DE2244227C3 - Electrical control device for a bypass valve of a catalytic converter muffler for the internal combustion engine of a motor vehicle - Google Patents

Description

ο sends out and fed to an AND gate circuit above which the catalytic converter is destroyed

S becomes, which would be the delay from the delay pulse, or if the derivation of the temporal change

circuit is also achieved, the output tion of the catalyst temperature after the time one

ff- the AND circuit associated with a memory exceeds a certain value by reaching the

j is, furthermore, through a third catalytic converter which is high up on its muffler and which leads to the decomposition of the catalytic converter

% Catalyst temperature responsive input stage to avoid temperature.

f which a thermocouple includes its voltage The further embodiment of the described above

H signal amplified by an amplifier by a control device according to the invention also provides

H ÄC differential circuit differentiates and with a then for an opening of the bypass valve when the

Comparison signal is compared that of a Po- io catalyst temperature for a certain Zeuoauer

fj tentiometer is generated and a destruction limit exceeds a certain value T _s which the le-

ΐ corresponds to the temperature of the catalytic converter, whereby the service life of the catalytic converter is reduced

resulting difference signal at the input of a dis- Preferably is still in the output stage ; krimmators, and finally by the output of the OR gate circuit a 15 actuating the bypass valve via an output at the same time to a second OR gate circuit Output stage supplied with an OR gate circuit and a timer that identifies an output, which sends the output signal of the discriminatory pulse of a certain duration to the OR gate the first input stage, the memory and circuit sends the output of which the bypass valve of the discriminator of the third input stage is actuated. This creates a continuous opening and is switched. 30 prevents the bypass valve from closing if the In the control device according to the invention, the signal coming from the input stages is around the the output stage from which to the degree of opening of the intervention limit values fluctuates. With it appears itself Intake manifold appealing entrance stage only if for some reason a swan The signal to open the bypass valve is supplied, if the intervention limit occurs, at Einwenn the opening of the suction pipe for a passage of the first OR gate circuit no signal agreed time period greater than a certain time to open the «vr-ssvntils. The once aroused Value is what, for example, when driving via the timer constantly sends a signal, the bypass motorway the case is to keep the catalytic converter muffler valve open for a certain period of time, is therefore only when it is necessary, namely the electrical control device according to the invention Full and short-term accelerations, 30 can come from the vehicle battery or from the mains for example in city traffic. can be fed for roller tests.

The following is based on the associated drawing

speaking input stage reacts to the change, for example a preferred embodiment

the catalyst temperature over time explained in more detail prior to the invention,
suffice one to destroy the catalytic converter. 1 shows schematically in a block diagram

intervene provoking limit temperature T _n ^ _x . a catalytic muffler with a bypass,

It can also be based on the integral of the temperature of one of the electromechanical

rise above a certain temperature T _s niche control device controlled electric valve

respond over time to prevent having.

temperatures constantly prevail which cause the catalytic converter to age quickly without destroying it. Implementation of the electro-mechanical device according to the invention is that supplied by the thermocouple and controlled by the niche control device of FIG. 1.
Amplifier amplified voltage signal with a In the drawing, with 1 compared to protective comparison signal, the catalytic from a potentiometer muffler 2, the electric Bymeter is generated and an operating temperature T _s 45 pass valve and 3 the electrical Steuervorrichentspricht, and the resultant Difference signal called device. According to the invention, this 3 has three simultaneously to a relay and a first dis- input stages, each directed to the speed of the macriminator whose output the relay appears, to the degree of opening of the intake pipe and excites and the difference signal to the input of a to the catalyst temperature Muffler 1 supplies to integrators, the output signal of which speaks with a 50, and an output stage which is compared by the integration threshold value signals, logical output signals of the input stages which is supplied by a potentiometer, which is sufficient and which controls the bypass valve 2
this difference signal is fed to a second discriminator which responds to the speed of the machine and which excites a memory whose input stage includes (see FIG. 2) a tachogenerator output with the output stage of the device 4 for the speed of the Machine that is bound to one of these. The voltage proportional to the speed is generated, which is then compared to the bypass valve which is kept open by means of a potentiometer6 and interrupts the comparison voltage established with it. The exhaust gas flow through the catalytic converter muffler, the difference between these two voltages sets a drift ϊ when the speed of the machine or the vehicle Ci number discriminator 7 in operation, whose output with ■ speed a certain value, for example the OR gate circuit 8 the output stage refers to 50 km / h. exceeds in 3rd gear when bound. In this way, at the output {■■ the opening of the intake pipe for a certain time of the discriminator 7 only a Ventuoffnungsdaüer a certain value, for example 80 °, appears when the generated by the tachometer generator exceeds, so that the catalytic converter muffler 65 Voltage higher than that at the potentiometer 0 euig £ "is only used when the full accelerated voltage is, that is, when the pressure is only of short duration and when the catalytic number of the machine has a certain value and the temperature is a limit temperature T _max exceeds, which is, for example, 50 km / h in 3rd gear.

