SU1523704A1 - Device for automatic control of ignition in ic engine - Google Patents

Abstract

The invention relates to devices for controlling the working process of an internal combustion engine, in particular by influencing the parameters of the spark discharge of an ignition system. The aim of the invention is to increase the reliability of the device by reducing the number of elements operating in the limiting modes, while at the same time increasing the accuracy of the adjustment. A block 17 of pulse-phase control, a selector 12 of maximum duration, a counter 14, an AND-NE element 15, an OR element 18, a reversible counter 16, a preset unit 23 are entered into the device. In addition, the rectifier 2 is controllable. The device provides maximum sparking energy in the engine starting mode and maintaining the optimum sparking energy in the operating mode. 2 Il.

Description

The invention relates to devices for controlling the working process of an internal combustion engine, and to devices for automatically controlling the ignition of a combustible mixture of an engine by acting on the spark parameters of a system for ignition.

The aim of the invention is to increase the reliability of the device by reducing the number of elements operating in the limiting modes, while at the same time improving the accuracy of regulation.

Fig, 1 shows a block diagram of the device; Fig. 2 shows an example of the execution of a preset unit.

The device contains a voltage converter 1, a controlled reamer 2, a storage capacitor 3, an ignition coil 4 with a primary winding 5, a thyristor 6, a control unit 7, an input bus 8 from an interrupter, an ignition indicator 9, sensor 10 engine rpm, converter 11 frequency - voltage, selector 12 of maximum duration, first generator 13, voltage controlled, first counter 14, first element NE 15, reversible counter -16, block 17 pulse-phase control, element OR 18, the second generator 19, are controlled voltage, the second counter 20 inverter 21 and the second element IS-NOT 22. The pre-installation unit 23 contains element 2 AND 24, capacitor 25, resistor 26, two elements IS-NOT 27 and 28, resistor 29, and common bus 30. The voltage converter 1 is connected through -., - cut controlled rectifier 2 to a circuit consisting of a series-connected storage capacitor 3 and the primary winding 5 of the ignition coil 4, in parallel with which the thyristor 6 is turned on, the control electrode of which is connected to the output of the unit 7 control, the control input of which is connected the input bus 8 from the chopper, the output of the engine speed sensor 10 through the converter 12 of maximum duration and the input of the first generator 13 controlled by the voltage, the output of which is connected to the counting input of the first counter 14, the output of the higher bit of which through NOT 15 is connected to the input about

0

five

0

five

0

five

0

five

0

five

Reverse counter 16 is counted. The pulse-phase control unit 17 is connected by its outputs to the inputs of the controlled rectifier, and the inputs to the output of the reversing counter 16 and the inputs of the OR element 18, the output of which is connected to the second input of the first AND-15 element 15, the output the ignition indicator 9 is connected to the information input of the selector 12 of maximum duration, the direct and inverse outputs of which are connected respectively to the reset input of the first counter 14 and to the direct count input of the reversible counter 16. Selector 12 m xmaximal duration Consists of a second counter 20, a counting input connected to the output of a second generator 19, controlled by a voltage, the input of which is the control input of the selector I 12 of maximum duration, the high discharge output of the second counter 20 is connected to the forward output of the selector 12 of maximum duration , through the inverter 21 with the inverse output of the selector 12 of maximum duration and with the first input of the second element. AND-NOT 22, the output of which is connected to the reset input of the second counter 20, the information input of the selector 12 of maximum duration is connected to the second input of the second element, AND- NOT 22. The presetting unit 23 has one input connected to the high-voltage transfer output of the reversing the counter 16, to the D inputs and the prerecord input of which the first and second outputs of the presetting unit 23 are connected, the first output of which is connected via a resistor 29 to the power bus, and the second output is an output element and 2 and 24, the first input of which is the input of unit 23, and the second input through series-connected elements AND-NOT 27 and 28 and a resistor 26, in parallel with which the capacitor 25 is connected, is connected to the common bus 30.

