Abstract:
Method and system for adaptation of an electrochemical gas sensor (4) situated in the exhaust line (3) from a combustion engine. Sets of measured values are recorded at three or more different times during a period when the composition of the engine's exhaust gases is maintained substantially unchanged. Each set of measured values comprises a value which corresponds to the magnitude of the sensor's measurement signal, and a value which corresponds to the temperature of the amount of exhaust gases received in the sensor's measuring chamber. A temperature regulating means of the sensor is controlled in such a way that the temperature of said amount of exhaust gases is different at the time of each recording. The values in said sets of measured values and the relationship between them which is indicated by the general gas law serve as a basis for determining a value for one or more constants which form part of the signal processing algorithm used for converting the sensor's measurement signals to a value which represents the concentration of a specific gas in the exhaust gases. The sensor is adapted by adjustment of the signal processing algorithm according to the value determined for each constant.
Abstract:
Abhängig von einem aktuellen Betriebszustand (BZ) einer Brennkraftmaschine und/oder von einem vorgegebenen Partikelanzahl-Emissionsgrenzwert (PE) wird eine Kohlenwasserstoff-Mindestkonzentration (HCMK) eines Brennraumabgases der Brennkraftmaschine ermittelt, die erforderlich ist für ein Einhalten des vorgegebenen Partikelanzahl-Emissionsgrenzwerts. Ein Betrieb (B) der Brennkraftmaschine wird vorgegeben zum Erhalten einer Kohlenwasserstoff-Konzentration (HCK) des Brennraumabgases, die mindestens so groß ist wie die ermittelte Kohlenwasserstoff-Mindestkonzentration (HCMK).
Abstract:
The invention relates to a method for operating an internal combustion engine, in which one operational parameter of said engine is modified in accordance with emission values of the exhaust gas to influence the emission values. According to said method, the emission values of two pollutant components of the exhaust gas, such as CO, NO, NO2, NH3, SO2, H2S, CH4 and/or additional HC components are determined and if the emission value of a first pollutant component exceeds a predetermined maximum threshold value, the value of one operating parameter is modified to reduce the emission value of the first pollutant component, whereby an increase in the emission value is permitted for at least the second pollutant component up to a maximum value. The invention also relates to a method for operating an internal combustion engine comprising a lambda probe, located in the exhaust system, according to which the emission values of two pollutant components of the exhaust gas are used to calibrate the lambda probe. The invention further relates to a method for operating an internal combustion engine, in which the emissions of said engine are used to diagnose the operating condition of the engine. According to said method, the emission values of two pollutant components of the exhaust gas are determined and compared with predefined nominal values and the result of said comparison is used to form a condition signal that is characteristic of the operating condition of the internal combustion engine.
Abstract:
Bei dem Verfahren zum Betrieb einer Brennkraftmaschine, beispielsweise eines insbesondere magerlauffähigen Ottomotors oder einer Dieselbrennkraftmaschine, bei dem mindestens ein Betriebsparameter der Brennkraftmaschine in Abhängigkeit von Emissionswerten des Abgases zur Beeinflussung der Emissionswerte verändert wird, ist vorgesehen, dass die Emissionswerte von mindestens zwei Schadstoffkomponenten des Abgases, wie CO, NO, NO2, NH3, SO2, H2S, CH4 und/oder weitere HC-Komponenten, ermittelt und, wenn der Emissionswert einer ersten der mindestens zwei Schadstoffkomponenten, einen vorgegebenen maximalen Schwellwert überschreitet, der Wert von mindestens einem Betriebsparameter, beispielsweise eine Drosselklappenstellung, einer Abgasrückführrate, ein Zündzeitpunkt, eine Tumble-Klappenstellung, ein Einspritzzeitpunkt, ein Ladedruck, und/oder eine Phasenstellung der Nockenwelle oder dergleichen, zur Absenkung des Emissionswertes der ersten Schadstoffkomponente verändert wird, wobei zumindest für die zweite der mindestens zwei Schadstoffkomponenten eine Erhöhung des Emissionswertes bis zu einem Maximalwert zugelassen wird. Es wird ferner bei einem Verfahren zum Betrieb einer Brennkraftmaschine mit zumindest einer in der Abgasanlage angeordneten Lambda-Sonde, insbesondere einer Breitband-Lambda-Sonde, zur stetigen Regelung des Lambda-Wertes des Abgases, vorgeschlagen, dass zur Kalibrierung der Lambda-Sonde die Emissionswerte von mindestens zwei Schadstoffkomponenten des Abgases, insbesondere Stickoxyd, Kohlenwasserstoff und/oder Kohlenmonoxyd herangezogen werden. Bei einem weiteren Verfahren wird zum Betrieb einer Brennkraftmaschine, bei dem die Schadstoffemission der Brennkraftmaschine zur Diagnose des Betriebszustandes der Brennkraftmaschine herangezogen wird, vorgeschlagen, dass die Emissionswerte von mindestens zwei Schadstoffkomponenten des Abgases ermittelt und mit vorgegebenen Sollwerten verglichen werden und dass das Vergleichsergebnis zur Bildung eines für den Betriebszustand der Brennkraftmaschine charakteristischen Zustandssignals herangezogen wird.
