SU1343274A2 - Device for measuring fuel injection advance angle in diesel engine - Google Patents

Abstract

The invention makes it possible to increase the measurement accuracy and expand the functionality of the device. The device contains a fixed point sensor 1, drivers 2, 3, 27, sensor 4 of the process under investigation, triggers 5, 6, 17, 28, 29, elements I 7, 8, 9, 32, multiplexers 10, 11, 31, counters 12.13, 14, 15, 33, ready trigger 16, registers 18, 19, 30, indicator 20, bus drivers 21, 22, 34, g generator of 23 pulses, data bus 24, control bus 25, calculation unit 26. The device has a channel for measuring the shaft turning time at the angle of the feed duration. The measurement of the shaft turning time is synchronized with the measurement of the shaft turning time by the advance feed angle. Due to this, the measurement of both parameters occurs in one cycle, and therefore the error associated with the instability of the beginning of the supply and the instability of the angular velocity of rotation from cycle to cycle is completely eliminated. The device is able to simultaneously measure the advance angle of the top brew and the angle the duration of the fuel supply. 2 Il. 1C ate N) FIG. 1

Description

The invention relates to the means of diagnostics and control of internal combustion engines and is the solution of the device according to the author. St. N 1239391.

The circuit of the invention is an increase in the accuracy of measurement and the expansion of the functional capabilities of the device.

block 26 of the calculation, and inverse - to the third inputs of the first, second and third parts of its elements And 7-9, respectively. Sensor 4 of the process under study, through the second driver of the 3 pulses, is connected to the unit input of the third and the synchronizing input of the first trigger 17 and 5, respectively, of Fig. 1 is represented functionally. Pr my exit first trig

on the device diagram; figure 2 - timing diagram of the device.

The diagram shows: a - signals at the output of the first shaper b - signals at the output of the second shaper, c - signals at the output of the third shaper, g - signals at the input of the first counter, d - signals at the input of the second counter, e - signals at the fifth input counter, f - signals Ready, s - signals at the input of the third counter, and - signal Request.

The device contains a fixed point sensor 1, the first driver 2, the second driver 3, the sensor 4 of the process under investigation, the first trigger 5, the second trigger 6, the first element H 7, the second element And 8, the third element And 9, the first multiplexer 10, the second multiplexer 11 , first 12, second 13, third 14, fourth 15 counters, readiness trigger 16, third trigger 17, first 18 and second 19 registers, indicator 20, first 21 and second 22 bus drivers, pulse generator 23, data bus 24, bus 25 controls, block 26 B1) 1, third driver 27, even erty 28 and fifth 29 triggers the third register 30, the third myl.tiplekcop 31, fourth member 32 H, fifth counter 33, a third bus driver 34.

The sensor 1 is a fixed point of connection- 2 with the bus 24 of the data of the calculation block 26. The output of the second counter 13 is connected via the second bus driver 22 to the data bus 24 of the calculation unit 26. Circuit Bus request 25 QU 5 of the computing unit 26 is connected to the zero inputs of the first, second and third triggers 5,6,17, respectively, the readiness trigger 16 and the first, second and third counters 5,13,14, respectively. The control circuits of the first and second bus formers 21 and 22 are connected to the corresponding outputs of the control bus 25 of the calculating unit 26. Tire

Dinen through the first driver 2 pulses with the second input of the third element I 9 and the synchronizing input of the second trigger 6. The direct output of the second trigger is connected to the first inputs of the first and third elements H 7 and 9, respectively, and to the information input of the first trigger 5. Output of the third element And 9 is connected to the counting input of the third counter 14, the overflow output of which is connected to the single input of the ready trigger 16, which is connected to the control bus 23

block 26 of the calculation, and inverse - to the third inputs of the first, second and third parts of its elements And 7-9, respectively. The sensor 4 of the process under study through the second driver 3 pulses connected to the single input of the third and the clock input of the first trigger 17 and 5, respectively

Hera 5 is connected to the first input of the second element I 8. The direct output of the third trigger 17 is connected to the information input of the second trigger

