SU473380A3 - A device for diagnosing an internal combustion engine - Google Patents

Description

one

Devices are known that contain a vibration sensor connected via a amplifying and filtering unit to a first input of a logic cell, an electronic gate unit with an equalization system connected to a second input of a logic cell, and a recorder.

However, obtaining an unsatisfactory ratio between the signal and noise makes it difficult and lengthens the diagnostic operation.

The aim of the invention is to accelerate and improve the accuracy of diagnosis by improving the control system of the electronic gating device and the recorder.

This goal is achieved by the fact that the control system is made in the form of an inductive probe connected through a pulse shaper to serially connected multivibrator and integrator. A capacitor, a transistor and an electronic gating unit are connected in parallel to each of the two outputs of the latter. Transistors are connected via a resolution unit to the input of a recorder connected to a pulse shaper.

The drawing shows the proposed device.

The device contains a vibration sensor 1, connected via a reinforcement unit and filters) P1 2 with the first input of logic cell 3. The electronic gating unit 4 is equipped with a control system 5 and connected to the second input of the logic cell 3. The recorder 6 is made in the form of a resistance circuit and capacitance 7 connected in series through an amplitude voltmeter 8 with a second resistance circuit and capacitance 9 and a 1 MWR recording speed, 11m potentiometer 10. The control system is designed as an inductive probe 11 connected via an imprinter 12 with series-connected multivibrator 13 and integrator 14. Each of the two outputs of the integrator 14 connects in parallel the capacitors 15, 16 and the transistors 17, 18 and the electronic gating unit 4. The transistors 17, 18 are connected through an enable unit 19 with an amplitude voltmeter 8 which also connect with the pulse shaper 12.

When performing diagnostics operations, the vibration sensor 1, through the amplification and filtering unit 2, supplies a spgnal with an open logic cell 3 through the resistance circuit and capacitor 7 to the recorder 6. The electronic strobe unit 4 opens through the control system 5 during the period from the start of the release phase to the game point, so that

3

its opening coincides with the peak of the maximum pressure in the engine cylinder.

An inductive probe 11 picks up a 1PP impulse with each ignition moment and feeds it through impulse driver 12 and stump zibrator 13 to current integrator 14, at the output of which a voltage inversely proportional to velocity is obtained. By this way, capacitors 15, 16 are charged, which, with the following zero: 1, are discharged through a common transistor driver (.7, 18). The discharge is controlled by the resolving unit 19. At the moment when the capacitor 15 reaches zero, it is used to open the electronic strobe of block 4, which is closed at the time of discharge of the co-generator 16 by the logic cell 3. The opening of the strobe of its block coincides with a cycle in which vibration is detected. In the remainder of the PCC, various noises on the recorder S are not affected. The signal passes a resistance circuit and a capacitance 7, where oti Ignigravnutsya and with a constant time order of several times; n, for the thousandth of a second, it is supplied to the amplitude of the first voltmeter 8. The last} H1J,; about one millisecond, received from pulse generator 12, is transferred to the initial position. The received vbradnonny signal is proportional to the mean value4

, 1 detected by the vibration sensor 1 n ne) iodine electronic gating: GKR i. This signal, integrated at a value of 11; the effects of capacitance 9 with a constant speed of about two seconds, is transmitted at a fast speed; a recording recording note 1G to record it as a function of time and n and

1. A device for diagnosing an engine; 1-for-blue combustion; contains a sensor r,; a bracne, connecting through a block of gain;: filtering filter n-1 with a non-terminating logic input

; -: A circuit, an electronic strobe unit with an un-connected system, connected to the second input of a logic cell, and a recorder, except for the fact that, in order to accelerate; increase diagnostic accuracy, system

control) 5 is in vnde inductive probe connected through a shaper nmiy, 4bco} i e; Consequently, connected with the multim 1 by the selector, to each of the two B1, ho ;; s which are parallel to the copeps; 1tor, transistors n electron C) the building block.

2, Device but n. i, about nl and niee with leM, that the transients are connected via a soldering unit to the input of the recorder, connected to the pulse shaper.