SU1408276A1 - Device for measuring fuel injection advance angle - Google Patents

Abstract

Invention m. used to diagnose diesel engines. The purpose of the invention is to simplify and increase the reliability of the device. The outputs of the sensors 1 and 2 of the injection and top dead center acc. communicated with the inputs of the formers 3 and 4 signals, the outputs of which are connected respectively. The C inputs of the D-flip-flop 5 and D-flip-flop 6. The D-input of the D-flip-flop 5 is connected to the bus 1, and the direct and inverse outputs are respectively. With the D and R inputs of D-flip-flop 6, the direct output of which is connected to the CP of the D-flip-flop 5. The direct output of the 13-flip-flop 5 is connected to the first input of the And 9 element, and the inverse, output to the counting input trigger 7. The inverse in. output of trigger 7 is connected to the second input of the element 11 and the first input of the buffer element 15, and the direct output to the second input of the element 9 and the output of which is connected to the second input of the buffer element 14. Outputs generator 8 is connected to the per inputs of the elements And 10 and 11, the outputs. to-ryh connected acc. with inputs of counters 12 and 13, outputs to-ryh are connected with sootv. the inputs of the elements 14 and 15. The outputs of the elements 14 and 15 are connected to the first bidirectional bus. data transceiver 16, the second bidirectional data bus to-rogo connected to the trunk information exchange, which is also connected to the transmitter 18, the indicator 19 and the selector 17 addresses. The first and second outputs of the selector 17 are connected to the control inputs of the elements 14 and 15, and the third output is connected to the control input of the transceiver 16. 2 Il. (L from 00 th sl Od

Description

. "Hrt-f

The invention relates to a measurement and control technique for diagnosing internal combustion engines, in particular diesel engines.

The purpose of the invention is to forgive and increase the reliability of the device.

FIG. 1 shows the functional electrical circuit of the device; in fig. 2 - the algorithm of the calculator.

The device for measuring the fuel injection advance angle contains sensors of the process under study (injection) 1 and VMt, (top dead center) 2, drivers 3 and 4 signals, D-flip-flops 5 and 6, countable trigger 7, generator 8 , elements 9-11, counters 12 and 13, buffer elements 14 and 15, the main transceiver 16, the address selector 17, the calculator 18 and the indicator 19.

The output of sensor 1 is connected to the input of the imager 3, the output of which is connected to the C input of the D-flip-flop 5, the D-input of which is connected to the bus 1, and the direct and inverse outputs to the bus. respectively, with the D- and R-inputs of the D-flip-flop 6, the direct output of which is connected to the R-input of the D-flip-flop 5, and the C-input with the output of the driver 4, the input of which is connected to the output of the 2-mt sensor, , the direct output of the D-flip-flop 5 is connected to the first input of the And 9 element, and the inverse output to the input of the counting trigger 7, the inverted output of which is connected to the second input of the 11th element and the first input of the buffer element 15, and - stroke - with the second input element And 9, the output of which is connected to the second input of the buffer element 14, the output of the generator B is connected to the first input And 10 and 11 elements, the outputs of which are connected respectively to the inputs of counters 12 and 13, the outputs of which are connected to the corresponding inputs of the buffer elements 14 and 15, the outputs of which are connected to the first bidirectional data bus of the transceiver 16. The second bidirectional data bus of which is connected to the highway information exchange, where the calculator 18, the indicator 19 and the address selector 17 are also connected, the first and second outputs of which are connected to the control inputs of the buffer elements 14 and 15, and the third

0

5 o q d

five

0

five

course - with control input of the main transceiver 16.

The formers 3 and 4 are designed to normalize the amplitude of the signals from sensors 1 and 2 and can be performed according to any known scheme.

Counters 12 and 13 are designed to calculate digital equivalents of fuel injection advance angle and full engine speed, and in the preferred embodiment, for example, three series-connected four-bit counters can be used in the implementation of the proposed device.

The calculator 18 is designed to control the operation of the device and perform the necessary mathematical operations and may consist, for example, of a microprocessor, a ROM (read only memory) and a RAM (random access memory). The indicator 19 serves to indicate measured values and auxiliary information.

Address selector 17 and trunk transceiver 16 serve to interface between calculator 18 and counters 12 and 13, which in this case are microprocessor external devices.

In the absence of a signal. Reading from the address selector i7, the trunk transceiver is in a passive state with respect to the trunk. When referring to the set addresses, the address selector 17 emits a selection signal (either Select 1 or Select 2) at which one of the buffer elements is triggered (either 14 or 15), and then a Read signal is generated, through which the outputs of the activated buffer element by means of the main transceiver 16 with the information exchange line, which ensures the reading of the corresponding operands.

