SU918473A1 - Apparatus for controlling fuel injection into i.c. engine - Google Patents

Description

(54) CONTROL DEVICE FOR INJECTION FUEL IN INTERNAL COMBUSTION ENGINE

one

This invention relates to fuel injection control systems for internal combustion engines.

Control devices for injecting fuel into an internal combustion engine are known, comprising a shaft speed sensor, a shaft tooth counter, a control counter unit, and solenoid valves; the sensor is made in the form of a permanent magnet mounted on the shaft, and the first and second coils installed at the shaft, the counting unit is made with the first and second pair of input terminals connected respectively to the first and second coils, and has a third one connected to the teeth counter one

The known device has high speed, accuracy and reliability of operation and automatically adjusts the fuel injection advance angle of a multi-cylinder engine as a function of the angular velocity of its shaft. However, this device is unsuitable for controlling the fuel injection of multi-cylinder four-stroke engines, since it implements fuel injection into each cylinder in each revolution of the shaft, and in a four-stroke engine

fuel injection into the cylinder must be made once every two turns of the shaft.

The purpose of the invention is to expand the functionality of the device.

This goal is achieved by introducing the AND circuit and the trigger into device 5, the outputs of the AND circuits are connected to the solenoid valves, the counting input of the trigger is connected to the last output of the controlling counting unit, the outputs of which are connected to the first inputs of the And circuits, grouped in pairs, the second inputs of the first circuits And of the indicated pairs are connected to the direct output of the trigger, and the second inputs of the second circuits And of the indicated pairs are connected to the inverse output of the trigger.

15

The drawing shows b.yuk diagram of the device.

The device contains a sensor 1 revolutions of the shaft 2 of the engine, made in the form of a permanent magnet 3, mounted on the shaft 2, and two coils 4 and 5, installed

20 at the shaft 2, the counter 6 teeth, mounted at the gear wheel 7 mounted on the shaft of the control counting unit 8. The first and second pairs of input terminals of the control counting unit 8 are connected respectively to coils 4 and 5, and the third input clip is to counter b teeth. The first, second and third outputs of the control counting unit 8 are connected to the first inputs of circuits AND 9-14 grouped in pairs in accordance with the order of operation of the cylinders. The second inputs of the circuits II, II and 13 are connected to the direct output of the trigger 15, the second inputs of the circuits 10, 12 and 14 are connected to the inverse output of the trigger 15, the counting input of which is connected to the third output of the controlling counting unit 8. The outputs of the circuits I 9-14 are connected respectively to the solenoid valves 16-21, the number of which is equal to the number of engine cylinders. The device works as follows. When the Porsch of the first (fourth) cylinder passes through the top dead center, the permanent magnet 3 passes near the coil 4 and a voltage pulse arising due to a change in the magnetic flux penetrating it turns on the first pair of input terminals of the control counting unit 8. In the control counting block conversion of the piston movement time from the upper dead point to the lower one, reduced by the value of the task, of the advance injection time, into a binary number. At the moment of arrival of the piston of the first (fourth) cylinder to the lower dead point, the magnet 3 passes near the roller 5 and a voltage pulse arising at its terminals goes to the second pair of input terminals of the control unit 8. Starting from this moment, in the control unit 8 the process of moving the bottom from the dead point to the upper one, converts the previously obtained binary number into the time interval, at the end of which a voltage pulse is generated at the first output of the controlling counting unit 8. Duration The impulse determines the duration of the fuel injection .-, The pulse formed at the first output of the specified block arrives at the first inputs of the And 9 and 10 circuits and passes through the one of them, at the second input of which a single signal acts. Assume that trigger 15 is in a single state, then the AND 9 circuit is open, the pulse passes to the solenoid valve 16, opening it and producing fuel injection into the first cylinder. At the end of this pulse, fuel injection into the first cylinder is stopped. Information about the angle of rotation of the shaft 2 in the form of the number of pulses, corresponding to the number of teeth of the gear wheel 7 passed near the counter, comes from the counter 6 teeth to the third input terminal of the control counting unit 8. As a result of this, when the gear wheel 7 is fitted onto the shaft 2 , on the NI teeth from the moment of appearance of the pulse at the first output of the control counting unit 8, a voltage pulse appears at the second output of this unit. Since the trigger 15 remains in its former, single state, the pulse from the second output of the controlling counting unit 8 passes through the AND 11 circuit to the electromagnetic valve 18 ,. opening it and producing fuel injection into the second cylinder. When the gear wheel 7 rotates on a certain number of teeth, for example, Nj, counting from the moment of the appearance of a pulse at the second output control: its counting unit 8, a voltage pulse appears at TpeTj eM output of this block passing through the open circuit AND 13 on the solenoid valve 20. The latter opens, producing fuel injection into the third cylinder of the engine. The end of the pulse at the third output of the control counting unit 8 leads to the transition of the trigger 15 to another, zero state, as a result of which a single signal is set at the second inputs of the circuits 10, 12 and 14, and at the second inputs of the circuits 9, 11 and 13 is set zero signal. During the time from the moment the fuel is supplied to the first cylinder until the moment when it is supplied to the second cylinder, the permanent magnet 3 passes near the roller 4, which corresponds to the passage of the fourth (first) cylinder through the top dead center, and to the first pair of input terminals of the control calculator Block 8 receives a voltage pulse. During the movement of the threshold to the lower dead point in the control counting unit 8, as before, the time interval is converted into a binary number. During the passage of the piston through the bottom dead center, which occurs between the time the fuel is supplied to the second cylinder and the second cylinder is supplied, the magnet 3 passes near the coil 5, and a voltage pulse is applied to the second pair of input terminals of the control unit 8 As a result, in the process of moving the squelch from the bottom dead center to the upper one in the specified block, the previously obtained binary number is converted into a time interval, after which a voltage pulse is generated The first output of the controlling counting unit 8. This impulse arrives at the first inputs of the And 9 and 10 circuits, but at the second input of only one of them - the And 10 circuit - a single signal acts, resulting in a voltage pulse passing to the solenoid valve 18: opening it and producing fuel injection in the fourth cylinder. During the considered period of time from the moment of the transition of the trigger 15 to the zero state in the fourth cylinder

