SU1460652A1 - I.c. engine diagnosis unit - Google Patents

Abstract

The invention allows an increase in the number of diagnosable parameters. And automates the measurement process. The device contains a sensor (D) 1 of the process under investigation, D 2 upper dead center (TDC) I shapers 3 and 4. fig. signal generator, pulse shaper 5, strobe 6, control delay block 7, switches 8-10, countable trigger 11, element AND 12-14. generator 15, first and second counters 16 and 17, first and second calculators 20 and 21, blocks 22-26 acc. control mode, comparison, memory and indication settings. In the modes of measuring the angle of advance and the duration of the process under study, at the outputs of the elements 13 and 14 alternately time intervals are formed corresponding to the duration of the process, the phase shift of which relative to the signal produced by D 2 top dead center (TDC) is measured in this mode of operation and the duration of one period of the test process. In the modes of power measurement in the absence of marks D 2 VMT and its marks on the outputs of the elements And 13 and 14 are alternately formed in terrestrial intervals, the duration of which correspond to one period of the signal corresponding to the diesel engine injection-injection interval or VMT-VMTt 1 Il. (L

Description

SP

The invention relates to the diagnosis of internal combustion engines, in particular, devices for assessing the technical condition of engines and can be used in the diagnosis of diesel engines.

The purpose of the invention is to increase the number of diagnosed parameters and automate the measurement process,

The drawing shows a diagram of the device.

A device for diagnosing an internal combustion engine comprises a sensor 1 of the process under investigation,. sensor 2 of the upper dead point (TDC), drivers 3 and 4 signals, driver 5 pulses, strobe 6, unit 7 controlled delay, switches 8-1 Oj counting trigger P, first 12, second 13 and third 14 elements I , generator 15, first 16 and second 17 counters, first 18 and second 19 buffer elements, first 20 and second 2, calculators J mode setting unit 22, control unit 23, comparison unit 24 memory block 25 and display unit 26,

The output of sensor 1 of the process under study is connected via the driver 3 of the signal to the first input of the driver 5 shuhls, the second input of the switch 9 and the second and third inputs of the switch 10 and the input of the controlled delay unit 7, the output of which is connected to the strobe input and the first input of the switch 8 j the output of the latter is connected to the second input of the pulse generator 5, the output of which is connected to the first inputs of the switches 9 and 10.

The third and fourth inputs of the switch 9 are connected to the positive output of the power source, and the fourth input of the switch 10 is connected and the second input of the switch 8 is connected via a driver 4 signals to the output of the TDC sensor 2, the output of the switch 9 is connected to the first input of the And 12 element, the output of which is connected the second input of the buffer element 18 and the second input of the AND element 13, the output of the latter is connected to the input of the counter 16, the output of which is connected to the first input of the buffer element 18, the output of the switch 10 is connected to the input of the counting trigger 11, n The output of which is connected to the second input of the element 12 and the inverse output to the second input of the buffer element 19 and the second input of the element 14, the output of which is connected through the counter 17 to the first input of the buffer element 19. The first inputs of the elements 13 and 14 are connected To the output of the generator 15, the outputs of the buffer elements 18 and 19 are connected to the second input of the unit 23 and the information input of the calculator 20, the first output of which is connected to the first input of the control unit 23, and the first and second outputs of the latter are connected to the control inputs of the buffer elements at T8 and 19 respectively. The third and fourth outputs of block 23 are connected to the first and second control inputs of the calculator 20, the second output of which is connected to the first input of the comparison unit 24 and the information input of the memory block 25, and the output of the last 21 is connected to the information input of the calculator 21, the first output of the calculator 21 connected to the information input of the display unit 26, the second output to the control input of the memory unit 25, and its additional input is connected to

the seventh output of the control unit 23, the sixth output of which is connected to the input of the mode setting unit 22, and the fifth with the second input of the comparison unit 24, the output of which is connected to the third input of the unit 23, the output of the unit 22 is connected to the control inputs of the switches 8-10J of the unit 23, the controllable delay unit 7, the display unit 26 and the calculator 21, and the fourth input of the control unit 23 is connected to the output of the display unit 26.

