Internal-combustion engines – Charge forming device – With fuel pump
Patent
1997-11-04
1999-03-09
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
With fuel pump
123458, F02M 3900
Patent
active
058787232
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND INFORMATION
The present invention concerns a system for controlling fuel metering into an internal combustion engine.
Such a system for controlling fuel metering into an internal combustion engine is known from DE-OS 35 40 811, where a process and a device for controlling fuel metering into an internal combustion engine, in particular a self-igniting internal combustion engine, is described. The fuel metering system described therein is referred to as a pump-nozzle system, where a cam shaft drives a pump piston in a pump cylinder. An electromagnetic solenoid valve controls the fuel flow to an element space depending on a variety of operating parameters. The pressure in the element space is not measured in this device; therefore accurate fuel metering is not possible.
Furthermore, DE-OS 34 26 799 (U.S. Pat. No. 4,653,447) discloses a process and a device for controlling fuel metering, where the beginning and the end of fuel delivery can be controlled using a solenoid valve. The beginning and the end of fuel delivery, determined by the solenoid valve, is detected by the variation of the flow through the solenoid valve.
SUMMARY OF THE INVENTION
With the procedure according to the present invention, accurate control of fuel metering into an internal combustion engine is possible.
This advantage is achieved at a low cost; in particular, no additional lines or cable connections are required between the fuel metering unit and the control.
DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of a fuel metering system according to the present invention.
FIG. 2 shows a circuit block diagram of a fuel metering device according to the present invention.
FIG. 3a shows a graph of current over time in the fuel metering device according to the present invention.
FIG. 3b shows a graph of the derivative of current over time in the fuel metering device according to the present invention.
DETAILED DESCRIPTION OF THE DRAWINGS
The process according to the present invention is explained below using the example of a pump-nozzle unit. The process according to the present invention is not limited, however, to this application. It can be used in any fuel metering system where an inductive sensor, in particular a pressure sensor, and an electromagnetic valve are used. This can also be the case, for example, in solenoid valve-controlled distributor pumps and common rail systems. The process according to the present invention can also be used with systems where the electromagnetic valve determines only the beginning or only the end of metering.
FIG. 1 shows the device according to the present invention for controlling fuel metering as a simplified block diagram. An electromagnetic solenoid valve 100, comprising a coil 105, provides communication between an element space 110, which can also be referred to as the high-pressure area, and a low-pressure area. A fuel delivery pump 115 delivers fuel from a fuel storage container 120 into the low-pressure area.
Element space 110 is formed by a pump cylinder. A pump piston 125 is arranged in pump cylinder 122. Pump piston 125 is driven by a cam 130, which is driven by a shaft. Pump piston 125 and an injection valve 135 delimit element space 110. A pressure sensor 140, comprising a coil 145, is arranged in element space 110.
This device operates as follows. Fuel delivery pump 115 delivers fuel from storage container 120 into element space 110. Cam 130, driven directly by a shaft, for example, the cam shaft of the internal combustion engine, drives pump piston 125. Pump piston 125 moves up and down depending on the position of cam 130. During its downward movement, the fuel in element space 110 is pressurized by pump piston 125. When a certain pressure is reached, injection valve 135 opens and the fuel is injected through injection nozzle 135 into the combustion chamber of the internal combustion engine.
Pressure can only build up in element space 110 when solenoid valve 100 is closed. If solenoid valve 100 is open, pressure cannot build up and therefore injection is imp
REFERENCES:
patent: 5085193 (1992-02-01), Morikawa
patent: 5201294 (1993-04-01), Osuka
patent: 5267546 (1993-12-01), Siebert et al.
patent: 5313924 (1994-05-01), Regueiro
Moulis Thomas N.
Robert & Bosch GmbH
LandOfFree
system for controlling fuel, metering into an internal combustio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with system for controlling fuel, metering into an internal combustio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and system for controlling fuel, metering into an internal combustio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1311557