SU1652858A1 - Device for monitoring performance parameters of internal combustion engine - Google Patents

Abstract

A device for monitoring the parameters of an internal combustion engine (ICE) is used to determine the number of cylinders, the number of revolutions of the crankshaft, the ignition advance angle and the secondary voltage of the ignition coil on each spark plug and provides an increase in the reliability of the control. It contains the top dead center sensor 1, the ignition sensor sensor 3, the first 2, the second 4, the third 20 and the fourth 22 signal conditioners, the first 5 and the second 21 one-oscillators, the processor 6, the blocks 11 and 12 of the permanent and main memory, 16 clock pulse generator, first 13 and second 14 control signal generation units, data input connection pins, display unit 15, first 17, second 18 and third 19 electronic switches, source of reference signal 26, voltage-to-frequency converter 24, divider 25 The principle of operation of the device is about Nova for filling a specified time interval proportional to the value of the measured parameter, the fixed frequency clock signal, and calculating the numerical values of this magnitude in the processor. 2 Il. Ј (L s

Description

FIELD OF THE INVENTION The invention relates to engine oolast, namely, means for testing and diagnosing internal combustion engines (ICE).

The purpose of the invention is to enhance the functionality of the device by measuring the secondary voltage of the ignition coil in the circuit of each candle and increasing the reliability of control by checking the measurement and calculation path.

FIG. 1 shows a block diagram of the device; 2 (a, b, c, d, d, e, g, z, u, k, l, m) —time diagrams characterizing the state: a — output of the TDC sensor; b - ignition signal sensor output; in - the output of the first shaper; g - output of the second shaper; d - exit third shaper; e is the output of the first one-shot; W - signal recording to the peak detector; h - output peak detector; and - voltage-to-frequency converter output}; - trigger signal of the second one-to-one torus; l - the output of the second one-shot; m - output of the fourth signal conditioner.

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The device contains the upper deadway point sensor 1 (TDC) connected in series and the first driver 2 signals, the sensor 3 ignition signals, the second Shaper 4 signals, the first single vibrator 5, the processor 6, the first 7, the second 8, the third 9 and the fourth 10 of the data bus , the block .11 of the permanent memory, the block 12 of the RAM, the first 13 and the second 14 blocks of the formation of the control signals, the display unit 15, the generator 16 clock pulses, the first 17, the second 18 and the third 19 electrically switches, the third signal shaper 20, the second one p 21, fourth measurement end signal generator 22, peak detector 23, voltage-to-frequency converter 24, frequency divider 25, reference signal source 26 and programmable timer 27. Processor 6. provided with control inputs 28.1 ... 28.N and signal outputs. 29.1 ... 29.M (where N, M - integers)

The second 14 control signal generation unit is intended for setting the operation modes of the processor 6 and comprises a key matrix 30, an addition logic 31 and a single-file 32. The key matrix 30 is provided with key contacts 33.1.-. 33.N and resistors 34.1. „. 34.N. The display blog 15 includes a decoder 35 and an indicator array 36 made on LEDs 37.1 ... 37.P.

The output of the first driver 2 is connected to the trigger input of the first single-shot 5, the input of the third driver 20 and the first interrupt input of processor 6, the output of the ignition signal sensor 3 is connected to the input 7 of the second driver 4 and is additionally connected to the first input of the third electronic switch 19, the second the input of which is connected to the output of the source 26 of the reference signal, and the output to the input of the peak detector 23.

The output of the second signal conditioner 4 is connected to the control input of the first single vibrator 5 and is additionally connected to the second input of the pre

jerking the processor 6. The third and fourth interrupt inputs of the latter are connected respectively to the output of the fourth controller 22 and the signal output of the second block 14 form 5 0 5

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control signal worlds. The clock input of the processor 6 is connected to the output of the generator of the clock 16 clock pulses and connected to the clock input of the programmable timer 27 and the input of the divider 25. The first input of the processor 6 is connected via the data name 7 to the input of the permanent memory unit 11, the second input via the bus 8 data and addresses to the input of the memory unit 12, the third input via the bus 9 of data and addresses to the input of the first control signal generating unit 13, and the fourth input via the bus 10 to the input of the programmable timer 27.

The control inputs 28.1 ... 28.N (where N is an integer) of processor 6 are connected to the control outputs of the second block 14 of the formation of control signals, and the signal outputs 29.1 ... 29.M (where M is an integer) to the inputs of the display unit 15. The first and second control outputs of the first control signal generating unit 13 are connected respectively to the first and second inputs of the first electronic switch 17, the third control output is connected to the input of the second monogram 21, the fourth control output to the first control input of the peak detector 23, the fifth control output — with the second control input of the peak detector 23; the sixth control output — with the control input of the third electronic switch 19, and the seventh control output — with the control input second electronic switch 18. The control of electronic switches 17. 18 and 19 is carried out by a signal log.

