Integrated Fuel Pump Housing Pressure Control
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Solution Overview
Problem
Existing high-pressure fuel pump systems face challenges in compactness and efficiency due to the external placement of pressure relief valves, pressure sensors, and pressure control valves, which can lead to space constraints and reliability issues under varying engine conditions.
Innovation Solution
A compact fuel pump housing integrates a pump manifold, pressure control valve, pressure sensor, and pressure relief valve, with a mechanically driven camshaft actuating fuel plunger pistons orthogonally, enabling efficient pressure control and relief within a single unit, including a 'limp home' capability after overpressure events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pressure relief valves, pressure sensors, and pressure control valves are placed externally to the fuel pump housing, then ease of manufacture and maintenance are improved, but device complexity and space requirements increase
Solution Approach 1:
The patent integrates the pressure relief valve, pressure sensor, and pressure control valve directly into the fuel pump housing structure. The pressure relief valve is formed as an integrated component within the housing, the pressure sensor is mounted on the housing interior surface, and the pressure control valve is positioned within the housing cavity, thereby consolidating multiple external components into a single integrated unit that reduces overall system complexity while maintaining manufacturing feasibility
Solution Approach 2:
The fuel pump housing is designed to serve multiple functions simultaneously: it contains the pumping mechanism, houses the pressure relief valve, mounts the pressure sensor, and positions the pressure control valve. This multi-functional design eliminates the need for separate external housings or mounting structures for each component, thereby reducing device complexity without compromising ease of manufacture
2Ease of repair
If pressure relief valves, pressure sensors, and pressure control valves are placed externally to the fuel pump housing, then ease of repair is improved, but device compactness deteriorates
Solution Approach 1:
The pressure relief valve, pressure sensor, and pressure control valve are nested within the fuel pump housing cavity. The pressure relief valve utilizes the housing wall as part of its structure, the pressure sensor is mounted on the interior surface of the housing, and the pressure control valve is positioned within the available housing space, thereby achieving a compact nested arrangement that maintains serviceability while minimizing overall volume
3Reliability
If all pump components are integrated within a single housing, then device compactness and reliability are improved, but ease of manufacture deteriorates
Solution Approach 1:
While integrating multiple components within a single housing, the design maintains functional segmentation where each component (pumping mechanism, pressure relief valve, pressure sensor, pressure control valve) remains distinct and independently serviceable. The housing provides a unified structure that contains all components, improving reliability through integrated sealing and reduced connection points, while the segmented internal arrangement allows for standardized manufacturing of individual components that can be assembled into the housing
4Ease of operation
If pressure control components are placed externally, then ease of operation is improved, but space requirements increase
Solution Approach 1:
The pressure control valve, pressure relief valve, and pressure sensor are merged into the fuel pump housing, eliminating the need for separate external mounting spaces. The integrated arrangement allows all pressure control functions to be operated and monitored from a single location, improving ease of operation while significantly reducing the total space required for the fuel pump system
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
The integrated system enhances fuel pressure modulation, reduces variability, and ensures reliable operation by containing all necessary components within a single housing, improving compactness and reliability, particularly in space-constrained applications like diesel engines.
Implementation Method 1
a cam shaft adapted to reciprocatingly drive fuel plunger pistons orthogonally with respect to the camshaft to create discrete pumping events
Implementation Method 2
a pressure relief valve responsive to excessive fuel pump manifold pressure to open in response to excessive fuel pressure
Implementation Method 3
a pressure control valve contained within the housing
Implementation Method 4
a sensor contained within the housing
Data Source
AI summary
A fuel pump manifold pressure control system may be effective to provide a compact and more effective fuel pump mechanism for compression ignition engines, such as diesel and some natural gas engines. The fuel pump manifold pressure control system includes a fuel pump manifold, at least one fuel injection accumulator adapted for supplying pressurized fuel to at least one fuel injector, a pressure control valve, a pressure sensor, and a pressure relief valve, all contained within a compact fuel pump housing. The pressure control valve and pressure sensor are each adapted for signal communication with electronic controller, and for fuel communication with the fuel pump manifold. The pressure relief valve is adapted for fuel communication with the fuel pump manifold. Each of the control valve, sensor, and relief valve are fixedly mounted to and internally contained within the housing.