SU1121480A1 - Stand for running in fuel injection pumps - Google Patents

Abstract

STOP FOR FLOATING INJECTION PUMPS, containing frame, drive, hydraulic equipment and automatic control circuit, including a program block associated with the actuators, characterized in that, in order to ensure the quality of running in, the stand is also equipped with a torque sensor, and the automatic control circuit includes a differentiating link, an integrator, a RMS calculation block, an adder and a comparator, the torque sensor output being connected to the differential input erentsiruyuschego unit, input unit for calculating rms values and to one input of the integrator, a second input coupled to an output of the differentiating unit, the output of the integrator is coupled to the first input of the adder. BTOpoii, the input of which is connected to the output of the calculation base of the RMS value, and the output of the adder is connected to the input of the compiler R torus, the output of which is connected to the pro (L gram block provided with feedback from the torque sensor output.

Description

to

00

FIELD OF THE INVENTION The invention relates to engine-building, in particular to equipment for about. rollers fuel injection pumps.

A stand for running-in of fuel injection pumps is known, comprising a frame, an actuator, hydraulic equipment and an automatic control circuit including a program block associated with the actuators 1.

The disadvantage of the test bench is the poor quality of running-in of top-injection pumps due to the lack of follow-up monitoring of the running-in dynamics during the running-in process.

The purpose of the invention is to increase the quality of the run-in by establishing a follow-up monitoring of the torque value and switched running-in modes while stabilizing this value.

The goal is achieved by the fact that a stand for running-in of fuel-injection pumps containing a frame, a drive, hydraulic equipment and an automatic control circuit, including a program block associated with the actuators, is equipped with a torque sensor, and the automatic control circuit includes a differentiator, an integrator, the RMS calculation unit, the adder and the comparator, wherein the torque sensor output is connected to the input of the differentiating link, the input of the calculating unit rms value and one of the integrator inputs, the second input of which is connected to the output of the differentiating link, the integrator output is connected to the first input of the adder, the second input of which is connected to the output of the RMS calculation unit, and the output of the adder is connected to the comparator input, the output of which is connected to a program block provided with feedback from the torque sensor output.

The drawing shows a structural scheme of controlling a test bench for running-in fuel injection pumps.

The bench contains a frame, an actuator, hydraulic equipment (not shown), a torque sensor I, an automatic control circuit 2, and an actuator 3.

The automatic control circuit 2 includes a differentiator link 4, an integrator 5, a root mean square calculation unit 6, an adder 7, a comparator 8 and a software block 9. The torque sensor output i is connected to the input of the differentiating link 4, and the input of the root mean square value block 6 one at the inputs of the integrator 5, the second input of which is connected to the output of the differentiating link 4. The output of the integrator 5 is connected with the first input of the adder 7, the second input of which is connected to the output of the RMS calculation unit 6 th value, and the output of the adder 7 is coupled to the input 5 of the comparator 8. The output of the comparator 8 is connected to a program unit 9 provided with feedback from the output 10 of the sensor 1 torque.

The stand works as follows.

The run-in of the fuel injection pump is carried out at three successively increasing frequencies of rotation of the pump shaft, while controlling the magnitude of the torque. The transition to each subsequent C1 $ orient mode is carried out only when the torque value is stabilized and completes the run-in at the nominal frequency of rotation of the pump shaft. The operation of the stand is controlled by an automatic control circuit.

0..

The signal from the torque sensor I when the fuel injection pump is run-in is fed to the input of differentiating link 4 and simultaneously to the inputs of the 5 N integrator 5 of the RMS calculation unit 6, where the signal is integrated and the RMS value of the torque is calculated respectively. 6 is synchronized. The signals from the outputs of the integrator 5 and the calculator 6 of the RMS value are fed to the inverting and non-inverting inputs of the adder 7, and the resulting signal, equal to their difference, comes from the output

An adder 7 to the input of the comparator 8, where it is compared with the magnitude of the reference voltage.

As the friction losses in the running-in process decrease and the magnitude of the torque moment decreases, the magnitudes of the output signals from the integrator 5 and the RMS calculation unit 6 come closer together. At the end of the run-in period, the magnitude of the torque agent is stabilized, and the signal from the output

5, adder 7 becomes equal to the reference voltage of the comparator 8, as set during bench setup. This leads to a change in the polarity of the comparator 8 and the formation of a corresponding control signal in the software block 9, which at one time blocks the automatic control circuit 2 through feedback 10. At the same time, the executive bodies 3 set the subsequent running-in mode or terminate it.

Due to the establishment of a follow-up monitoring of the torque value during running-in of the fuel-injection pump

3P21480

the implementation of the automatic switching of the pump parts during the gykatka is essentially realized by the run-in mode, and its termination is injected, which contributes to an increase in the long-term stand quality of the running time of the pump.

Claims (1)

STAND FOR A BREAK-IN OF FUEL INJECTION PUMPS, containing a frame, drive, hydraulic equipment and an automatic control circuit including a program unit associated with executive bodies, characterized in that, in order to improve the quality of the break-in, the stand is additionally equipped with a torque sensor, and in the circuit the control includes a differentiating link, an integrator, a rms calculation unit, an adder and a comparator, and the output of the torque sensor is connected to the input of the differential link, by the input of the rms value calculation unit and with one of the integrator inputs, the second input of which is connected to the output of the differentiating link, the integrator output is connected to the first adder input, the second input of which is connected to the output of the rms calculation unit, and the adder output is connected to the comparator input the output of which is connected to a software unit provided with feedback from the output of the torque sensor. ._____________10_ 4 - e 5 7 s β J — 1 ί 1 6 G ' ~ ’Oh - * 9 i 1 r. Z >