_e fne KC-differential circuit having a

^^ l ^^^^^ 5 resistor "and a capacitor21 differenist ^ the ^ B dur ^ em P °" nüom ^ ^ ^ ^, ^^^ ^ _{inera v}

SiLSÄiJSÄ songang no vent opening signal when the catalyst of the _ß ^ S ^ ™ ^ f _ch ^ ₁₂ , sator temperature reaches the value T ^, but the ^^^^^ terSSf impulTaus- when this value is reached by the sum signal. which is ao after a ^ «™ ΐΖΐ3. The discriminator 24 sends a summary, and the BypassventU2 reaches a "^^^ J ^ JA, before the limit temperature ktf, which ^{is calibrated by the v} « ° JP3 | gSt * SSbTSS T ^ _x e ^, and therefore prevents the The output ^^^ SuiA of the fault temperature is reached. On the other hand, ^e ^ o ^S r? L "iH? RderAuiSssmfe connected to the signal of the thermocouple 17 through the output ^^ SSSwSt £ StS ^ & ä« Aus a ₅ stronger 18 amplified, also at node 25. In this way i ^ jSSuSsignal, _if compared to a comparison signal, which from the Potengangssmfe then k ^ e ^ toungssig ^, ^^ ^ _& ^ ^ _{a haumaMa} ψ-

iT ^ S ^ £ ^ SSS ^^ e ^^ ^be "operating temperature T" e.g. 500 ° Q is proportional,

ie w ⁶¹¹ ^ ™ ^6. "™: !!!; ^ ™ but only if it does not destroy the catalyst immediately,

stormed value ^ exceeds, ^ but only, but shortens its lifespan in the long term,

the throttle opening is stronger than nasty junction 25 resulting temperature

^ t ffÄSäSSaSTlS «SSSit L rise signal wJthen at the same time to a terminal

^ GaSauTÄeS energizes the memory of a relay27 and the input of a first D.s-

AND Oatterscnaitung ο _AuS g _ang both Si kriminators passed 28 whose output signal by

¹ Γ SeS- ^ a ₀ CT opens the AND switch 35 that relay energizes, the same signal at the output

gnale present sm ^ therefore onne ^ ^ _atQn . _{29 evokes} ^ _the ^ j _1n integrating

tungl3 even then ^ not ^ if the ™ * * J. _d - temperature rise signal until it is reached

of the Disknmmator 9 found Ktj ^^, » _{u of the} integer determined ^{by 1} ^ _{n PotentioSr 30}

^dOCh A * T fti liouises noSSg ht This gration threshold value T ₁ requires a time that the

to the delivery ^ "J ^^ dSthat the bypass- ₄ o size of the signal is proportional The achievement

^Wei £, ^k T VT ^ l ^ ikStoX ^ ™ * this integraü ^ nsschweUenwertsT, means that the

Γ JHlv ζ rBeSunigSgen 4 while the operating temperature is already one for the catalytic converter

short duration 5Λ "JJJ ^ ^{8 K of} the muffler detrimental period of time, and

ΑÄ necessary if that is detected by a second discriminator 31, the

the Ul £) circuit 13 a short 45 energizes a memory 32, the output of which with the

Segefd ^ Ventilöinungssignal an OR gate circuit S of the output stage connected

SS ΧSpeicher 32 is of 14 constructed similarly to the above-mentioned memory toeiiie series and has the same effect micht circuits S "and how this through the inverter 33 from the environmentally ^ 5l ^g of swept output signal of the first Diskriminatoi, 28

λ · «« ™ «1 tu hold until the output of the device, it is therefore possible to

NA Si * 5 "Α wlmTdieses Si ₅₅ speed step whenever an opening signal to Vento

knmmators »« n Mgnai opening of the send when the catalyst temperature emen

«Nal mcht meta ^ hande ^^ ^ Serschntten voted critically» value T. exceeds that on

Ir <Sierl4 by the same, of a duration is detrimental to the catalyst and it is the same

uÄäSe output signal of the discriminating output of the integrator 29 enables the integration

fm n ^ sptTt 6o ^gration threshold T ₁ to be reached.

2MeSSi shows a display device 16, FIG. 2 also shows a potentiometer 37 for

• χί · ΐί A ** ™ * mßolidi is the travel speed adjustment of the amplifier 18.

^ "iSdSSehuiSäSderMaSrunddSi The output stage of the crfmdungsgcmäfcn pre

ness or 'Umdrehungszani_ ^α "Ι ™? *" ¹¹ _make. direction includes the one already mentioned

^ TÄSaiSrie Ä K ^ S- _6s OR ^ atterschaltangS, which from the logical? Valve-

The third incoming mare ^ aie aui _opfs > ^ ο ^^^^ βΐ is reached by the incoming mare

■ m thermocouple 17 stages comes and its output a timer

proportional tension 34 excited, which emits a pulse of a certain duration

send from wire

kt and will. ' then a ffer- ■ i Ver ter 23 eratur t. The “crimi-OER-i is.

