Ultrasonic measuring device and method for single fuel injection mass

Abstract

The invention discloses an ultrasonic measuring device and method for single fuel injection mass. In the prior art, the ultrasonic measurement of the single fuel injection mass has the characteristicsof high accuracy and convenience in measurement, but the single fuel injection mass can only be obtained by measuring the pressure change of a container and the sound velocity of a medium in the container, the reflection coefficient of the boundary of different mediums and the sound velocity in the container cannot be measured, and the application is quite limited. The ultrasonic measuring devicecomprises a measuring device body (15), wherein an ejector (4) is arranged above the measuring device body (15); a temperature sensor (1) and a safety valve (6) are respectively arranged on two sidesof the measuring device; an ultrasonic transducer (11) is arranged at the bottom of the measuring device; the temperature sensor is connected with a data collector (13) through a wire; a pulse generation / receiver (12) is respectively connected with the data collector and the ultrasonic transducer through a wire; and the data collector is connected to a display and controller (14). The ultrasonicmeasuring device is used for measuring the single fuel injection mass.

Description

Technical field: [0001] The invention relates to the field of non-contact measurement, in particular to an ultrasonic measuring device and method for measuring the quality of a single fuel injection, and is also applicable to the measurement of the quality of a single tiny injection in the process of high-pressure injection of other liquid media. Background technique: [0002] High-pressure common rail fuel injection technology is an important means to reduce engine exhaust emissions and improve fuel economy. However, due to reasons such as manufacturing, assembly and control, the amount of fuel injected into the cylinder in each working cycle and the fuel injected into each cylinder of the engine The quantity is inconsistent, which leads to the instability of engine running speed and the increase of emissions; [0003] In order to reduce the inconsistency of the fuel injection quantity, measuring the single fuel injection quantity and compensating the fuel injection control...

AI Technical Summary

Problems solved by technology

[0002] High-pressure common rail fuel injection technology is an important means to reduce engine exhaust emissions and improve fuel economy. However, due to reasons such as manufacturing, assembly and control, the amount of fuel injected into the cylinder in each working cycle and the fuel injected into each cylinder of the engine The quantity is inconsistent, which leads to the instability of engine running speed and the increase of emissions;

[0003] In order to reduce the inconsistency of the fuel injection quantity, measuring the single fuel injection quantity and compensating the fuel injection control become an effective method to improve the speed control of the diesel engine. There are two kinds of detection methods. The detection methods of the average oil quantity mainly include measuring cylinder method, weighing method, volumetric method, etc.; the measuring cylinder method has low measurement accuracy due to the manufacturing error of the measuring cylinder, scale error and visual error during measurement; the weighing method It is necessary to input the sprayed fuel into a fixed container, use an electronic balance to weigh the change in the mass of the fuel injection volume container, and obtain the average fuel injection volume by simple conversion. The discharged fuel is collected in a container with a certain volume, and the total number of fuel injections when the fuel is filled with the container is recorded, and the fuel injection quantity in each working cycle can be obtained by calculation, and the measurement accuracy is relatively low;

[0004] At present, the existing technology uses ultrasonic waves to measure the quality of a single fuel injection, which has the characteristics of high accuracy and convenient measurement, but it is necessary to obtain the quality of a single fuel injection by measuring the pressure change of the container and the sound velocity of the medium in the container, and cannot measure two different media. The reflection coefficient of the boundary and the sound velocity in the container, the application is very limited

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