DE3619897C2 - Protection circuit for catalytic exhaust aftertreatment devices - Google Patents
Protection circuit for catalytic exhaust aftertreatment devicesInfo
- Publication number
- DE3619897C2 DE3619897C2 DE19863619897 DE3619897A DE3619897C2 DE 3619897 C2 DE3619897 C2 DE 3619897C2 DE 19863619897 DE19863619897 DE 19863619897 DE 3619897 A DE3619897 A DE 3619897A DE 3619897 C2 DE3619897 C2 DE 3619897C2
- Authority
- DE
- Germany
- Prior art keywords
- sensor
- fuel
- combustion engine
- internal combustion
- catalytic exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1496—Measurement of the conductivity of a sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/0007—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using electrical feedback
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Gas After Treatment (AREA)
Description
Die Erfindung bezieht sich auf eine Schaltung nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a circuit according to the Preamble of claim 1.
Aus der DE 34 32 715 A1 ist eine Anlage zum Erkennen von bleifreiem oder bleihaltigem Kraftstoff bekannt, deren Ziel darin besteht, bei bleihaltigem Kraftstoff die Ab gase über einen Bypass und die Abgasnachbehandlungsvor richtung herumzuführen und damit eine Beschädigung dieser Vorrichtung zu vermeiden.DE 34 32 715 A1 describes a system for recognizing unleaded or unleaded fuel known The aim is to reduce the amount of fuel containing lead gases via a bypass and the exhaust gas aftertreatment direction and thus damage it Avoid device.
Es ist ferner aus der AT-PS 32 69 57 bekannt, mittels ei nes Temperatursensors die Temperatur der Abgasnachbehand lungsvorrichtung zu messen. Ein kritischer thermischer Zustand der Vorrichtung läßt sich aus der Temperatur oder der Temperaturänderungsrate ableiten.It is also known from AT-PS 32 69 57, by means of egg the temperature of the exhaust gas aftertreatment measuring device to measure. A critical thermal State of the device can be determined from the temperature or derive from the rate of temperature change.
Beiden bekannten Schaltungen ist gemeinsam, daß sie eine anormale thermische Belastung des Katalysators nicht wirksam verhindern. Während mit der ersten bekannten Vor richtung nur eine Zerstörung des Katalysators durch bleihaltigen Kraftstoff verhindert wird, läßt sich mit der zweiten Schaltung eine auftretende thermische Überla stung des Katalysators aufgrund der Trägheit des über einen weiten Temperaturbereich eingesetzten Sensors nicht rechtzeitig erkennen. Both known circuits have in common that they are one abnormal thermal load on the catalyst is not prevent effectively. While with the first known pre direction only by destruction of the catalyst lead-containing fuel is prevented, with the second circuit an occurring thermal overload stung of the catalyst due to the inertia of the a wide temperature range used sensor do not recognize in time.
Der Erfindung liegt die Aufgabe zugrunde, eine Schaltung zur Anzeige bzw. zum Verhindern einer anormalen thermi schen Beanspruchung einer katalytischen Abgasnachbehand lungsvorrichtung einer Brennkraftmaschine mit den im Oberbegriff des geltenden Hauptanspruchs angegebenen Merkmalen derart weiterzubilden, das auch bei Verwendung von bleifreiem Kraftstoff ein ordnungsgemäßer Betrieb der Brennkraftmaschine gewährleistet ist.The invention has for its object a circuit to display or prevent abnormal thermi stress of a catalytic exhaust gas aftertreatment lungsvorrichtung an internal combustion engine with the im General term of the applicable main claim Develop features in such a way that even when used of unleaded fuel proper operation of the Internal combustion engine is guaranteed.
Die Erfindung löst diese Aufgabe durch die kennzeichnen den Merkmale des Patentanspruchs 1.The invention solves this problem by characterizing the features of claim 1.
Wesentliches Merkmal der Erfindung ist die indirekte Ar beitsweise. Es wird anhand des Eingangsstroms der Kraft stoffversorgungspumpe, d. h. im Vorfeld der Brennkraftma schine und der Abgasnachbehandlungsvorrichtung eine Meß größe gewonnen, die einen unmittelbaren Rückschluß auf eine zu erwartende Gefährdung, insbesondere der Abgasnach behandlungsvorrichtung, zuläßt. Bei dem Sensor kann es sich um einen handelsüblichen und relativ preisgünstigen, aber dennoch zuverlässigen Strom- oder Spannungssensor handeln.An essential feature of the invention is the indirect ar at times. It is based on the input current of the force fuel supply pump, d. H. in advance of the internal combustion engine machine and the exhaust gas aftertreatment device a measurement size gained, which gives an immediate conclusion an expected hazard, especially the exhaust gas after treatment device, allows. With the sensor it can is a commercially available and relatively inexpensive, but still reliable current or voltage sensor act.
