SU1280177A2 - Device for measuring internal combustion engine fuel injection advance angle - Google Patents

Abstract

The invention relates to the field of engine building, in particular to internal combustion engines, is an improvement of the invention of the authors. St. No. 12П440 and allows you to expand functional conglomerates and improve measurement accuracy in f

Description

an account of the simultaneous determination of both the fuel advance angle and the rotational speed of the engine crankshaft. When the engine shaft rotates, the top dead center sensor 1 (TDC) generates a pulse behind the shaft support, the injection sensor 5 a pulse from the moment the fuel injection starts, and the sensor 13 is elementary in angular movements a pulse through a known elementary angle. The pulse transducer from sensors 1, 5, 13 forms pulse bursts (operands) of N, N, N, N, and the individual circuit elements are digital equivalents of the corresponding angles of rotation of the engine crankshaft. Upon completion of the formation of these operands, the computation unit 27 performs a sequence of sampling them from the counters 9, 10, 24, 25, 26 through the corresponding bus drivers 29, ... 295 to the data bus 30. Angle

ahead of fuel injection H is determined in block 27 of calculation by f-le f G, + 4, j + H, where H, H and 4 are the angles of rotation of the engine shaft, respectively, from the start of injection to the first pulse from sensor 13, from the first pulse with sensor 3 to the last pulse from the same sensor and from the last pulse from sensor 13 to the pulse from sensor 1 TDC. The pulse from the sensor 1 TDC signal converted into an additional part of the circuit (elements 32 ... 3 &-) ensures the formation of the operand Ng in the seventh counter 37 - a digital equivalent of two full crankshaft rotations, and the calculator 27 determines the rotation speed of the shaft and advanced fuel injection angle. After the calculation is completed, the results are displayed on the indicator 28, and the elements of the device are reset. 3 il.

The invention relates to: an engine structure, in particular, to means of diagnostics of engines with fuel injection, mainly diesel engines, and is an improvement of the known device according to ed. St. No. 1211440. The purpose of the invention is to expand the functional capabilities and increase the measurement accuracy by additionally measuring the rotational speed of the engine crankshaft. FIG. 1 shows a functional diagram of the device; Fig. 2 shows a timing diagram of the elements of the device and the process of calculating the fuel injection advance angle; Fig. 3 is a timing diagram of the operation of the elements of the device and the process of determining the rotational speed of the crankshaft. In FIG. 2, the following notation is accepted: a — operation of the pulse generator 7; b - signals from the output of the imager 14; in - signals from the output of the imager 4; g - signals from the output of imager 2; d - si ° gnaly at the input of the counter 9; e - signals at the input of counter 26; W - signals at the input of the counter 10; h - signals from the output element And 16; and - signals at the input of the counter 24; K - signals from the output of the element And 17; l - signals at the input of the counter 25; m - signals from the output element And 23 Readiness; n - request signal; about - the angle of rotation of the crankshaft. In FIG. 3, the following symbols are accepted: a — signals at the output of the first driver 2; b - signals at the output of the second shaper 4; c - signal request; g - the process of calculating the fuel injection advance angle; d - signal Ready; with signal request-2; W - generator output 7 pulses; h - signals at the input of the counter 37; and - signals at the input of the counter 33; к - Ready-2 signal Устройство The device contains TDC sensor 1, first driver 2, first trigger 3, second driver 4, injection sensor 5, first element 6, pulse generator 7, second element 8, first counter 9, second counter 10 , second trigger 11, third trigger

31

12, the sensor 13 elementary angular displacements (ECU), the third form. 14, the fourth trigger 15, the third element And 16, the fourth element And 17, the fifth trigger 18, the sixth trigger 19, the fifth element And 20, the sixth element And 17 , fifth trigger 18, sixth trigger 19, fifth element And 20, sixth element And 21, seventh element And 22, eighth element And 23, third counter 24, fourth counter 25, fifth counter 26, block 27 calculating indicator 28, bus drivers 29 ... 29, data bus 30, control bus 31, ninth element AND 32, sixth counter 33, seventh trigger 34, eighth trigger 35, dess the third element And 36, the seventh counter 37, additional bus driver 38.

