Fuel Pressure Control System with Valve Opening Restriction
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Solution Overview
Problem
The existing fuel pressure control systems face challenges in preventing high pressure from being temporarily applied to target portions or release passages during fuel pressure reduction, which can lead to water hammer and increased withstand pressure requirements.
Innovation Solution
A fuel pressure control system that includes a booster pump, a pressure reducing valve, and a control device with a valve opening necessity determination unit and a restriction execution unit to control the valve opening degree of the pressure reducing valve, preventing pressure exceeding a predetermined threshold from being applied to the target portion by executing valve opening restriction control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the pressure reducing valve is opened to reduce high-pressure system fuel pressure, then the fuel pressure is reduced, but pressure exceeding the threshold may be temporarily applied to the target portion causing water hammer
Solution Approach 1:
The control device determines valve opening necessity before opening the pressure reducing valve, and executes valve opening restriction control to gradually open the valve rather than opening it abruptly. This preliminary assessment and controlled opening process prevents sudden pressure changes that would cause water hammer in the target portion or release passages.
Solution Approach 2:
The pressure reducing valve opening degree is dynamically controlled based on real-time pressure conditions. The control device adjusts the valve opening degree to maintain fuel pressure below the threshold pressure, creating a dynamic control system that adapts to changing pressure conditions rather than using a fixed opening position.
2Speed
If the pressure reducing valve is opened quickly to reduce pressure, then pressure reduction speed increases, but the withstand pressure requirement of the target portion increases
Solution Approach 1:
The control device executes valve opening restriction control that gradually increases the valve opening degree over time, rather than opening the valve quickly. This preliminary controlled opening sequence reduces pressure at a manageable rate, preventing the need for the target portion to withstand excessive pressure spikes.
Solution Approach 2:
The control device implements pressure threshold monitoring and restriction control beforehand to prevent pressure from exceeding the target portion's withstand capacity. By controlling the valve opening to maintain pressure below the threshold, the system cushions against pressure spikes that would require higher withstand pressure ratings.
Data Source
AI summary
A fuel pressure control system for a fuel supply system of an injector of an engine includes: a booster pump for increasing a high-pressure system fuel pressure; a pressure reducing valve for reducing the high-pressure system fuel pressure; and a control device for controlling the booster pump and the pressure reducing valve. The control device includes a valve opening necessity determination unit for the pressure reducing valve. The control device executes a valve opening control for opening the pressure reducing valve. The control device further includes a restriction execution unit for performing a valve opening restriction control in the valve opening control to prevent a pressure exceeding a predetermined target portion threshold pressure from being applied to a target portion.