SU1286925A1 - Device for measuring advance angle of fuel feed to internal combustion engine - Google Patents

Abstract

The invention relates to engine building and allows to increase the accuracy and expand the field of application. The device contains a sensor 1 start process, the formers 2,

Description

 /

4, 6 pulses, sensor 3 upper dead center, sensor 5 corner marks, RS-trigger 7, elements And 8, 12, 13, generator 9 pulses, counters 10, 14, 15, D-triggers 11, 16, 17, 19 , inverter 18, replaceable formers 20,21,22, control and data bus 23,24 of calculation unit 25 and indication unit 26. As a reference angle, take the angle as close as possible to the desired one and maximally invest in it. The rotational speed at the desired angle and is almost equal to the rotational speed at the reference angle CD, and, therefore, the following relations are fulfilled, 03 00, (, "-P, / tf q, / Nxtr q, / N, tr: cfx),

Cf, (N 2 - 1) 9, because

Cj, (Nj -1) 9 5 where tp, is the value of the desired angle; Cf - the value of the reference angle; tj (is the time of rotation to the desired angle; t, is the time of rotation to the reference angle, t is the duration of the period of the clock generation

torus 9; Njj, N, digital equivalent of time t, t, N, is digital

equivalent of the reference angle, b - large I

the rank of the known angle between two adjacent pulses from the corner sensor I

tags. The device has the ability to accurately determine the desired angle and in non-stationary modes of operation of the engine about 2 Il.

one

The invention relates to testing machines, in particular, to measuring engine parameters, namely, determining the angular position of the engine crankshaft between two predetermined points and determining the rotational speed at this interval.

The purpose of the invention is to improve the accuracy and spread of the field of application of the device.

FIG. 1 shows a functional diagram of the device; in fig. 2 - timing diagram of the elements of the device and the calculation process (a - pulse generator operation; b - request signal; i c - signals at the output of the third pulse generator; d - signals at the output of the second pulse generator; e - signals at the output of the first pulse generator; the input of the first counter; W - the signals at the input of the third counter, h - the signals at the input of the second counter, and - the signal Readiness).

 The device contains a sensor 1, the beginning of the process, the first driver 2 pulses, the sensor 3 TDC, the second driver 4 pulses, the sensor 5 corner marks, the third driver 6 pulses, RS-trigger 7, the first element And 8, the generator 9 pulses, the first counter 10, the first D-trigger 11, second 12 and third 13 elements

And, the second 14 and third 15 counters, the second 16 and third 17 D-flip-flops, inverter 18, fourth D-flip-flop 19, first 20, second 21 and third 22 bus drivers, control unit control bus 23, calculation unit data bus 24, calculating unit 25, display unit 26.

The sensor 1 of the beginning of the process is connected via the first shaper 2 pulses to the single input K8-trigger 7, the direct output of which is connected to the second input of the first element of the element 8 and the output of which is connected to the counting input of the first counter 10. The output of the TDC sensor is connected to the input second shaper 4 pulses. The output of the generator 9 pulses connected to the first inputs of the first and third elements And 8 and 13, respectively. The output of the third element And 13 is connected to the counting input of the second counter 14, the Calculation unit 25 is connected via the control bus 23 to the first input of the display unit 26 and through the data bus 24 to the second input of the display unit 26. Direct output RS-flip-flop 7 is connected to the information inputs of the first and second D-flip-flops 11 and 16, respectively. The output of the second driver 4 pulses is connected to the synchronization input of the second D-flip-flop 16, the direct output of which is connected to the information input

the third D-flip-flop 17, a inverse 1 to the third input of the first element AND 8. Sensor 5 corner marks through the third driver 6 pulses connected to the synchronized inputs of the first and third D-triggers 11 and 17, respectively, and the first input of the second element And 12, the output of which connected to the counting input of the third counter 15 and the input of the inverter 18. The direct output of the first D-flip-flop is connected to the second inputs of the second and third elements And 12 and 13, respectively. The direct output of the third D-flip-flop is connected to the information input of the fourth D-flip-flop 19, the inverse to the third input of the third element And 13. The output of the inverter 18 is connected to the clock input of the fourth B-flip-flop 19, the inverse output of which is connected to the third input of the second element And 12, and direct to the bus 23 of the control unit 25 of the calculation. The information outputs of the first 10, second 14, and third 15 counters are connected via the first, second, and third bus drivers 20-22, respectively, to the bus 24 given by block 25 of the calculation. Circuit Bus request 23 of control unit 25 of calculation is connected to the reset inputs of RS-flip-flop 7, all D-flip-flops 11, 16, 17 and t9 and all counters 10, 14 and 15 Control circuits of bus formers 20-22 are connected to corresponding outputs of bus 23 control block 25 calculation.

