Injection System Pressure Control via Mode Switching
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Solution Overview
Problem
Existing injection systems for internal combustion engines face issues with excessive pressure oscillations due to air accumulation, leading to inefficient operation, increased emissions, and reduced engine efficiency, as they often require prolonged safety mode operation even after temporary pressure fluctuations.
Innovation Solution
A method that allows switching from safety operation to normal operation when pressure values return within a target range below the first pressure limit, utilizing a high pressure side pressure control valve to regulate pressure and a suction throttle as the primary pressure regulating element, ensuring efficient fuel delivery and minimizing unnecessary heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the high pressure side pressure control valve is actuated to regulate high pressure in safety operation mode, then the high pressure can be controlled to prevent exceeding the first pressure limit value, but the fuel is excessively heated causing efficiency to drop and emissions to increase
Solution Approach 1:
The control method dynamically switches between normal operation and safety operation modes based on real-time pressure monitoring. When pressure temporarily exceeds the first limit value, the system transitions to safety mode with the high pressure side pressure control valve, and automatically returns to normal operation when pressure stabilizes below a second lower limit value, preventing prolonged fuel heating
Solution Approach 2:
The system implements a feedback mechanism that continuously monitors high pressure in the accumulator and adjusts control valve actuation accordingly. The control unit compares measured pressure values against threshold values (first and second limit values) and dynamically adjusts valve position to maintain pressure within acceptable ranges while minimizing unnecessary valve operation that would cause fuel heating
2Reliability
If safety operation is maintained until the internal combustion engine is shut off, then the high pressure can be continuously regulated to prevent damage, but unnecessary heating of fuel occurs reducing engine efficiency and increasing emissions
Solution Approach 1:
The control method employs periodic pressure monitoring and threshold-based mode switching. The control unit periodically checks pressure values against the first and second limit values, transitioning between normal and safety operation modes as needed. This periodic control allows the system to exit safety mode and return to efficient normal operation when conditions permit, rather than maintaining safety mode continuously until engine shutdown
Solution Approach 2:
The system changes operational parameters by switching between two distinct operating modes with different pressure threshold settings. Normal operation uses a first pressure limit value for threshold comparison, while safety operation uses a second lower limit value. This parameter change enables the system to adapt its control strategy based on current pressure conditions, allowing efficient operation when possible and safe operation when necessary
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 enables the injection system to safely exit safety mode and return to normal operation during engine runtime, reducing fuel heating, emissions, and extending engine lifespan by effectively managing pressure oscillations and maintaining efficient operation.
Implementation Method 1
propellant, or fuel—wherein these terms are used synonymously—can be moved by way of the high pressure pump out of the fuel reservoir into the high pressure accumulator
Implementation Method 2
The flow rate of the high pressure pump can thus be influenced via the suction throttle, as can at the same time the pressure in the high pressure accumulator
Implementation Method 3
Fuel can thus be diverted from the high-pressure accumulator into the fuel reservoir via the pressure valve
Implementation Method 4
a high pressure accumulator which, on the one hand is connected fluidically with the at least one injector and on the other hand via a high pressure pump with a fuel reservoir
Data Source
AI summary
A method for operating an injection system of an internal combustion engine, including: providing the injection system includes a high pressure accumulator; regulating a high pressure in the high pressure accumulator in a normal operation by way actuating a low pressure-side suction throttle; regulating the high pressure in a first operating mode of safety operation by way of actuating at least one high pressure-side pressure control valve; carrying out a switchover from the normal operation into the first operating mode of safety operation if the high pressure reaches or exceeds a first limit pressure value; and carrying out a switchover from the first operating mode of safety operation into the normal operation if, starting from above a setpoint pressure value, the high pressure reaches or undershoots the setpoint pressure value, which is lower than the first limit pressure value.