Fuel Pressure Control Valve Energization Timing
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Solution Overview
Problem
Conventional high-pressure fuel supply control devices for internal combustion engines face challenges in maintaining accurate fuel pressure and quantity delivery due to variations in the position control of the flow rate control valve, leading to issues with drivability and exhaust gas quality.
Innovation Solution
An energy-saving high-pressure fuel supply control device that includes a high-pressure fuel pump and an electronic control unit, which logically determines the energization control of the flow rate control valve based on the pressure rise in the fuel rail, adjusting the end time of energization to compensate for deviations in the plunger's bottom dead center position, thereby ensuring consistent fuel delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the flow rate control valve is kept closed for a longer period to ensure maximum fuel supply to the fuel rail, then the fuel pressure in the fuel rail is maintained, but the energy consumption of the flow rate control valve increases
Solution Approach 1:
The ECU determines the end time of energization in advance by calculating the time when fuel pressure reaches the target value, adding a predetermined margin time. This preliminary determination allows the valve to be closed just long enough to achieve the desired pressure without excessive energy consumption.
Solution Approach 2:
The energization time of the flow rate control valve is dynamically adjusted based on the calculated end time and margin time. The control system adapts the valve closure duration to the actual fuel pressure conditions, ensuring minimum necessary energization while maintaining target pressure.
2Use of energy by moving object
If the energization time of the flow rate control valve is reduced to save energy, then the energy consumption decreases, but the fuel pressure control accuracy deteriorates due to position variations
Solution Approach 1:
The ECU calculates the end time of energization in advance by monitoring when fuel pressure reaches the target value and adding a predetermined margin time. This preliminary calculation compensates for position variations in the flow rate control valve, ensuring accurate pressure control even with reduced energization time.
Solution Approach 2:
The control system uses feedback from fuel pressure monitoring to determine when to end energization. By detecting when the target pressure is reached and applying a margin time, the system compensates for valve position variations and maintains accurate pressure control.
3Use of energy by moving object
If the flow rate control valve is closed early to reduce energy consumption, then the energy usage decreases, but the fuel quantity supplied to the fuel rail becomes insufficient
Solution Approach 1:
The ECU determines the end time of energization in advance by calculating when fuel pressure reaches the target value and adding a predetermined margin time. This ensures that the valve remains closed long enough to supply the desired fuel quantity while minimizing energy consumption.
Solution Approach 2:
The system uses feedback from fuel pressure monitoring to dynamically determine the optimal end time for energization. By detecting when the target pressure is achieved and applying a margin time, the system ensures sufficient fuel quantity is supplied while avoiding excessive energy usage.
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 solution ensures the supply of a desired fuel quantity to the fuel rail, even with position control variations, improving drivability and exhaust gas quality by maintaining target fuel pressure and reducing energy consumption.
Implementation Method 1
a solenoid valve that opens or closes the flow rate control valve 10 in accordance with an energization state or non-energization state
Implementation Method 2
pressurizes the sucked fuel during a movement of the plunger from the bottom dead center toward the top dead center
Data Source
AI summary
In an energy-saving high-pressure fuel supply control device for sucking a low-pressure fuel via a flow rate control valve and supplying high-pressure fuel acquired by pressurizing the sucked fuel to a fuel rail, at a time point that is logically decided from a bottom dead center and at which the pressure of the high-pressure fuel rises to a pressure to hold closing of the flow rate control valve, energization of the flow rate control valve is ended to restrain energization energy to the flow rate control valve. The time point when the energization of the flow rate control valve is ended is deviated toward lag side in advance by a time that causes deviation of the bottom dead center of the plunger toward the lag side from the original bottom dead center.