Digital High-Pressure Pump Control for Particle Dislodging
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Solution Overview
Problem
High-pressure pumps in internal combustion engines can be hindered by particles, which prevent proper operation, and existing control methods, such as PWM and peak and hold signals, are ineffective in dislodging these particles, especially in digital pumps.
Innovation Solution
A method for controlling a digital high-pressure pump involves checking external parameters, applying an electrical detachment control signal with specific phases to move the piston and valve, and repeating the signal during fuel intake and delivery phases to dislodge trapped particles, ensuring efficient pressure delivery to the common rail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a peak and hold control signal is used to control a digital high-pressure pump, then the pump can be controlled synchronously with the engine cycle, but it becomes difficult to dislodge trapped particles in the valve
Solution Approach 1:
The patent applies periodic anti-attachment control signals during engine starting procedures to dislodge particles. The method uses repeated cycles of high-pressure pump actuation with specific timing (e.g., 5-10 cycles at 10-20 Hz) to create dynamic forces that eject trapped particles from the valve, combining periodic mechanical action with pressure variations.
Solution Approach 2:
The patent changes operational parameters by applying elevated fuel pressure (higher than normal operating pressure) during the anti-attachment procedure. The control signal modifies the pressure profile and timing characteristics temporarily during engine starting to enhance particle dislodging while maintaining normal operation parameters during steady-state running.
2Reliability
If PWM control signal is used for analog high-pressure pump, then particle dislodging can be attempted, but digital pumps cannot use this control method
Solution Approach 1:
The patent replaces the electrical PWM control mechanism with a mechanically-based anti-attachment procedure using fuel pressure and piston motion. Instead of using electrical pulse width modulation to control valve opening, the method uses dynamic fuel pressure variations and mechanical piston reciprocation to achieve particle ejection in digital pumps.
Solution Approach 2:
The patent creates a universal anti-attachment solution that works across different pump types (analog and digital) by using a mechanically-based approach rather than type-specific electrical control. The method adapts to both PWM-controlled analog pumps and peak-and-hold controlled digital pumps through a common mechanical action on the fuel and valve system.
3Stress or pressure
If the high-pressure pump operates continuously during starting procedure, then fuel pressure can be maintained, but trapped particles cannot be eliminated
Solution Approach 1:
The patent introduces dynamic variations in pump operation during the anti-attachment procedure. Instead of continuous steady-state operation, the system applies varying pressure profiles, adjusts pump actuation frequency, and creates dynamic reciprocating motion to generate forces that eject particles while maintaining adequate fuel pressure for engine starting.
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 method effectively dislodges particles, ensuring the high-pressure pump operates correctly by applying an optimized electrical detachment control signal, enhancing the chances of successful engine starting and maintaining proper fuel pressure.
Implementation Method 1
a piston (204) which is able to move between a first position and a second position, allowing the fuel in the high-pressure pump to be pressurized towards its high-pressure output (203)
Implementation Method 2
a valve (206) which is able to move from a first position to a second position, the second position making it possible to keep the fuel pressurized in order to be delivered into a common rail through its high-pressure output (203)
Data Source
AI summary
A method for controlling a digital high-pressure pump, the control method including the following consecutive steps when the internal combustion engine does not manage to start during the starting procedure: checking the external parameters of the internal combustion engine; measuring a physical parameter at the high-pressure output, applying an electrical detachment control signal as a replacement for the electrical control signal to the high-pressure pump during the starting procedure when the physical parameter measured at the high-pressure output is less than or equal to a reference value, and stopping the starting procedure after a given time when the physical parameter measured at the high-pressure output is greater than the reference value.