The first input of the first electronic switch 17 is connected to the output of the third signal generator 20, the second input to the output of the first single vibrator 5, the third input to the output of the second one-oscillator 21, and the output to the input of the fourth generator 22 of the measurement end and the enable input of the programmable timer 27 .

The first input of the second electronic switch 18 is connected to the output of the converter 24 for voltage, the second input to the output of the frequency divider 25, and the output to the synchronization input of the programmable timer 27.

The first input of the third electronic switch 19 under: is connected to the output of sensor 3 of the ignition signal (03), the second input - to the input of source 26

the reference signal, and the output to the input of the peak detector 23, the output of which is connected to the input of the voltage-to-frequency converter 24.

The control signal generation unit 14 comprises a key matrix 30, an addition logic 31, and a simulator 320

The horizons of the keypad 30 are connected respectively to the fixed contacts of the keys 33.1 ... 33.N and the inputs of the logic circuit 31, and also connected via resistors 34.1 ... 34.N to the first pole of the power source (not shown). The verticals of the key matrix 30 are connected to the corresponding closing contacts of the keys 33.1 ... 33.N and the other pole of the power source. The output of the logic circuit 31 is connected to the input of the one-shot 32. The output of the latter is the signal output of the control signal generation unit 14, and the horizons of the matrix 30 are connected respectively to the control outputs 28.1 ... 28.N. The number N characterizes the number of operating modes of the device and is equal to five.

The display unit 15 contains a decoder 35 and an indicator array 36 made on the LEDs 37. The number of LEDs is PxL, where P is the number of display elements (vertical matrix), L is the number of segments in the display element. The inputs of the decoder 35 are the inputs 29.1 ... 29.M of the display unit 15, where M is an integer. The information on the inputs 29.1 ... 29, M comes in binary code and is converted by the decoder into code P and code L.

The device operates in five modes: determining the number of cylinders, measuring the frequency of rotation of the crankshaft, measuring the angle of ahead of ignition, measuring the secondary voltage of the ignition coil on a spark plug and in self-monitoring mode. The mode of operation of the device is set using the key matrix 30 of the control signal generation unit 14 by pressing the corresponding key.

Consider the operation of the device in these modes.

1. The mode of determining the number of cylinders of the engine (see Fig. 1, 2). Pressing the key 33.1 in the block 14 of the formation of control signals through the logic circuit 31 starts one-shot

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Ratio 32 and exhibited control code n controlled outputs. I. one . . 28.N. With the arrival of the signal from the wind detector 32 per quarter, the output of the preamp is. No, the processor 6 reads from the control inputs 28.1 ... 28.N of the code rk of the cylinder number determination program, rewrites it from the permanent memory unit 11 to the main memory unit 12 and starts its execution. In this case, the signal outputs 29.1 ... 29.M are set to the signal indicator of the cylinder number determination mode, which is output to the LED array 36 of the display unit 15.

At the same time, processor 6 removes the interrupt mask from the first and second interrupt inputs and begins processing the incoming information from sensors 1 and 3 on these inputs. Suppose that the sensor 1 TDC receives impulses (see Fig. 2, a), intended in this case to start counting the number of cylinders, and from sensor 3 - impulses (see Fig. 2, b), characterizing the number of cylinders of a four-stroke engine . On the first impulse arriving from TDC sensor 1 through the first driver 2 (Fig. 2c), the processor 6 goes into the program processing mode and starts counting the number of pulses from sensor 3 through the second driver 4 (Fig. 2, d) until the next pulse arrives with sensor I PC With the arrival of this pulse, the processor 6 stops the pulse counting from the sensor 3 and performs calculations. Upon completion of the calculation, the result code is output from the signal outputs 29.1 ... 29.N to the display unit 15. The last codes from the inputs 29.1 ... 29.N are converted on the decoder 35 to the control codes of the LED indicator matrix 36: the seven-segment code L and the indicator selection code K. The following information is simultaneously displayed on the indicator matrix 36: the number of the selected measurement mode, the result the measurement and the number of the studied cylinder of the LAN (required when measuring the amplitude of the secondary voltage on the spark plugs of the cylinders).

