SU249849A1 - DEVICE FOR MEASURING ANGLE / LEAD PREPARATION OF A FUEL PUMP INJECTION - Google Patents

Description

Devices for measuring the advance angle of fuel injection pumps for diesel engines are known, which include a slotted disk mounted on the shaft of the pump, sensors for starting the injection and the end of reference, and a recording unit made in the form of a stroboscopic indicator.

The described device differs from the known ones in that the recording unit is designed as an electric pulse generator, which sends a signal through logic elements to a counter mechanism with a digital lamp indicator.

This simplifies the measurement of the advance angle and allows it to be obtained as a digital index in degrees of rotation.

The drawing shows a device for measuring the advance angle of the fuel pump injection.

A disk 2 with a slit 3 is mounted on the shaft 1 of the adjustable fuel pump. Using an electric lamp 4, the photosensor 5 generates a signal to start or stop the counting of the recording unit 6. The second signal of the beginning or end of the counting is sensed by the recording unit from the injector 8 sensor 7. In the recording unit 6 The received signal, for example, counting from the photo sensor 5, is fed through the amplifier-shaper 9 and the trigger 10 to the logic element 11. The logic element is connected to the generator 12 pulses of adjustable frequency. The frequency of generator 12 is consistent with the speed of the variable pump. With a frequency of 3600 Hz in one

one pump pulse rotation will correspond to 0.1 ° angle of rotation. Logic element 11 is also associated with a counting trigger 13, to which a signal is received from trigger 10 through a delay element 14. Signals

at the output of the flip-flops 10 and 13, if they coincide, they open the logical element 11 of the type "H" for passing pulses from the generator 12, which through the logical element 15 of the type "DO NOT enter the logical element

16 of the type “I.- Next, the pulses go to the shaper 17 and through the one-shot 18 to the input of decades 19 of the four-digit digital display. The scoreboard is ignited at the end of the pulse counting by the trigger command 13 through matching elements of the type NOT 20, 21. The counting of the pulses occurs on the number of sensors 7, for which they are connected to the forward input of the trigger 22 through the driver amplifier 23.

The signal from the trigger 22 is fed to the logic element 16 and then through the driver 17, the one-shot 18 to the input of the decades of the 19 digital boards. The reset bus of the decade receives a signal from the output of flip-flop 13 through the formation via the matching element 26 of the type "NOT and the trigger 22 with the logic element 15 of the type" NOT.

Using the switch 27, the recording unit detects the results of the measurement of the injection advance angle of any of the injectors 8 of the multi-plunger fuel pump.

Subject invention

A device for measuring the advance angle of an injection of a FUEL pump, such as a diesel,

containing a slotted disc mounted on the pump shaft, the sensors for starting the injection and the end of reference, and a recording unit, characterized in that, in order to simplify the measurement and to obtain a digital index in degrees of rotation, the recording unit is designed as an electrical generator | supplying a signal through logic elements to a counting mechanism with digital

lamp indicator.

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