The elements of the device have the following purpose.

The sensor 1 start the process generates an electrical signal at the time of the start of fuel injection. TDC sensor 3 generates an electrical signal when the piston is in the TDC. Dat

A tick of 5 corner tags generates an electric 45 K155AGZ. Tire shapers 20-22

signal through the known angle of rotation of the crankshaft of the engine. Formers 2, 4, and b normalize signals from sensors 1, 3, and 5 in amplitude and fronts. RS flip-flop 7 and D-flip-flops 11, 16, 17 and 19 are used to set the time intervals filled with pulses from the generator 9 pulses and pulses from the sensor

5 corner marks, as well as to develop a 55 system. Sensor 1 start the process, ki signal Ready. The first element, for example, the sensor of the start of injection, the moment I 8, serves to form a marker of a pack of N pulses — a digital screen for the start of the injection. The sensor 3 TDC of a dual device of the desired angle of rotation is expected to be made in the form of a microwave mark.

where 9

engine shaft. (Fig. 2e). The third element And 13 is used to form a pack of N, pulses - digital equivalent of the reference angle qi of the rotation of the engine shaft (Fig. 2). The second element 12 serves to form a bundle N of pulses — a digital equivalent of the reference angle Cf of the rotation of the engine shaft (Fig. 2g). Counters 10, 14, and 15 serve to form and buffer the N, N, and N operands, respectively. Bus drivers 20-22 serve to buffer data from external devices (counters) when operating on a common bi-directional data bus 24 of the computation unit 25. The control bus 23 of the calculation unit 25 is bidirectional and serves for the control signals to communicate with external devices. Inverter 18 serves to invert the signal from the second element AND 12. The calculation unit 25 serves to control the operation of external devices and to calculate the desired angle according to the formula

.. -1 (N - 1) -9

where 9

the magnitude of the known angle between two adjacent signals from the sensor 5 corner marks.

The 26-display unit serves to output the result of calculating a detectable angle.

Digital elements: RS-flip-flop, D-flip-flops, counters, And elements,

the inverter can be made on the basis of standard digital integrated circuits series 133, K561, etc. The generator 9 pulses can be performed according to a typical scheme on the basis of the driver

can be made on the basis of integrated bus formers of the type -K589AP16. The display unit 26 is a typical output device, for example on the basis of a printing device. The computing unit 25 is made, for example, on the basis of a microcomputer (of the type Electronics-BOM) or on the basis of any microprocessor-based computing

five

Chica or induction type. Sensor 5 corner marks can be made in the form of a marker that generates an electrical signal when the crankshaft is rotated at a known angle, for example in the form of an induction type sensor rigidly connected to the engine body and fixing the passage of each flywheel gear past it.

The device works as follows.

In the initial state, the device is zeroed out or according to rigid programs

when the computation unit 25 is generating

signal Request, or external signal Reset, All D-triggers, counters and RS-flip-flop come to their original (zero) state. When rotating the engine's motor, sensor 1 of the beginning of the process generates electrical impulses at the moment of the start of injection (Fig. 2d). The TDC sensor 3 generates electrical pulses at the time of the arrival of the piston in the BMT (Fig. 2e), the Corner Tag Sensor 5 generates electrical pulses through the known angle 9 of the motor shaft (Fig. 2c). The signal from sensor 1 of the start of the process goes through the first driver 2 pulses to a single input of RS flip-flop 7. RS-flip-flop 7 is set to 1, and the signal of a single level from its direct output goes to the information inputs of the first and second D-flip-flops 11 and 16, respectively, and to the second input of the first element And 8, Since in the initial state the second D-flip-flop 16 is reset, then its inverse output has a signal of a unit level, which is fed to the third input of the first element And 8, Therefore, the pulses of the generator 9 are highly stable Ny frequencies begin to flow to the counting input of the first cutter 10. With further shaft rotation, the signal from the sensor 5 of the angle marks through the third driver 6 pulses goes to the clock inputs of the first and third D-flip-flops 11 and 17, respectively, and to the first input of the second element I 12. The first D-flip-flop 11 is set to 1 and the unit-level signal from its njpHMoro output goes to the second inputs of the second and third elements AND 12 and 13, respectively. Since in

shaper 6

the initial state at the inverse output of the third D-flip-flop 17 there is a signal of a single level, which is fed to the third input of the third element And 13, then the pulses of the stable frequency generator 9 begin to flow through the third element And 13 to the counting input of the second counter 14. Since in the initial state When the fourth D-flip-flop 19 is zero, the signal of a single level from its inverse output goes to the third input of the second element 12 and the pulses from the sensor 5 angular marks through the third

