Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1995-08-08
1997-01-14
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Fuel injection system
F02M 5100
Patent
active
055929214
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and a device for actuating an electromagnetic load.
BACKGROUND INFORMATION
A method and a device for actuating an electromagnetic load is known from German Patent Application No. DE A 34 26 799 (corresponding to U.S. Pat. No. 4,653 447). In the device described in this publication, the switching times, and on the basis thereof the switch-on times and switch-off times of the solenoid valve, are detected. On the basis of the variation over time of the current through the solenoid valve, the precise switching time of the solenoid valve is determined.
Such solenoid valves are used preferably for controlling the injection of fuels in petrol engines and/or diesel engines. For exact metering of even extremely small quantities for injection in particular, the switching time at which the armature of the solenoid valve reaches one of its two limit positions is of interest.
In known systems, the procedure adopted is such that in a time window within which the switching time usually occurs, the current profile is evaluated and the switching time determined on the basis of its variation over time.
An object of the present invention includes indicating, with a method and a device for actuating an electromagnetic load, a possible means of determining the switching time with a low degree of expenditure.
SUMMARY OF THE INVENTION
With the method according to the present invention and the corresponding device for actuating an electromagnetic load, it is possible to determine the switching time with a low degree of expenditure.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of the device according to the present invention.
FIG. 2 shows various signals according to the present invention plotted over time.
FIG. 3 shows a flow diagram of an exemplary method according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The exemplary embodiments according to the present invention include device for actuating electromagnetic loads, in particular in the field of fuel metering in a diesel internal combustion engine. In principle, the devices according to the present invention can be used in conjunction with any electromagnetic load. It is not restricted to the specific application described.
However, it is particularly advantageous to use the device according to the present invention in conjunction with internal combustion engines, in particular when metering fuel into a combustion space of the internal combustion engine. In this case, a solenoid valve can be used particularly advantageously for controlling the metering of fuel into the internal combustion engine. By actuating the solenoid valve, the start of injection, the end of injection, and thus the quantity of fuel injected, are determined.
In particular with small loads and high speeds of revolution, it is necessary for extremely small quantities for injection to be metered as exactly as possible. For this purpose it is in turn necessary that the time at which the armature of the solenoid valve reaches its limit position is known. This time is usually referred to as the switching time. This time can be acquired by evaluating the variation over time of the solenoid valve current.
In FIG. 1, the circuitry of the device according to the present invention is illustrated diagrammatically. Only the essential components are indicated. The positive pole Ubat of the battery is connected to ground via a series circuit comprising a load 100, in particular an electromagnetic load, a switching means 110 and a measuring device 120.
In addition, the positive pole of the battery voltage Ubat is connected to the cathode of a diode 105. The anode of the diode 105 is in contact with the connection point between the load 100 and the switching means 110. The anode of the diode 105 is connected to the cathode of a Zener diode 108. The anode of the Zener diode 108 is connected to ground.
The switching means 110 is supplied with control signals by an output stage 130. The two terminals of the mea
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Robert & Bosch GmbH
Wolfe Willis R.
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