Buffer elements 14 and 15 are used to connect the inverse output of the counting trigger 7, the output of the element And 9, the outputs of the counters 12 and 13 to the first bidirectional data bus of the trunk transceiver 16, as well as to switch the first and second channels of information reading (signals from the selector 17 addresses).

The device works as follows.

On the leading edge of the injection signal taken from the code of the imaging unit 3, the D-flip-flop 5 is cocked, the low potential from the inverse output of which allows the D-flip-flop 6 to be triggered,

D-flip-flop 6 is then cocked on the leading edge of the signal from the output of the taper 4 (at the moment of passage of the metrotic toner) and thus resets the D-flip-flop 5, the high potential from the inverse output of which blocks the triggering of the D-flip-flop 6 following injection signal.

The pulses formed by the D-flip-flop 5, taken from the inverse output, arrive at the counting flip-flop 7, at the outputs of which pulses are formed, the duration of which is determined by the pulse repetition period from the D-flip-flop 5.

Thus, at the output of the element 9 and the inverse output of the counting trigger 7, signals are generated, the duration of which is determined by the values of the fuel injection advance angle and the periphery of the enabling pulse from the inverse output of the counting trigger 7, the steady state of the counters 12 and 13 (i

Nr).

After zeroing the P cells, and

which serve to count the number of overflows of counters 12 and 13, the readiness (counts) of the 1st counter (counter 12) is expected, i.e. The beginning of the resolution of the arrival of pulses from the generator 8 to the output of the counter 12. After that, the program proceeds to count the number of overflows of the 1st counter PI. Overflows are determined by the transition of the most significant bit of the counter from high to low state, i.e. by its transition from the state 111111111111 to the state 000000000000 (Fig. 2). The overflow is counted until the resolution of the pulses from the generator 8 to the input of the counter 12 is completed, after which the final state of the counter 12 N is recorded.

Following this, the number of overflows of the 2nd counter (counter 13) P is calculated similarly. Overflow

The counter is low or low.

35

40

Period of rotation of the engine shaft. By dan-dd are determined by the transition of the highest signals (at corresponding points in time), the passage of clock pulses from the generator 8 to the inputs of counters 12 and 13 is permitted, ensuring the determination of the digital equivalents of the injection angle and rotation period.

Consider the algorithm of the microprocessor (computer 18),

As can be seen from the diagram (FIG. 1), the reading of the states of the counters 12 and 13 is carried out together with the reading of the corresponding states of the outputs of the element AND 9 and the inverse output of the counting trigger 7, and in

Preferred option

. act as readiness phrases (counts) and can be combined with meter outputs. The lower 12 bits of the standard 16-bit data width (DIM) are assigned to transfer the counter state, and the sign 15th bit is assigned to the corresponding readiness flag (count).

In RAM, calculator 18 is reserved six memory locations.

45

13 of high by transferring it from the state 111111111111 to the state 000000000000 (Fig. 2), the overflow resolution is performed to terminate the admission resolution and pulses from the generator 8 on the input counter 13, after which the final state of the counter 13 N is recorded,

Thereafter, the calculation and indication of the advance injection angle Lf are made, which is calculated by the formula

(/

. 2 4LiEiJL. Jil

N, + P.

M

st

- N

P-

720

N values

who tap

Pm h-1

55

(f.

N

about

H

for storage

PO v o P initialization of the execution of the program (FIG. 2) on the back

where is mj. - counter counting module 12 and 13 (with the same number of bits). After indicating the calculated value of the advance angle and fuel injection in cells N Ji and N J, hall. values of N {and N J are cleared

P. and ry cells,

P- and measurement cycle

The counter is low or low.

determined by senior transition

13 of high suction by passing it from the state 111111111111 to the state 000000000000 (Fig. 2), the overflow is counted until the resolution of the pulses from the generator 8 to the input of the counter 13 is terminated, after which the final state of the counter 13 N, is fixed.

Thereafter, the calculation and indication of the advance injection angle Lf are made, which is calculated by the formula

. 2 4LiEiJL. Jil

N, + P.

M

st

- N

P-

720

(one)

gQ

55

where is mj. - counter counting module 12 and 13 (with the same number of bits). After indicating the calculated value of the advance angle and fuel injection in cells N Ji and N J, the hall sy-. values of N {and N J are cleared

P. and ry cells,

P- and repeat measurement cycle

In the case when the pulse duration from the output of the AND 9 element is extremely small (which may be, for example, at the injection advance angle close to O), the microprocessor of the calculator 18 records the state of the i-th counter (counter 12) as the value N. and Immediately proceeds to count the overflows of the 2nd counter (counter 13), as described above (Fig. 2).

