SU853463A1 - Device for internal combustion engine diagnostics - Google Patents

Description

(54) DEVICE FOR DIAGNOSTICS OF INTERNAL COMBUSTION ENGINE

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The invention relates to the field of structures of internal combustion engines, namely, devices for diagnosing internal combustion engines.

Known devices for diagnosing internal combustion engines include a gear disk, instead of one of the teeth of which there are two closely spaced teeth, an induction sensor connected to a driver and an integrator, the output of the latter connected to the input of a comparator whose output through an inverter is connected to one of the circuit inputs a match, the input of this circuit is associated with the output of driver 1.

The electronic circuit generates pulses from the sensor signal, which are equal in rotation angle of the disk, and at the moment of passing of two closely spaced teeth, it additionally generates a base mark that serves as a reference point.

The disadvantage of this device is that it is necessary to install a special disk on the shaft, which is not always possible, moreover, the electronic circuit works only if the width of the tooth and the cavity is equal, and a special design of one of the teeth is also necessary. The purpose of the present invention is to achieve unification and functionality enhancement.

. This goal is achieved in that a device for diagnosing an internal combustion engine comprises a gear disk with one different tooth, an induction sensor connected to a driver and an integrator, the output of the latter connected to the input of a comparator, whose output through an inverter is connected to one of the inputs of the coincidence circuit, this input circuits associated with the shaper output. Moreover, the toothed disk is made with one shortened tooth by the value of 0.05-0.1 modulus of the scraper, 5 and a regular tooth is used as the toothed disk.

FIG. 1 is a schematic diagram of the device; in fig. 2 - curves illustrating the operation of the device.

jg The device contains a toothed disk 1 mounted on the shaft 2. A sensor 3 mounted in close proximity to the tooth disk 1. The sensor 3 winding is connected in parallel to the inputs of the former 4 and the integrator 5. The output of the integrator 5 is connected to the first input of the comparator 6 and through the amplitude the detector 7 to the second input of the comparator 6. The output of the comparator 6 is connected via an inverter 8 to one of the inputs of the matching circuit 9; the output of the former 4 is turned on to the second input of this circuit. Terminals 10 and 11 are output. A rotating toothed disk 1, the scan of which is depicted in curve 1 of FIG. 2, mounted on shaft 2, induces pulses in curve 1 of a sensor 3 (curve 2, figure 2). The amplitude of the pulses is proportional to the speed of rotation of the disk 1, and the frequency is equal to the frequency of the teeth passing past the sensor 3. The pulse corresponding to the reduced tooth is smaller in amplitude than the others. The integrator 5 converts the winding voltage of the sensor 3 into a voltage that is close in shape to a sinusoidal voltage with the same negative half-waves corresponding to the valleys. The positive half-waves corresponding to the teeth m are also identical, except for one corresponding to the underestimated tooth, and the amplitude of the half-waves does not depend on the angular velocity of the knees of the shaft 2 (curve 3 in Fig. 2). A portion of the voltage from the amplitude detector 7 is supplied to the second input of the comparator 6. Thus, the response level Lcp of the comparator 6 monitors the amplitude value of the signal of the integrator 5 and if for any reason (temperature change or gap change between the sensor receiver 3 and the gear disk ) the sensitivity of the receiver of sensor 3 will change, the circuit will track this change. When the device is adjusted and adjusted, the level of the operation of the comparator 6 is adjusted so that the amplitudes of the positive half-waves corresponding to the normal teeth m are higher than the trigger threshold, and the amplitude corresponding to the shortened tooth is lower, i.e. the trigger level is where A is am 1 the length of the positive half-waves at the integrator output, corresponding to a normal tooth m; B - amplitude corresponding to the shortened tooth. At the output of co.parator 6 there are pulses corresponding to all the teeth of m except the shortened one (curve 4 of Fig. 2). Inverter 8 outputs on one of the inputs of the joint scheme 9 at the time of passage 1 | - and near the sensor 3 there is a short chub. The second input of circuit 9 coincides with short (Kirov other) pulses, corresponding to transitions through zero voltage in the winding of sensor 3 (curve 5, fig. 2), i.e. corresponding to the moments of coincidence of the geometric i) c: i-all teeth (including yKopo ic-iicro) through the axis of the sensor 3. At the output of the 9 c.viasen circuit there is only one IMPULSE corresponding to the short tooth (curve 6 of fig. 2) . The signal of the inverter 6 only "permits the passage through the circuit 9 of coincidence of the diffused pulse. This corresponds to a short tooth, so the instability (drift) of the integrator 5 and co.parator 6 in the wide range does not affect the accuracy of the measurement, and the shaft turns. Terminals and pulses are removed from terminals 10 and I 1. c () corresponds to angles of the marks (curve 5 of fig. 2) and to the origin (curve b of fig. 2). In the case where the quality of the toothed disk is used by the staff; (Lestern, one of the teeth is reduced in height by 0.1 tons. (i Ti is a module)). Such a revision is easy to comprehend and practically does not account for the coefficient of overlap. For example, for m 2.5, the last one is smart) 11aet from .52 to 1.48 with a valid 1.08. The use of an ogssashyugo device permits, without the need for a substantial, gh lh engine operating current, mo.cpppz. machines in use and (used at a constant speed of the engine. J.IO. 1.Devices;) telem and integratorok, bb ;;,: OL keys to the input of the comparator, the output of which is through the inverter coe ;; i iH with one.; from the inputs of the coincidence circuit and, the input of this is associated with the output of the mold. Ogli / sychees that. for the purpose of unification and dissipation of B () zmoz:; {; crcc usg; Counting tooth Iss (). KopoSJi; 2. Device iit; i ;. 1. 07 by the fact that as zchbcha-gchg g) it is luccTOpiiH, with MLV 0.05 - a splintered tooth with a tooth on n 0.1 gear module. Sources of philanthropy. FINE; e sun; i; iAiaii ie prk VKCIi 1. Patent of the Federal Republic of Germany, Nb 2L5G) о, cl. H 02 K 24:00. () ;: kill -: ik. L76.

Claims (2)

Formula! .13obre; m: o; _: - 1. A device for a gas turbine engine of internal combustion engine, containing a gear disk e with one reference tooth, an induction sensor connected to the former and integrator, the output of the latter is connected to the input of the comparator, the output of which is connected through an inverter to one of the inputs of the matching circuit, the input this circuit is associated with the output of the shaper, characterized in that, in order to unify and expand the functionality of the device, the reference tooth is made shortened. 2. The device according to g ;. 1. characterized in that a regular gear is used as a toothed disk, with one tooth reduced by a height of 0.05—0.1 shesgernsh modules