SU1749514A1 - Method of internal combustion engine power control - Google Patents

Abstract

Usage: capacity control of internal combustion engines with cyclic phased fuel injection Essence: in power control of ICE with cyclic phased fuel injection, the amount of fuel injected on the non-disconnected operating cycle is proportional to the oxygen concentration in the exhaust gases 7 or more in proportion to the average for the previous non-disconnected operating cycles

Description

FIELD OF THE INVENTION The invention relates to engine-building, in particular to electronically controlled internal combustion engines.

A known method of controlling fuel injection with feedback on the signal of an X probe is based on integrating the signal from the output of the latter.

However, this method is used to control the power of the internal combustion engine without shutting down work cycles and is not applicable in the case of fuel injection skip, as in this case, distortion of information on the composition of the treated gases is unavoidable, due to the fact that in part of engine work cycles air is blown through the working chamber.

A known method of controlling the power of an internal combustion engine with cyclic phased fuel injection is based on disabling part of the engine's working cycles by skipping the injection. This method generates a predetermined sequence of fuel injection strokes of a certain duration and gaps in

parts of the working internal combustion engines, depending on the parameters characterizing the state of the engine. This does not take into account the output parameters of the workflow engine

The method does not exclude errors associated with errors in the measurement of the state of the engine and wear during operation. This reduces the efficiency of control, leads to deterioration of the output parameters, in particular, the exhaust gas emissions

The purpose of the invention is to reduce the toxicity of exhaust gases of internal combustion engines

The goal is achieved by the fact that, when controlling the power of an internal combustion engine with cyclic phased fuel injection, in terms of operating cycles, according to the calculated load values, the amount of fuel injected on the disconnected operating cycle is proportional to the oxygen concentration in the preceding operating cycles.

FIG. 1 shows a block diagram of an ICE power control system, the operation of which illustrates the proposed method, in FIGS. 2-6, diagrams for CCO

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operating systems; Fig, 7 is an example implementation of the reference pulse generator,

The system (FIG. 1) contains reference pulse sensor 1, counter 2, comparator 3, engine load sensor 4, analog-to-digital converter 5, D-trigger 6, element 7, amplifier 8, electromagnetic injector 9 connected to the fuel main 10 , analog switch 11, low-pass filter 12, scaling amplifier 13, exhaust gas oxygen concentration sensor 14, delay element 15 to compensate for transport delays G from the exhaust port to sensor 14.

 sensor 1 is connected to the counting C-input of the counter 2 with the C-input of trigger b and to the first input of the element And 7, The output of the sensor 4 through the converter 5 is connected to the first input of the digital comparator 3, the second input of which is connected to the output of the counter 2 and the output to D - the trigger input: - 6. The inverse output of the trigger 6 is connected to the second input of the element 7, the R input of the reset of the counter 2 and the input V of the analog key switch 11 via the element 15 of the delay 15. Information output key 11 is connected to the output of the sensor 14, and the output of the analog key 11 through the block 12 and the amplifier 13 - with the correction input of the sensor 1. The output element And 7 through the amplifier 8 is connected to the electromagnetic drive nozzle 9.

The system works as follows

The reference pulses X1 (FIG. 2) are counted by counter 2, which forms at its output the code X2 of the cycle number (FIG. 3), the counter responds to the falling edges of the pulses X1.

The sensor generates a voltage signal, the level of which depends on the load on the engine (for example, on the position of the accelerator pedal).

The signal of sensor 4 is converted to the X3 code (Fig. 3) by the converter 5 (the value of the codes X2 and X3 is conventionally shown as a deviation from the abscissa axis in Fig. 3).

In the case of storing the codes X2 and X3, the comparator 3 generates at its output a signal X4 (Fig. 4), which is sensed by trigger b on the leading edge of the next reference pulse XI. At the output of the trigger 6, a signal X5 is generated, which enables or blocks the pulse X1 through element 7 to the injector 9. The low level signal X5 resets counter 2 to 0. As shown in the example, with a load corresponding to the code (Fig. 3), the system generates five pulses

injection and the sixth skips, after which the sequence repeats. Accordingly, with a different load, for example, with, the sequence of injections will be

Next: four injections and one pass. Thus, a certain percentage of the fuel injection gaps and, consequently, a certain output power on the engine shaft are automatically aligned with the different positions of the accelerator pedal.

In duty cycles, engines with no missing fuel injection, i.e. when a logical signal level is resolved

5 passing the signal of the sensor 14 to the input 12 via the analog switch 11. As a result, the output of the block 12 generates a signal, the level of which depends on the oxygen content in the exhaust gas in non-volatile cycles (

0 non-missed fuel injection). This signal, through the scaling amplifier 13, acts on the correction input of the sensor 1. A feedback loop is formed, through which the mixture is adjusted at a predetermined level, for example, at a stoichiometry.

In duty cycles with the fuel supply turned off, the integration of the oxygen concentration sensor signal 14 is interrupted for the duration of the shutdown cycle, i.e. an injection skip cycle, which is provided in the general case by a specially formed blocking pulse. In this example, the integration is interrupted using an analog switch 11. controlled by a signal from the output of the flip-flop 6.

An example of the sensor 1 is shown

0 in FIG. 7, here 16 is the sensor input, 17 is the setpoint of the synchronization pulse generated in the predetermined phase of the working cycle of the internal combustion engine, 18-timer, controlled by voltage. The setter can be made, for example, in the form of a tag rigidly connected to the engine camshaft and a sensitive element responsive to the passage of the mark near it. It may be an optoelectronic pair that forms

0 impulse when rotating the opaque disc with a slot connected to the motor shaft.

The timer in the shown example is made on the integrated circuit KP 1006 VI1. On

5 S-input start timer (Fig. 7) receives a pulse master. In this case, the timer switches to state 1 at output 19, and the timer output 20, made in the form of an open collector transistor, is disconnected from ground and the capacitor 21 is charged from the power source En through a resistor 22. The voltage level at the input R of the timer, connected to capacitor 21, with a voltage level at the input C of the timer (the timer has an internal comparator), causes the timer to switch to O, while the output 20 is shorted to ground and the capacitor 21 is discharged. The pulse duration at the output 19 of the timer is determined by the time constant of the RC circuit 21 and 22 and the voltage level at the correction input C of the timer. Thus, deviations in the composition of the mixture formed by the injection system (Fig. 1) from the predetermined ratio are monitored by sensor 14 and compensated by increasing or decreasing the duration of the injection through the circuit of elements 11-13 so as to control the composition of the mixture at a given level.

Formula ioreoreteni

The method of controlling the power of the internal combustion engine with cyclic phased fuel injection in terms of operating cycles according to the calculated load values, characterized in that, in order to reduce the toxicity of exhaust gases, the amount of injected fuel is changed on the unclean operating cycle proportionally averaged to

prior disconnected work cycles of oxygen concentration in the exhaust gases.

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Claims (1)

Form u l eo Orete n and I A method of controlling the power of an internal combustion engine with a cyclic phased fuel injection in terms of duty cycles according to the calculated load values, characterized in that, in order to reduce the toxicity of exhaust gases, the amount of injected fuel is changed on an unconnected duty cycle proportionally to the average on the previous unconnected operating cycles of the concentration of oxygen in the exhaust gases.