In addition, in the case where the injection angle becomes negative (the leading edge of the injection pulse follows the leading edge of the VMT pulse), the result of calculating if (Fig. 6) will be the value. a large 180 and, in this case, the microprocessor of the calculator 18 recalculates the obtained value according to the form

C q - 360

(2)

1 - the value of the injection angle, calculated by the formula (1); Lf is the actual injection angle (negative number).

The implementation of the proposed device gg gera, the inverse output of which is based on commercially available microfaxes allows the development of small-sized portable diagnostic instruments that can be widely used for diagnostics and adjustment of diesel engines,

invention formula

I A device for measuring the angle of the fuse-> fuel injection week containing a sensor connected to the process under investigation and the first signal generator, successively connected a top dead-eye sensor and a second signal generator Pov, counting trigger, connected in series the first element I with the first And the second inputs and the first counter, Consistently connected the second element And with the first and second inputs

35

40

45

It is connected with the second input of the second element And the first input of the second buffer element, and the direct output of the counting trigger is connected to the second input of the third element And whose output is connected to the second input of the first element And the first input of the first buffer element, the outputs of the first and second counters connected to the corresponding inputs of the first and second buffer elements, the control inputs of which are connected respectively to the first and second outputs of the address selector, the third outflow of which is connected to the control input of the trunk first transceiver, first

V

50

the bidirectional data bus of which is connected to the outputs of the first and second buffer cylinders, and the second bidirectional data bus is connected to the information exchange line.

P

five

five

and the second counter, the generator, the output of which is connected to the first inputs, the first and second elements, And, the third element And with the first and second inputs, connected to the information exchange bus calculator, indication- torus and address selector with the first, second and third outputs, for example, in order to simplify and increase reliability, the device is additionally equipped with first and second 0-triggers, the first and second. Buffer elements and the main transceiver with the first and second bidirectional data communication buses, the direct and inverse outputs of the first D-flip-flop being connected respectively to the D- and. P-inputs of the second D-flip-flop, the direct output of which is connected to the P-input of the first D-flip-flop; the output of the first D-flip-flop is connected to the first input of the third element I, and the inverse output is connected to the input of the counting trigger

five

0

five

It is connected with the second input of the second element And the first input of the second buffer element, and the direct output of the counting trigger is connected to the second input of the third element And whose output is connected to the second input of the first element And the first input of the first buffer element, the outputs of the first and second counters connected to the corresponding inputs of the first and second buffer elements, the control inputs of which are connected respectively to the first and second outputs of the address selector, the third outflow of which is connected to the control input of the trunk first transceiver, first

V

the bidirectional data bus of which is connected to the outputs of the first and second buffer cylinders, and the second bidirectional data bus is connected to the information exchange line.

Claims (2)

Claim A device for measuring the angle of one ^ fuel injection reduction, containing a Serially connected sensor of the Investigated Process and a first signal conditioner, a serially connected top dead center sensor and a second signal former ~ Pov, a counting trigger, a series of connected the first element AND with the first and second inputs and the first counter , Serially connected to the second Element And with the first and second inputs and the second counter, a generator whose output is connected to the first inputs of the first and second elements And, the third ment and the first and second inputs connected to the data exchange line calculator, The indicator. a torus and an address selector with first, second and third outputs, which entails that, in order to simplify and increase reliability, the device is additionally equipped with first and second E-triggers, first and second buffer elements, and a trunk transceiver with first and second bi-directional data exchange buses, the direct and inverse outputs of the first D-flip-flop connected respectively to the D-and. P-inputs of the second D-trigger, the direct output of which is connected to the P-input of the first D-trigger, the C-input of the first D-trigger is connected to the output of the first driver, the C-input of the second D-trigger is connected to the output of the fluorine driver, the direct output of the first The D-trigger is connected to the first input of the third element And, and the inverse output is connected to the input of the counting trigger, the inverse output of which is connected to the second input of the second element And to the first input of the second buffer element, and the direct output of the counting trigger is connected to the second input of the third element nta And, the output of which is connected to the second input of the first element And and the first input of the first buffer element, the outputs of the first and second counters are connected to the corresponding inputs of the first and second buffer elements, the control inputs of which are connected respectively to the first and second outputs of the address selector, the third output of which connected to the control input of the main transceiver, the first bi-directional data bus of which ^ is connected to the outputs of the first and second buffer cylinders, and the second bi-directional bus data is connected to the information exchange trunk. Ί 4082.76 FIG. 2 Compiled by P. Filippov