SU578017A3 - Exhaust device - Google Patents

Description

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The invention relates to the field of engine building, namely to exhaust devices of internal combustion engines.

Exhaust devices are known, containing a Bttte silencer with a catalytic weymtransporter and a bypass valve connected via an actuator using an internal combustion engine operating parameter sensor.

Ossyuki vaaaaaaaaaTaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaw measure all of the above control accuracy in the 1sht process of neutralization, resulting in the following: quickening of the catalytic neutralizer.

The goal of iiso (uTles ex c v v increase the life of a weutra).,.

This is achieved by: That is an integral mechanism linked through the OR circuit with the sensors, the rate of the atura of the neutralizer, the number of revolutions and the degree of discovery (Fossel of the Pacific Ocean).

FIG. 1 is given a block bypass of catalytic silencer 1 through an electric valve 2, controlled automatically by an electromechanical control device 3; in fig. 2 - control circuit diagram of the electromechanical device,.

The automatic control unit 3 has three input stages, which are used for vehicle speed and engine speed, for the degree of opening of the primary stage and for the temperature of the catalyst in catalytic silencer I, respectively, and. an output stage which is given by a logical signal (1), 11 input signals from the input stages, in which the bypass switch to the agan 2 is controlled.

Input cascade that reacts to vehicle speed or engine speed, engine speed sensor 4, which generates a vacuum, is proportional to the speed of movement or something else. o60ojatoB, moreover, this is a matter of comparison. & Comparison node 5 with the reference voltage, with a potentiometer G. Differ: Kie} i (Ay called voltage controls the speed level discriminator 7, the output of which is connected to the key OR 8 output stage In this case, the output of the discriminator 7

Sigyap open kpapbna on Vits only in the case when the voltage produced by the sensor 4s is higher than the voltage value, which is connected from potentiometer 6, i.e. when the speed of your engine revs exceeds the preset value.

The input helper reacts pa the degree of opening of the throttles, contains the discriminator Ea level, to the input of which the difference is supplied to the voltage of the signal from the throttle valve position sensor Yu, obtained, for example, by means of a potentiometer, the engine of which is connected to the throttle valve and voltage sender, from a potentiometer 11 ,

At the output of dnsrymtator 9, it is possible to learn a signal only when you speak, when the name of the WAA paaiffiua is polar, i.e. when the degree of opening of the throttle is greater than the set reference value. One / ito outgoing signal of this discriminator is temporally supplied to delay circuit 12, producing a pulse after a certain period of BpeMeHTij and to an And 13 type circuit, to which a delay pulse is also applied. The output cxe№i AND activates the operation of the accumulator 14, the output of which is directly connected to the key circuit OR 8 of the output stage. In this case, the accumulator 14 will give a signal to open the valve to the output stage, not when the signal, m „8, is present at the output of the central valve 9. when the degree of opening of the throttle exceeds the most advanced level, but only when the throttle is open more than this level during the time of the corresponding at least delay time of the delay circuit 12, Indeed, the key circuit And 13 opens and excites accumulator 14 only when its output contains both signals, and therefore, even if there is an output signal of the discriminator 9, but its duration is less than that required to generate a pulse by delay circuit 12, the AND 13 circuit will not open. In this case, it is possible to prevent the opening of the mutual valve 2

 in the case of a full acceleration having a duration, for example, when changing gears (city traffic).

The accumulator 14 is also necessary because the output signal of the AND 13 circuit is short-term test, while the valve opening signal must be present all the time while the degree of opening of the throttle is set to the set level. The accumulator 14 containing sequential 0th triggers : or NO circuit., is intended to memorize and convert the input signal into a continuous output signal and send) {and this signal as long as there is a signal at the output of the discriminator 9. When this last signal is pref aschaets, since the degree of throttle opening was mensche predetermined level, the accumulator 14 is reset to zero by the same output of the discriminator 9, inverted by inverter 15.

The third input stage, responsive to the temperature of the catalyst in catalytic silencer 1, contains a thermoelement 16, whose voltage proportional to temperature is amplified by an operational amplifier 17. The output signal from the amplifier is differentiated by means of an RC circuit containing a resistor 18 and a capacitor 19 , and then compared in the 2 O comparison node with a reference signal, set by potentiometer 21 and corresponding to the limiting breaking temperature. The acquired differential signal is fed to the discriminator 22 level, the output of which is connected to the named key circuit OR output stage. In this case, the comparison node 20 has a signal that is the sum of the signal, proportional to temperature, and its time derivative, and therefore the discriminator 22 generates an output signal for opening the valve not when the catalyst temperature reaches the value, but when achieved by the summed signal. Therefore, the discriminator 22 releases the overhead valve 2 until the temperature T is reached. On the other hand, the signal from the thermoelement 16, amplified by the operational amplifier 17, is also compared with the B node of comparison 23 with the reference signal obtained from the potentiometer 24, proportional to the burnt current temperature T, the excess of which, although not destroying the catalyst, significantly shortens the period him .

The overtemperature signal received in the comparison node 23 is simultaneously applied to the relay contact 25 and to the input of the middle level discriminator 26, the output of which, exciting the above mentioned relay, includes the same signal at the output of the integrator 27, which integrates this over temperature signal spends time proportional to the magnitude of this signal in order to achieve the integral threshold | GO level T | set by potentiometer 28. The achievement of the integral threshold level Tj, which means that the temperature exceeds the operating value for a certain period of time and therefore is dangerous for the catalytic silencer catalyst, is suppressed by the level discriminator 29, which triggers the accumulator of the DA, the output of which is connected to the key scheme OR 8 output stage.

The ZO drive is similar to the aforementioned one, the drive 14, has the same functions as the latter, leads to zero output of the discriminator 26 inverted by the inverter 31.

Through this last part of the device circuit, it is possible to send a valve opening signal to the output stage each time the catalyst temperature exceeds a certain critical value. The duration of which is dangerous for the catalyst allows the integral threshold value Tj to reach the output of integrator 27.

Potentiometer 35 serves to calibrate the operational amplifier 17.

And, finally, the output stage of the device in accordance with the invention contains the already mentioned key scheme OR 8, logical signals are opened for opening the valve from the input stages, and the output of which excites turn-around time 32 capable of generating pulses of a given duration. These pulses are fed along with the output of the key circuit OR 8 to the input of another key circuit OR 33, the output of which directly through the channel 34 controls the bypass electrical switch 2.

In this case, the bypass valve 2 remains open, not only when there is a single logical signal at the input of the 9-pinch scheme OR 8, it does not remain Open,

even if the named logical signal

for example, due to signal oscillations around the cut-off limits, time relay 32, when energized, continues to generate a valve open signal for the entire predetermined period of time. The potentiometer 35 serves to calibrate the opamp 17.

Claims (4)

1. An exhaust device containing a silencer with a catalytic converter and a bypass valve connected through an actuator to an operating parameter sensor of an internal combustion engine, characterized in that, in order to increase the life of the neutralizer, the actuator is connected through an OR circuit to neutralizer temperature sensors, revolutions and throttle openings. 2. The device according to claim 1, stating that the CTeneim sensor is open (the fuse gate is connected to the input of the OR circuit through the AND gate and drive, and one of the inputs of the AND gate sensor through a time relay. 3. Arrangement according to ШТ.1 and 2, that is, that the temperature sensor is connected with one of the inputs of the OR circuit through a differentiating circuit, and with the other input - through an integrating circuit. 4. The device of claim 1, stating that the OR circuit consists of two logical OR elements, the output of one of which is directly connected to the input of the other through a time relay.