6. The output of the first element I 7 is connected to the counting input of the first counter 12. The output of the second element I 8 is connected to the counting input of the second counter 13. The first input of the indicator 20 is connected to the data bus 24 of the calculation unit 26, and the second to the control bus 25 of the block 26 computations. The data bus 24 of the computing unit is connected to the first inputs of the first and second registers 18 and 19, respectively, and the control bus 23 of the calculation unit 26 is connected to the second inputs of the first and second registers 18 and 19, respectively. The output of the first register 18 is connected to the address input of the first multiplexer 10, the output of which is connected to the second input of the first element And 7. The output of the second register 19 is connected to the address input of the second multiplexer 1 1, the output of which is connected to the second input of the second element And 8. Pulse generator 23 connected to the counting input of the fourth counter 15, the outputs of the bits of which

connected to the corresponding information inputs of the first and second multiplexers 10 and 11, respectively,. The output of the first counter 12 is connected via the first bus driver

313432

24 of the computation unit 26 is connected to the information input of the third counter 14 and the first input of the third register 30. The control unit 26 of the computation unit 26 is connected to the synchronization input of the third counter and the second input of the third register 30. The output of the first driver 2 is connected to the first zero input the first trigger 5. The forward output of the second trigger 6 is connected to the information input of the fifth trigger 29. The forward output of the trigger 16 is ready to connect 20

25

This signal and the unit level signal from its direct output are fed to the information input of the second trigger 6. When the piston is at the top dead center (TDC), the fixed point sensor 1 produces an electrical signal. Shaper 2 generates this signal in amplitude and duration. The generated signal is fed to the clock input of the second trigger 6, which is set to one. A single level signal from its forward

whose information input is the fourth to the 15th unit state. The third trigger trigger 28. The output of the second for- mation 17 is set to a unit of 3 pulses connected to the clock input of the fifth trigger 29. The output of the sensor 4 of the process under investigation is through the third driver

27 pulses are connected to the synchronization input of the fourth trigger 28 and the zero reset input of the fifth trigger 29. Forward output of the fourth trigger

28 is connected to the control bus 25 of the calculating unit 26, and inverse to the first input of the fourth element

And 32. The direct output of the second trigger 29 is connected to the second input of the fourth element And 32. The third output of the register goes to the first inputs of the first 30 connected to the address input of the first and third elements And 7.9 and

information inputs of the first and fifth triggers 5.29, respectively. Since at the inverse output of the ready availability trigger 16 there is a single potential, the pulses from the generator 23 through the counter 15, the multiplexer 10 and the And 7 element begin to flow to the counting input of the first counter 12. At the same time, in the counter 12 the operand starts to form the N-digital equivalent of the known reference rotation angle engine shaft (for example, two full revolutions of the shaft). After the second trigger 6 is set up by the impulse from the imaging unit 2 in a single state, the same impulse goes through the third element I 9 to the counting input of the counter 14. With further rotation of the shaft, the input inputs of the third multiplex 50 - ra 31.thrider 27 produces a single

When the engine is running, sensor 1, a fick pulse, which arrives at the synchronized point, generates electrifying inputs of the fourth and fifth signal about the presence of the trigger piston 28 and 29, respectively, and the engine at top dead center, gg confirms their zero state, and Sensor 4 of the process being studied is generated. Upon further rotation of the shaft, an electrical signal is dated, the corresponding 4 of the process under study generates the start of fuel injection. Vaet electrical signal. The second one is time shapers 2,3,27 normalizer 3 selects from this

the third multiplexer 31, the output of which is connected to the third input of the fourth element I 32, the output of which is connected to the counting input of the fifth counter 33, the information output of which is connected via the third bus driver 34 to the data bus 24 of the calculation unit 26. Circuit Bus request 25 control block 26 of the calculation is connected to the zero inputs of the fourth trigger 28 and fifth counter 33.

The control circuit of the third bus driver 34 is connected to the corresponding bus output 25 of the control unit 26 of the calculation, and the bits of the fourth counter 15 are connected to the corresponding information

40

Signals from sensors 1 and 4 are amplitude and front.

