Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1992-03-30
1993-11-30
Nelli, Raymond A.
Internal-combustion engines
Engine speed regulator
Idle speed control
F02M 300
Patent
active
052655709
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method and an arrangement for controlling the air supply to an internal combustion engine
BACKGROUND OF THE INVENTION
Such a method and such an arrangement are known from the DE-OS 26 54 455. There, an electrical controller is proposed which, dependent on a pregiven and a measured parameter of the motor vehicle, generates a control signal for controlling the air supply to the internal combustion engine via a throttle flap. For this purpose, a delay or filter element is provided in the control line which is to ensure a smooth transition of the measured parameter value to the pregiven value in the event of changes of the pregiven value. Should a change of the pregiven value occur, which is greater than a threshold value, then this delay or filter element delays the control signal of the control unit as a function of time; whereas, the control signal arrives unchanged at the throttle flap in the case of changes below the threshold value. Such a procedure enables the desired smooth transition to be achieved, but minor fluctuations or changes in the pregiven value act, without being influenced, on the position of the throttle flap and therefore on the speed and output of the internal combustion engine, which can cause a deterioration of the driving comfort, in particular during the idling condition. Major changes, however, come into effect only after a delay, and this means a loss in dynamics of the open-loop/closed-loop control system.
It is therefore the task of the invention to create a method or an arrangement for controlling the air supply to an internal combustion engine with the maximum possible dynamics and improved driving comfort This task is solved by the procedure described in the characterizing parts of the independent patent claims. For this purpose, the speed of changing of the actuating element position and of the drive signal for the actuating element for controlling the air supply is changeable by influencing a filter characteristic and/or the transfer behavior of a filter according to the value or signal to be filtered and the filtered value or signal.
From U.S. Pat. No. 4,924,835, a method for filtering the load signal and/or the basic quantity of a fuel metering device is known. In that process, an insensitivity range is formed around the measured, uninfluenced load signal; by means of a window comparator, the filtered signal is compared with the limits of this insensitivity range, and the filtering action is switched off when the filtered signal leaves the insensitivity range.
From British Patent 1,603,921, a system for the electronic control of the throttle flap position of an internal combustion engine, dependent on a value pregiven by the accelerator pedal, is known. For the improvement of the operating behavior of the internal combustion engine, a limitation of the speed of changing of the throttle flap position is undertaken by means of a filter which is arranged between the position controller and the throttle flap drive.
SUMMARY OF THE INVENTION
The procedure in accordance with the invention has the advantage, that quiet running and driving comfort of the motor vehicle are improved, particularly in the range of the idling condition, since changes of smaller amplitudes and higher frequencies do not have any effect, while the control system can follow changes of larger amplitude with a high speed. A further advantage is to be seen in that the procedure in accordance with the invention makes it possible to achieve the improvements without intervention in the controller structure.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of an arrangement for the control of the air supply to an internal combustion engine, while FIG. 2 represents a flowchart of the procedure according to the invention. FIGS. 3A and 3B describe, by way of example, the occurring signals as functions of time.
DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION
FIG. 1 shows an internal combustion engine 10 with a throttle flap 14 locate
REFERENCES:
patent: 4924835 (1990-05-01), Denz
patent: 5121726 (1992-06-01), DiNunzio et al.
patent: 5131360 (1992-07-01), Muschalik
patent: 5134978 (1992-08-01), Binnewies et al.
patent: 5161502 (1992-11-01), Fritz
patent: 5170761 (1992-12-01), Kato et al.
patent: 5172666 (1992-12-01), Nonaka
patent: 5184588 (1993-02-01), Kato et al.
Schnaibel Eberhard
Schneider Erich
Nelli Raymond A.
Ottesen Walter
Robert & Bosch GmbH
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