SU1430572A1 - Device for controlling rotational speed of internal combustion engine shaft - Google Patents

Abstract

The invention relates to the engine-building industry and makes it possible to improve the quality of control of the frequency of rotation of the engine shaft. A shaft rotational speed sensor 1 and a pulse generator 2 are connected to a synchronization unit (B) 5, and a driver 3 addresses with three inputs is connected to memory B 4. The second output B 5 is connected to B 6 delay command triggers (T) 10 and 9 through the decisive T 8, the first output of which is connected to the third input of the solving T 7. The first output B 5 is connected to the counter 11 pulses, the outputs of which are connected to the second input B 4 and the first input T 7 and the second input B 6. The second output B 6 is connected to the second input T 7, the second output of which is connected to the second input B 5. The inputs T 9 are connected to the output T 7 and input B 4 and the outputs T 9 and 10 are connected to the inputs of the differential amplifier 12. When the counter overflows, address B 4 adds unit. As a result of this, T 8 and the counter are rewritten from the odd-numbered memory address of the division factor corresponding to the maximum allowed period — the right deadband. Since after the first overflow of the counter T 8 it turns upside down, the new state T 8 transmits the second overflow signal of the counter to T 7, setting it to the prohibiting state. 2 Il. c in cl

Description

rig.1

The invention relates to engine design, in particular to automatic control of internal combustion engines, and can be used to control the frequency of rotation of a diesel shaft.

The purpose of the invention is to improve the quality of regulation.

 - Figure 1 shows the device JQ Ia of Figure 2 - the synchronization unit.

The device contains a diesel shaft rotational speed sensor 1, interrupted in the form of a core winding and a peak detector, installed 15 above the flywheel ring gear, a generator of 2 pulses, an address generator 3 with three inputs for connecting to the diesel parameter sensors, block 4; TI with three inputs, block 5 synchronization with counting inputs and two outputs, block 6 delay with two inputs, the first decision trigger 7 with three inputs and two outputs, the second decision trigger 8 with two outputs, the first and second command triggers 9 and 10 , each of which is equipped with two inputs, a pulse counter 11 with three inputs and two outputs, a differential amplifier of 12, the outputs of which are connected to the engine 13 of the drive 14 of the rail of the fuel pump.

The output of sensor 1 is connected to the first input of block 5, the second input of which, 5 is connected to the output of generator 2, its third input is connected to the second output of trigger 7. The first output of block 5 is connected to the first input of counter 11, and the second output of block 5 It is connected with the first inputs of block 6, trigger 10 and 9, and the third input of block 4. The second input of the last is connected to the output of the address 3 of the driver, and its output is connected to the second input of the counter 11, the output of which is connected to the first input of the block 4 and the first input of the trigger 7 and the second input of the block 6,

The output of block 6 is connected to the trigger input 8, the fourth input of block 5, the third input of the counter 11 and the second trigger input 7, and the first output of the trigger 7 is connected to the second input of the trigger 9. The first output of the trigger 8 is connected to the second input of the trigger 10, and the second The trigger input 8 is connected to the third input of the trigger 7. The outputs of the triggers 9 and 10 are connected to the inputs of the differential terminal 12.

The synchronization unit 5 is executed in the form of the RS flip-flop 15 and the first and second elements AND-NOT 16 and 17, equipped with three inputs. The first inputs of the elements AND-NOT 16 and 17 are combined with the second input of block 5, the first input of which is combined with the input of the S-flip-flop 15. The second inputs of the elements 16 and 17 are connected to the inverse output of the trigger. The third input of block 5 is combined with the third of the second element 17 and the fourth input of block 5 is with the third input of the first element 16. The first and second outputs of block 5 are combined with the outputs of elements 17 and 16, respectively. ,

The device works as follows.

Setting the required speed diesel mode is performed by setting the appropriate reference frequency fccg of generator 2. At the same time, the crankshaft rotation frequency is adjusted to other diesel parameters, for example, incoming air temperature t ,, charge air pressure P, system fluid temperature cooling is carried out automatically using the shaper 3 addresses to the memory block 4.

Pulses with a period of following T from the sensor 1 are fed to the first input of the synchronization unit 5. A pulse from sensor 1 sets the inverted output of trigger 15 of synchronization unit 5 to the state O and blocks the pulse train arriving at the second input of unit 5 from the frequency generator 2.