The device works as follows.

When the power is turned on, a digital code is recorded in the reversible counter 16 from its information inputs corresponding to the minimum phase of the control pulses, i.e. maximum conduction angle of thyristors

controlled rectifier 2 (pre-installation circuit of the reversible counter 16 with its information inputs are shown in FIG. 2). The pulsed-phase control unit 17 on the control electrodes of the thyristors of the controlled rectifier 2 outputs pulses, the phase of which is proportional to the number, the digital code of which is recorded in the reversing counter 16 and fed to the inputs of the pulsed-phase unit 17

management With the minimum phase of the control pulses of the z.a d of the storage capacitor 3 from the power source, the fully open controlled rectifier 2 and the primary winding 5 of the ignition coil 4 pass to the maximum voltage. When the engine starts at the time of high level on the input bus 8, the control unit 7 causes the ignition signal to the thyristor 6, when opened, which discharges the storage capacitor 3 to the primary winding 5 of the ignition coil 4, which provides the maximum energy of the spark discharge.

When the engine goes to idle speed, as well as at the initial moments of acceleration, its operation is unstable due to the appearance of misfire. In this case, in a uniform sequence of pulses, coming from the output of the ignition detector -9 to the information input of the selector 12 of maximum duration, gaps appear corresponding to the time passes of ignition of the combustible mixture in the engine combustion chamber. The voltage from the output of the frequency converter 11 is the voltage obtained by converting the frequency and 1 pulses taken from the toothed disk to the motor shaft through the sensor of the angular impulses of the engine speed sensor 10 and controls the frequency of the generated pulses of the first 13 and second voltage controlled oscillators. The counting input of the second counter 20 of the selector 12 of maximum duration from the output of the second generator 19, controlled by voltage, receives a sequence of pulses, the frequency of which varies depending on the value of engine speed and the greater the higher the value of speed. Second counter

five

0

five

20 counts the number of pulses at time points between two successive ignitions of the combustible mixture, si, i.e. when the output of the ignition detector 9 to the second input of the second element IS-NOT 22 receives a logical 1 signal, and from its output a logical O is applied to the reset input of the second counter Q 20, enabling the counter to operate. The logic signal O from the high-order output of the second counter 20 is inverted by the inverter 21 and, arriving at the first input of the second element NAND 22, allows the counts to be counted by the second counter 20. The frequency dependence of the pulses produced by the second voltage-controlled oscillator 19 depends on engine revolutions are set in such a way that, in the absence of misfires, the next logical signal O from the output of the ignition detector 9 through the second IS-NOT 22 element embraces the second with the chetchik 20 before it is calculated to or logic 1 at the output of MSB. If the next impulse from the output of the ignition indicator 9 is not in time, i.e. ignition misfire occurs, then the second counter 20 counts up to the appearance at the output older than 1 of the bit of the logical signal, which the Inverter 21 zeroed this counter. Thus, the maximum duration selector 12 generates pulses only at the moments of misfiring. If the time between two successive ignitions varies due to a change in the engine speed value, but there are no ignition gaps, then the selector 12 of max-i maximal duration is not disturbed, since the frequency of the second generator also changes with the engine speed value 19, voltage controlled. A logical 1 signal from the forward output of the selector 12 of maximum duration, corresponding to the ignition skipping, affecting the reset input of the first counter 14, sets its outputs to the logical O state, preventing the signal from the high bit output of the first counter 14 from passing through the first element AND-NOT 15 to the input of the reverse count reverse

five

0

five

0

five

counter 16, at the same time, the ignition pulse from the inverse output of the selector 12 of the maximum duration increases by one unit the contents of the reversible counter 16. If this overflows, the signal from the high-end transfer output again records from the information inputs to the reversible counter 16 maximum number, angle of conductivity

of the controlled rectifier 2 remains maximum, ensuring the continuation of the issuance of the maximum energy of the spark discharge.

