Process and device for controlling an internal combustion engine

Details Process and device for controlling an internal combustion engine Process and device for controlling an internal combustion engine

1998-04-06

2000-08-08

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

12340619, 123198F, F02D 1702, F02D 4300

Patent

active

060985925

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a method and an arrangement for controlling an internal combustion engine.


BACKGROUND OF THE INVENTION

EP 27 865 A1 discloses switching out and switching in at least one cylinder of a multi-cylinder internal combustion engine in pregiven operating states of the vehicle or the engine (that is, interrupting the metering of fuel to the cylinder and resuming the metering of fuel). In this known arrangement, the position of an electrically actuable throttle flap is shifted abruptly to compensate the torque change, which is generated because of switching the cylinder out, in order to maintain the torque essentially constant which is outputted by the engine. In this known arrangement, the switching in and switching out of the cylinders can be perceived by the driver notwithstanding the change of the throttle flap position as a consequence of the slowness of the air intervention inherent to the system.


SUMMARY OF THE INVENTION

It is an object of the invention to configure the transition into an operation with cylinder switchoff and vice versa in such a manner that the driving comfort is not affected and that the engine torque, which is outputted by the engine, is maintained essentially constant even in the transition.
A method and an arrangement for controlling an internal combustion engine is known from U.S. Pat. Nos. 5,556,178 and 5,657,238 wherein a unified engine torque interface is utilized. A torque command, which is supplied via this torque interface, is realized via slowly changing interventions (charge) and/or rapid interventions (injection suppression and ignition angle). No measures are provided in connection with the switching off of a pregiven number of cylinders, preferably the switching off of a cylinder bank, in the idle range and in the part-load range.
DE 43 34 864 A1 discloses a control method and a control arrangement for an internal combustion engine wherein the abrupt torque change is reduced when switching on and switching off a cylinder via suitable synchronization of ignition angle correction and injection suppression.
When switching off and switching on at least one cylinder of a multi-cylinder engine in the part-load range, the torque, which is outputted by the engine, is maintained essentially constant for unchanged pedal position and engine rpm via the coordination of the ignition intervention, charge intervention and injection intervention. The driving comfort is therefore not affected by switching on and switching off the cylinders.
The application of this procedure in combination with the switching on and switching off of cylinder banks in engines having a large number of cylinders is especially advantageous.
It is especially advantageous that the driver command (the torque wanted by the driver) is realized independently of the switching on or switching off of individual cylinders. Here, no perceptible comfort deteriorations occur during the dynamic operation.
It is especially advantageous that external interventions on the engine (for example from a drive slip control or a transmission control) can be realized likewise independently of the switching in and switching off.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in greater detail with respect to the embodiments shown in the drawing. Here,
FIG. 1 shows an overview block circuit diagram of a control arrangement for an internal combustion engine; whereas, in
FIG. 2, an overview block circuit diagram of the procedure of the invention is shown. In the block circuit diagrams of
FIGS. 3 to 9, different embodiments of the procedure provided by the invention are described.


DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

In FIG. 1, a control apparatus for a multi-cylinder internal combustion engine 10 is shown. The control arrangement includes an electronic control apparatus 12 which comprises at least one microcomputer 14, an input unit 16 and an output unit 18. Input unit 16, output unit 18 and microcomputer 14 are logically coupled to each other via

REFERENCES:
patent: 5459662 (1995-10-01), Tezuka et al.
patent: 5479898 (1996-01-01), Cullen et al.
patent: 5692471 (1997-12-01), Zhang
patent: 5769054 (1998-06-01), Schnaibel et al.

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