The device works as follows

In accordance with the device operation mode set in block 22, the following signals are received at the first input of element 12 and the input of counting trigger 11, respectively: in the measurement of the angle of advance of the process under study (sharp o) the impulses from the imager 5, durability which is determined by the phase shift of the signals of the formers 3 and 4 | in the mode of measuring the duration of the process under study (mode I) - pulses from the output of the imager 3j in the mode of power measurement (in the absence of marks from the TDC sensor) (output; I will give II) - the level of the logical unit and pulses from the output of the imager 3; in the mode of power measurement (according to marks of the TDC sensor) (mode III). 1460652

the level of the logical unit and the pulse- 4 pulses calculated by the calculator 20 from the output of the imaging unit, the performance of two consecutive time In modes O and I at the outputs of the element intervals are stored in blocks 13 and 14 alternately forming memory 25 ti. After calculating the time intervals, the durations of the two are correspondingly the duration of the process, the phase consecutive time intervals of which are measured in the work performed by the signal from the etching unit 23 (for example, the angle is which chooses in the reverse order of the recording engine for the duration of the injection and the duration of the injection, and the length of the data in the memory block 25 and, depending on one period of the simulated process, on the set in block 22 (for example, p, the injection interval-injection mode of operation calculates the corresponding diesel engine). In the modes, the following diagnostic para-II and III values at the outputs of the AND 13 15 meters elements (for example, the rotation frequency of the co-shaft and 14 alternately form the time-shaft shaft and the corresponding phase intervals, the duration of which is the corresponding values of the advance angle and the duration of one the period of the signal, injection duration for the diesel moving to the input of the counting trigger).

1I (for a diesel engine, this is 20 Upon completion of the operation of calculator 21, respectively, injection-injection intervals, the calculated data is transmitted to and TDC-TDC). An indication block 26, which is displayed in

When the O or 1 mode is set to the control unit 23 corresponding to the selected mode, alternately through de, after which the control unit 23, the buffer elements 18 and 19 reads 25, a signal is received that it is possible to start new information on the state of the counters 16th measurement cycle. In addition to the choice of re- and 17, analyzing the output state of the measurement element of one or another diag- nost I 13 and the inverse output of the counter parameter in the block 22 of the specified trigger 11 (First Ready mode also synchronous high . The potential at the output element of the 30nization of the operation of the entire device in that AND 13, allowing the flow as well, for example, is set of pulse pulses at the output of the counter 16j, the display of the measured parameters, the second Done - high potential; mode on the inverse output output The trigger also controls the operation of the strobe 6. pa, allowing the flow of tact. g When there are signals from the sensor 2 BIT pulses to the input of the counter 17) .. the stroboscope 6 is not used in any- Such alternate control unit 23 of the operating modes device and control of the state of the counters 16, its operation is blocked by the output and 17 ensures reliable synchronization of the unit 7 controlled delays in the operation of the device when measuring 40 ki. However, in the absence of signals of the phase characteristics of the process small from the sensor 2 TDC driver 5 is not the duration (for example, the angle is ahead of time, blocking the operation of the metering injection close to) .J-Q trigger 11, which is not

When detected by the start block 23, it changes its state by the work mark or counter. 16, or to the counters of the process under study, which forms 17, it switches the calculator to the 2D ones of the former 3. As a result, it receives information on the first channel before the start of measurement unit 23. (output of the buffer element 18) and the inquiries switch the calculator 20 to the operation of the latter according to the calculation of receiving information on the second channel for the duration of the given time gO (output of the buffer element 19) and the interval. Upon arrival at block 23, the last signal on the control of the signal about the end of the calculation of the duration of the corresponding duration of the given time interval has been calculated, the latter has switched the channel