The top dead center sensor 1 (TDC) is connected via the first driver 2 to the second input of the first trigger 3 and the synchronizing input of the second trigger 11. The injection sensor 5 is connected through the second driver 4 to the first inputs of the first trigger 3 and the third trigger 12. Forward output of the first trigger 3 is connected to the second inputs of the first element And 6 and the second element And 8 and with the information input of the fourth tritriger. The pulse generator 7 is connected to the first inputs of the first element And 6, the fifth element And 20, the neck of that element And 21 and the seventh element And 22. The output of the first element And 6 is connected to the counting input of the first counter 9. The first input of the indicator 28 is connected to the bus 30 data of the calculating unit 27, the second input of the indicator 28 is connected to the control bus 31 of the calculating unit 27 “The output of the second element AND 8 is connected to the counting input of the second counter 10. The sensor 13 of the ECA is connected through the third driver 14 to the first inputs of the second element And 8, the third element AND 16 thu of the right element I 17 and with the sync. lowering inputs of the fourth trigger 15, the fifth trigger 18 and the sixth trigger 19. The inverse output of the fourth trigger 15 is connected to the third input of the first element 6. The output of the first counter 9 is connected via a bus driver 29 to the bus 30 data of calculation unit 27. Direct output of the third trigger 12 is connected to the information input of the sixth trigger 77 4

Hera 19 and the information input of the second trigger 11, and the inverse output with the second input of the third element And 16. The output of the third element And 16 is connected to the zero input of the third counter 2A, the Direct output of the second trigger 11 is connected to the third, input of the seventh element And 22, the second the input of the eighth element And 23 and the information input of the fifth trigger 18. The forward output of the fifth trigger 18 is connected to the first input of the eighth element And 23, and the inverse output with the second inputs of the sixth element And 21 and the seventh element And 22. The inverse output of the second trigger eleven connected to the third input of the BToporq - element AND 8 and the second input of the fourth element And 17. The output of the second counter 10 is connected via the bus driver 29 to the data bus 30 of the calculation unit 27. The inverse output of the sixth trigger 19 is connected to the second input of the fifth element I 20, the output of which is connected to the counting input of the third counter 24. The output of the third counter 24 is connected via a bus driver 29g to the data bus 30 of the calculation unit 27. The output of the sixth element And 21 is connected to the counting input of the fourth counter 25, the output of which is connected via a bus driver 29 to the data bus 30 of the calculation unit 27. The output of the seventh element AND 22 is connected to the counting input of the fifth counter 26, the output of which is connected via the bus driver 29 to the data bus 30 of the calculation unit 27. The output of the eighth element AND 23 is connected to the bus 31 of the control unit 27 of the calculation. Circuit The bus request 31 control is connected to the inputs of the installation of the first, second, third, fourth, fifth, and sixth triggers of the 3, 11, 12, 15, 18, 19, respectively, and first, second, third, fourth, and fifth counters 9, 10, 24, 25, 26 respectively. The control circuits of the bus formers 29, ... 29 are connected to the corresponding outputs of the bus 31 of the control unit 27 of the computation. The output of the pulse generator is connected to the first input of the tenth element I 36. The direct output of the second trigger 11 is connected to the synchronizing input of the eighth trigger 35, whose information input is connected to a single potential. The output of the first shaper 2

connected to the first input of the ninth element AND 32, the output of which is connected to the counting input of the sixth counter 33, the overflow output of which is connected to the single input of the seventh trigger 34, the direct output of the latter is connected to the control bus 31 of the calculating unit 27, and the inverse to the third input the tenth element of And 36. The output of the tenth element of And 36 is connected to the counting input of the seventh counter 37, whose information output is connected via the additional bus driver driver 38 to the data bus 30 of the calculation block 27. The direct output of the eighth trigger 35 is connected to the second inputs of the ninth and tenth elements AND 32, 36, respectively. The Request-2 circuit of the bus 31 of the control unit 27 of the calculation is connected to the zero inputs of the sixth and seventh counters 33, 37, respectively, and the zero inputs of the seventh and eighth triggers 34, 35, respectively. The control circuit of the additional bus driver 38 is connected to the bus 31 of the control unit 27 of the calculation

The purpose of the elements of the device is as follows. The TDC sensor 1 generates: an electrical signal that the engine piston is in the top dead center. The sensor 5 of the injection generates an electrical signal at the time of the beginning of the fuel supply. The ECG sensor 13 generates an electrical signal through a known elementary angular displacement of the engine crankshaft. Formers 2, 4, 14 normalize the signal; from sensors 1, 5, 13 in amplitude and fronts, respectively. The triggers 3, 11, 12, 15, 18, 19, 34, 35 are used to set the time intervals filled with pulses from the generator 7 of stable frequency pulses, as well as the pulse w from the ECG sensor 13. The first element, And 6, is used to form a bundle of N pulses — a digital equivalent of the angle пов of rotation of the motor shaft. The second element, And 8, is used to form a bundle of N pulses — a digital equivalent of the Chu angle of rotation of the motor shaft. Fifth element I 20 serves to form a bundle of N pulses of a digital equivalent of the angle H of rotation

