SU1312210A1 - Method for controlling internal combustion engine - Google Patents

Abstract

The invention relates to the automatic regulation of internal combustion engines and allows for an improved method reliability. The electromagnet 7 of the harmonic oscillator is connected to one end of the fuel metering body 8, the other end of which is connected to the control levers 10 of the centrifugal rotational speed controller. When adjusting the engine, the rotational speed of the camshaft 11 is measured. The fuel metering body 8 is given harmonic oscillations proportional to the rotational speed of the shaft 11 and the number of cylinders to be shut off. The number of cylinders to be disconnected is determined by the frequency of the electromagnet 7. When the electromagnet is turned off / the speed mode is maintained by the controller through lever 10. 7 sludge. (L

Description

113

The invention relates to the regulation of internal combustion engines.

The purpose of the invention is to increase reliability.

Fig. 1 shows the nature of the harmonic oscillations of the fuel metering authority as a function of the relative fuel cycle through the angle of rotation of the camshaft cf. for example, turning off half the cylinders of a four-stroke six-cylinder diesel engine with the order of 1-5-3-6-2-4; figure 2 - then zher with off all cylinders; on fig.Z - the same, with the shutdown of a single cylinder; FIG. 4 is the same, with a limited cyclic fuel supply to three of six cylinders; in FIG. 3 - the same, with a single cylinder running and with variable switching off of the cycle feed therein; FIG. 6 - the same with all working cylinders and with variable cycle switching off in them; in fig. 7 is a device diagram for implementing the method.

Figures 1-6 in figure 1-6 correspond to the cylinder numbers ".

The harmonic oscillation generator comprises an electromagnet 1 connected to one end of the fuel metering body 8, the second end of which is connected via spring 9 to the control lever 10 of the centrifugal regulator of the engine rotation frequency. The camshaft 11 of the fuel pump 12 is connected to the engine crankshaft.

The method is implemented as follows.

The engine speed measures the rotational speed of the camshaft 11.

The fuel metering body 8 is set to harmonic oscillations by supplying a pulsating current oscillator to the electromagnet 7 of the oscillator, and the harmonic oscillation frequency is proportional to the rotational speed of the camshaft and the number of cylinders to be disconnected. than the fuel feed dispensing unit .8, the oscillations are not transmitted to the control lever 10. In this mode, the individual engine cylinders are shut off. Number of disabled

five

0

five

1.02.

the cylinder is determined by the frequency of the current supplied to the electric magnet 7 "when the electromagnetic is switched off 7, as well as when the motor speed changes abruptly (e.g. .100% load shedding), the centrifugal frequency regulator maintains the set speed through the lever 10 ,

In the process of regulation, a signal is generated on the magnitude of the cycle feed q, transferred to the metering body 8 to change its position and turn off part of the cylinders.

To completely shut off part of the cylinders, it is necessary to fulfill additional conditions. S The movement of the fuel metering body 8 of the fuel pump 12 must begin.

t

from the position corresponding to the zero feed.

Depending on the law of movement of the fuel metering body 8, it is possible to implement two options for disabling part of the cylinder.

The frequency of oscillation of the fuel metering body 8 may be a multiple of the frequency of rotation of the camshaft

thirty

V fn.

()

where V is the oscillation frequency of the organ 8 of the fuel metering unit;

n is an integer multiplier. In this case, part of the cylinders of the multi-cylinder engine is constantly turned off, t, e, the same effect is achieved as when disconnecting a group of cylinders (for example, by raising and fixing the plungers of the fuel injection pump).

The magnitude of the multiplier n in the formula () varies widely and depends on the engine's tact, the number of cylinders, and the number of cylinders to be shut off.

In addition, the frequency of oscillations of the organic fuel metering unit 8 can be chosen equal to

V fa, (2)

where a is a non-integer multiplier, 55 Due to this choice of oscillation frequency, each cylinder is disconnected periodically after a predetermined number of cycles (the period of

3 131 is determined by the value of the multiplier). This avoids undesirable effects (skipping flares, increased carbon formation, etc.). when turning on previously disabled cylinders to work.

Consider the example of turning off half of the cylinders (figure 1). In order to make such adjustments, the fuel metering body 8 is given an oscillatory movement from a position corresponding to zero flow, with a frequency of

V

3f,

where V is the oscillation frequency of the body 8 fuel metering unit; f is the rotational speed of the engine camshaft.

At such a frequency of oscillation, three cylinders operate at 100% fuel supply, and three cylinders at zero feed (figure 1).

Consider the example of turning off all cylinders (figure 2). To switch off, it is necessary to give the body 8 of the top pumping to oscillate from a position corresponding to zero flow, with a frequency of V 6f.

At such a frequency of oscillation, the fuel supply to all cylinders is stopped.

 Let us consider an example of switching off any number of cylinders (fig. 3), for example, one cylinder. The oscillation frequency of the fuel metering body 8 is equal to V f.

Let us consider an example of limiting the supply of fuel to a part of cylinders (Fig; 4). In order to carry out this type of regulation, oscillatory movement of the fuel metering body 8 is performed from a position with a reduced supply (for example, 25%) to a position with a repeated supply (for example, 100%). In Figure 4, pok azan is an example of such an adjustment, in which three cylinders operate at a supply of 100%, and three cylinders operate at a supply of 25%.

Let us consider an example with a variable switching off of the suit of cylinders (figures 5 and 6). For this type of adjustment

04

The fuel metering body 8 is given an oscillatory movement with a frequency that is not a multiple of the rotational speed of the camshaft. For example, consider the case where the body of 8 fuel metering imparts an oscillatory displacement with a frequency equal to V 3.05f. .

When this is due to the addition of frequency

Fluctuations of the fuel feed metering body 8 and the fuel feed frequency (where the fuel feed frequency is the ratio of the camshaft rotation frequency to the number of cylinders) differential beats occur. The fuel delivery rate of each cylinder changes from zero to a maximum with a period T of 1200 ° (for a frequency of 3.05f).

The law of change in the fuel supply of one cylinder is shown in Fig. 5, the scheme for changing the fuel supply in all cylinders is shown in Fig. 6.

. The use of the method allows to increase the reliability of the engine. Since there is no need for additional shut-off equipment, it becomes possible both to permanently turn off the cylinders and turn them off after a certain number

cycles, and also to regulate the engine Tejib not only in idle and partial load modes, but also in transient conditions (reset and load drop).

Claims (1)

Invention Formula The method of regulating the engine, internal combustion by measuring rotational frequency, generating a signal about the magnitude of the cycle feed, transferring it to the fuel metering body to change its position and turn off the fuel supply to cylinders on low-cycle feed modes, characterized in that, in order to increase reliability, the fuel metering body is given harmonic oscillations with a frequency proportional to the rotation frequency. The motor shaft and the number of cylinders disconnected, while the amplitude of oscillation is set from the zero-feed position. loo m fxi / .i / NaV 0do 20Sh i / O Jfi Iro zw float of distribution shaft 0ua /, 2 (7 W f WO Fi.b 56ff n.p.B. VNIIPI Order 1945/29 Circulation 504 Random polygons avenue, Uzhgorod, st. Project, 4 Subscription