receiving information by the calculator 20 (you-55 In this case, two outputs of the buffer element 19 are possible), which one hundredth of the counting trigger 11 - weightedly calculates the graded and discarded calculations. In the first case, the corresponding duration of the queue, the operation of the counter 17 is blocked and the time interval. The calculator 20 causes the zero value of the duration of the given color-bright time interval. In the second case, the operation of the counter 16 is blocked, and pulses from the generator 15 are constantly received at the input of the counter 17, i.e. the counter 17 is in the state of continuous counting, which leads to a looping operation and calculates in the mode setting unit 22 a signal confirming that the device has timestamps from the TDC sensor-2. g In this case, block 22 prohibits the operation of block 7 of the controlled delay (turning off the stroboscope 6) and the second input of the driver 5 through the switch 8 receives pulses of TDC marks

The bodies 20 and in-block control 23 are not in conflict with the output of the former 4.

A signal about the end of the conversion of a given time interval.

In this connection, the control unit 23 transmits to the comparison unit 24 a zero operand value and waits for the occurrence of the readiness signal from the calculator 20 during the preset state. fixed time interval whose value is determined by the outcome of

In this case, the measurement of, for example, the injection advance angle in a diesel engine is performed automatically without the operator’s participation. 15 When setting the modes II and III, the control unit 23 performs alternate connection of the outputs of the buffer elements 18 and 19 to the calculator 20 (switching channels of information

the lowest possible speed of rotation 20) and initiates the transformation of the crankshaft diagnosed. consecutive one after the engine, on which time intervals are taken from - another and their measurements are given by diagnostic. Parameters are written into the 25 memory block. This may be, for example, the rotational speed, several times lower than the minimum rotational speed of the engine when it is idling. When a readiness signal is received from calculator 20 in control unit 23, the latter reads the state of comparison unit 24,

In the case of zero result of the calculator 20, as well as in the case when the readiness signal from you35

The numerator 20 does not enter the control unit 23 after the specified fixed time interval has elapsed, the latter transmits a signal to the mode setting unit 22 indicating that the device does not have time marks 40 current from the TDC sensor 2. On this signal, block 22 enables the operation of block 7 of the controlled delay (switching on the stroboscope 6) and connects its output to

ti. At the same time, a certain threshold value corresponding to a certain part of the free acceleration characteristic of the engine from the minimum to maximum 30 idle speeds is transmitted to the comparison unit 24 of the 25 control unit 23, which allows, by measuring the angular acceleration, calculate the effective power of the engine in a given speed mode.

Each time the readiness signal is received by control unit 23 from calculator 20, the state of comparison block 24 is checked. In this case, when the calculated time interval value is less than the threshold value (,) set by block 23, the latter initiates the calculation of the next time interval before the moment

the second input shaper -5. In this 45, the presetting of a given case is recorded; for example, the measurement of the angle of injection in a diesel engine is made semi-automatically. the manual setting of the required time delay of the formation of light pulses by a stroboscope 6, carried out by combining the threshold value T corresponding to an offset of 23, then in mode II one more next time interval is calculated, and in mode III two next time intervals are calculated, and the control unit 2 initializes the operation of the calculator 21.

marks on the flywheel and crankcase diagnosed engine in a known manner.

In that case, when by block 23, the calculator 21 selects the Ice control, the end of work is fixed from memory block 25, the necessary time switch 20, and the last calculated duration of the time interval is different from zero, block 23 is based on the signal from control block 23

My number is written there before the values and calculates the corresponding values of the effective power. In the mode setting unit 22, a signal confirming the presence in the device of timestamps from the TDC sensor-2. In this case, block 22 prohibits the operation of block 7 of the controlled delay (turning off the stroboscope 6) and the second input of the driver 5 through the switch 8 receives pulses of TDC marks

from the shaper output 4.