motor shaft company. The sixth element And 2 serves to form a bundle of N pulses - the digital equivalent of the angle If the rotation of the motor shaft. The seventh element And 22 serves for foreg-shrove and a pack of N pulses - a digital equivalent of the angle пов of rotation of the motor shaft. The tenth element AND 36 serves to form a bundle N j. Pulses - digital equivalent of two full revolutions of the engine shaft. Counters 9, 10, 24, 25, 26. 37 serve to form and buffer operands N, N, N, N, N, N, Ng, respectively. The third and fourth elements And 16, 17 serve to generate the zeroing signals of the third and fourth counters 24, 25, respectively. The eighth element AND 23 serves to generate the Ready readiness, which is a sign of the completion of the formation of the advance injection angle operands and the beginning of the process of calculating the desired angle in the calculation block 27 according to the formula

(n- N, - N, / N).

The ninth element AND 32 and the sixth counter 33 serve to form an interval whose duration is equal to the crankshaft rotation time two turns. The seventh trigger 34 also serves to generate the Ready-2 signal, which is a sign of the end of the formation of the operand N and the beginning of the process of calculating the rotational speed of the crankshaft (c) in the calculation block 27 according to the formula:

4P

and)

where t, is the duration of the period of the pulse generator. Bus drivers 29, .., 295, 38 serve for buffering data from external devices (counter / s) when running on a common bidirectional data pin 30. The control bus 31 is bidirectional and serves for communication of the signal: control unit of the calculating unit 27 with external devices. The indicator 28 serves to display the result of calculating the determined angle H and the rotation speed LL).

The device works as follows.

In the initial state, the device is zeroed out or according to a hard program, when the calculator 27 generates 712

The signals of Request 2 and Request by external signal Reset, All counters and triggers of the device come to the initial (zero) state. When the engine shaft rotates, the TDC sensor generates electrical pulses at the moments when the piston is in the TMV one per full shaft rotation. The injection sensor 5 generates electrical pulses at the time the fuel is supplied (injected) to the engine cylinder (for example, one per two full shaft turns for a four-stroke engine). The sensor 13 elementary angular displacements generates electrical pulses through a known angle of rotation 1 of the motor shaft. The signal from the injection sensor 5 at the time the fuel starts to be delivered to the cylinder enters the first inputs of the first and third triggers 3, 12 (FIG. 2) in the cylinder 4, which are set to one. The signal of the unit level from the direct output of the first trigger 3 enters the information input of the fourth trigger 15 and unlocks the first element I 6 at the second input. Since the fourth trigger 15 in the initial state was reset, the third potential of the first element I 6 enters the inverse output of the fourth trigger 15, P1 pulses from the generator 7 pulses arrive at the first input of the first element I 6 and from the output of the last to the counting input of the first counter 9 until the sensor 13 of the ECT is triggered and the output forms The rotator 14 doesn’t see a signal that the quarter trigger 15 does not establish in one state. The zero potential signal from the inverted output of the trigger 15 blocks the flow of pulses to the counting input of the first counter 9 through the first element 6, Thus, at the output of the element 6, a burst of pulses N is formed, the digital equivalent of turning the motor shaft through an angle H (FIG. 2 d, o ),

and counting their number is carried out by the first counter 9,

Since the sixth trigger 19 was reset to zero in the initial state, then from its inverse output the resolving unit potential comes to the second input of the fifth element And 20. The pulses from the generator 7 are constantly fed to the first input of the fifth element.

778

And 20 and further to the counting input of the third counter 24, At the time of the sensor 13 ECU actuation, through the angle of rotation of the motor shaft 1, the signal from the sensor 13 output of the ECA through the driver 14 enters the first input of the third element 16, the second input of which is in the initial state there is a single potential from the inverse output of the third trigger 12. Thus, each time the EC sensor 13 is triggered from the output of the third element 16, the reset signal of the third counter 24 is sent (FIG. 2 h) until the signal about nach le injection. In this case, the injection sensor 5 is triggered and the signal from the black goes further through the shaper 4 to the first inputs of the first and third flip-flops 3, 12, which are set to one state, From the inverse output of the third trigger 12 to the second input of the third element I 16, the potential is blocked further resetting the third counter 24 by the next pulse from the 13 E5T1 sensor. Thus, a third packet N arrives at the counting input of the third counter 2D, the pulses are the digital equivalent of turning the motor shaft through the angle -Р (Fig, 2, and o). Since the reset of the counter 24 is blocked, the output of the operand code N is set at its output, which is used to calculate the sought angle V. After the first trigger 3 triggers from the direct output of the last, the unit potential unlocks the second element And 8 and the pulses from sensor I3 through driver 14 arrive at the first input of the second element And 8, Since the second trigger 11 is zeroed in the initial state, from its inverse output enters a single potential at the third input of the second element And 8, at the output of which a bundle and pulses Nj is the digital equivalent of crankshaft rotation by angle ((FIG. 2), and when the TDC sensor 1 is triggered, the second trigger 1I is set to one in its synchronous input by a signal from the output of the driver 2, and zero potential from its inverse output blocks along the third input of the second element And 8 receipt at the counting input of the second counter 10 pulses from the output of the third shaper 14,