Die Wahrscheinlichkeit für eine Gefahr für die Abgasnach behandlungsvorrichtung ist bei einem Fehler in der Kraft stoffversorgung sehr hoch. Die indirekte Bestimmung einer derartigen Gefahr hat den Vorteil, daß bereits vor oder unmittelbar zu Beginn einer anormalen Beanspruchung der Abgasnachbehandlungsvorrichtung der Fehler erkannt und auf die Notwendigkeit einer Abhilfemaßnahme hingewiesen bzw. eine derartige Maßnahme eingeleitet werden kann.The probability of a hazard to the exhaust gas after treatment device is in the event of a fault in the force material supply very high. The indirect determination of a Such danger has the advantage that before or immediately at the beginning of an abnormal stress on the Exhaust gas aftertreatment device recognized the fault and on pointed out the need for a remedy or such a measure can be initiated.
Der Eingangsstrom einer elektrischen Kraftstoffversor gungspumpe ändert sich bei vollständiger Entleerung des Kraftstoffbehälters unmittelbar vor Erreichen dieses Zu stands besonders stark und häufig, da die Kraftstoffpumpe nur noch diskontinuierlich Kraftstoff fördert.The input current of an electric fuel supplier supply pump changes when the Fuel tank immediately before reaching this Zu stood particularly strong and often because of the fuel pump only delivers fuel discontinuously.
Neben der Möglichkeit, den Eingangsstrom der Kraftstoff versorgungspumpe hinsichtlich seiner Änderungsrate zu un tersuchen ist im Patentanspruch 2 eine besonders vorteil hafte Ausgestaltung der Erfindung angegeben. Dabei wird das Ausgangssignal des Strom-Sensors mit einem Ver gleichswert verglichen und damit Änderungen des Sensor-Aus gangssignals, wie sie auch bei "normalen" Betrieb der Brennkraftmaschine auftreten, von den Änderungen unter schieden, wie sie dann auftreten, wenn der Kraftstoffvor rat zur Neige geht.In addition to the possibility of the input flow of fuel supply pump with regard to its rate of change to un tersuchen is a particular advantage in claim 2 adhesive embodiment of the invention specified. Doing so the output signal of the current sensor with a ver equivalent value and thus changes in the sensor off output signals, as they also in "normal" operation of the Internal combustion engine occur from the changes below divorced as they occur when the fuel advice is running low.
In der Zeichnung ist ein Ausführungsbeispiel der Erfin dung dargestellt. Die einzige Figur zeigt eine Schaltung für den Betriebszustand einer Kraftstoffeinspritzpumpe einer Brennkraftmaschine.In the drawing is an embodiment of the Erfin shown. The only figure shows a circuit for the operating state of a fuel injection pump an internal combustion engine.
Bei der in der Figur dargestellten Schaltung wird ein Meßstrom I, der proportional dem Versorgungsstrom einer nicht dargestellten elektrischen Kraftstoffeinspritzpumpe ist, einer Meßbrücke 20 zugeführt. In dieser befinden sich 3 Festwiderstände 21 bis 23 sowie ein NTC-Widerstand. In der Brückendiagonalen ist ein Differenzverstärker 25 mit nachgeschaltetem Kompa rator 28 angeschlossen, an dessen anderem Eingang eine Vergleichsspannung Umax liegt. Der Komparator 26 steuert ein Relais 27, das Einspritzventile 28 bei stromdurchflos sener Relaiswicklung von ihrer Spannungsversorgung trennt.In the circuit shown in the figure, a measuring current I, which is proportional to the supply current of an electric fuel injection pump, not shown, is fed to a measuring bridge 20 . In this there are 3 fixed resistors 21 to 23 and an NTC resistor. In the bridge diagonal, a differential amplifier 25 with a connected comparator 28 is connected, at the other input of which there is a reference voltage Umax. The comparator 26 controls a relay 27 which separates the injection valves 28 from their voltage supply when the relay winding is current-carrying.
Sofern ausreichend Kraftstoff im nicht dargestellten Kraft stoffvorratsbehälter ist, wird durch den Meßstrom I der NTC-Widerstand 24 auf einem definierten Widerstandswert gehalten. Der Nullabgleich der Meßbrücke ist auf diesen Wert vorgenommen.If there is sufficient fuel in the fuel reservoir, not shown, the NTC resistor 24 is kept at a defined resistance value by the measuring current I. The measuring bridge is zeroed to this value.