In this case, the measurement, for example, of the injection advance angle in a diesel engine, is performed automatically without the operator's participation. When installing the modes II and III, the control unit 23 performs alternate connection of the outputs of the buffer elements 18 and 19 to the calculator 20 (switching channels for receiving information

0) and initializes the conversion. successive successive time intervals and their sequential recording in memory block 25

five

40

ti. At the same time, a certain threshold value corresponding to a certain part of the free acceleration characteristic of the engine from the minimum to maximum idle speeds is transmitted to the comparator unit 24 from the control unit 23, which allows, by measuring the angular acceleration, to calculate the effective power of the engine in a given speed mode .

Each time the readiness signal is received from control unit 23 from calculator 20, the state of comparison unit 24 is checked. In this case, when the calculated time interval value is less than the threshold value (,) set by block 23, the latter initiates the calculation of the next time interval up to the moment when will

prefixed preset

unit 23 threshold value T, then in mode II another next time interval is calculated, and in mode III the next two time intervals are calculated, and control unit 23 initializes operation of calculator 21.

On a signal from control unit 23

The calculator 21 chooses subsequently from the memory block 25 the necessary

my number is written there before the values and calculates the corresponding values of the effective power 714606528

nosti. At the end of the work, calculate the third inputs of the first and second bullet 2 the calculated data of the transmission elements, respectively, about t

are displayed in display unit 26, where the design is characterized by the fact that, from the corresponding mode, after increasing the number of diagnosable

control unit 23 receives signal-parameters and process automation

the possibility of starting a new cyclization, the device additionally

measured with the first and second switches 1, implemented with the control and the measuring mode II, the effective power is selected in the absence of signals from the TDC sensor 2, which is determined in this way (when measuring the phase characteristics of

auxiliary inputs, a third switch, completed with control and two additional inputs, a controllable delay unit with control and additional inputs,

- - l --.---- and - dl, i OAU ClIrlJr

engine), except that, 5 stroboscopes, the block setting mode.

in this case, there is no need to use the light marks from the stroboscope, which in this mode is in the highest state.

Completed with an input and output, a comparison unit and a memory unit, each of which is made up with a dium input and one output, and a second computer made with control information and additional inputs and two outputs, a device for diagnosing laziness provided with a second, third, internal combustion engine, containing and controlling inputs and stit- ered in series with date-25, fourth, fifth, sixth and seventh

tick of the process under investigation, the first signal conditioner and the pulse conditioner, the upper dead point sensor and the second signal conditioner connected in series, the first, second and third elements AND, each of which is equipped with two inputs, the first and second counters, the first and second buffer elements, each output , the first calculator is additionally equipped with the first and second. control inputs and output block

the indication is executed with the control input and output, and the pulse shaper is provided with a second input, and the output of the mode setting unit is connected to the control inputs of the first, second and third switches, the control one of which is equipped with three outputs, my delays, the display unit, the second first computer with the information computer and the control unit,

the second input of which is connected to the outputs of the first and second buffer elements, the third input of the control unit provides 40 keys to the output of the comparison unit, its fourth input is connected to the output of the display unit whose information input is connected to the first output of the second calculator, the third and fourth the keys to the second input of the first buffer are the 45 outputs of the control unit of the connected element. and the second input of the second, respectively, to the first and the second AND control unit, the output of which is via the primary inputs of the first calculator,

the first counter is associated with the first one. the output of which is connected with the first input

the house of the first buffer element, the output of the memory unit and the first input of the third element unit; And through the second comparison account, the second input of which the receiver is connected to the first input of the second input to the fifth output of the control buffer element, and the first inputs, the sixth output of the last associated with

the second and third elements And the sub-input of the mode setting block, and the seventh to the generator, the outputs of the first and its output are connected to the additional,

the second buffer elements are connected with the 55 input of the second calculator, the information input of the first loop; the second input of the memory unit is connected to the second one, the output of which is connected to the first output of the second calculator, the input to the control unit, the first information input of which is connected

and the second outputs of which are connected by the sk output of the memory unit, the output of the first

an input, a control unit with two outputs, a display unit, a generator and a counting trigger, the direct output of which is connected to the second input of the first element AND, and the inverse output of the trigger is connected to the second inputs of the third element AND of the second buffer element, the output of the first element And additional piping inputs, a third switch, made with control and two additional inputs, a control delay block with control and additional inputs,

 --l --.---- and -dl, i OAU ClIrlJr

strobe, block task mode.

