SU1719939A2 - Device for monitoring engine operation modes - Google Patents

Abstract

This invention relates to a measurement technique for measuring parameters of internal combustion engines. The device contains a generator 1. a control unit 2, a stroke sensor of a high-pressure fuel pump rail 3, a crankshaft speed sensor 4, peak detectors 5, 6 and 14, 15, averages calculating units 7 and 16, a standard deviation computing blocks 8 and 17 , blocks for calculating relative values 9 and 18. comparators 10 and 19, element 2 OR 11, element 2 and 12, block of counters 13, elements NOT 20 and 21, element 3 and 22, memory block 28, pulse shapers 29 and 30, adder 31, divider 32, comparators blocks 23. 25 and 33, blocks of keys 24, 26 and 34 and matrix The second block of counters is 27. Increasing the information content is ensured by the fact that the device allows one to fix unsteady modes over acceleration ranges, which allows one to choose optimal driving modes and increase fuel efficiency. 1 il. ate with o yu SA) yu

Description

The invention relates to a measuring technique and can be used to measure the parameters of internal combustion engines during tests of automotive and other equipment,

A device is known that permits the registration of separately installed and unsteady engine operation modes. It contains a generator, a control unit, a stroke sensor for a high-pressure fuel pump (HPFD), an engine crankshaft speed sensor, peak detectors, averaging units, comparators, logic elements, an unsteady time counter, and a matrix meter block.

A disadvantage of this device is the low information content of fixing modes due to the impossibility of classifying unsteady modes by the magnitude of the acceleration. At the same time, such a division is extremely important, for example, when solving problems of economical driving.

The purpose of the invention is to increase the information content of registration of undetected engine operation modes.

This goal is achieved by adding two pulse generators, a third comparators block, a third key block, a memory block, an adder and a divider, and a running time counter to the device. the unsteady modes are designed as counters, while the output of element 2 is connected to the counter. during unsteady mode, through the control input of the third key block, whose inputs through the third comparator block are connected to the output of the divider, the first input of which is connected to the output of the adder, the first the input of which is connected to the input of the first block of comparators and the information input of the block of memory, the output of which is connected to the second input of the adder, the control input of which is connected to the output of the first Pulses, the input of which is connected to the second input of the divider, to the output of the control unit and through the second pulse shaper to the control input of the memory unit.

The drawing shows a block diagram of the device.

The device consists of a generator 1, the output of which is connected to the control unit 2, the sensor 3 of the pump rail stroke, sensor 4 of the engine crankshaft rotation speed, the first peak detector 5. of the second peak detector 6 connected at the input

schemes —from the first average value calculating unit 7, the first standard deviation calculating unit 8 and the first relative calculating unit 9, the output of which is connected through the first comparator 10, element 2 OR 11c element 2 AND 12; block 13 of engine time counters in unsteady modes, circuits from the third peak detector 14, the fourth peak detector 15. the second average value calculator 16, the second standard deviation calculator 17, the second relative value calculator 18 and

5 second comparator 19; the first element is NOT 20 and the second element is NOT 21, connected to the inputs of element 3 and 22; two successive circuits, respectively, from the first block of 23 comparators, the first

0 a block of 24 keys and a second block of 25 comparators, a second block of 26 keys; matrix block counters 27; a circuit that calculates the average acceleration of the engine crankshaft and includes a block 28

5, a first pulse shaper 29, a second pulse shaper 30, an adder 31 and a divider 32, the output of which is connected to the third comparators unit 33, the third key block 34.

0 The device operates as follows.

The signal from the stroke sensor 3 of the pump rail pump enters the peak detectors 5 and 6, which respectively store the maximum and minimum parameter values for a fixed period of time; specified by control unit 2. The signals from the peak detectors 5 and 6 are fed to the average value calculation unit 7,

0 which calculates the mean stroke of the pump rail. From the output of block 7, a signal proportional to the average value of the parameter is applied to the input of block 8, to the second input of which a signal is sent from the peak

5 detector 5, proportional to the maximum value of the parameter. Block 8 calculates the standard deviation of the rail stroke in a fixed period of time. The signals from the outputs of blocks 7 and 8

0 is fed to the input of block 9, which calculates the ratio of the standard deviation to the average value of the parameter. From the output of block 9, a signal is applied to the input of the comparator 10, to the installation input of which a constant voltage is applied. proportional to a relative value of 2%. Thus, the comparator 10 is triggered when the ratio of the standard deviation to the average value of the parameter is more than 2%. Channel

calculating the parameters for the crankshaft rotational speed of the engine works in a similar way.