On the first and second input block

5po signals are. In this case, the counter 11 is set to O and is prepared for the start of the account. The signal from the first output of block 5 through the block

6 delays are fed to the installation input of the counter 11 and the second decisive trigger 8. At the same time, the division factor N0 is copied from memory block 4 and corresponds to the smallest allowed rotation period T1 at a given speed mode and the state of the diesel parameters and the counter 11 is started. . The decisive trigger 8 is set

state 1, and decisive trigger

7- O. In this case, the information is rewritten from the decisive

Triggers 8 and 7 on command triggers 10 and 9, respectively.

If counter 11 overflows, one is added to the address of memory block 4. The overflow signal of the counter i1 through the delay block 6 resets the decisive trigger 8 to O and, from the memory address 11, the division factor N1 corresponding to the maximum allowed period T2, the right deadband, is copied to counter 11.

Since after the first counter overflow; 11 trigger 8 turn

In state O (tilting), the normal state of this trigger passes the second overflow signal of counter 11 to trigger 7, setting it to state 1 and prohibiting further counting.

Let us consider three particular cases of the device operating at any chosen rotational speed. This deadband & T T2-T1. Suppose that the rotational speed of the crankshaft is set, i.e. the period of following the pulses of the cycle T T T1. In this case, the output of the counter 11 does not receive signals about its overflow and solving the triggers 8 and 7 retain their initial states 1 and O, which are transmitted to the command triggers 10 and 9. At the same time, the output of the trigger 10 is a logical 1 signal, and the output of the trigger 9 is a logical signal O, which causes a command on the engine 1-3, corresponding to the reduction of the fuel cycle.

If the rotational speed of the crankshaft corresponds to the period T T that is inside the dead band, i.e. then, until the next pulse from the frequency sensor arrives, the decisive trigger 8 is set to the state O by the first counter overflow signal and the command triggers 10 and 9 are zero, causing the actuator 13 and the actuator 14 to stop, which corresponds to a constant supply of fuel finding the frequency of rotation within the dead zone.

The magnitudes of the T2-T1 deadband for various diesel speeds are specified as N1 codes.

and are stored at odd addresses of memory block 4 in pairs with NG codes, -adminable monitored frequencies of the enemy A1 and stored 1 at even-numbered addresses.

In the case when the crankshaft rotation frequency decreases so much that the period T Tr, becomes less than T2, the first overflow signal of the counter 11 sets the critical trigger 8 to the state O, and the second overflow signal sets the critical trigger 7 to the state 1, after which sensor pulse hour

rotational notes overwrites the states of the decisive triggers 8 and 7 on the command triggers 14 and 15. In this case, the output of the trigger 10 is a logical signal O, and the output of the trigger 9 is a logical 1 signal, causing the engine 13 and the drive 14 of the top drive to direction of increase in fuel supply.

Claims (1)

Invention Formula 0 A device for adjusting the rotational speed of the internal combustion engine shaft, comprising a rotational speed sensor, the output of which is connected to the input of the delay unit, a pulse generator, a pulse counter with two inputs, a memory unit, the first decisive and first synchronous triggers each each of which is provided with two inputs, the second input of the pulse counter is connected to the output of the memory unit, and the output of the counter is connected to the input of the memory unit and 0 by the first input of the first decision trigger, the second input of which is connected to the output of the delay unit, and the output of the first decision trigger is connected to the second input of the first command trigger, characterized in that, in order to increase the quality of regulation, the device additionally contains a second decision trigger with two outputs and one input and a second command trigger with two inputs and one output, a differential amplifier, a synchronization unit, made with four inputs and two outputs, and an address driver, equipped with odes by the number of engine parameter sensors, a memory unit is provided with second and third inputs, the third input of the pulse counter, delay unit - a second input, and the first 0 five The second trigger and the third input, the first input of the synchronization unit is connected to the output of the speed sensor, its second input is connected to the output of the pulse generator, its third input is connected to the second output of the first thermal trigger, the first synchronization output is connected to the first input of the pulse counter, the output of which is connected to the second input of the delay unit, the second output of the synchronization unit is connected to the third input of the memory unit and the first inputs of the first + 5c. R R D C 15 YES / 0X0 9  ffifO 0 five and the second command triggers, the outputs of the latter are connected to the inputs of the differential amplifier, the output of the address generator is connected to the second input of the memory unit, the output of the delay unit is additionally connected to the fourth input of the synchronization unit, the third input of the pulse counter and the second decisive trigger input, the first output of which connected to the second input of the second command trigger, and the second input of the second decision trigger is connected to the third input of the first trigger. Nd bxoff W 2nd you) (od G7 1st BfixoS