when the piston moves from the top dead center to the bottom one, the suction takes place, and in the first cylinder - the r-stroke; when the piston moves beyond the dead point to the upper one in the fourth cylinder, compression occurs, and in the first one. cylinder - exhaust.

When the gear wheel 7 rotates on a certain number of teeth, which, as before, is equal to 1, counting from the moment of appearance of a pulse at the first output of the controlling counting unit 8, a voltage pulse appears at the second output of this block, acting on the first the inputs of circuits 11 and 11. However, only the circuit 12 turns out to be open, since a single signal acts on its second input, and the voltage pulse indicated by it passes to the solenoid valve 19, opening it and producing fuel injection into the fifth cylinder. In the fifth cylinder, compression occurs at this time, and exhaust in the second cylinder.

Upon further rotation of the shaft 2 and the toothed wheel 7 mounted on the number of teeth, as before, equal to Nj: counting from the moment of appearance of the pulse at the second output of the control counting unit 8, a voltage pulse appears at the third output of the specified block. This impulse arrives at the first inputs of the circuits AND 13 and 14, but since only the AND 14 circuit appears open, a voltage pulse passes to the electromagnetic valve 21, opening it and producing fuel injection into the sixth cylinder. In the sixth cylinder at this time there is a compression, and in the third cylinder - exhaust. At the end of the pulse at the third output of the controlling counting unit 8, the trigger 15 goes into one state, a single signal from its direct output goes to the second inputs of the I9 circuits

11 and 13, and the zero signal from its inverse output goes to the second circuits.

12 and 14. With the transition of the trigger 15 to the unit state, the device is prepared to implement fuel injection into the first, second and third cylinders.

In the pause between the fuel injection into the fourth and sixth cylinders, the piston of the fourth (first) cylinder makes a full stroke from the upper dead point to the lower and part of the stroke from the lower dead point to the upper one, and the control counting counting unit 8 works as before. According to the previously adopted order of operation of the cytlinders, fuel injection into the first cylinder occurs after fuel injection in the neck cylinder, as a result of which transition of the trigger 15 into a single state occurs earlier than the formation of fuel injection into the first cylinder. At the position of the piston of the first (fourth) cylinder determined for a given angular velocity of the shaft 2 at the first output of the control calculating unit 8 A voltage pulse passing through the AND 9 circuit to the solenoid valve 16 appears, opening it and producing fuel injection into the first cylinder . Further, the operation of the device is repeated.

In the process of engine operation and turning

J of the shaft 2 with the toothed wheel 7 mounted on it at the outputs of the controlling counting unit 8, alternately one time during the rotation of the shaft, voltage pulses are generated, the first inputs of the AND 9-14 circuits.

- Which of the above schemes passes a pulse and into which of the cylinders fuel will be injected depends on the state of the trigger 15. The trigger 15 changes from one state to another once per revolution of shaft 2 at the end of the pulse at the third high control counting unit 8. This causes one trigger shaft 15 to be in a single state, a single signal goes to the second inputs of the circuits AND 9, 11, and 13, the solenoid valves 16, 18 and 23 operate, and the fuel is injected into the first, second and third cylinders alternately and in the other turn of the shaft, the trigger 15 is in the zero state, a single signal is fed to the second inputs of the circuits I, 12 and 14, the solenoid valves 17, 19 operate and

21, and fuel injection occurs alternately in the fourth, fifth, and sixth cylinders.

Claims (1)

1. USSR author's certificate in application number 2832784 / 25-06, cl. F 02 D 5/02, 1979;