Abstract:
The present invention concerns a system for regulating the fuel-air mixture in a multi-cylinder internal combustion engine (1), a sensor combination for a similar system, and a process for determining the mixture of fuel and air in an internal combustion engine. Only by using a single sensor arranged in the exhaust gas piping after the exhaust gases from a multi-cylinder internal combustion engine have been combined, can a cylinder by cylinder regulation of the fuel-air mixture take place. The present invention utilises a sensor (10) with a binary output signal, i.e. that provides a signal switching between two signal levels. With a rapid-acting sensor that is sensitive to HC can be determined for each individual combustion event whether the combustion has taken place with an excess of fuel, i.e. a net reducing mixture in the exhaust gases, and the relative excess amount of fuel. The relative excess amount of fuel is proportional to the state, i.e. the pulse width, of the signal level that is indicating the level of the excess fuel. The present invention permits the fuel supply to each individual cylinder to be regulated more closely, so that stoichiometric combustion can be maintained during continuous operation, whether the operation is under constant load or during transients.
Abstract:
An evaporative emissions (EVAP) control system (136) for a vehicle includes a purge pump (160) configured to pump fuel vapor to a direct injection (Dl) engine of the vehicle via a vapor line (164) and a purge valve (148) and a hydrocarbon (HC) sensor (168) disposed configured to measure an amount of HC in the fuel vapor. The system also includes a controller (140) configured to detect an HC vapor supply condition indicative of an operating condition of the Dl engine where engine vacuum is less than an appropriate level for delivering the fuel vapor to the Dl engine via the vapor line; and in response to detecting the HC vapor supply condition, controlling at least one of the purge pump and the purge valve, based on the measured amount of HC, to deliver a desired amount of fuel vapor to the Dl engine to decrease particulate matter (PM) produced by the Dl engine.
Abstract:
An engine control system and method of controlling an engine system are provided. The engine control system includes at least one sensor module configured to generate an exhaust condition signal based on a determined condition in an exhaust component and a cylinder bank control module communicatively coupled to the at least one sensor module. The cylinder bank control module is configured to cause transmission of a first bank control signal to cause a first bank of cylinders of an engine to deactivate at least in part in response to a determination based on the exhaust condition signal that a hydrocarbon mass quantity is above a pre-determined hydrocarbon mass quantity threshold.
Abstract:
Système d'estimation de la richesse du mélange gazeux dans la chambre de combustion d'un moteur (1) à combustion interne d'un groupe motopropulseur de véhicule automobile, comprenant des moyens (43) pour injecter un gaz additionnel combustible dans un circuit d'admission (3) en air frais du moteur, des moyens (36, 44) pour mesurer des concentrations du gaz additionnel respectivement dans le circuit d'admission (3) en air frais et dans un circuit d'échappement (4) des gaz du moteur, des moyens de détermination (46) pour déterminer un rapport entre la mesure de la concentration du gaz additionnel dans le circuit d'admission et la mesure de la concentration du gaz additionnel dans le circuit d'échappement, et des moyens d'estimation (47) pour estimer la richesse du mélange gazeux dans la chambre de combustion du moteur à partir du rapport déterminé.