摘要:
Die Erfindung betrifft eine Abgasanlage einer Brennkraftmaschine (1) mit einer Abgasreinigungsvorrichtung (3, 5) sowie mit einem evakuierbaren Speichervolumen (8), in das insbesondere nach einem Start der Brennkraftmaschine für eine gewissen Zeitspanne zumindest ein Teil des Brennkraftmaschinen-Abgasstromes einleitbar ist. Erfindungsgemäß ist neben einem bei stillstehender Brennkraftmaschine das Vakuum im Speichervolumen haltenden Sperrventil (10) eine Unterdruckpumpe (18) zur Evakuierung des Speichervolumens vorgesehen. Dabei kann neben einer in der Abgasanlage stromab der Abgasreinigungsvorrichtung vorgesehenen Sperrklappe (6) in einer den Brennkraftmaschinen-Abgasstrom zum Speichervolumen führenden Zweigleitung (7) ein Regelventil (9) zur dosierten Befüllung des Speichervolumens vorgesehen sein. Ferner kann die Abgasanlage bereichsweise doppelwandig ausgeführt, sein, so daß zwei im wesentlichen koaxial zueinander verlaufende Abgasleitungen vorliegen, wobei über die erste, vorzugsweise innere Abgasleitung das Abgas von der Brennkraftmaschine weggeführt und über die zweite, vorzugsweise äußere Abgasleitung zum Speichervolumen hingeführt wird.
摘要:
A profiled knitted metal mesh wire ring interposed between the end of tile fixed metal cone and the nearest face of the ceramic monolithic block containing the catalytic reagents, of such a shape and configuration that it serves to hold the said metal cone and monolithic block in correct axial alignment. This correct axial alignment ensures the optimum flow of the hot engine exhaust gases from the metal cone into the monolithic block such that the required catalytic reactions may occur. The flexible construction of the knitted metal mesh wire ring permits the thermal expansion of the fixed metal cone linearly towards the face of the ceramic block to be compensated for without permitting the two components to make contact and cause damage one to the other.
摘要:
Mit derartigen Systemen werden zum Beispiel Katalysatoren (5), Rußfiltereinrichtungen oder die Verbrennungsluft beheizt. Für diese unterschiedlichen Einsatzgebiete bestehen Abhängigkeiten von Betriebsparametern. Das neue Brennersystem weist hierfür die Merkmale auf, der Brennstoff wird dem Einspritzsystem der Brennkraftmaschine über eine Brennstoffleitung (11) entnommen, in dieser Brennstoffleitung (11) ist ein Brennstoffregler (17) angeordnet, in einer zwischen Luftgebläse und Brennersystem bestehenden Brennluftleitung (12,20) ist ein Brennluft-Druckregler (22) angeordnet, dieser ist über eine Referenzdruckleitung (38) mit dem in einer der Brennkammern (6,8,9) oder der Brennkraftmaschinen-Abgasleitung (2) herrschenden Druck beaufschlagt. Das neue Brennersystem eignet sich für Brennkraftmaschinen-Fahrzeuge.
摘要:
A control system for controlling operation of an internal combustion engine detects a selected one of two exhaust modes: a first exhaust mode in which exhaust gases are guided through a first catalytic converter (16) upstream of a second catalytic converter (17), and a second exhaust mode in which exhaust gases are guided through a bypass passage (14a) bypassing the first catalytic converter (16). A control mode of the control system is determined according to which of the two exhaust modes is selected. The amount of fuel supplied to the engine and/or the ignition timing may be varied between values suitable for each exhaust mode. Correction of an air-fuel ratio control parameter based on the output from an oxygen sensor (32) may be inhibited when the second exhaust mode is selected.
摘要:
In a process for monitoring the performance of a catalyst (8) for exhaust gases of an internal combustion engine (1) with an exhaust gas system (5, 8, 9), the temperature of two spatially separate cross-sectional regions in the exhaust gas system is measured by temperature sensors (TF1, TF2; TF1', TF2') and monitored by an electronic monitoring device (10). At least one part of the volume of the catalyst which is essential for the catalytic conversion of noxious substances in the exhaust gas is located between the two measurement points. The temperature sensors (TF1, TF2) do not measure discretely but integrally over a representative portion of the cross-sectional region. The temperature measurement points can be integrated in the catalyst (8), which can also preferably be heated electrically (17, 18). In a properly functioning system, the exothermic reaction in the catalytic conversion of noxious substances in the exhaust gas brings about a certain temperature difference between the two measurement points, which can be monitored. The function of the catalyst (8) and/or engine (1) and/or electronic engine control system (2) can be deduced from the sign and/or absolute value and/or temporal variation of the temperature difference. Preferred field of application: motor vehicles with spark ignition engines with an electronic engine control system.
摘要:
A method and apparatus for monitoring deterioration of an internal combustion engine exhaust gas purifier (7) in which first and second sensors (5, 6) are disposed on the upstream and downstream sides respectively of the purifier (7). The sensors (5, 6) are connected to an electronic control unit (9) which, in normal operation, is arranged to control the air-fuel mixture supplied to each cylinder (101) of the engine (100) by controlling the amount of fuel supplied by an injector (2) so that the air-fuel ratio is a predetermined mean value. The air-fuel ratio is changed from one predetermined value to another predetermined value and delay time taken for the second sensor (6) to change its response subsequent to said change is indicative of the condition of the purifier (7) so that deterioration of the purifier (7) may be readily determined.
摘要:
A method and apparatus for monitoring deterioration of an internal combustion engine exhaust gas purifier (7) in which first and second sensors (5, 6) are disposed on the upstream and downstream sides respectively of the purifier (7). The sensors (5, 6) are connected to an electronic control unit (9) which, in normal operation, is arranged to control the air-fuel mixture supplied to each cylinder (101) of the engine (100) by controlling the amount of fuel supplied by an injector (2) so that the air-fuel ratio is a predetermined mean value. The air-fuel ratio is changed from one predetermined value to another predetermined value and delay time taken for the second sensor (6) to change its response subsequent to said change is indicative of the condition of the purifier (7) so that deterioration of the purifier (7) may be readily determined.