I

If due to improved mode

the engine misses ignition stopped, then after a time delay determined by the frequency of the first generator 13, controlled by the voltage, and the first first-go counter of counter 14, the pulse from the output of the first discharge of the first counter 14 through the first element AND-15 reduces by one unit the contents of the reversible counter 16. At the same time, the block 17. pulse-phase control, controlled by the binary code from the output of the reversible counter 16, reduces the conduction angle of the thyristors of the controlled rectifier 2, the charging voltage of the accumulator The capacitor 3. is reduced, and therefore the energy of the spark discharge is reduced. Further operation of the engine without misfiring leads to a gradual decrease in the charging voltage of the storage capacitor 3. At the same time, the spark discharge energy gradually decreases to the minimum corresponding to the minimum charging voltage of the storage capacitor 3, which still causes a steady ignition of the combustible mixture the engine. The minimum conductivity angle of the thyristors of the controlled rectifier 2, at which the storage capacitor 3 is charged to the minimum allowable value, corresponds to the zero code at the input of the unit 17 of the pulse-phase control. In this case, the OR 18 element by its output signal of the logical O prohibits the passage of impulses from the high bit of the first counter 14 through the first AND 15 element to the countdown input of the reversing counter 16, When the mode degrades

0

five

0

five

0

five

0

five

When the ignition process deteriorates to such an extent that ignition misses, the inverse output of the selector 12 of the maximum duration receives pulses at the direct counter input of the reversible counter 16. At the same time, the number at the output of the reversible counter 16 increases, therefore the number in the digital code at the input of the unit 17 of the pulse-phase control increases, which increases the conduction angle of the thyristors of the controlled rectifier 2, thereby the charging voltage of the storage capacitor 3 is increased to such a magnitude as is necessary for engine operation without misfiring.

The block 1 7 can also be executed with a pulse-width control. In this case, the change in the magnitude of the charging voltage of the storage capacitor 3 is determined by the duration of the control pulses of the block 17,

Claims (1)

Invention Formula A device for automatic control of ignition of a combustible mixture in an internal combustion engine, containing a storage capacitor connected through the primary winding of the ignition coil and a rectifier to a voltage converter, a thyristor connected in parallel with the outputs of the rectifier, the control elec- trictor connected to the output the control unit to which the input bus is connected, the ignition indicator and the engine speed sensor, characterized in that, in order to increase the reliability of the device, the pulse-phase control unit, the maximum duration selector, the first counter, the first NAND element, the OR element, the reversible counter, the presetting unit, are rectified — made controllable, and the information inputs of the reversible counter are connected to the first output of the block the preset, the second output of which is connected to the input of the preliminary record of the reversible counter, the first input of the presetting unit is connected to the transfer output of the senior discharge of the reversible counter, The stroke of the engine speed sensor is connected to the input of the frequency converter - voltage, the output of which is connected to the control input of the maximum duration selector and through the first controlled generator with the counting input of the first counter, the output of the highest bit through which the first input of the NAND about connected to the reverse count input of a reversible counter, the bit outputs of which are connected to the inputs of the RSHI element and the inputs of the pulse-phase control unit, the outputs of which are connected to the control electrodes of the controlled rectifier thyristors, the output of the OR element is connected to the second input of the first element AND - NOT, the output of the flame detector is connected to the information input of the selector of maximum duration, the direct and inverse outputs of which 0 five 0 connected, respectively, to the input of the drive, ca of the first counter and to the input of the direct account of the reversible counter, the maximum duration selector consisting of an inverter, a second AND-NOT element, a second controlled generator and a second counter, the counting input of which is connected through the second controlled generator with the control input of the selector of maximum duration, the output of the most significant bit of the second counter is connected to direct m1 -.sh output of the selector of maximum duration, through an inverter with an inverse output of the selector of the maximum length also with the first input of the second AND-NOT element, the output of which is connected to the reset input of the second counter, and the information input of the selector of maximum duration is connected to the second input of the second AND-NO element. 27 28 Z3 and about.