Internal-combustion engines – Charge forming device – With fuel pump
Patent
1997-03-27
1999-03-09
Miller, Carl S.
Internal-combustion engines
Charge forming device
With fuel pump
25112915, F02M 3704
Patent
active
058787224
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND INFORMATION
The present invention concerns a method and an apparatus for controlling an electromagnetic load (device). From the German Patent Application No. DE-O 44 15 361, a method and an apparatus for controlling an electromagnetic load are known. Such electromagnetic loads are intended in particular to control the fuel metering in internal combustion engines. A solenoid valve establishes the injection duration in this process.
In solenoid valves, a certain time span normally passes between the drive time point and the reaction of the solenoid valve. This time span is normally known as the switching time of the valve. This switching time is a function of various parameters, such as the coil temperature and the current flowing through the coil. A variable switching time of the solenoid valve results in turn in a variable injection duration and thus in a changing injected fuel quantity.
SUMMARY OF THE INVENTION
The underlying object of the present invention is to increase the accuracy in a method and an apparatus for controlling the injected fuel quantity in an internal combustion engine.
With the method and the apparatus according to the present invention, the accuracy of the fuel metering can be significantly improved.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of the apparatus according to an embodiment of the present invention.
FIG. 2 shows a detailed block diagram of an embodiment of the present invention.
FIG. 3a illustrates exemplary drive signals plotted over time according to an embodiment of the present invention.
FIG. 3b illustrates a first current signal plotted over time according to an embodiment of the present invention.
FIG. 3c illustrates the state of a solenoid valve plotted over time according to an embodiment of the present invention.
FIG. 4a illustrates a first drive signal plotted over time according to an embodiment of the present invention.
FIG. 4b illustrates a second drive signal plotted over time according to an embodiment of the present invention.
FIG. 4c illustrates a second current signal plotted over time according to an embodiment of the present invention.
FIG. 4d illustrates the state of a solenoid valve plotted over time according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described hereafter based on the example of an apparatus for controlling the fuel quantity to be injected into an internal combustion engine. However, it is not restricted to this application. It can be used whenever the drive duration of an electromagnetic load (device) is to be controlled. This is particularly useful when the drive duration establishes a quantity such as the volumetric flow of a medium flowing through the solenoid valve.
In FIG. 1, a solenoid valve is designated as 100. A first terminal of the coil of the solenoid valve 100 is connected to a supply voltage Ubat. A second terminal of the coil of the solenoid valve is connected to ground via a switching means 110 as well as a current-measuring means 120. The switching means is preferably realized as a transistor. The current-measuring means is preferably an ohmic resistance, the voltage drop across the ohmic resistance being evaluated for current measurement.
The switching means 110 has a drive signal A applied to it. As long as the drive signal A assumes a high level, the switching means 110 closes and thus enables the flow of current through the load. The drive signal A is provided by an OR element 130. The OR element 130 combines the output signal B of a control unit 140 and the output signal t.sub.v of a time extension unit 150. The output signal B of the control unit 140 and the output signal of a current determiner 160 are fed to the time extension unit 150. The current determiner 160 evaluates the voltage drop across the resistor 120.
The control unit 140 computes, based on signals not shown, a drive signal B for application to 110 enabling the flow of current through the load 100. After the current flows through the solenoid v
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Gandert Volker
Gras Jurgen
Kienzler Rainer
Konrad Alfred
Kretzschmar Matthias
Miller Carl S.
Robert & Bosch GmbH
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