91460652 About

Signal driver additional switch and the fourth input

connected to the second input of the first, second switch, the output of the switch generator. the second and third impulse inputs are connected to the first

I will give the second switch and additional inputs to the first and second switch input of the controllable delayed block, the outlets of which are connected to the output of which is connected to the input of the gate to the first input of the first

Osprey and the first input of the third comm-element I and the input of the counting trigger,

tator, the output of the latter is connected to the third and fourth inputs of the first

the second input of the pulse generator (switch) is made to connect

the output of the second driver sig-k signal source, the level of logical

The cable is connected to the second input of the three-unit.

Claims (1)

Claim A device for diagnosing an internal combustion engine, comprising a series-connected sensor of the process under study, a first signal shaper and a shaper with inputs and two outputs, a control unit equipped with a second, third, fourth and control inputs and a third, fourth, fifth, sixth and seventh outputs, a first calculator before- | the first and second pulser, serially connected top dead center sensor and second signal conditioning instrument, 39 first, second and third AND elements, each of which is equipped with two inputs, the first 'and second counters, the first and second buffer elements, each of which equipped with three outputs, the first calculator with an information input, a control unit with two outputs, an indication unit, a generator and a counting trigger, the direct output of which is connected to the second input of the first ₄₀ AND elements, and the inverse trigger output p connected to the second inputs of the third AND element and the second buffer element, the output of the first AND element is connected to the second input of the first buffer element 45. and the second input of the second AND element, the output of which through the first counter is connected to the first input of the first buffer element, the output of the third element And through the second count-gQ, the chip is connected to the first input of the second buffer element, and the first inputs of the second and third elements And are connected to the generator, the outputs of the first and second buffer elements are connected to 55 information input of the first calculation u. control inputs and outputs, the display unit is made with a control input and output, and the pulse shaper is equipped with a second input, and the output of the mode setting unit is connected to the control inputs of the first, second and third switches, a controlled delay unit, an indication unit, a second calculator and a control unit, the second input of which is connected to the outputs of the first and second buffer elements, the third input of the control unit is connected to the output of the comparison unit, its fourth input is connected to the output of the display unit, information the input of which is connected to the first output of the second computer, the third and fourth outputs of the control unit are connected respectively to the first and second control inputs of the first computer, the output of which is connected to the first input of the memory unit and the first input of the comparison unit, the second input of which is connected to the fifth output of the unit control, the sixth output of the latter is connected to the input of the mode setting unit, and its seventh output is connected to an additional input of the second computer, the second input of the memory unit is connected to the boiler, the output of which connected to the first input of the control unit, the first and second outputs of which are connected to the eye of the second computer, the information input of which is connected to the output of the memory unit, the output of the first 9 1460652 10 of the signal shaper is additionally connected to the second input of the first switch, the second and third inputs of the second switch and an additional _g input of the controlled delay unit, the output of which is connected to the strobe input and the first input of the third switch, the output of the last connected to the second input I of the ¹ pulse - ιθ owls, the output of the second signal conditioner is connected to the second input of the third switch and the fourth input of the second switch, the output of the pulse former is connected to the first inputs of the first and the second switches, the outputs of which are connected respectively to the first input of the first AND element and the input of the counting trigger, and the third and fourth inputs of the first switch are made to connect a logical unit level signal source. • Compiled by A.Zolotov Editor A. Kozorez Tehred A. Kravchuk Proofreader V. Girnyak Order 537/52 Circulation 788 Subscription .VNIIIPI State 113035, Committee for Inventions and Discoveries at the State Committee for Science and Technology of the USSR Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhgorod, st. Gagarina, 101