US 2008/0269984 A1 · Method for Controlling a Fuel Supplying Device of an Internal Combustion Engine

Abstract

Disclosed is a fuel supplying device of an internal combustion engine, comprising a low-pressure circuit, a high-pressure pump coupled to the low-pressure circuit and conveys fuel into a fuel reservoir, a volume flow control valve assigned to the high-pressure pump, an electromechanical pressure regulator connected to the fuel reservoir and the low-pressure circuit and can direct fuel from the fuel reservoir into the low-pressure circuit, a regulating mechanism which generates an actuation signal for the volume flow control valve by a first controller in a first mode which generating an actuation signal for the electromechanical pressure regulator with the aid of a second controller in a second mode. The mode of the fuel supplying mechanism is switched in accordance with a fuel pressure error value resulting from a detected fuel pressure and a predefined fuel pressure. The mode can additionally be switched according to the throughput of the high-pressure pump.

Claims18

Dependent claims

1-9. (canceled)

A method for controlling a fuel supplying device of an internal combustion engine, comprising:

connecting a fuel input to a high-pressure fuel pump having a volume flow control valve to a low-pressure fuel circuit;
pressurizing the fuel by the high-pressure fuel pump;
delivering the pressurized fuel into a fuel accumulator;
connecting an electromechanical pressure regulator to the fuel accumulator and the low-pressure fuel circuit where the electromechanical pressure regulator is configured to stop the flow of fuel from the fuel accumulator into the low-pressure fuel circuit;
determining a control deviation from a difference between a specified fuel pressure and a detected fuel pressure;
generating in a first operating mode a regulating signal for the volume flow control valve by a first regulator;
providing in the first operating mode the control deviation to the first regulator;
generating in a second operating mode a regulating signal for the electromechanical pressure regulator by a second regulator;
providing in the second operating mode the control deviation to the second regulator;
and
switching from:
the first operating mode to the second operating mode if the detected fuel pressure is greater than the specified fuel pressure by a first specified amount or a first specified factor, or
the first operating mode to the second operating mode if the delivery flow of the high-pressure pump is less than a lower switch-over threshold of the delivery flow, or
the second operating mode to the first operating mode if the delivery flow of the high-pressure pump is greater than an upper switch-over threshold of the delivery flow.

11 more elements

A method for controlling a fuel supplying device of an internal combustion engine, comprising:

connecting a fuel input to a high-pressure fuel pump having a volume flow control valve to a low-pressure fuel circuit;
pressurizing the fuel by the high-pressure fuel pump;
delivering the pressurized fuel into a fuel accumulator;
connecting an electromechanical pressure regulator to the fuel accumulator and the low-pressure fuel circuit where the electromechanical pressure regulator can stop the flow of fuel from the fuel accumulator into the low-pressure fuel circuit;
determining a control deviation from a difference between a specified fuel pressure and a detected fuel pressure;
generating in a first operating mode a regulating signal for the volume flow control valve by a first regulator;
providing in the first operating mode the control deviation to the first regulator;
generating in a second operating mode a regulating signal for the electromechanical pressure regulator by a second regulator;
providing in the second operating mode the control deviation to the second regulator;
and
switching from:
the second operating mode to the first operating mode if the detected fuel pressure is less than the specified fuel pressure by a second specified amount or a second specified factor, or
the first operating mode to the second operating mode if the delivery flow of the high-pressure pump is less than a lower switch-over threshold of the delivery flow, or
the second operating mode to the first operating mode if the delivery flow of the high-pressure pump is greater than an upper switch-over threshold of the delivery flow.

11 more elements

A method for controlling a fuel supplying device of an internal combustion engine, comprising:

connecting a fuel input to a high-pressure fuel pump having a volume flow control valve to a low-pressure fuel circuit;
pressurizing the fuel by the high-pressure fuel pump;
delivering the pressurized fuel into a fuel accumulator;
connecting an electromechanical pressure regulator to the fuel accumulator and the low-pressure fuel circuit where the electromechanical pressure regulator can stop the flow of fuel from the fuel accumulator into the low-pressure fuel circuit;
determining a control deviation from a difference between a specified fuel pressure and a detected fuel pressure;
generating in a first operating mode a regulating signal for the volume flow control valve by a first regulator;
providing in the first operating mode the control deviation to the first regulator;
generating in a second operating mode a regulating signal for the electromechanical pressure regulator by a second regulator;
providing in the second operating mode the control deviation to the second regulator;
and
switching from:
the first operating mode to the second operating mode if the detected fuel pressure is greater than the specified fuel pressure by a first specified amount or a first specified factor, or
the first operating mode to the second operating mode if the delivery flow of the high-pressure pump is less than a lower switch-over threshold of the delivery flow, or
the second operating mode to the first operating mode if the delivery flow of the high-pressure pump is greater than an upper switch-over threshold of the delivery flow,
wherein the lower switch-over threshold of the delivery flow and the upper switch-over threshold of the delivery flow are determined from an error value of a leakage flow through the volume flow control valve in a closed position and a leakage flow from the fuel accumulator if the electromechanical pressure regulator is closed and no fuel is to be delivered.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/547,941Filed 23 Feb 2005

Priority

DE 10 2004 016 943.86 Apr 2004

Published

30 Oct 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

F02D 41/3863
Controlling the fuel pressure: by controlling the flow out of the common rail, e.g. using pressure relief valves
F02D 41/3017
According to or using specific or several modes of combustion: characterised by the mode being used
F02D 41/3845
Controlling the fuel pressure: by controlling the flow into the common rail, e.g. the amount of fuel pumped
F02M 59/366
By variably-timed valves controlling fuel passages to pumping elements or overflow passages: valves being actuated electrically

Method for Controlling a Fuel Supplying Device of an Internal Combustion Engine

Life of this patent

Method for Controlling a Fuel Supplying Device of an Internal Combustion Engine

Life of this patent

Abstract

Claims18