Method and device for controlling an actuator element

Details Method and device for controlling an actuator element Method and device for controlling an actuator element

1998-08-25

1999-09-28

Moulis, Thomas N.

Internal-combustion engines

Engine speed regulator

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

123502, F02D 3100

Patent

active

059571098

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

1. Background of the Present Invention
The invention relates to a process and a device for triggering an actuator, in particular a cycled actuator in a motor vehicle.
2. Background Information
German Patent Application No. 33 25 651 describes a process and device in which, to function engine speed. Such operating mode is very complicated and makes recalculation of the triggering frequency for each engine speed necessary.
Furthermore, German Auslegungsschrift 35 13 791 describes an electronic control system for internal combustion engines that comprises a stepper motor. Furthermore, German Patent Application No. 35 13 791 describes an electronic control system for internal combustion engines that includes a stepper motor. The stepper motor is triggered in cycles with a stepping frequency. The stepping frequency is changed between first and second limit values step-by-step according to a preselected time program or continuously. This stepper motor is triggered in cycles with a stepping frequency. The stepping frequency is changed between a first and a second limit values step by step according to a preselected time program or continuously.
In addition, it is known that the triggering frequency is switched between one or more values when the engine speed assumes specific values. The disadvantage in this process is that the actuator reacts to such switching processes with vibrations and/or with output signal oscillations.


OBJECT OF THE INVENTION

The object of the invention is to eliminate simply and cost-effectively fluctuations, in particular in the operating ranges presenting danger of resonance and in non-critical operating ranges. In dynamic operation, for example when rapidly driving through the resonance range, optimum actuator triggering also results, since here there is only a slight change in triggering or none at all. Because of the smooth transition in critical ranges, there are only slight effects or no effects at all on the position of the actuator. In addition, the application of the control is simplified considerably.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a block diagram of a device according to the present invention for triggering an actuator.
FIG. 2 shows a flow chart of a first exemplary embodiment of the process according to the present invention.
FIG. 3 shows the frequency of a triggering signal over time.
FIG. 4 shows a flow chart of a second exemplary embodiment of the process according to the present invention.
FIG. 5 shows a triggering frequency over time, which results from the second exemplary embodiment.
In the following, the operating mode according to the present invention is described using an example of an injection actuator in a diesel internal combustion engine. However, the procedure according to the present invention is not restricted to this application, but it can be used for all actuators that are triggered in cycles and in which resonance may occur.


DETAILED DESCRIPTION OF THE INVENTION

The start of supply of the fuel pump can be changed using the injection actuator. Usually, the process is such that the start of supply or the start of injection is controlled with the use of a control circuit, and the actuator is triggered as a function of the control deviation. Preferably the injection actuator is designed as an electro-hydraulic actuator. The injection actuator assumes different positions as a function of the pressure acting on the actuator. The pressure applied to the injection actuator can be influenced by a solenoid. A cycled signal is applied to the solenoid. The duty cycle and the frequency of the signal can be preselected.
FIG. 1 shows, as an example, the device according to present the invention in the form of a block diagram. A controlled system is identified with 100. This controlled system is preferably the injection actuator of a diesel internal combustion engine. The position of the injection actuator can be changed using actuator 110. Actuator 110 is designed as a solenoid. A cycled signal TV from triggering signal

REFERENCES:
patent: 4121547 (1978-10-01), Asano
patent: 4476832 (1984-10-01), Fujimori
patent: 4691676 (1987-09-01), Kikuchi

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