SU1765736A1 - Device for internal combustion engine loading - Google Patents

Abstract

The invention can be used in the engine-building industry and allows extending the measurement range of the internal combustion engine (ICE) load to the maximum torque mode. ICE loading in modes from idling to nominal mode is measured by the position of the fuel pump rail, equipped with a contact sensor. At the same time, the frequency signal arising from the contact of the fuel supply limiter and the stop is converted into an analog signal by means of the integrator 6. At loads, the crankshaft speed is measured above the rated frequency by sensor 2, which uniquely detects load 1 or less

Description

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The invention relates to mechanical engineering, in particular to engine-building, namely to devices for automatically controlling the loading of internal combustion engines,

A device for monitoring engine loading is known, which contains a rotational speed regulator, equipped with a fuel supply limiter, and a load indicator connected to a power source through a position sensor of the fuel pump rail. The position sensor of the fuel pump rail is made in the form of two contacts, the first of which is mounted on the rail and connected to the negative pole of the power source, and the second one is installed on the fuel supply limiter, is isolated from the regulator housing by means of a dielectric gasket and is connected to the positive pole of the source nutrition 1.

The closest solution adopted for the prototype is an engine load monitoring device containing a contact sensor for the rail pump position, a crankshaft speed sensor, a crankshaft angular acceleration measurement unit, an electronic switch and an integrator, the output of the fuel pump rail sensor output the electronic key information input, the crankshaft angular acceleration measurement unit is connected to the electronic key control input, the electronic key output is connected to and integrator, and the signal from the output of the integrator is fed to the recording device.

A disadvantage of the known solutions is that the engine load can be measured only to such a value that the contacts of the sensor for the position of the rail of the fuel pump become permanently closed, which corresponds to the beginning of the correcting branch of the characteristic. At higher values of the engine load, the signal level at the integrator output does not change, since the time of the closed contact state does not change.

The aim of the invention is to extend the load measurement range to the maximum torque mode.

This goal is achieved by the fact that the device is equipped with a fuel pump rail position sensor, crankshaft rotation speed sensor, crankshaft angular acceleration measurement unit, two electronic keys, an integrator, a comparison unit, a reference voltage source, a frequency-analog converter, a functional converter and a recording by instrument

moreover, the rail pump position sensor is connected via the first electronic switch to the integrator, the crankshaft rotation frequency sensor is connected simultaneously to the angular acceleration measurement unit and through the second electronic switch to the frequency converter analogue, the output of which is connected to the functional converter; The control inputs of the first and second electronic switches are connected respectively to the outputs of the angular acceleration measurement unit and the comparator unit, the output of the integrator is connected to one input of the comparison block, and the second source has a reference voltage, and in addition, the outputs of the first electronic key, integrator and functional The converter is connected to a recording device.

Figure 1 is a diagram of the inventive engine load control device; 2a, b, c is a graphic representation of the output signals of the device at various values of engine load.

The device contains a contact sensor 1 of the position of the fuel pump rail, which is made in the form of two contacts, the first of which is connected to the fuel supply limiter, and the second with its stop, crankshaft speed sensor 2, which is connected simultaneously to the angular acceleration measurement unit 3 the shaft and the information input of the second electronic key 4; The first electronic switch 5 connected between the sensor 1 of the rail pump position and the integrator 6, and the output of the crankshaft angular acceleration measurement unit 3 is connected to its control input. In addition, the device is equipped with a comparison unit 7, to the outputs of which the source 8 of the reference voltage and the output of the integrator 6 are connected. The output of the comparison unit 7 is connected to the control input of the second electronic switch 4, the output of which is connected through the converter 9 with the registering device 11. The outputs of the first electronic key 5 and the integrator 6 are also connected to the recording device 11.

The engine load control device works as follows.

When the engine is at idling and partial loads, the contacts of the sensor 1 of the rail pump position are constantly open and there is no signal at the sensor output. As the engine load increases, the fuel flow limiter begins to reach the stop, i.e. The contacts of the sensor 1 for the position of the rail of the fuel pump begin to close and open with a certain frequency. The signal from the contact sensor 1 is fed to the input of the first electronic key 5. At the same time, a signal from the crankshaft angular acceleration measurement unit 3 is supplied to its control input. If the angular acceleration is positive, which corresponds to engine acceleration, the first electronic switch 5 closes and the signal from the contact sensor 1 does not pass, which eliminates a false signal about the amount of engine loading in transient conditions. If the angular acceleration of the crankshaft is equal to or less than zero, then a signal appears at the output of the first electronic switch 5, which corresponds to the closure and opening of the contacts of sensor 1 with a certain frequency and indicating that a certain load level (Nenp) has been reached. The output signal from the first electronic key 5 blocks the control input, whereby the output signal is maintained until the contacts of sensor 1 are opened, regardless of the angular acceleration of the crankshaft. At the same time, the output signal from the first electronic key 5 is fed to the input of the integrator 6, and an analog electric signal appears at its output, proportional to the time of the closed state of the contacts of the sensor 1, and consequently, the engine load level. By increasing the engine load to about 110% of the nominal value, the contacts of the sensor 1 become permanently closed and further measurement of the load by means of the integrator 6 becomes impossible. Therefore, the output signal of the integrator 6 is fed to the input of the comparator unit 7, where its value is compared with the magnitude of the signal from the source 8 of the reference voltage. As soon as the signal from the integrator 6 exceeds the signal from the source 8 of the reference voltage (this corresponds to the achievement of the nominal engine load and the inflection point of the regulating characteristic), the second electronic switch 4 is opened and the signal from the crankshaft speed sensor 2 is fed to the converter 9 is an analogue where it is converted to an analog signal. Further, on the basis of the known function (n), by means of the functional converter 10, this signal is converted into a signal proportional to the engine load on the correction section of the characteristic. The output signals from the first electronic key 5, the integrator 6 and the functional Converter 10 is supplied to the recording device 11.

On figa shown that when loading

motor i with a value of Nenp, which is approximately 70 ... 75% of the nominal value and corresponds to the beginning of the contact closure of the sensor 1 of the fuel rail position

the pump, the signal at the output of the first electronic switch 5 jumps from zero to a certain value. In the region from Nenp to the nominal value, the output signal increases in proportion to

the time of the closed state of the contacts of the sensor 1 of the rail pump position (Fig. 2b). When the engine is loaded with a higher nominal value, the output signal depends on the rotational speed of the crankshaft, which determines the degree of loading (Fig. 2c).

Thus, the proposed device allows the load measurement range to be expanded to the maximum

torsional moment.

Claims (1)

Apparatus of the Invention A device for controlling the loading of an internal combustion engine, comprising A fuel pump rail position sensor, crankshaft rotation sensor, connected to the crankshaft angular acceleration measurement unit, the output of which is connected to the control input of the first electronic switch connected to the recording device, characterized in that in order to extend the load measurement range to maximum torque, it is additionally equipped with a second electronic key, a comparison unit, a reference voltage source, a frequency converter - analogue, a functional switch transformer and integrator, and the sensor the position of the fuel pump rail through the first electronic key is connected to the integrator, the crankshaft rotation frequency sensor through the second electronic key is connected to the converter frequency analog, the output of which is connected to the functional converter, to the control input of the second electronic key is connected to the output of the comparator unit to one block input Comparison connected output the integrator, and to the second - the source of the reference voltage, while the outputs of the integrator and the functional converter are connected to a recording device. / L jS Jf .: four Si $