SU1452496A3 - Device for diagnostics of diesel engine - Google Patents

Abstract

The invention relates to the field of operation of diesel engines and allows you to expand the functionality of the device. Pressure sensor 1 and quantizing flow meter 2 are installed in the rupture of the fuel line 3 from the high pressure pump to the nozzle. The outputs of the flow meter 2 are connected to two inputs of the reversible counter 4, the output of which is connected to the input of a digital-to-analog converter 5, connected to the indicator input 6. To the first output of sensor 1, the input of the rectifier 7 is connected, two outputs are connected to the indicator 8, the first input of the adder 10 and the first input 9 of the oscilloscope. The second output of sensor 1 through the salting filter 11 is connected to the second input of the adder § CO with

Description

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10, the output of which is related to the rectifier 15 and the first input of the comparator

16, with the second input of which the output of the rectifier 15 is connected. To the third input of the counter 4 there is connected the first output of the counter of 12 cycles, and with the second output of which the sensor 13 of the rotational speed of the crankshaft of the diesel engine and the third indicator 14 are connected. comparator 16 is connected in series with delay circuit 17, sawtooth generator 18, modulator 19 and w1

The invention relates to the operation of diesel engines and can be used to diagnose their high pressure fuel injection system.

The drawing shows the block diagram of the device.

The device contains a sensor. 1 pressure, quantizing flow meter 2, installed in the ruptures of the fuel line 3 from the high pressure pump to the injector, reversible counter 4, the first, second and second inputs of which are connected to the outputs of the flow meter 2, digital-to-analog converter 5 and the second indicator 6, connected in series - to the output of the reversible counter 4. The first input of the first sensor 7 is connected to the first output of the pressure sensor 1, the first and second outputs of which are connected to the first indicator 8 and the first input 9 of the oscilloscope, in addition to the first output of the oscilloscope. The receiver 7 is connected to the first input of the adder 10, the second output is connected to the second input of the last; The first pressure of the counter 12 is connected to the third input of the reversing counter 4, the second output of which is connected in series with the diesel crankshaft speed sensor 13 and the third indicator 14, the second output is connected to the output of the adder 10 The driver 15 and the first input of the comparator 16, with the output of the second higher - goal 14 connected to the second input of KOiMnapaTopa 16, and to the output of the last

A swarm input 20 of the oscilloscope, and another output of the generator 18 is connected to the third input of the 21. oscilloscope. The outputs of the comparator 16, the circuit 17 and the second output of the generator 18 are configured to be connected to the input of the counter 12 cycles. Ustr-7vo provides simultaneous measurement of the fuel cycle, the fuel injection pressure of the crankshaft rotation frequency, the number of pulses of a given pressure and the pressure waveform in the fuel line. 1 il.

connecting in series the delay circuit 17, the sawtooth voltage generator 18, the modulator 19 and the second input 20 of the oscilloscope, and the other output of the sawtooth generator is connected to the third input 21 of the oscilloscope. The outputs of the comparator, the delay circuit and the second output of the sawtooth generator are made with the ability to connect 12 clock cycles to the input of the counter.

The device works as follows.

From the quantizing flow meter 2, the reversible counter 4 receives impulses corresponding to the forward and backward waves in the fuel line 3, the beginning and end of the reference are set using a counter signal 12 clocks Hai counter input 12 clocks receive signals from the outputs of the comparator 16 or delay circuit 17 or sawtooth generator 18. The pulses from the output of the clock counter are recorded by the crankshaft speed sensor 13 and are recorded with the third indicator 14,

The signal from counter 4 via the digital-to-analog converter 5 is recorded by the second indicator 6, the maximum pressure in the fuel line is recorded by the sensor 1 of the pressure, and as an electrical signal from its first output, goes through the first controller 7 to the first indicator 8.

The horizontal oscilloscope amplifier converts the co-output signals of the 7th mitele 7, the vertical oscilloscope amplifier converts the signal from the output of the sawtooth generator, which receives the trigger signal from the output of the delay circuit 17 and varies with time.

The adder 10 adds the signals corresponding to the maximum values of pressure and the average value obtained from the sensors 7 and the band-pass filter 11. The comparator 16 generates a sync pulse using the signals from the adder and the meters 15.

Thus, using the device, fuel delivery cycle, fuel injection pressure, diesel engine crankshaft rotation speed, number of pulses of a given pressure, and pressure waveform in the fuel line can be measured simultaneously.

Claims (1)

Invention Formula A device for diagnosing a diesel engine, including electrically connected pressure and rotation frequency sensors of the crankshaft, a first counter, a filter, an adder, a first indicator, the pressure sensor being installed in the fuel line, characterized in that the device comprises series-connected quantizing flow meter, reverse account l U52496 a digital converter and a second indicator, as well as a third indicator, a clock counter, a second rectifier, a comparator, a delay circuit, a sawtooth generator, a modulator and an oscilloscope, the quantizing flow meter is installed in the fuel line, the outputs 10 of the flow meter are connected to the first and second the inputs of the reversible counter, the first output of the clock counter is connected to the third input of the last, the second output of which is connected 15 to the input of the rotational speed sensor, the output of the latter is connected to the third indicator The first and third indicators are sequentially connected to the first input of the pressure sensor 20, the first output of the rectifier also connected to the first input of the adder, and the second to the first. The oscilloscope input, the second output of the pressure sensor is connected through a filter 25 to the second input of the adder, the output of which is connected to the inputs of the second rectifier and comparator, the output of the second meter is connected to the second input of the comparator, and the output of the last 0 is connected to the input of the delay circuit, the output which is connected to the input of the sawtooth generator, the first output of which is connected to the second input of the oscilloscope, and the second to the third input of the oscilloscope through the modulator, and the input of the clock counter is completed with the possibility of: Connecting either the comparator outputs and the delay circuit, or to the Q output of the first sawtooth generator.