A new method for measuring fuel-injection rate /
The paper deals with the basic principles of use and testing of a new method for measuring injected volumes of liquids. The above method was employed in the measurement of the injected fuel volume in diesel injection systems, where the fuel is injected at time intervals of up to 4 ms. It works by me...
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| Format: | Book Chapter |
| Jezik: | English |
| Teme: | |
| Sorodne knjige/članki: | Vsebovano v:
Flow measurement and instrumentation |
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| Izvleček: | The paper deals with the basic principles of use and testing of a new method for measuring injected volumes of liquids. The above method was employed in the measurement of the injected fuel volume in diesel injection systems, where the fuel is injected at time intervals of up to 4 ms. It works by measuring the electric charge deposited by liquid droplets impacting the metal electrode. The electric charge is generated mainly in the injection nozzle, where the fuel rubs against the metal parts of injection nozzle, resulting in one portion of free electrons moving from the metal to the fuel. The fuel then transfers this electric charge to the sensor electrode. Rubbing merely serves to bring many points of the surface into good contact. The electric current appears also due to the temperature gradient in the sensor electrode. The temperature gradient in the electrode is a result of the transformation into heat of kinetic energy of fuel droplets hitting the electode velocities at 100-300 ▫$ms^{-1}$▫. The electric charge is led from the electrode to the charge amplifier, where it is converted into electric current. The test results showed a very reliable operation of the sensor and a linear dependence of the area under the injection rate curve upon the injected volume. The comparison of the injected rates measured with the charge and Bosch measuring method, which is most frequently used today, showed a good matching of results in any operating region. |
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| Fizični opis: | str. 159-165. |
| ISSN: | 0955-5986 |