From the received fuel injection signal, shaper 3 extracts a single pulse corresponding to the start of injection, and shaper 27 - at the end of injection. From the output of the imaging unit 3, the signal arrives at the single input of the third trigger 17 and to the sync input of the first trigger 5. Since the forward output of the second trigger 6 has a zero potential, the first trigger 5 is not set to

This signal and the unit level signal from its direct output are fed to the information input of the second trigger 6. When the piston is at the top dead center (TDC), the fixed point sensor 1 produces an electrical signal. Shaper 2 generates this signal in amplitude and duration. The generated signal is fed to the clock input of the second trigger 6, which is set to one. A single level signal from its forward

single state. The third trigger 17 is set to the unit

output goes to the first inputs of the first and third elements And 7.9 and

45 50

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45 50

40

signal a single pulse corresponding to the start of the injection. This pulse sets the first and fifth triggers 5.29 to one state. As a result, the unit level signal from the direct output of the first trigger 5 is fed to the first input of the second element 8, the second element 8 opens and the pulses from the generator 23 pulses through the counter 15, the multiplexer 11 and the second element 8 begin to arrive at the counting input of the second counter 13. At the same time, in the latter, the operand begins to form the digital equivalent of the shaft turning time by the angle of fuel advance. The fourth element 32 also opens and the pulses from the generator 23 pulses through the counter 15, the multiplexer 31 and the quarter element 3 begin to arrive at the counting input of the fifth counter 33. In the latter, the operand Ny is the digital equivalent of the shaft turning time fuel supply. When the shaft rotates further, the sensor 1 of a fixed point is triggered.

Shaper 2 generates a single impulse, which flows through the third element AND 9 to the counting input of the third counter 14 and zeroes the first trigger 5. At the same time, the second element AND 8 closes and the pulses from the heater 5 23 counters 12,13,33,

The controller 23 to the counting input of the second counter 13 is not received. When the shaft is rotated further, the fuel supply ends. The former 27 generates a single pulse, which sets the trigger 29 to the zero state. As a result, the fourth element AND 32 is closed and no pulses are received from the generator 23 to the counting input of the fifth counter 33. Upon further rotation of the shaft, the operation of the device is repeated until a pulse from the first pulse arrives at the counting input of the third counter 14.

The calculating unit 26 is definitive for each of the counts 13, 33 how many binary numbers are zero before the first

40 yes having a single value than the counting of the binary grid itself is 13.33, otherwise, how many times it is necessary to increase

45 filling pulses with the generator 12,13,33, so that it would be completely filled (without re) In order for the senior bit of 12,13,33 to have a single

shaper 2, as a result of which 50, it is necessary to increase the frequency of the third counter 14 overflows. full pulse generator 23

-, t4

In this case, a single pulse from the overflow output of the third counter 14 will set the ready trigger 16 to a single state. In this case, the zero-level signal from its inverse output blocks the further arrival of pulses at the counting outputs of the first, second and third counters 12-14.

A single-level signal from the direct output of the ready trigger 16 arrives at the informational input of the fourth trigger 28. With a further rotation of the shaft, the fuel injection ends and a single pulse from the output of the former 27 sets the fourth trigger 28 to one. In this case, the fourth element AND 32 will block further receipt of pulses at the counting input of the fifth counter 33. The signal of the unit level from the direct output of the fourth trigger 28 will go to the bus 25 of the calculator 26, indicating the end of formation

operands N, N .., N

Zo

Depending

from the M code recorded at the beginning of the measurement to the information input of the third

counter 14, these values are either single values or values averaged over several cycles. Calculation block 26 performs sequential sampling

operands from counters 12, 13, 33 through the corresponding bus drivers 21, 22, 34 to the bus 24 of data on the corresponding control signals from the control unit 25 from the calculation unit 26. Upon completion of the sampling of operands N,, N,, Ny into the internal memory, the computing unit 26 proceeds to the final determination of the frequency of the generator 23 of the counters 12,13,33 filled with pulses

The calculating unit 26 determines separately for each of the counters 12, 13, 33 how many binary bits have zero values until the first bit has a single value, and the counting is performed from the most significant bit of the binary grid of counters 12, 13.33, otherwise, it is determined how many times it is necessary to increase the frequency

filling the generator with pulses 23 counters 12,13,33 so that they are completely filled (without overflow). In order for the highest bit in the counters 12,13,33 to have a single value, it is necessary to increase the frequency of filling the generator with pulses 23

-, t4

times for dl 12 K ,, 2 13 Kjj 2 times for dl

l counter chick

 J

33 Kjj 2 times, where m is the number of most significant bits having zero

values up to the first of the most significant ones having a single value in counter 12 for the operand N, m is the number of most significant bits having zero

the value to the first of the most significant ones having a single value in the counter 13 for the operand N, the number of the most significant bits having zero values to the first of the most significant bits that have a single value in the counter 33 for the operand N.