The formation of the operand N is as follows. After triggering the TDC sensor 1 and setting the second trigger 11 into a single state from the direct output of the latter to the second input of the eighth element AND 23, the third input of the seventh element And 22, the information input of the fifth trigger 18 and the synchronizing input of the eighth trigger 35 receives a single potential . Since the inverted output of the fifth trigger 18 in the initial state enters the second input of the seventh element And 22 is a single potential, then the pulses from the generator output, 7 pulses arrive through the seventh element And 22 to the counting input of the fifth counter 26, When entering from The ECG sensor 13 through the shaper 14 and the pulse of the next after TDC sensor 1 triggered by the synchronous input, the fifth trigger 18 is set to one state. The zero potential from the inverted output of the trigger 18 blocks the second input of the seventh element I 22 from entering the counting input of the fifth counter 26 pulses from the generator 7. Thus, the operand N is formed in the counter 26, which is the digital equivalent of the angle of rotation of the shaft through the angle

The formation of the operand N occurs similarly to the formation of the operand N. In the initial state, the fifth trigger 18 is reset and from its inverse output to the second input of the sixth element And 21 enters a single potential. The counting input of the fourth counter 25 is continuously received through the sixth element And 21 pulses from the generator 7 pulses (Fig. 2 l). Prior to the arrival of the signal from the TDC sensor 1, the second trigger 11 is reset, and from its inverse output the unit potential is fed to the second input of the fourth element AND 17. By each signal from the sensor 13 EUTT through the driver. 14, the fourth element And 17 is triggered, the signal from the output of which causes the fourth counter 25 to zero (Fig. 2k),

When the sensor 1 TDC is triggered, the second trigger 11 is set to one state and the next pulses of zeroing the counter 25 through the second input of the fourth element 17 from the sensor 13 EPG are blocked from the inverse output with zero potential.

Upon receipt from the ECG sensor 13, a subsequent pulse after TDC Fifth trigger 18 is established by the pulse according to its synchronous input one. The signal from the inverse output of the trigger 18 blocks the arrival of pulses from the pulse generator 7 to the counting input of the fourth counter 25 at the second input of the sixth element I 21, and the formation of the pack N pulses ends. Thus, in the fourth counter 25, N is the digital equivalent of the rotation of the shaft engine angle v. When the first flip-flop 18 is set to one state and when the one-to-one TDC sensor 1 of the second flip-flop 11 is triggered earlier, resolving potentials appear on the first and second inputs of the eighth element And 23. At the output of the eighth element And 23, a readiness signal is set, indicating the completion of the formation of operands N, ..., „L (Fig. 2 m)„ With this signal, the calculating unit 27 performs a sequential sampling of operands from counters 9, 0, 24, 25, 26 through corresponding tire drivers 29,. .29, to the data pin 30 on the respective control signals received from the control bus 31 from the calculating unit 27. The advance angle of the fuel injection start H is determined in block 27 of the calculation according to (1) the formula

4-, + H- + V l (W / N, j + H, -

where H, is the measured angle;

 the angle of rotation of the engine shaft from the moment the injection starts to the first pulse from the ECU sensor 13;

fj is the angle of rotation of the engine shaft from the first pulse from sensor 13 of the ECU after the start of injection to the last pulse, with the same sensor belonging to the measured angle;

H - the angle of rotation of the engine shaft from the last pulse from the sensor 13 of the ECU, belonging to the measured angle, to the pulse from the TDC sensor;

- the angle of rotation of the engine shaft between two adjacent pulses from the sensor 13 of the ECU, into which the pulse from the injection sensor 5 falls;

