SU1732164A1 - Liquid fuel flowmeter - Google Patents

Abstract

The invention relates to flow rate and allows to improve the measurement accuracy of liquid fuel flow meters. During engine operation, from the output of the 3 rpm sensor, the counting input of the first counting unit 1 receives impulses corresponding to the engine work cycles, and the fuel enters the cylinder and moves the piston. As fuel is consumed, the piston approaches the reed switch 10. The activation of the reed switch 10 triggers the solenoid valve unit 7, after which the fuel starts to flow from the cylinder 8 to the carburetor. When the reed switch 10 closes, the first counting unit 1 is nullified, and the digital clock of the display unit 5 displays the number of engine strokes for which a given amount of fuel was consumed. 4 il. i (L C -h s th 10 C5 Fig1

Description

The invention relates to mechanical engineering, in particular to a technique for measuring fuel consumption by an internal combustion engine (LAN), and can be used in diagnosing two.

An electronic fuel flow meter is known, the principle of which is based on converting the fuel speed to the rotational speed of the single-bearing HQU sensor spinner, which in turn is converted into an electrical AC signal at a frequency proportional to the rotation frequency of the spinner through a magnetic induction generator. The electronic unit converts the electrical output of the sensor into digital information of instantaneous volumetric fuel consumption,

The disadvantage of this flow meter is an increase in measurement error with a decrease in the flow rate of the fuel at idle. The closest to the invention to the technical essence is a liquid fuel flow meter that contains a booster pump with a speed sensor and a drive engine, hourly and total toppiva flow counting blocks, a piston with a magnetized ring and a magnetic reed switch (magnetic-sensitive devices) located on the outside a cylinder connected by an electrical circuit through a control relay to the pumping pump drive motor, the cylinder from the side of the working cavity of the hydraulic It is connected to the fuel consumer and the booster pump, and the pump speed sensor is electrically connected to the hourly flow counting unit.

During operation, the fuel from the pump enters the consumer and under the bottom of the piston with a magnet, which compresses the spring, approaches the upper reed switch. As soon as the piston with the magnet takes a position opposite the reed switch, its closed contacts turn off the electric motor and the piston through the relay, pushing the fuel to the consumer and the pump, returns to its original position. As a result, all of the fuel except for the known leaks in the pump is supplied to the consumer.

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During the operation of a known flow meter, an inevitable change in the Physical properties and, consequently, of the technical parameters of the spring occurs, which in turn leads to a decrease in the accuracy of the measurement of fuel consumption.

The purpose of the invention is to increase the measurement of the flow rate of the liquid fuel two.

This goal is achieved by the fact that in a liquid fuel meter containing a magnetically permeable cylinder with a piston placed inside it with a magnet and the first and second magnetically sensitive elements located on the outer side of the cylinder, the first and second counting blocks, the indicator unit and the speed sensor connected The memory register connected between the outputs of the first account block and the first group of inputs of the display unit, a solenoid valve block connected to both cylinder outputs, entered to the input of the first counting unit. and hydraulically connected to the inlet and outlet of the flow meter, respectively, through the first and second shut-off valves, a trigger connected to the first and second inputs, respectively, to the inputs of the first and second magnetosensitive elements, and the first and second outputs connected to the corresponding control inputs an electromagnetically controlled solenoid valve of the block; the output of the first magnetically sensitive element is connected to the zero input of the first counting block, the memory register register entry and counting input 4 of the second counting block connected to the output and a second group of inputs of the indication unit.

The proposed liquid fuel flow meter for LBW provides, due to the electromagnetic valves, the reciprocating movement of the piston with the magnet along the cylinder under the pressure of the inflowing fuel, which makes it possible to improve with the help of electronic units the accuracy of the measurement of fuel consumption in the internal combustion engine.

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Lig.1 shows a flowchart for Lig. 2 shows a housing structure with solenoid valves, in FIG. 3 a section A-A in FIG., In FIG. K a section B-B in FIG. 2.