^: with ten-

■ is, hears,

iur- • ime

can. This pulse of a certain duration, which is generated by the timer 34 once excited, becomes the input of another together with the output signal of the OR gate circuit 8 OR gate circuit 35 supplied, the output 36 of which actuates the electrical bypass valve 2.

In this way, the bypass valve 2 is not only kept open when the input of the OR gate circuit 8 a single logical signal appears, but also when the logical signal z. B. disappears as a result of a fluctuation around its lower intervention limit value; because the timer 34 sends out a valve opening signal for the entire time specified in it, once it is excited.

1 sheet of drawings

-ng ^r en 'en

:; or
nd

Claims (3)

connected with the output stage of the device: 4 Device according to Claim 3, characterized in that the memory (32) is a series 1. Electrical control device for a By- 5 of FUp-Flop- or OR-NOT-Schalpassventil of a catalytic converter muffler for the hung and by the inverted internal combustion engine of a motor vehicle, characterized by the (33) inverted output signal of the first disk a first one, on the kriminators (28) is set to zero.
Speed of the machine responsive input 5. Device according to claim 1, characterized in that a tachometer generator (4) for the rotary io that in the output stage has the payout of the machine, the output signal of the OR gate circuit DC voltage with a is compared by a potentiometer (6) in time to a second OR gate circuit (35) built up comparison voltage, and a timer is supplied, the one where the difference of these voltages is fed to the input output pulse of a certain duration to this output of a discriminator (7) WirJ 15 sends a circuit whose output (36) actuates the bypass through a second, the degree of opening of the adapter valve (3) intake manifold appealing entrance stage that has a
Discriminator (9) includes, at the entrance of the Difference between the voltage applied to the development of the intake throttle is proportional, and the ao
Equivalent voltage given by a potentiometer The invention relates to an electrical control process at the same time a delay circuit direction for a bypass valve of a catalyst off (12), which after a certain time an inoculation pot for the internal combustion engine of a power pulse sends out, and an AND gate circuit aj vehicles. (13) is fed from the delay pulse The currently used catalyst Ausder Delay circuit also reached puffers have the task of preventing the delivery of harmful the output of the AND circuit having borrowed components in the exhaust gases of the internal combustion engine Memory (14) is connected. to reduce machine of a motor vehicle. To the 2. Apparatus according to claim 1, characterized in that it is 30 increasing the life of the catalytic converter indicates that the memory (14) is a series expedient, then to untervon the flow of the exhaust gas Flip-flop or OR-NOT scarf break if he is particularly strong and through the same, would lead to damage to the catalyst, what then Inverter (15) reverse output signal of the case when due to an operational error in the Discriminator (9) is set to NuU. Furthermore 35 catalyst too high a temperature occurs, or through a third, on the muffler catalytic converter - if it is useless, which is the case if the gate temperature responsive eirgangsstufe, the internal combustion engine for example at high speed Thermocouple (17) includes, the chip numbers only a small amount of harmful Benungssignal amplified by an amplifier (18), releases constituents in the exhaust gases. from an ÄC differential circuit (20, 21) dif- 40 An interruption of the exhaust gas flow through the referenced and with a comparison signal is similar to that of a potentiometer (23) bypassing the muffler via one of a is generated and reaches a destruction limit temperature control device operated bypass valve, rature {T _max ) of the catalyst, where it is the underlying structure of the invention the resulting difference signal would be the input 45, an electrical control device for a by- a discriminator (24) is fed, and pass valve of a catalyst muffler for the finally a bypass valve (3) to be developed via an internal combustion engine of a motor vehicle Output (36) actuating output stage, with no, which opens the bypass valve when a an OR gate circuit (8), the exhaust specific muffler catalyst temperature, a output signal of the discriminator (7) of the memory 50 certain speed of the machine or a certain (14) and the discriminator (24) is fed. correct opening of the suction pipe occur. 3. Device according to claim 1 or 2, there- To solve this problem, the invention is characterized in that the electrical control device supplied by the thermometer is supplied by a first element (17) and responsive to the speed of the machine from the amplifier (18) Voltage signal with a transitional stage, which is compared to a tachometer generator for the constant rotation signal, which has a number of the machine, whose output pantentiometer (26) is generated and an operation with a temperature (T _s ) built up by a potentiometer corresponds, and that the resulting comparison voltage is compared, the Difrende difference signal at the same time to a reference of these voltages to the input of a Dislais (27) and a first discriminator (28) 60 is fed through a second, on, the output of which the relay excites the degree of opening of the suction pipe and the differential signal to the input ei nes input stage, which includes a discriminator, supplies to integrator (29) whose output signal whose input is the difference between the chip flute an integration threshold value signal (T ₁ ) , which is compared to the position of the intake manifold throttle, which is proportional to a potentiometer 65, and the comparison voltage, which is supplied by (30), this difference signal being set up a potentiometer, is applied, and a second discriminator (31) is fed, the output of which simultaneously a delay switch excites a memory (32), the output of which after a certain time an impulse