2. The mode of measurement of the number of revolutions of the crankshaft (see Fig. 1, 2). Pressing one of the keys 33.1 ... 33.N (33.2) in block 14 of the formation of the control signals through the logic circuit 31 starts the one-shot 32 and

A control code is set at control outputs 28.1 ... 28.N (similar to the previous mode). With the arrival of the signal from monovar 32 on the fourth interrupt input of processor 6, the latter reads from the control inputs 28.1 ... 28.N the code of the engine speed measurement subroutine and rewrites it from the fixed memory block 11 to the main memory block 12. Then he starts to perform the rewritten subroutine, while the signal outputs 29.1 ... 29.M processor 6 sets the signaling code of the mode of measuring the number of revolutions of the shaft's knee and outputs it to the indicator matrix 36 of the display 15.

Simultaneously with setting the code, the processor 6 via the data and address bus 9 transfers the control code to the input of the control signal generation unit 13, intended for switching the signal from the third generator 20 to the output of the first electronic switch 17. The control signal generation unit 13 converts the received control code into a two-bit binary signal (01) and exposes it to the control inputs of the first electronic switch 17. The latter switches the signal from the output of the third Shaper 20 to the input of the fourth form ovatel 22 and to the input resolution of the programmable timer 27. The signal from the TDC sensor 1, will form in the first vanny generator 2 is supplied to the third driver 20, a time interval equal to the duration of one revolution of the crankshaft (see. Fig. 2a-d).

With the arrival of the resolution signal, equal in duration to the time of one revolution of the crankshaft (see Fig. 2, d). To the enable input of the programmable timer 27, the latter starts counting pulses arriving at its sync input via the circuit: generator 16, frequency divider 25, second electronic switch 18, which is in the initial state (output of frequency divider 25 is switched to the output of the second electronic switch 18) . At the end of the enable signal, the counting of the synchronization pulses in the programmable timer 27 is stopped, the fourth driver 22 generates a signal of a given front (see Fig. 2, m) arriving at the third

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interrupt input processor 6. Processor 6, according to the program, reads the number of synchronization pulses counted by programmable timer 27 per crankshaft through the bus 10 of data and addresses, and proceeds to calculate the number of revolutions of the crankshaft.

Upon completion of the calculation, the result is output from the signal outputs 29.1 ... 29.N to the display unit 15 (similar to the previous mode).

3. The mode of measurement of the angle of ignition advance (see Fig. 1.2). By pressing one of the keys 33.1 ... 33.N (33.3) in the control signal generation unit 14, the one-shot 32 and the control code at the control outputs 28.1 ... 28.N (similar to the previous modes) are started via logic circuit 31. With the arrival of the signal from the one-shot 32 on the fourth interrupt input of the processor 6, the latter reads from the control inputs 28.1 ... 28.N the code of the ignition angle measurement routine and rewrites it from the permanent memory unit 1 1 to the operational memory unit 12. Then, the ohm begins to execute the rewritten subroutine, while the signal outputs 29.1 ... 29. M processor 6 sets the signal code of the mode of measurement of the ignition advance angle, which is output, to the display unit 15.

Simultaneously with setting the code, the processor 6, via the data and address bus 9, transmits the control code to the input of the control signal generating unit 13 for switching the signal from the first one-shot 5 to the output of the first electronic switch 17.

The first control signal generating unit 13 converts the received control code into a two-bit binary signal 1 0 and exposes it to the control inputs of the first electronic switch 17. The latter switches the signal from the output of the first oscillator 5 to the input of the fourth driver 22 and the programmable timer enable input 27.

The signal from the TDC sensor 1, formed in the first driver 2, is fed to the trigger input of the first one-shot 5 (see Fig. 2, a-d, e). at the same time, the control of the last input through the second driver A is

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Steps signal from ignition signal sensor 1. On the first one-shot 5, a time interval is formed that is proportional to the ignition advance angle (resolution signal) (see Fig. 2, e). With the arrival of this signal from the first oscillator 5 to the enable input of the programmable timer 27, the latter starts counting pulses arriving at its synchronization input along the circuit: generator 16, frequency divider 25, second electronic switch 18 (electronic switch 18 is in the initial state). At the end of the enable signal, the counting of the synchronization pulses in the programmable timer 27 stops, and the timer 27 generates a trailing edge signal arriving at the interrupt input of the processor 6. Further operation of the device is similar to the operation when measuring the number of revolutions of the crankshaft. The ignition advance angle is calculated in processor 6.

