DE3601661A1 - Electrical control device for the speed control of an internal combustion engine - Google Patents

Abstract

Electrical speed-control device for an internal combustion engine, a reference value signal being fed to a speed governor 5, which is connected to an output stage 7, to the output of which a solenoid 9 is connected, operating the adjusting member of the internal combustion engine, the internal combustion engine being provided with a tachometer, the signal from which together with the reference value signal is fed to the speed governor 5, a current regulator 19 being connected between the speed governor 5 and the output stage 7 assigned to the latter, in order to improve the stability of the control circuit, to which current regulator a signal for the magnitude of the current flowing through the solenoid 9 is fed in addition to the output signal from the speed governor 5. <IMAGE>

Description

LINDE AKTIENGESELLSCHAFT

Λ 85/012-II

A 736 DP-St / As

January 21, 1986

Electrical control device for speed control of a Internal combustion engine

The invention relates to an electrical control device for regulating the speed of an internal combustion engine according to The preamble of claim 1, wherein the internal combustion engine, preferably a piston internal combustion engine, in particular a piston engine with speed regulation by mixture metering, that is, a burning engine in which a fuel-air mixture is generated either in a carburetor and via a throttle valve the flow of the fuel-air mixture flowing into the combustion chambers is set or in an analogue mixture formation device a mixture of propellant gas and air is formed and the mixture flow is adjusted.

A disadvantage of the facilities specified in the preamble is that when parameters are changed, the control

3Q stretch, for example, changing the motor behavior the temperature or the outside air pressure, change of the magnetic force with the temperature with the same supply voltage, Change in mechanical friction on the throttle valve or other mechanical parts of the actuator or changing the spring preload of the return spring of the

• ♦ *

Magnets Stabi I iätsprob I one of the regulation can occur .

The invention is based on the object of improving a speed controller according to the preamble in such a way that at
If a disturbance of the type mentioned occurs in the regulated state of the speed control device, the stability of the control loop is improved.

¹⁰ This object is achieved by the feature specified in the characterizing part of the patent claim. By according to
The current feedback achieved by the invention reduces the time constant of the electromagnet. This results in a significant improvement in the dynamics and the

¹⁵ Stability of the control loop. It should be noted that the regulation of a low-pass time constant is known per se, but it is used in an electrical speed control device with a magnet as the actuator
New. The arrangement according to the invention significantly reduces the stability problems that arise when parameters of the controlled system are changed, in particular because the controller has an integral component
should own.

The invention is explained in more detail below with reference to the drawing.

Figure 1 shows a representation of the previously known state

of technology in a symbol circuit diagram.
30th

Figure 2 shows a similar symbol of the circuit diagram
Circuit according to the invention.

35

A setpoint value signal for the speed of rotation in the drawing under 3 flows via a line 1 from a setpoint generator, which is no longer shown in the drawing symbolized internal combustion engine. This through the Line 1 flowing signal flows to a summing element 2, from which a signal is fed through line 4 to the speed controller 5, from which through a line a signal flows to the output stage 7, which through a line 8 to the electromag forming the actuator neten 9 is connected, via a mechanical Ver binding 10 is connected to the mixture metering device 11, from which the mixture flows through a pipe 12 to the internal combustion engine 3, to which Shaft 14 mechanical power is delivered. the Parts 9 to 12 and 3 form a controlled system that is carried out by the field 13 is symbolized. The speed of the shaft 14 of the internal combustion engine 3 is measured in a speed measuring device 15, from which through a line 16 a signal is fed to the summing element 2.

The same parts are also found in the device according to the invention shown in FIG. Additionally However, a device is provided here by which the current flowing through the electromagnet 9 is measured and the measured value signal is fed through the line 17 to a summing element 18 which is connected between the speed controller 5 and an additionally provided current controller 19, this current controller 19 in turn between the speed controller 5 or the summing member 18 on the one hand and the output stage 7 on the other hand ge is switched.

The drawing shows both the structure of the previously known speed control loops with a low-pass register, the main delay elements of which are the electromagnet and form the internal combustion engine, as can be seen, as well as the structure of the speed control loop according to the invention, in the case of the essential change in an additional Current controller and a current feedback exists that the Current controller is switched on.

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Claims (1)

LINDE AKTIENGESELLSCHAFT A 85/012-II A 736 DP-St / As January 21, 1986 Claim Electrical control device for speed control an internal combustion engine, preferably a piston ,. Scheme, by,. internal combustion engine mi t / Germ schdosi augmentation wherein one, at whose output a the adjusting member of the internal combustion engine actuatable electromagnet is connected randomly or depending on another variable to a speed controller is supplied switched J stellbares setpoint signal, which is connected to an output stage and wherein the internal combustion engine is provided with a tachometer, the signal of which is fed to the speed controller together with the setpoint signal, characterized in that a current controller (19) is arranged between the speed controller (5) and the output stage (7) assigned to it, to which, in addition to the output signal of the speed controller ( 5) a signal for the size 3Q of the current flowing through the electromagnet (9) is fed.