Dual Pump Fuel Supply System for Variable Pressure Control
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Solution Overview
Problem
Existing fuel supply systems for internal combustion engines face limitations in fuel pressure variability, leading to inefficiencies in atomization, flow range, and increased costs due to complex configurations and high drive losses, especially during varying engine loads.
Innovation Solution
A fuel supply system comprising a low-pressure fuel pump and a high-pressure fuel pump connected in series, with independent motor-driven operation, and pressure adjustment devices to manage fuel pressure dynamically, allowing for variable fuel pressure settings without the need for additional sensors or complex piping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant pressure fuel supply system is used, then the system configuration is simple and cost-effective, but the fuel atomization and flow range are limited
Solution Approach 1:
The fuel supply system is segmented into two independent pump units: a low-pressure fuel pump and a high-pressure fuel pump. Each pump can operate independently or in combination, allowing the system to provide different pressure levels (low pressure mode, high pressure mode, or combined mode) to achieve variable fuel pressure and improved atomization without requiring a completely complex system redesign
2Adaptability or versatility
If a high pressure fuel pump with variable pressure control is used, then fuel atomization and injection amount are optimized, but the system cost increases due to additional sensors and complex modifications
Solution Approach 1:
The high-pressure fuel pump is designed with multi-functionality to serve multiple purposes: it can operate independently to provide high-pressure fuel injection, or work in combination with the low-pressure pump to provide variable pressure control. This eliminates the need for separate high-pressure and low-pressure pump systems, reducing overall system complexity and cost while maintaining the capability for optimized fuel atomization and injection control
3Reliability
If the fuel pump is always driven to maintain fuel pressure, then fuel supply stability is ensured, but drive loss increases especially during low engine load conditions
Solution Approach 1:
The system implements dynamic pressure control by independently controlling the operation of the low-pressure fuel pump and high-pressure fuel pump based on actual engine conditions. During low-load conditions, only the necessary pump operates at reduced pressure, minimizing drive loss. During high-load conditions, both pumps can operate to provide higher pressure. This dynamic adaptation ensures fuel supply stability while reducing energy waste during partial-load operation
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 configuration enables a responsive fuel supply system that minimizes drive losses, reduces costs, simplifies piping, and improves fuel efficiency by allowing selective pressure settings, even during engine idling, while maintaining stable vapor lock resistance.
Implementation Method 1
a low pressure fuel pump (1) and a high pressure fuel pump (3) which are respectively driven by motors (M)
Data Source
AI summary
A fuel supply system includes a low pressure fuel pump, which suctions and discharges fuel accumulated in a fuel tank, and a high pressure fuel pump, which suctions and discharges the fuel discharged from the low pressure fuel pump and supplies the fuel to a fuel injection valve installed in an internal combustion engine, the low pressure fuel pump, high pressure fuel pump, and fuel injection valve being connected in series, wherein the low pressure fuel pump and high pressure fuel pump are configured in such a way as to be driven or stopped independently of each other, one by each motor, and the pressure of the fuel discharged from the high pressure fuel pump is made variable by a combination of the drive or stop of the low pressure fuel pump and the drive or stop of the high pressure fuel pump.