The calculating unit 26 increases the frequency of the pulse filling pulses 12,13,33 by a specified number of times by sending through registers 18,19, 30 to the address inputs of the multiplexers 10,11,31 corresponding addresses through which those outputs of counter bits 15 from which an optimal filling of the counters with pulses of the generator 23 occurs, when their highest bits have a single value without overflow.

Then, the calculating unit 26 determines, at the end of the preliminary scaling cycle, the scaling factors for the injection advance angle

2 (Mj +.), - f-tnj 4-rr ,, r)

2, D)

TO

(one)

feed angle

-.nj g ,,)

TO

2 -2

I + 1)

 2

Then, the calculating unit 26 generates a Request signal, according to which the device is reset, and writes the code M to the third counter 14. The device is ready to determine the desired injection advance angles and feed duration Y, taking into account the scaling factors using the formulas

Wow to - 720 °, (3)

G. K

N

720

In the next cycle of operation, the device finally determines the operands N N, Ny, taking into account their equivalent determination accuracy in counters 12, 13, 33, respectively. The operation of the elements of the device is similar to the described scaling cycle with the only difference that the filling of pulses from the generator 23 of the counters 12,13,33 takes place modified, more precisely, from the point of view of their filling at a given rotation frequency

but

ten

15

20

no engine shaft. At the end of the operating cycle, the computing unit 26 sequentially samples the N, Cd, and Ny operands from the counters 12, 13, 33 through the corresponding bus drivers 21, 22, 34 to the data bus 24 using the appropriate control signals received from the control bus 25. At the end of the sampling of the operands N, NJ, NJ into the internal memory, the calculating unit 26 proceeds to the calculation of the sought angles I, and Yy according to the formulas (3), (4) with regard to (1), (2). The results of the calculations are transmitted to the indicator 20 from the bus 24 by the corresponding signal from the control bus 25, Next, the operation of the device is repeated. The channel for measuring the shaft turning time by the feed duration angle is additionally entered into the device. Moreover, the measurement of the shaft turning time at the angle of the feed duration is synchronized with the measurement of the shaft turning time through the angle ahead of the feed. Due to this, the measurement of both parameters (feed advance angle and feed time) occurs during one cycle. therefore, the error associated with the instability of the moment of the beginning of the supply and the instability of the angular velocity of rotation from cycle to cycle is completely eliminated.

The device has wider functionality because it is capable of simultaneously measuring the fuel advance angle and fuel delivery angle.

thirty

35

40

Claims (1)

Invention Formula 45 50 A device for measuring the angle of fuel advance to a diesel engine by bus. No. 1239391, characterized in that, in order to increase the accuracy and enhance the functionality, the device further comprises a third pulse shaper, fourth and fifth triggers, a third register, a third multiplexer, a fourth AND element, a fifth counter and a third bus former the data bus of the computation unit is connected to the information input of the third counter and the first input of the third register, the control bus of the computation unit is connected y13 to the synchronization input of the third counter and the second input of the third register, the output of the first pulse shaper is connected to the zeroing input of the first trigger, the direct output of the second flip-flop is connected to the information input of the fifth trigger, the direct output of the ready trigger is connected to the information input of the fourth trigger, the output of the second shaper the pulses are connected to the clock input of the fifth trigger, the sensor output of the process under study is connected to the clock input through the third pulse shaper the fourth trigger and the zeroing input of the fifth trigger, the forward output of the fourth trigger is connected to the control bus of the calculator, and the inverse is connected to the first input of the fourth And element, the forward output 7410 the step :) trigger is connected to the second input of the fourth element And, the third register output is connected to the address input of the third multiplexer, the output of which is connected to the third input of the fourth element And, the output of which is connected to the counting input of the fifth counter, the information output of which is connected via the third bus driver to the data bus of the computing unit; circuit; Request of the control bus of the computing unit is connected to the zero inputs of the fourth trigger and the fifth counter; control circuit of the third bus driver with dinena to the corresponding output control calculating unit bus, and outputs bit rows of the fourth counter are connected to respective data inputs of the third multiplexer. FIG. 2 Editor S. Patuimva Compiled by V. Gorbunov Tehred M. Didyk Proof-reader S. Cherni Order 4801 / А2Тираж 776 Subscription VNIIPI State Committee of the USSR by de. there inventions and discoveries 1G3035, Moscow, FH, Raushsk nab., 4/5 Producing enterprises ngo-printing enterprise, Uzhgorod, st. Project, 4