The device for injection rate measuring (Fig. 2) consists
of two parts: sensor A which is used for the detection
of fuel and amplifier B which receives and amplifies
the charge. The voltage obtained at the output from the
amplifier can be measured with an appropriate measuring
instrument, e.g. an oscilloscope.
The housing 1 of sensor A is made of a material with
good insulating properties, and the electrode 2 used for
fuel detection, on the other hand, of a material which
conducts electric current.
The electrode 2, onto which the fuel is injected, must
be inclined at an angle of 80° to the fuel jet axis, which
allows better outlet of the fuel. The electrode surface
must be polished, as the volume of the charge generated
while the fuel slides against the metal is dependent upon
the finish quality of the surface. Fuel outlet from sensor
A must be as fast as possible so that the fuel remaining
in the sensor does not interfere with the next jet.
We tested several types of amplifiers. We obtained the
best results with high input resistance amplifiers. The
most important are the resistor R5, for which we experimentally
established the value R5 5 1 MV, and the
capacitor C, for which the experimentally established
value is C 5 0.5 pF. With those values, we achieved the
best results. The amplifier was designed so as to ensure
amplification between 2 to 20 times. Amplification is
controlled with the potentiometer R1.
Fig. 3 illustrates the measured injection rate with voltage
Uosc plotted on the vertical axis and time on the horizontal
axis
The device for injection rate measuring (Fig. 2) consists
of two parts: sensor A which is used for the detection
of fuel and amplifier B which receives and amplifies
the charge. The voltage obtained at the output from the
amplifier can be measured with an appropriate measuring
instrument, e.g. an oscilloscope.
The housing 1 of sensor A is made of a material with
good insulating properties, and the electrode 2 used for
fuel detection, on the other hand, of a material which
conducts electric current.
The electrode 2, onto which the fuel is injected, must
be inclined at an angle of 80° to the fuel jet axis, which
allows better outlet of the fuel. The electrode surface
must be polished, as the volume of the charge generated
while the fuel slides against the metal is dependent upon
the finish quality of the surface. Fuel outlet from sensor
A must be as fast as possible so that the fuel remaining
in the sensor does not interfere with the next jet.
We tested several types of amplifiers. We obtained the
best results with high input resistance amplifiers. The
most important are the resistor R5, for which we experimentally
established the value R5 5 1 MV, and the
capacitor C, for which the experimentally established
value is C 5 0.5 pF. With those values, we achieved the
best results. The amplifier was designed so as to ensure
amplification between 2 to 20 times. Amplification is
controlled with the potentiometer R1.
Fig. 3 illustrates the measured injection rate with voltage
Uosc plotted on the vertical axis and time on the horizontal
axis
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