the manufacturing cost increases due to extended flow paths
Solution Approach 1:
The fuel supply system is divided into two independent paths from the two discharge ports, allowing each path to have optimally sized piping for its specific bank without being constrained by the need to equalize lengths. This segmentation enables cost-effective piping designs that are optimized for each bank's specific requirements rather than forcing a uniform, potentially more expensive, design across both banks.
Solution Approach 2:
Each discharge port of the fuel pump is specifically positioned and configured to serve its corresponding bank with optimized local piping. The first discharge port supplies the first bank through a first fuel pipe with specific length and routing, while the second discharge port supplies the second bank through a second fuel pipe with different length and routing, allowing each local path to be optimized for its specific bank rather than forcing a compromise design.
Data Source
AI summary
[Problem] To provide, in an engine provided with two cylinder rows, a technology that, while suppressing a cost increase, can suppress a difference in combustion performance between the cylinder rows.[Solution] An exemplary engine includes: a first cylinder row having plural cylinders arranged in a front and rear direction; a second cylinder row arranged parallel to the first cylinder row; plural first injectors provided for the respective cylinders of the first cylinder row, plural second injectors provided for respective cylinders of the second cylinder row; and a fuel pump having a first discharge port to discharge a fuel to the plural first injectors and a second discharge port to discharge a fuel to the plural second injectors. The fuel pump is placed between the first cylinder row and the second cylinder row in a plan view from an up and down direction.