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The liquid fuel meter for the internal combustion engine contains the first and second blocks 1 and 2, the turn sensor 3 connected to the counting input of the first counting unit 1, the memory register, the display unit S, the first group of inputs of which is connected through the memory register A to the outputs of the first block 1 bills RS-flip-flop 6, electromagnet p valve block 7 housing 8, magnetically sensitive elements made in the form of reed switches 9 and 10 placed in channel 11. Case 8 has a magnetic permeable cylinder 12 in which a piston 13 with two magnets is placed 1. As magnets when comparing but larger sizes piston recommended set magnetised ring for small - plate magnetized cylindrical shape.

The outputs of the first and second switches 9 and 10 are connected respectively to the first and second inputs of the RS flip-flop 6, the first and second outputs of which are connected to the first and second inputs of the solenoid valve block 7, respectively. channels are hydraulically connected to the fuel consumer and a pump (not shown) through the locking bodies 21 of the solenoid valve block 7; The output of the reed switch 9 is connected to the zero input of the first counting block 1, the register A memory entry and the counting the input of the second unit 2 of the account connected by outputs with the second group of inputs of the display unit. The housing 8 of the flow meter is made of aluminum alloy Al2. An inlet pipe 22 and an outlet pipe 23 are provided to connect the flow meter to the fuel line. A generator sensor 2 is used as the 3 rpm sensor.

The solenoid valve unit 7 has four windings 24-27 connected in pairs 24 and 26, 25 and 27. Therefore, one of the pairs depends on the voltage of the RS-flip-flop 6 (25 and 27). Before starting the engine, the fuel line is filled with fuel. During the operation of the engine, from the output of the 3 rpm sensor, pulses are received at the counting input of the first block 1 of the counting unit, which correspond to the working cycles of the engine, and the fuel through the inlet pipe 22, connecting 6

The fuel channels 15-17 enter the cylinder 12 and move the piston 13, which displaces fuel from the cylinder 12 through the connecting channels 19 and 20 and the outlet 23 into the carburetor. As fuel consumption, the piston 13 approaches the reed switch 10. At some point, the reed switch 10 under

the magnetic field of the magnets 1 switches, changing the state of the RS flip-flop 6, and the windings are energized and 26. As a result, the locking bodies 21 close the fuel output from the connecting channel 16 and open the connecting channel 18, and the fuel starts to flow into the cylinder 8 through pipe 22, connecting channels 15, 12, 19, and

from cylinder 8 to the carburetor through the connecting channels 17, 20 and the outlet 23. At the appropriate moment, the reed switch 9 switches, the solenoid valve unit 7 is activated and the cycle repeats. At the same time, the voltage pulse from the output of the reed switch 9 is fed to the zeroing input of the first block 1 of the account, the input of the register 4 memory and the counting input

the second block of account 2. This pulse records information at the outputs of memory register 4 and sets the account block 1 to its initial state. As a result, the digital displays of the display unit 5 reflect the number of engine strokes for which a given amount of fuel and current fuel consumption for a controlled period of time have been spent.

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Claims (1)

Invention Formula five A liquid fuel flow meter containing a magnetically permeable cylinder with a piston with a magnet inside it and first and second magnetically sensitive devices located on the outside of the cylinder, the first and second counting blocks, the display unit and the speed sensor connected to the input of the first counting block, characterized in that In order to improve the accuracy of fuel consumption measurement, a memory register is inserted in it, connected between the outputs of the first counting unit and the first group of indication blocks, the elec- trotroma valve device connected to both outlets ; one pa and hydraulically connected with the fuel consumer and the pump, respectively, through the first and second shut-off valves, and the trigger connected by the first and second inputs, respectively, to the outputs of the first and second magnetosensitive devices, and the first and second outputs connected to the corresponding control inputs 7321648 the electromagnetic valve device, the output of the first magnetically sensitive device, the tel device is connected to the zero input of the first counting unit, the memory register recording entry and the counting input of the second counting unit connected to the second group of inputs of the display unit. Aa 17 21 In //////////// // ////. well BUT ЈЖ w /// ///// y / t  / // / 57/7 // A 27 12 21 /// well  /// LUAYUYA. B $ SHU0777 /, 13 6-6 . 311 10 Ш V //// V /// Y / 777 / y // Y /////// A uh with //////////////// 7 // (///// 7 ////////// Rig 4 / Y /////// A 3 with