4. Measurement mode of the amplitude of the secondary voltage of the ignition coil on the spark plug of the selected cylinder (see Fig. 1.2). By pressing one of the keys 33.1 ... 33oN (33.4) in the control signal generation unit 14, logic device 31 starts the one-oscillator 32 and sets the control code to the control outputs 28.1 ... 28.N (similar to the previous modes). ). With the arrival of the signal from the single-vibrator 32 on the fourth input of the processor 6, the latter reads from the control inputs 20.1 ... 28.N the code of the program for measuring the amplitude of the secondary voltage on each candle and rewrites the subroutine from the block 11 of the permanent memory into the block 12 RAM. Then he begins to perform the rewritten subroutine, while the signal outputs 29.1 ... 29.M processor 6 exposes the signal code of the measurement mode of the amplitude of the secondary voltage, which is displayed on the display unit 15

Simultaneously with the setting of the code, the processor 6 removes the interrupt mask from the first and second interrupt inputs and, via the data and address bus 9, transmits the control code to the input of the first 13 control signal generation unit. Unit 13 converts the incoming code into control signals of the first, second, and third electronic switches 17, 18, and 19.

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The control inputs of the first electronic switch 17 receive a stroke 11, as a result of which the signal from the output of the second one-oscillator 21 switches to the output of the first electronic switch 17. The control input of the second electronic switch 18 receives a signal log. 1, whereby the signal from the output of the voltage-to-frequency converter 24 is switched to the output of this switch. The third electronic switch 19 is in the initial state.

When the LAN is operating, the signal removed by the TDC sensor 1 through the first driver 2 is fed to the first interrupt input of processor 6, to the second interrupt input of which, through the second driver 4, the ignition signal from sensor 3 is received (see Fig. 2, a-d). At the same time, the signal from sensor 3 is fed to the input of peak detector 23. In this case, the signal from TDC sensor 1 is used to start counting the number of cylinders, and the signal from sensor 3 to count the number of cylinders of the engine, as well as to measure the amplitude of the secondary voltage on the candles LAS. At each pulse from the output of sensor 3, the processor 6, according to the subroutine, increases by one the number of the current cylinder, and upon the arrival of the pulse from sensor 1, TDC inserts it. In order to measure the amplitude value of the secondary voltage on any cylinder, it is necessary to set the number of the desired cylinder by pressing one of the keys 33.1 ... 33.N of the key matrix 30 of the control signal generating unit 14. At the same time, processor 6 reads the code of the key on, similar to the mode selection. With the arrival of the signal from the one-shot 32 to the fourth interrupt input, the processor 6 reads from the control inputs 28.1 ... 20.N the code of the selected cylinder number and writes it to the main memory unit 12, while the signal outputs 29.1 ... 29 M processor 6 exposes an additional alarm code of the selected cylinder number, which is displayed on display unit 15. The value of the selected cylinder number processor 6 decrements (decreases) by one and compares it with the current value of the program counter of the processor 6.

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When these values coincide, the processor 6 generates a code for the write signal to the peak detector 23 of the amplitude value of the secondary voltage on a given cylinder and exposes this code on the bus 9 of data and addresses for supplying control signals to the first block 13.

The next to the right output generates a signal log. 1 to allow the recording of the amplitude value of the secondary voltage to the peak detector 23 (see Fig. 2, g), after which the voltage-to-frequency converter 24 begins to work (see fig. And), generating pulse synchronization signals of the programmable timer 27 whose frequency is proportional to the magnitude of the amplitude value of the voltage recorded in the peak detector 23 (, 2, 3). With the arrival of the next pulse from the second generator 4, the processor 6 masks the first and second interrupt inputs} and also removes the write enable signal from the control input of the peak detector 23, thereby prohibiting the recording of a new signal value. Peak detector 23 continues to store the measured amplitude value of the secondary voltage in analog form until the arrival of the signal Reset to another control input. Then, on the data and address bus 9, the processor 6 sets up the startup code of the second one-shot 21 (allowing the programmable timer 27 to operate) to the first control signal generating unit 13, which starts it with the signal 1 from the third output (see Fig. 2, ). The signal from the output of the second one-shot 2 (see Fig. 2, l) via the first electronic switch 17 is switched to the input of the fourth driver 22 and to the enable input of the programmable timer 27. Shaper 22 generates a measurement end signal (see FIG. 2, m), a processor 6 interrupt arriving at the third input, which proceeds to reading the code of the measured value from the programmable timer 27 and proceeds to the calculation of the amplitude value of the secondary voltage on the selected cylinder. During the time of the on-state of the second single-vibrator 21, from the output of the voltage-frequency converter 24, the number of pulses will be recorded, equivalent to the amplitude value of the secondary at

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prints stored in the peak detector 23.

When one of the sensors 1 BMT or 3 is broken, the processor 6 stops and the measurement and calculation of the amplitude value of the secondary voltage is not performed.

