SU1537882A1 - Device for simulating operation of ic-engine - Google Patents

Abstract

The aim of the invention is to expand the functionality of the device for simulating the operation of an internal combustion engine and to increase the stabilization of simulated processes when testing diagnostic equipment used to monitor the technical condition of engines. The goal is achieved due to the fact that in the device containing the generator of anode frequency pulses associated with the driver of 2 pulses, pushbutton switch 4, the frequency divider 5 with controlled pressure, summing counter 6, the second driver of 3 pulses, divider 7 frequencies with a fixed division factor, a reversible counter 8, a counting trigger 9, a state trigger 10, a persistent storage 11, a digital-to-analog converter 12, a decoder 13, and a display unit 14. The device allows It does not simulate the processes of acceleration and overrun of the engine according to their time and amplitude characteristics, as well as the imitation of other amplitude-time parameters, such as the maximum injection division, the rate of increase in injection pressure, advance advance angles and fuel injection duration. 1 il.

Description

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The invention relates to mechanical engineering, in particular to engine building, namely to instrumentation equipment, and is intended to simulate the amplitude-time processes of an internal combustion engine when testing relevant diagnostic equipment. The purpose of the invention is to expand the functionality of such a device and to improve the accuracy and time stabilization of simulated processes.

The drawing shows a functional diagram of the device.

The device contains a generator of 1 pulses of the reference frequency, the formers of 2 and 3 pulses, a pushbutton switch 4, a frequency divider 5 with a controlled division factor, a summing counter 6, a frequency divider 7 with a fixed division factor, a reversible counter 8, a counting trigger 9, a trigger 10 states, read-only memory 11 (ROM), digital-to-analog converter 12 (D / A converter), decoder 13, display unit 14.

The pulse generator 1 is connected to a serially connected frequency divider 5 with a controlled division factor, summing counter 6, ROM 11 and DAC 12, as well as a frequency divider 7 with a fixed division factor, the output of which is connected to the counting input of the reversible counter 8, information output the latter is connected to the control input of the divider 5. The second output of the counter 6 is connected to the input of the driver 2 pulses Series-connected switch 4 and the counting trigger 9 are connected to the inputs of the reversing counter 8, f The actuator has 3 pulses and a decoder 13, another input of the deflector 13 is connected to the output of the state trigger 10, the first input of the latter is connected to the output of the forming unit 3. The second input is connected to the overflow output of the counter 8, and the output is also connected to the enable input of the counter 8. The outputs of the decoder are connected to the inputs of the display unit 14.

The device makes it possible to simulate the amplitude-time working processes of an internal combustion engine, repeated from cycle to cycle, thereby ensuring testing of the corresponding

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measuring devices. In particular, the device allows the engine to accelerate and coast down.

The device works as follows.

In the normal state, trigger 10 is reset, thereby blocking the operation of counter 8. Depending on the state of trigger 9, the device is in one of its two stable states: either Minimum idle speed or Maximum idle speed, as evidenced by the glow of one of the four display elements of the block 14. An analog signal corresponding to the mode of operation is generated at the output of the DL.

If the initial state corresponds to the minimum engine speed of the simulated engine, the effect of the push-button switch 4 indicates the start of the engine acceleration mode. The trigger 9 changes its state to the opposite, causing the trigger 3 to be triggered, a single pulse from the output of which triggers trigger 10, which enables the operation of counter 8. The latter in this case works as a subtractor of pulses from the divider 7. This causes a decrease in the divider division ratio 5 and provides a gradual increase in the frequency of the signals taken from the output buses and the device, with a speed determined by the pulse frequency from the output of the divider 7. In this case, the device simulates The process of free acceleration of the engine, as evidenced by the glow of the corresponding display element Acceleration. The counter 8 subtracts the counting pulses until the overflow signal from the corresponding output of the counter 8 resets the trigger 10, thereby prohibiting the operation of the counter 8. This state of the device corresponds to the maximum rpm of the simulated engine and is confirmed by the corresponding display element luminous. . During the subsequent action on the push-button switch 4, the trigger 9 changes its state to the opposite, causing the trigger 3 to be triggered, a single pulse from the output of which cocks the trigger 10, which allows

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counter 8 bots. However, counter 8 in this case works as an adder of pulses coming from divider 7. This increases the division ratio of divider 5 and ensures a gradual decrease in the frequency of signals taken from the output buses of the device. In this case, the device simulates the engine run-on process, as evidenced by the glow of the corresponding display element Run-in. Counter 8 performs summation of the counting pulses until the overflow signal from the corresponding counter output resets trigger 10, thereby prohibiting the operation of counter 8. This device state corresponds to the minimum rpm of the simulated engine and is confirmed by the corresponding display element luminescent. move.

Thus, successive pressing of switching element 4 causes imitation of acceleration / expres- sion motor cycles, whose temporal and amplitude characteristics due to the use of digital technology (quartz pulse generator) have high stability from cycle to cycle, ensuring sufficient accuracy of calibration diagnostic instruments measuring various amplitude-time processes of a diagnosed internal combustion engine, such as maximum pressure, for example. injection, injection pressure buildup rate, area under the injection curve, feed advance angles and fuel injection duration, rotational speed of the diesel engine crankshaft.

Claims (1)

Invention Formula Device for simulating the operation of an internal combustion engine, with 0 holding a reference frequency pulse generator associated with a pulse shaper, a pushbutton switch, characterized in that, in order to enhance the functionality and improve operation stability, it further comprises a serially connected frequency divider with a controlled division factor and a summing counter, connected pulse generator and the first pulse shaper, the second pulse shaper, frequency divider with a fixed division factor, reversible pulse counter owls, counting trigger, state trigger, persistent storage, digital-to-analog converter, decoder, and indication unit the output of the pulse generator is connected to the frequency inputs of the frequency dividers, the divider frequency control input with the controlled division factor is connected to the information output of the reversible counter, the counting input of which is connected to the output of the frequency divider with a fixed division factor, the information output of the sum counter connected to series-connected permanent memory and digital-analogue converter, a push-button switch is located at the input of the counting trigger Era, exit which is connected to the control input of the reversible counter, with the second pulse shaper and one of the inputs of the decoder, the other input of which is connected to the output of the state trigger, the first input of the latter is connected to the output of the second pulse shaper, the second input - to the overflow output of the reverse counter, and the output is also connected to the enable input of the reversible counter, while the outputs of the decoder are connected to the inputs of the display unit.