Bei Kraftstoffmangel kommt es gegenüber dem stationären Einspritzdruck zu pulsierendem Abfall des Druckes, wobei auch der Strom durch die Kraftstoffpumpe und damit der Strom I abnimmt. Über den nun steigenden Widerstandswert des NTC-Widerstands 24 erfolgt eine Verstimmung der Meßbrücke 20. Diese Spannungsabweichung wird über den Differenzverstärker dem Komparator zugeleitet. Dieser steuert das Relais 27 an, solange die Spannung in der Brückendiagonalen größer als der Vergleichswert Umax bleibt.If there is a lack of fuel, there is a pulsating drop in pressure compared to the stationary injection pressure, and the current through the fuel pump and thus the current I also decrease. The measuring bridge 20 is detuned via the now increasing resistance value of the NTC resistor 24 . This voltage deviation is fed to the comparator via the differential amplifier. This controls the relay 27 as long as the voltage in the bridge diagonal remains greater than the comparison value Umax.
Umax entspricht dabei dem gerade noch zulässigen Druck abfall in der Kraftstoffpumpe durch auftretenden Kraft stoffmangel. Hierdurch wird vermieden, daß geringe Druck schwankungen im Einspritzsystem zu einer fehlerhaften Diagnose führen.Umax corresponds to the just permissible pressure drop in the fuel pump due to force lack of fabric. This will avoid low pressure fluctuations in the injection system to a faulty Perform diagnosis.
Sind die Druckschwankungen jedoch größer, wie dies bei zur Neige gehendem Kraftstoffvorrat der Fall ist, so trennt das Relais 27 die Einspritzventile 28 von ihrer Spannungs versorgung. Damit werden die Einspritzventile abgeschaltet und die thermische Belastung der Abgasnachbehandlungsvor richtung verhindert.However, if the pressure fluctuations are greater, as is the case when the fuel supply is running low, the relay 27 separates the injection valves 28 from their voltage supply. The injection valves are thus switched off and the thermal load on the exhaust gas aftertreatment device is prevented.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863619897 DE3619897C2 (en) | 1986-06-13 | 1986-06-13 | Protection circuit for catalytic exhaust aftertreatment devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863619897 DE3619897C2 (en) | 1986-06-13 | 1986-06-13 | Protection circuit for catalytic exhaust aftertreatment devices |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3619897A1 DE3619897A1 (en) | 1987-12-17 |
DE3619897C2 true DE3619897C2 (en) | 1993-10-07 |
Family
ID=6302921
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19863619897 Expired - Fee Related DE3619897C2 (en) | 1986-06-13 | 1986-06-13 | Protection circuit for catalytic exhaust aftertreatment devices |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3619897C2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19622071B4 (en) * | 1995-06-02 | 2005-08-04 | Denso Corp., Kariya | Fuel delivery system for internal combustion engine |
DE102008033194A1 (en) * | 2008-07-15 | 2010-01-21 | Continental Automotive Gmbh | Unwanted gas fractions i.e. air fractions, detecting method for fuel injection system in motor vehicle, involves detecting temporary pressures drops whose size value is smaller than size value of entire pressures drops |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997015468A2 (en) * | 1995-10-18 | 1997-05-01 | Robert Bosch Gmbh | Method and device for detecting and documenting damage to catalytic converters |
DE19548684B4 (en) * | 1995-12-23 | 2010-02-18 | Robert Bosch Gmbh | Method for detecting and documenting exhaust-related malfunctions of a vehicle with an internal combustion engine using on-board means |
DE19607284B4 (en) * | 1996-02-27 | 2014-03-13 | Robert Bosch Gmbh | Method for detecting and documenting exhaust-related malfunctions of a vehicle |
DE19607461B4 (en) * | 1996-02-28 | 2012-12-13 | Robert Bosch Gmbh | Method for detecting and documenting exhaust-related malfunctions of a vehicle with an internal combustion engine using on-board means |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE788422A (en) * | 1971-09-10 | 1973-01-02 | Snam Progetti | AUTOMATIC CONTROL DEVICE FOR CATALYTIC POTS |
DE2303773A1 (en) * | 1973-01-26 | 1974-08-01 | Volkswagenwerk Ag | ARRANGEMENT FOR EXHAUST GAS EXHAUST |
AU6455974A (en) * | 1973-01-26 | 1975-07-17 | Lucas Electrical Co Ltd | Reducing the level of pollutants in the exhaust emission |