When at least one of the Comparators 10 or 19 is triggered, which corresponds to unsteady engine operation, element 2 OR 11 is given a signal to input element 2 AND 12 to a second input of which, at the end of each fixed time interval, the signal from control unit 2 is supplied; in the presence of signals at both inputs of element 2. And 12, a signal appears at its output, which arrives at the control input of the third key block 34 and turns it on during unsteady mode.

At the same time, the signal from the average calculation unit 16 is fed to the information input of the memory unit 28. At the time of arrival of the pulse from the control unit 2, the first pulse shaper 29 starts the adder 31. From the rear of the signal from the control unit 2, the second pulse shaper 30 produces a signal to the control input of the memory unit 28, which is used to store the new value of the average value. Thus, at the output of the memory unit 28, there is a voltage proportional to the average value of the crankshaft rotation frequency in the previous period and. at the time of the operation of the first imager 29 pulses. The subtractive inputs of the adder 31 receive a voltage proportional to the average frequency of rotation of the crankshaft during the previous cycle and the same voltage during the current cycle.

A signal from the adder 31, proportional to the difference in rotational frequency of the crankshaft for the current and previous fixed periods of time, is fed to the first, input divider 32, to the second input of which a signal is proportional to the length of the fixed time period specified by the block. 2 controls

From the output of divider 32 to the third comparator unit 33, a signal is given that is proportional to the average angular acceleration of the engine crankshaft for a fixed period of time. From the corresponding output of the comparator block 33, the signal is fed through the corresponding channel of the third key block 34, provided that the control input signal from element 2 and 12 is on the block 13 of the counters, recording the engine running time in unsteady mode with certain crankshaft accelerations.

From the outputs of blocks 7 and 16 of the average calculation, the signal is fed to the inputs of blocks 23. and 25 comparators, which classify the parameter according to certain ranges. With the corresponding outputs of blocks 23 and 25 comparators

The signal is fed through the corresponding channels of the blocks 24 and 26 of the keys to the matrix block 27 of the counters, at the intersection of the column and row of which the corresponding counter is triggered, recording the running time.

engine on this speed and load steady state.

The key blocks 24 and 26 are controlled as follows.

When the engine is running at steady state, at the outputs of the comparators 10 and

19 no signal. Accordingly, there are no signals at the inputs of the elements.

20 and 21, In this case, the outputs of these elements receive a signal at the inputs of element 3 and 22.

If there is a signal at two inputs of element 3 And 22 and a signal from control unit 2 at the end of each fixed period of time at the third input of element 3 And 22, a signal is sent from its output to the control inputs of blocks 24 and 26 of the keys.

The proposed device makes it possible to increase the information content of registration of non-established engine operating modes over acceleration ranges by 10-15%, which

gives you the opportunity to choose the optimal modes of car movement and increase fuel efficiency by 3-5%.

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Claims (1)

Invention Formula A device for registering engine operating modes according to the author. St. No. 1420396, which is due to the fact that, in order to increase the information content, two pulse formers, a third comparators block, a third key block, a memory block, an adder and a divider, were additionally introduced, and the time counter for unspecified modes was made type of meter block, 5 while the output of element 2 and is connected to a time counter in unsteady mode via the control input of the third key block, the inputs of which through the third block of comparators are connected to the output of the divider whose first input is connected to the output of the adder, the first input of which is connected to the input of the first comparators block and to the information input of the memory block whose output is connected to the second input 5 of the adder, the control input of which is connected to the output of the first pulse driver, the input of which is connected to the second one. the input of the divider, to the output of the control unit and through the second pulse shaper - to the control input of the block;: memory.