pulses and second

five

0

element 12 begins to arrive at the counting input of the third counter 15. With further shaft rotation, the signal from the TDC sensor 3 through the second generator 4 pulses arrives at

the synchronization input of the second D-flip-flop 16, which is set to 1, and the unit-level signal from its direct output goes to the information input of the third D-flip-flop 17, and the zero level signal from the inverse output of the second D-flip-flop 16 goes to the third input of the first element 8, blocking the further arrival of the pulses of the generator 9 to the counting input of the first counter 10. Thus, in the first counter 10, the operand Ny - digital is formed. equivalent time of motor shaft rotation at the required angle q) (Fig. 2e). Upon further rotation of the shaft, the signal from the sensor 5 of the angular marks enters through the third driver 6 to the clock input of the third D-flip-flop 17, which is set to one state, and the unit-level signal from its direct output goes to the information input of the fourth D-flip-flop 19, and the zero signal from the inverse output,. The third D flip-flop 17 is fed to the third input of the third element I 13, blocking the further arrival of the generator 9 pulses to the counting input of the second counter Ca 14. Thus, in the second counter 14, the operand N, the digital equivalent of the motor shaft turning time, is generated from the arrival of the first pulse from the sensor 5 corner marks after the trigger of sensor 1 of the start of the process until the arrival of the first pulse, from the sensor 5 corner marks

0

five

0

after triggering of the TDC sensor 3 (FIG. 2z), the last signal from the sensor 5 angle marks, passed through the third driver 6 pulses, the second element 12 and the inverter 18, goes to the clock input of the fourth D-flip-flop 19, which is set to one on the rising edge of the signal. The unit level signal from the direct output of the fourth p-flip-flop 19 (Ready signal in Fig. 2i) goes to the control bus 23 of the calculating unit 25 and indicates that the formation of all operands is complete, and the zero level signal is inverse output of the fourth D-flip-flop 19 is supplied to the third input of the second AND gate 12, blocking further flow of pulse sensor 5 with angular marks on the count input of the third sensor 15. Hence, the counter formed in the third operand N. digital equivalent of the angle of rotation of the motor shaft at an angle from the moment of arrival of the first pulse from the sensor 5 angle marks after actuation - sensor 1, the start of the process to the moment of arrival of the first pulse from the sensor 5 angle marks after the TDC sensor 3 triggered (Fig. 2g). With the arrival of the Ready signal, the computation unit 25 performs sequential sampling of the N, N, N operands from counters 10, 14 and 15, respectively, via the corresponding bus drivers 20, 21 and 22 to the data bus 24 using the corresponding control signal received from the control bus 23. Upon completion of the sample of one rand N, N, N2 into the internal memory, the calculation unit 25 proceeds to the calculation of the required angle (the desired angle C) is determined in the calculation unit 25 by the formula

4. N, -1

N

(N, - oh

At the end of the calculation of the angle Ц. the calculating unit 25 outputs the result to the display unit 26 via the data bus 24 via the corresponding signal from the control bus 23 and issues a Request signal (Fig. 26), in which the elements of the device return to their initial state and the device itself is ready for the next measurement cycle, providing continuous measurement

ten

69258

the desired angle in real time.

The effectiveness of the proposed device lies in a more accurate determination of the desired angle, as well as in the possibility of determining this angle in non-stationary engine operation modes. In the prototype, the required angle is defined as the ratio of the time equivalent of N of the desired angle to the time equivalent of N. The two full revolutions of the engine shaft are multiplied

at the angle of two full revolutions of the shaft - 720. This ratio is based on the equality of rotational speeds at two full revolutions of the shaft (720 ° -co) |, -CO,:

and at a definable angle

20

L

N,

25

However, due to the uneven speed of rotation of the shaft within one cycle, this ratio is inaccurate. corner

le q different. In the proposed device as a reference angle

since the rotational speeds 720 and at an angle of 720

J and the maximum angle

but close to the desired angle and maximally embedded in it (Fig. 2c, g) (the maximum difference between these angles can only reach 20). Therefore, the speed of rotation at the desired angle, co, (almost equal to the speed of rotation at the reference angle, G3, and, therefore,

,

J. t.

 ., iLL.

N.

N "

, --- c, N ,.