5. The mode of self-control (see Fig.1 and 2).

To activate the self-control mode, it is necessary to press one of the keyboard (33.5) in the control signal generating unit 14. Further work is similar to that described in the amplitude measurement mode of the secondary voltage, with the exception that the subroutine self-control is called from the fixed memory block 11, and the self-control signaling code is set to the display unit 15.

Simultaneously with setting the code, the processor 6, via the data and address bus 9, transmits the control code to the input of the control signal generating unit 13. The latter converts the received code into control signals of the first, second, and third electronic switches 17, 18, and 19. The control inputs of the first electronic switch 17 receive code 11, which switches the signal from the output of the second one-oscillator 21 to the output of the first electronic switch 17. On The control inputs of the second and third electronic switches 18 and 19 receive a signal from log. 1, as a result of which the signals are switched: from the output of the voltage converter 24 to the frequency to the output of the second electronic switch 18 ; from the output of the source 26 of the reference signal to the output of the third electronic switch 19. Thus, instead of the sensor 3 in the self-monitoring mode, the source 26 of the reference signal is connected to the input of the peak detector 23, the output signal of which is used as a reference ignition signal. At each pulse from the output of the source 26 of the reference signal, the processor 6 increases by one the number of the current cylinder (according to the work subroutine, with the processor 6 being zeroed out according to the work subroutine to begin the reference).

To measure the amplitude of the reference signal, the processor 6 reads from the fixed memory unit 11

The integer number F 2, para. 1I, is analogous to the selected cylinder number (for the measurement mode of the impedance of the secondary impulse), entered from the second control signal generation unit 14. The value of the F number is processor 6 too short (reduces by the unit and compares with the current value of the program counter of the processor 6. Further operation of the claimed device in the self-control mode is similar to the one in the secondary voltage amplitude measurement mode. After the measurements and calculations are completed, the result 6 is compared with the second The number P is recorded in block 11 of the permanent memory. If these numbers are equal, the processor 6 exposes to the signal outputs 29.1 ... ... 29.M code which in block 15 of the conversion is converted to vivo Recording Goden1 otherwise be highlighted inscription Fail.

Thus, in the self-checking mode, the measurement and calculation paths of the claimed device are checked, which makes it possible to determine the cause in the event of a device failure. The self-monitoring mode is recommended to be included before each measurement.

Claims (1)

Invention Formula A device for monitoring parameters of an internal combustion engine comprising a top dead center sensor connected in series and a first signal conditioner, an ignition signal sensor connected in series, a second signal conditioner and a first one-oscillator, the triggering input of which is connected to the output of the first signal conditioner, processor, first and second interrupt inputs which are connected respectively to the outputs of the first and second signal conditioners, and the first, second and third inputs - respectively the first, second and third data buses and addresses, a block of permanent memory, a main memory unit and a first control signal generation unit, whose inputs are connected to the first, second and third data and address buses, respectively, the second control signal generation unit, control outputs of which 0 five 0 -one 5 Q 0 5 0 five  to uchr.egi. Processor processor, block NND1.K.P1NI, which mkhldy are connected to the processor; shy., t, processor, and the generator of t-acton pulses connected to the processor, characterized in that, in order to expand the functional capabilities by measuring the secondary voltage of the ignition coil in the circuit of each candle and increasing the reliability of control, the device additionally contains a timer, the input of which is connected to the fourth processor input via the fourth data bus and addresses, the first and second electronic switches, the third signal conditioner, the input of which is connected to the output of the first signal conditioner, and the output to the first input of the first electronic switch, the second input of which is connected to the output of the first one-oscillator a, the second one-shot, the output of which is connected to the third input of the first electronic switch, the fourth signal conditioner, the input of which is connected to the output of the first electronic switch and the programmable timer enable input, and the output to the third interrupt input of the processor, the fourth interrupt input of which is connected to the signal output the second control signal generating unit, connected in series by a third electronic switch, the first input of which is connected to the output of the ignition signal sensor , peak detector and voltage to frequency converter, the output of which is connected to the first input of the second electronic switch, the output of which is connected to the clock input of the programmable timer, the frequency divider, the input of which is connected to the output of the clock generator and clock inputs of the programmable timer and processor, and the output - to the second input of the second electronic switch, and the source of the reference signal, the output of which is connected to the second input of the third electronic switch, while in the first block Formation of the control signals, the first and second outputs are connected respectively to the first and second control inputs of the first electronic switch. the third output is connected to the input of the second one-shot, the fourth output to the first control input of the peak detector, the fifth output to the second control input of the peak detector, test output to the control input of the third electronic switch, and the seventh output to the control input second electronic switch. FIG. 2