DE2304622A1 (en) * | 1973-01-31 | 1974-08-15 | Bosch Gmbh Robert | DEVICE FOR MONITORING CATALYTIC REACTORS IN EXHAUST GAS DETOXIFICATION SYSTEMS OF COMBUSTION MACHINES |
DE2444334A1 (en) * | 1974-09-17 | 1976-03-25 | Bosch Gmbh Robert | METHOD AND EQUIPMENT FOR MONITORING THE ACTIVITY OF CATALYTIC REACTORS |
DE3339429A1 (en) * | 1983-10-29 | 1985-05-09 | Volkswagenwerk Ag, 3180 Wolfsburg | System for reducing exhaust pollutants |
DE3432715A1 (en) * | 1984-09-06 | 1986-03-13 | Wolfgang 8047 Karlsfeld Roth | System for the detection of unleaded or leaded fuel and diverting of the exhaust gas flow by way of conventional exhaust systems or exhaust systems with catalytic converter by means of an automatically or manually operated switching valve, also suitable for retrofitting |
DE3437422A1 (en) * | 1984-10-12 | 1986-04-17 | Heinz Dipl.-Ing. 2900 Oldenburg Struß | Night-current thermal-storage heating stove |
-
1986
- 1986-06-13 DE DE19863619897 patent/DE3619897C2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19622071B4 (en) * | 1995-06-02 | 2005-08-04 | Denso Corp., Kariya | Fuel delivery system for internal combustion engine |
DE102008033194A1 (en) * | 2008-07-15 | 2010-01-21 | Continental Automotive Gmbh | Unwanted gas fractions i.e. air fractions, detecting method for fuel injection system in motor vehicle, involves detecting temporary pressures drops whose size value is smaller than size value of entire pressures drops |
DE102008033194B4 (en) * | 2008-07-15 | 2010-04-08 | Continental Automotive Gmbh | Method and device for the detection of gas fractions in a fluid system of a vehicle |
Also Published As
Publication number | Publication date |
---|---|
DE3619897A1 (en) | 1987-12-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE4320173C2 (en) | Diagnostic methods for motor vehicles for checking electronically controlled systems | |
EP0277955B1 (en) | Monitoring device for an electronic control system in a motor vehicle | |
DE102006000420B4 (en) | A common rail fuel injection system configured to avoid a fault in determining common rail fuel pressure | |
DE602006000455T2 (en) | Sensor measurement error | |
DE2824190A1 (en) | MICRO COMPUTER SYSTEM FOR THE CONTROL OF OPERATING PROCEDURES IN MOTOR VEHICLES, WITH A DIAGNOSTIC DEVICE FOR CHECKING THE VEHICLE | |
DE3128475C2 (en) | ||
DE4216067C2 (en) | Method and device for tank ventilation diagnosis in a motor vehicle | |
DE19729696C2 (en) | Method and device for monitoring the function of a gas probe | |
DE2809023A1 (en) | DIGITAL COMPUTER FOR ELECTRONIC INJECTION | |
DE3619897C2 (en) | Protection circuit for catalytic exhaust aftertreatment devices | |
DE3335339C2 (en) | Arrangement for diagnosing an internal combustion engine | |
WO2001035065A1 (en) | Method for testing the performance and/or adjustment of an exhaust gas temperature sensor | |
DE3516981A1 (en) | Method for checking the functionality of an exhaust gas catalyst | |
DE3335338A1 (en) | ARRANGEMENT FOR DIAGNOSIS OF AN INTERNAL COMBUSTION ENGINE | |
DE10010857A1 (en) | Fuel feed fault detection method for motor vehicle engine, compares current flows in pumps and compares them to produce correction signal | |
WO1987006303A1 (en) | Device for detecting the start of injection in a diesel engine | |
DE102008007397A1 (en) | Method for monitoring at least one glow plug of an internal combustion engine and device for this purpose | |
DE3145732C2 (en) | ||
DE112015005434T5 (en) | Error detection device | |
DE2336522A1 (en) | Electronic monitoring of I.C. engine - with shutdown actuation if coolant and/or lubricant temp and/or press. excessive | |
DE3705823A1 (en) | METHOD AND DEVICE FOR CHECKING A LAMBDA MEASURING PROBE | |
EP0240875B1 (en) | Testing device for measuring the contact resistance of an electrical connector between an energy source and an electrical apparatus | |
DE2051538A1 (en) | Device for monitoring the exhaust gas temperatures of an internal combustion engine | |
EP0437658B1 (en) | Protection device for an electric machine | |
DE19722549A1 (en) | Electrical measuring device or electrical measuring method for generating an electrical signal |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8110 | Request for examination paragraph 44 | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |