RU2274835C2 - Device for measuring fuel discharges of internal combustion engine - Google Patents

Abstract

FIELD: measurement technology.

SUBSTANCE: device can be used when diagnosing Diesel engine during exploitation. Device has two leak-proof discharge tanks with level capacitive detector mounted in any tank. First discharge tank is connected with low pressure fuel pump through lock rectifier at input of the tank and fine filter. First discharge tank is connected to high pressure fuel pump of engine fuel supply system. Second discharge tank, provided with lock rectifier mounted at its output, is connected with high pressure fuel pump for receiving excess fuel getting back to the tank. Any level detector is connected with registrar through differentiator.

EFFECT: improved precision of measurement.

1 dwg

Description

The invention relates to the field of measuring equipment and can be used to measure fuel consumption by a diesel internal combustion engine during diagnosis during operation.

A device for measuring fuel consumption by an internal combustion engine (RF patent No. 2084834 IPC G 01 F 9/00 of 07/20/97) containing a sealed consumable tank, pipeline, shut-off valve installed at the inlet of the consumable tank, a recording device and a differentiator, the input of which connected to a capacitive level sensor, and the output to a recording device.

The disadvantage of this device is that it is not structurally envisaged to take into account the fuel returned to the fuel tank from the high pressure fuel pump (TNVD), and therefore the measurement accuracy is low.

The technical result is aimed at improving the accuracy of measuring fuel consumption.

The technical result is achieved in that in a device for measuring fuel consumption by an internal combustion engine, comprising a sealed flow tank equipped with a capacitive level sensor, through a shut-off valve at its inlet and a fine filter connected to a low-pressure fuel pump and connected to a high-pressure fuel pump of the system fuel supply of the engine, a recording device and a differentiator, the input of which is connected to a capacitive level sensor, and the output to a recording device, additionally in a hermetic consumable tank with a built-in capacitive fuel level sensor connected to a high-pressure fuel pump for receiving excess fuel returning to the fuel tank, a shut-off valve installed at the output of the additional consumable tank, and a differentiator, the input of which is connected to the capacitive level sensor, and the output - to the registering device.

A distinctive feature of the prototype is that it is additionally introduced a sealed flow tank with an integrated capacitive fuel level sensor connected to a high pressure fuel pump to receive excess fuel returning to the fuel tank, a shut-off valve installed at the outlet of the additional flow tank, and a differentiator whose input is connected to a capacitive level sensor, and the output to a recording device.

The drawing schematically depicts the described device.

The device comprises a sealed supply tank 1, 2, equipped with a capacitive level sensor 3, 4, a pipeline 5, 6, a shut-off valve 7, 8, a differentiator 9, 10, a recording device 11 included in the fuel equipment of the engine, consisting of a low-pressure fuel pump ( Injection pump 12), fine filter 13, Injection pump 14. Injection pump 12 is connected to a fine filter 13, which through valve 7 is connected to the supply tank 1. The supply tank 2 is connected by a pipe 6 to the injection pump 14.

The differentiator and the recording device are made on a microprocessor circuit.

The device operates as follows.

When the engine is running, open valve 7. The sealed flow tank 1 begins to fill with fuel due to the excess performance of the fuel priming pump 12 over the fuel consumption of the engine. The air located in the tank casing 1 is then forced into the upper part of the casing and compressed. When the supply tank 1 is filled with fuel, which is detected by the level 3 sensor, close the valve 7, thereby disconnecting the standard low-pressure fuel supply system of the engine, and close the valve 8, thereby stopping the removal of excess fuel into the fuel tank. The fuel pump 14 is supplied with fuel from the supply tank 1 under the pressure of the compressed air in it. For an engine operating at a minimum stable idle speed, the fuel control lever is sharply shifted to the maximum feed position.

The electric signal from the level 2 sensor is fed to the input of the differentiator 9. The signal from the output of the differentiator 9 (the rate of change of the fuel level) is fed to the input of the recording device 11. Excess fuel is supplied from the high-pressure fuel pump 14 to the flow tank 2. The electric signal from the level sensor 4 is fed to the input differentiator 10. The signal from the output of the differentiator 10 is fed to the input of the recording device 11. The recording device 11 during acceleration of the engine determines the maximum value of the rate of change of the level of fuel entering the injection pump and returning excess fuel to the fuel tank.

Claims (1)

A device for measuring fuel consumption by an internal combustion engine, comprising a sealed flow tank equipped with a capacitive level sensor, through a shut-off valve at its inlet and a fine filter connected to a low pressure fuel pump and connected to a high pressure fuel pump of the engine fuel supply system, a recording device and a differentiator, the input of which is connected to a capacitive level sensor, and the output to a recording device, characterized in that it is additionally sealed the first supply tank with an integrated capacitive fuel level sensor connected to the high pressure fuel pump to receive excess fuel returned to the fuel tank, a shut-off valve installed at the output of the additional fuel tank, and a differentiator, the input of which is connected to the capacitive level sensor, and the output is to the recording device.