H - the angle of rotation of the engine shaft

b

between two adjacent pulses with 111 of the sensor 13 EPG, into which the pop gives a pulse from the sensor 1 TDC; H is the angle of rotation of the engine shaft defined as f V - (see p. 5 6 e, fig. Zo); N, Nj ,, N., N, N are the digital equivalents of the time of rotation of the ringed shaft at angles f, f, 1, / 1.4, respectively (Fig. 2, u, l, d, e); I is the magnitude of the angle of the elementary angular displacement. The angle Vn is determined directly by counting the responses of the EEM sensor for the corresponding time interval at I (N, -). Angle V, is determined by the formula,. 2 t, e, by comparing the digital 1X equivalents of time of the measured angle H and the known yivia I, the angle B completely belonging to I. The angle f is determined similarly to -N, In the process of measuring the injection advance angle along the leading edge of the pulse from TDC sensor 1 through the first driver 2 the second trigger 11 is set to one state, and the unit level signal from its direct output goes to the sync input of the eighth trigger 35, since the information input of the eighth trigger 35 is connected to a single potential, the trigger 35 the unit level signal is established and from its direct output goes to the second inputs of the ninth and tenth elements AND 32, 36, respectively. Since the seventh trigger 34 is reset to zero in the initial state, the unit-level signal from its inverse output goes to the third input of the tenth element AND 36 and the pulses of the generator 7 and pulses begin to flow through the tenth element 36 to the counting input of the seventh counter 37 Since at the second input of the ninth element I 32 there is a single potential, the TDC pulses go through it to the counting input of the sixth counter 33. The sixth counting 33 is designed in such a way that c. the moment of arrival of the third TDC pulse at its counting input (i.e., the crankshaft turned two full turns), a single pulse appears at its output 712 of replenishment, which sets the seventh trigger 34 to one state. its direct output Ready-2 enters the control spike 31 of calculating unit 27 (FIG. 3, c), indicating the end of the formation of the operand N. —digital equivalent of two full shaft revolutions, the forcing of which ends in the seventh counter 37, since the signal n the zero level from the inverse output of the seventh trigger 34 blocks the flow of pulses from the generator 7 to the counting input of the seventh counter 37 through the tenth element AND 36 (Fig. 3, h). On the Ready-2 signal, the computing unit 27 samples the operand N via the additional bus driver 38 and proceeds to calculate the rotational speed and the advance injection angle. After the calculation is completed, the results of the calculation are displayed on the indicator 28, and the calculation block 27 generates the signals Request and Request-2, according to which the elements of the device return to their original state, and the device itself is ready for a new measurement cycle. The proposed device makes it possible to calculate the angle of the opera, the fuel feed and the rotational speed of the engine shaft both at each revolution of the engine shaft and at several revolutions (average value). In order to obtain the average rotational speed of the shaft over several full shaft revolutions, the counter 33 can be designed in such a way that the signal. overflow from its output is formed through the required number of revolutions of the shaft. The device allows the formation of the signal request and request-2 in the desired sequence. In addition, the device allows you to first produce the formation of all operands for the required number of cycles, and then calculate the desired values of H and uj. The proposed device allows to expand the functionality due to the simultaneous determination of the angle of fuel advance, the speed of rotation of the engine crankshaft, as well as increase the accuracy of measurements due to the introduction of

parallel measurement of these parameters under the control of the computing unit, which provides an increase in the efficiency of diagnosing the internal combustion engine,

Claims (1)

Invention Formula Device for measuring the advance angle of fuel injection into an internal combustion engine according to auth. No. 1211440, in order to expand the functionality and accuracy of the measurement by measuring the rotational speed of the crankshaft, the ninth and tenth elements And, the sixth and seventh counters are entered into it. , the seventh and eighth triggers and additional bus driver, and the output of the pulse generator is connected to the first input of the tenth And element, the direct output of the second trigger is connected to the synchronizing input of the eighth trigger, the information input of which is connected to a single potential, the output of the first driver is connected to the first input of the ninth element I, the output of which is connected to the counting input of the sixth counter, the overflow output of which is connected to the single input of the seventh trigger, the direct output of the latter is connected to the control bus of the calculating unit, and the inverse to the third input of the tenth And element whose output is connected to the counting input of the seventh counter, the information output of which is connected via an additional bus driver to the data bus of the computation unit, the direct output of the eighth trigger is connected to the second inputs of the ninth and tenth elements of AND, the circuit Request 2 of the control bus of the computing unit is connected to the zero inputs of the sixth and seventh counters and the seventh and eighth flip-flops, and the control circuit of the additional bus driver is connected to the control bus of the computation block.