High-Pressure Fuel Pump Suction Valve Control
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Solution Overview
Problem
High-pressure fuel pumps face a challenge in maintaining responsiveness of the suction valve when the pump's pressure or capacity is increased, leading to decreased discharge efficiency due to the strengthening of spring force, which affects the timely closure of the suction valve and potential fuel return to the suction side.
Innovation Solution
A high-pressure fuel pump design that includes a rod to urge the suction valve open, a mover to drive the rod for valve closure, and a solenoid generating a magnetic attraction force to ensure the suction valve reaches the closing position before moving into the opening direction, maintaining responsiveness even with increased pressure or capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the spring force is strengthened to handle increased pressure or capacity, then the pump can maintain high pressure or large capacity, but the responsiveness of closing the suction valve decreases
Solution Approach 1:
The suction valve control mechanism is segmented into two independent components: a suction valve spring for holding the valve open, and a solenoid actuator for closing the valve. This segmentation allows the spring force to be strengthened for high pressure/capacity while the solenoid provides rapid closing action independently, resolving the contradiction between maintaining valve openness under high pressure and achieving rapid closure responsiveness.
Solution Approach 2:
The solenoid acts as an intermediary device between the control signal and the suction valve closure. Instead of relying solely on the spring force for closure, the solenoid mediates the closing action, enabling rapid response independent of the spring strength. This intermediary mechanism allows the spring to be optimized for holding the valve open under high pressure while the solenoid ensures rapid closure when needed.
2Strength
If the spring force is strengthened, then the suction valve can remain open under increased fluid force, but the discharge efficiency lowers due to delayed valve closure
Solution Approach 1:
The valve control function is segmented into two phases: the spring maintains the valve open during the suction stroke, and the solenoid closes the valve during the discharge stroke. This segmentation allows the spring force to be strengthened for handling increased fluid force during suction, while the solenoid ensures timely closure during discharge to maintain efficiency, resolving the contradiction between strength and productivity.
Solution Approach 2:
The solenoid is activated in advance to close the suction valve before the discharge stroke begins, preventing fuel from returning to the suction side. This preliminary action ensures that even with strengthened spring force, the valve closure timing is optimized for discharge efficiency, eliminating the productivity loss that would otherwise result from delayed closure.
3Speed
If the drive current or energization time is increased to improve responsiveness, then the suction valve closing responsiveness improves, but the system complexity and energy consumption increase
Solution Approach 1:
The solenoid actuator replaces a purely mechanical spring-based closure system with an electromechanical system. This substitution enables precise control of valve closure timing through electrical signals without requiring complex mechanical linkages or adjustments. The solenoid converts electrical energy directly into mechanical motion for rapid valve closure, improving responsiveness while keeping the control system relatively simple through straightforward electrical actuation.
Solution Approach 2:
The solenoid allows for easy adjustment of valve closure timing by changing electrical parameters such as drive current magnitude and energization duration. Instead of requiring complex mechanical adjustments to improve responsiveness, the system simply changes electrical parameters, reducing device complexity while achieving the desired speed improvement in valve closure.
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 ensures the suction valve can be effectively closed at the necessary timing, maintaining discharge efficiency and preventing fuel return to the suction side, even with increased pressure or capacity, by utilizing the magnetic attraction force and spring forces in a coordinated manner.
Implementation Method 1
a solenoid that generates a magnetic attraction force to move the mover in the valve closing direction
Implementation Method 2
a rod that urges a suction valve in a valve opening direction
Data Source
AI summary
Provided is a high-pressure fuel pump in which responsiveness of closing a suction valve can be maintained even when the high-pressure fuel pump is increased in pressure or capacity of the high-pressure fuel pump is increased, thereby ensuring discharge efficiency. Therefore, the high-pressure fuel pump includes the rod that urges the suction valve in the valve opening direction, the mover that drives the rod in the valve closing direction, and the solenoid that generates a magnetic attraction force for moving the mover in the valve closing direction. After the suction valve starts moving from the suction valve closing position in the valve opening direction, the rod reaches the suction valve closing position and further moves in the valve opening direction.