N

 (N2 - i) -s,

since (, (N5, - 1) b (fig, 2g),

where a is the rotation speed at the desired angle

CO, - rotational speed on

Mr. Coal;

CPx value of the desired angle;

cp is the value of the reference angle;

t - time of rotation of the angle;

tj - time of rotation to the reference angle 5

the duration of the period of the clock generator 9 digital equivalent time t

t

To „N. .0- in X

digital equivalent of time t ,,

digital equivalent of an angle of 720 °,

the magnitude of the known angle between two adjacent pulses from the angle tag sensor,

In addition, since the rotational speed of the shaft on non-stationary work speeds varies not only within the revolution, but also from revolution to rotation, the accuracy of measuring the desired angle with the prototype decreases, which limits its use in these modes.

The proposed device, in view of the practical equality of the rotational speeds at the designated and reference angles, has the ability to accurately determine the desired angle even in non-stationary engine operating modes.

If an injection start sensor5 is used as a process start sensor, and instead of an BMT sensor, an injection end sensor is used, the device determines the feed angle of fuel. In general, the device determines the angle of any process in the engine when there are signals about the beginning and end process as well

rotation speed on

the invention

A device for measuring the fuel advance angle to an internal combustion engine, comprising a sensor for starting a process, an upper dead center sensor, first and second pulse drivers, short-circuit trigger, first, second and third elements And, first and second counters, pulse generator, calculation unit and a display unit, the process start sensor being connected via the first pulse shaper to a single input of the RS flip-flop, the direct output of which is connected to the second input of the first element I, the output of which is connected to the counting input the first counter, the upper sensor output, a dead point

five

0

five

0

0

five

connected to the input of the second pulse generator, the output of the pulse generator is connected to the first inputs of the first and third elements AND, the output of the third element I is connected to the counting input of the second counter, the calculation unit is connected via the control bus to the first input of the display unit and through the data bus to the second input display unit, so that, in order to increase the accuracy and expand the scope of application, the angle mark sensor, the third pulse generator, the first, second, third and fourth D-trig The first, second, and third bus drivers, the direct output of the RS flip-flop is connected to the information inputs of the first and second D-flip-flops, the output of the second pulse shaper is connected to the clock input of the second D-flip-flop, the direct output of which is connected to the information input of the third D-flip-flop, and inverse - to the third input of the first element And, the angle mark sensor via the third pulse shaper connected to the clock inputs of the first and third D-flip-flops and the first input of the watt The first element is And, the output of which is connected to the counting input of the third. meter and inverter input, right

-5 the output of the first D-flip-flop is connected to the second inputs of the second and third And elements, the direct output of the third D-flip-flop is connected to the information input of the fourth D-flip-flop, and the inverse to the third input of the third And element, the output of the inverter is connected to the sync input of the fourth D-flip-flop, the inverse code of which is connected to the third input of the isTOporo element I, and direct to the control bus of the calculating unit, the information outputs of the first, second and third counters are connected via the first, second and third busbars

 the drivers to the data bus of the computing unit, respectively, the circuit. The query of the control bus of the calculation block is connected to the zero inputs of the RS flip-flop, all D-flip-flops and all counters, and the control circuits of the tire shaping units are connected to the corresponding outputs of the control bus of the calculation block.

NX

N2

|. .

Uul

fi 2

Claims (1)

Claim A device for measuring the lead angle of the fuel supply to the internal combustion engine, comprising a process start sensor, top dead center sensor, first and second pulse shapers, RS trigger, first, second and third elements And, first and second counters, pulse generator, calculation unit and an indication unit, wherein the process start sensor is connected via a first pulse shaper to a single input of the RS flip-flop, the direct output of which is connected to the second input of the first element And, the output of which is connected to the counting input the first counter, the output of the top dead center sensor to the second inputs of the second and third AND elements, the direct output of the third D-trigger is connected to the information input of the fourth D-trigger, and the in40 version is connected to the third input of the third And element, the inverter output is connected to the clock input the fourth D-flip-flop, the inverse output of which is connected to the third input 45 of the second element And, and the direct to the control bus of the calculation unit, the information outputs of the first, second and third counters are connected through the first, second and third bus The 50th formers to the data bus of the calculation unit, respectively, the Request bus for the control unit of the calculation unit is connected to the zeroing inputs of the RS-flip-flop, all D-flip-flops and all 55 counters, and the control circuit of the bus-former is connected to the corresponding outputs of the control bus of the calculation unit. L Π L NIN IIIIHHHI 11II11 II 1 -H ί t Nx ίιιιιιιιιιιιιιιιιιιιι llllllllllllllllll II llllll 1 . Νΐ _ lllllllllllllllll 1 llllllllllllllllllll - FIG. 2