Electronic control device for controlling the fuel quantity of a

Internal-combustion engines – Charge forming device – Including means responsive to instantaneous change in engine...

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Details

123419, 36443108, F02D 4114, F02D 4110, F02D 4134

Patent

active

049933892

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

In motor vehicles, bucking vibrations having a disturbing effect on the behavior of the motor vehicle are frequently imparted by the interaction of internal combustion engine, elastic suspension and masses capable of vibrating. Such vibrations can also be excited by acceleration or deceleration (overrun operation).
From German published patent application No. 2,906,782, a device for damping bucking vibrations in an internal combustion engine is known. This is based on the concept that the bucking vibrations are associated with distinctly measurable fluctuations in the speed. These speed fluctuations are derived with the aid of the differentiated speed signal. The differentiated speed signal itself is then fed to the fuel quantity control system to counteract the bucking vibrations with the fuel correction signal, which counteracts the bucking vibrations, being a definite function of a speed-dependent signal.
The known device, which directly intervenes in the fuel quantity control system, does not satisfy all operational conditions of a motor vehicle or of an internal combustion engine connected therewith because connecting the differentiated speed signal to the fuel quantity control system can also lead to instabilities in the control loop.
The invention has the object of providing a method for damping bucking in internal combustion engines by means of which, on the one hand, the bucking vibrations are effectively damped, especially during acceleration and in the overrun condition but which, on the other hand, does not directly intervene in the fuel quantity control system.


ADVANTAGES OF THE INVENTION

Compared with the prior art mentioned, the method according to the invention has the advantage of being simple to implement since there is no intervention in the fuel quantity control system. A further advantage can be seen in restricting the speed range in which the bucking damping is to be performed, since this measure saves computing time in the case of control systems having a microcomputer.


DRAWING

The invention will be illustrated in detail and explained with reference to the following drawing.
FIG. 1 shows the internal combustion engine with the elements necessary for controlling it,
FIGS. 2(A-D) diagrammatically show the operation of the method in the case of acceleration, in the overrun mode and the signal variation of the speed, of the first and the second derivative of the speed during bucking and with fluctuations in uniform speed.
FIGS. 3(A-C) show the sequence of the method steps by means of a flow chart,
FIG. 4 is used for explaining the flow chart according to FIG. 3,
FIG. 5 shows the elements necessary for carrying out the method in a block diagram,
FIG. 6 shows an implementation of the decision stage,
FIG. 7 shows a decision stage with the restriction of the speed range, and FIG. 8 shows an implementation for negative and positive values of dn/dt.


Description of the Embodiments

In FIG. 1, 10 designates an electronic control device, 11 an internal combustion engine and 12 an output stage for controlling an actuating device 13. The electronic control device is supplied with sensor signals via inputs 14 to 17. A speed signal is present at input 14, a signal proportional to the fuel quantity Q.sub.K is present at input 15, but the signals of the beginning of injection or of a controlled distance transmitter are also conceivable. 16 designates an accelerator pedal position transmitter, 17 relates to input signals of, for example, the air temperature, the fuel temperature, the engine temperature or the throttle flap position, 18 identifies a group of output signals which include, for example, the beginning of injection or the control rod position. The fuel quantity signal is emitted at output 19. In modern control devices, the electronic control device 10 contains a microcomputer which is connected via interface chips to the input and the output signals. In addition to the microcomputer, various storage units are provided in the control device. Naturally, it is also conceivable

REFERENCES:
patent: 3789816 (1974-02-01), Taplin et al.
patent: 4112879 (1978-09-01), Assenheimer et al.
patent: 4197767 (1980-04-01), Leung
patent: 4266447 (1981-05-01), Heess et al.
patent: 4271798 (1981-06-01), Seitz et al.
patent: 4811224 (1989-03-01), Kuerschner et al.

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