SU987441A1 - Device for measuring maximum pressure of injection in internal combustion engine - Google Patents

Description

The invention relates to devices for diagnosing technical objects and can be used for in-place monitoring of the technical state of the fuel equipment of diesel engines.

Measurement devices are known, for example, maximum injection pressure to an internal combustion engine, comprising a pressure sensor, a pulse shaper, measurement resolution resolution, a peak detector, an indicator, and a synchronization circuit, the sensor and timing circuit being switched on at the inputs connected to the indicator, and the driver is connected to the sensor SI

However, such devices make it possible to measure the maximum injection pressure, the accuracy and reliability of which is limited by the instability of the maximum pressure.

The aim of the invention is to increase the reliability of measurements.

The goal is achieved by the fact that the synchronization circuit is made in the form of the Measurement button, the trigger trigger, the control trigger.

a kip-relay and a leading edge pulse shaper for a kip-relay signal connected in series, the output of a hinged edge pulse shaper of a kipp-relay signal connected to the trigger trigger, a pulse shaper connected to the control trigger, and a measurement resolution circuit connected to the kip-relay output .

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The drawing shows the block diagram of the device.

The pressure sensor 1 is connected to the pulse shaper 2 at the output of which the trigger trigger 3 is connected, to the second input of which trigger trigger 4 is connected, controlled by a single input by button 5 Measurement. The output of the trigger 3 is connected to the KIPP-relay 6, the output of which

20 is connected to the input of the driver 7 of the pulse of the falling edge of the signal of a kiprele, the output of which is connected to the second trigger input 4 of the trigger. The resolution circuit 8 is connected by the input.

Claims (1)

25 to the pressure sensor 1, the control input of the circuit is connected to the output of a creep 6. At the output of the measurement resolution 8, a pts detector 9 is connected to which an indicator 10 is connected. Button 5, triggers 3 and 4, a kipp-relay 6 and a driver 7 impulses sa trailing edge form a synchronization circuit. The device works as follows. The pressure sensor 1 generates a pulse, the voltage of which is proportional to the pressure in the pipeline. This pulse arrives at the measurement resolution circuit 8, which is in the Closed position, and at shaper 2, where the pulse is normalized in amplitude, fronts, and duration. From the output of the imaging unit 2, a pulse arrives at one of the inputs of the control trigger 3, and through the other input this trigger is controlled by a signal coming from the trigger 4. The start signal of the measurement comes from the Measurement button 5. When a signal is received from the pressure sensor 1 after pressing button 5 at the exit. control trigger 3, an impulse is generated that triggers a KIPC relay b, which forms a rectangular impulse of a given duration. This pulse enters the measurement resolution circuit 8 and opens the pressure pulse input from pressure sensor 1. This pulse arrives at the peak detector 9, where its maximum value is stored, and the result is measured by an indicator 10, for example a voltmeter. The duration of the impulse produced by the KIPP relay 6 is chosen longer than the duration of injection with sub-injections in any engine mode, but less than the time between injections. At the end of this pulse, the shaper 7 generates a trailing edge pulse, with which the trigger trigger 4 returns, to the initial state. By the signal from the trigger 4, the trigger 3 of the control returns to the initial state and does not further react to the pulses coming from the driver 2 until the button 5 Measurement is pressed. Such a device makes it possible to measure a single cycle of an engine, which makes it possible to reduce the subjective error of reading in a while. due to significant oscillations of the arrow caused by instability of the fuel supply, reaching values of ± 20 kgf / cm, i.e. increase the accuracy of measurements. A device for measuring the maximum injection pressure to an internal combustion engine, comprising a pressure sensor, a pulse shaper, a measurement resolution circuit, a peak detector, an indicator and a timing circuit, the sensor and the timing circuit are connected to the inputs of the measurement resolution circuit The driver is associated with a sensor, characterized in that, in order to increase the reliability of the measurements, the synchronization circuit is made in the form of a Measurement button, the start trigger, the control trigger, the kip-relay, and the trailing edge pulse driver of the kip-relay signal connected in series, the output of the trailing edge pulse shaper of the kip-relay relay connected to the trigger trigger, the pulse shaper connected to the control trigger, and the Kipp output The relay is connected to the measurement resolution circuit. Sources of information, rintye taken into account in the examination 1. Mozgalevsky AV and Gaskaov D.V. Technical diagnostics, m., Higher School, 1975 p. 157-163.