High-Pressure Injection Valve Control for Fuel Return
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Solution Overview
Problem
Existing high-pressure injection devices for internal combustion engines face limitations in pressure reduction due to segment-synchronous operation of the pressure reduction valve, which restricts the time available for pressure reduction and results in energy transfer losses and limited control performance.
Innovation Solution
A high-pressure injection device with a digital pressure reduction valve controlled by a unit that selectively switches and maintains the transmissive state for periods greater than one engine segment time, based on engine operating states and sensor signals, allowing extended pressure reduction and flexibility in fuel return.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure reduction valve operates segment-synchronously within a single engine segment time, then the control performance is maintained, but the pressure reduction time is limited and control flexibility is reduced
Solution Approach 1:
The patent applies dynamics by making the pressure reduction valve's operation flexible rather than strictly synchronized with engine segments. The control unit can open the valve for durations extending beyond a single segment time and can decide when to open/close the valve based on actual pressure conditions rather than fixed timing, enabling adaptive pressure control that improves both reduction time and flexibility while maintaining reliability.
2Loss of energy
If the pressure reduction valve is opened and closed within a single engine segment time, then energy transfer between pulses is avoided, but the time available for pressure reduction is insufficient
Solution Approach 1:
The patent implements continuity of useful action by allowing the pressure reduction valve to remain open across multiple engine segment times when pressure reduction is needed. Instead of being forced to close the valve within each segment time boundary, the system maintains continuous pressure reduction action over extended periods, ensuring thorough pressure control without unnecessary energy loss from frequent opening/closing cycles.
3Measurement precision
If the pressure reduction valve operates strictly in segment synchrony, then control precision is maintained, but control flexibility and adaptability are limited
Solution Approach 1:
The system dynamically adjusts the pressure reduction valve's operation based on real-time pressure conditions rather than following fixed segment-synchronous timing. The control unit can extend the valve's open state across segment boundaries and adapt the timing to actual engine conditions, maintaining precision through active control while gaining significant flexibility in when and how long the valve remains open.
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 approach enhances pressure reduction efficiency and control performance by extending the opening duration of the pressure reduction valve, enabling faster and more flexible fuel return, even at varying engine speeds and low temperatures, and supports a filter preheat function with increased pump delivery power.
Implementation Method 1
a pressure reduction valve (630) connected to the rail (600), and a fuel return line (620) connected to the pressure reduction valve (630)
Implementation Method 2
via which surplus fuel can be returned to the fuel tank of the respective vehicle
Implementation Method 3
a high-pressure pump (500), a rail (600) connected to the high-pressure pump (500) via a high-pressure fuel line (510)
Implementation Method 4
From this rail, injectors are supplied with fuel and inject the fuel, compressed to a high pressure, into the combustion chambers
Data Source
AI summary
A high-pressure injection device for an internal combustion engine to which engine segment times are assigned, having a high-pressure pump, a rail connected to the high-pressure pump via a high-pressure fuel line, at least one injector, a digital pressure reduction valve connected to the rail, a fuel return line connected to the pressure reduction valve, and a control unit. The control unit is configured to switch the pressure reduction valve into the transmissive state only in predetermined engine segment times, and to maintain said transmissive state of the pressure reduction valve for a time period which is greater than the duration of one engine segment time.