摘要:
The invention relates to a method for operating a catalyst (12) that is disposed in the exhaust gas of an internal combustion engine (1). The composition of the exhaust gas is influenced upstream of the catalyst (12) by adding a reducing agent that promotes the regeneration of the catalyst (12). The composition of the exhaust gas is detected by means of a exhaust gas sensor (14) that is disposed downstream of the catalyst (12). A time delay between the start of the influencing action on the composition of the exhaust gas upstream of the catalyst (12) and the detection of a change in composition downstream of the catalyst (12) is evaluated. In order to safely and reliably determine when the regeneration phase (23, 33) of the catalyst (12) is ended, the gradient of a starting signal (31) of the exhaust gas sensor (14) is evaluated.
摘要:
The invention relates to an internal combustion engine, in particular, for a motor vehicle. The internal combustion engine is provided with an accumulator-type catalytic converter into/from which nitrogen oxides can be charged/discharged. A number of aging states (points 13) of the accumulator-type catalytic converter can be determined by the control unit. Said control unit uses the consecutive aging states (points 13) to determine a sulfur content of the fuel used.
摘要:
The invention relates to an internal combustion engine, in particular for a motor vehicle, which is provided with a catalytic converter upon which hydrocarbons can impinge. The conversion capacity of the catalytic converter can be determined by an electronic control device, using a combination of a passive and an active diagnostic procedure (27, 31).
摘要:
A tank ventilation device for motor vehicles with an internal combustion engine fed by a fuel tank (10). Said device comprises a filter element (17) which can be connected to a vent pipe (13) of the fuel tank (10), an air inlet (19), an air outlet (20), and an air pump device (27) for diagnosis of errors. Air pump device (27) is integrated into a pump housing (26) with a pump inlet (29) and a pump outlet (28). In order to obtain a compact design and to save assembly space, the pump housing (26) is placed on the filter housing (17) with a pump outlet (28) which is coaxially oriented with regard to the air inlet (19), and secured to the filter housing (17) by means of elastic fastening elements (43). The junction between the pump outlet (28) and the air inlet (19) is sealed in an airtight manner.
摘要:
The invention concerns a tank-venting arrangement for motor vehicles with an internal combustion engine. The tank-venting arrangement comprises a fuel tank (10) with filler and venting connection pieces (11, 12), a filter (14) for the deposition of the evaporated fuel vapours, a tank-venting valve (17) for metering an air flow flowing through the filter (14) from its inlet (15) to its outlet (16) for the regeneration of the filter, and a diagnostic device (20) connected to the filter inlet (15) to test for leaks. In order to ensure that the regeneration air flow is sufficient even when the internal combustion engine lacks intake power, the feed pump (22) in the diagnostic device (20) is also switched on during the filter-regeneration process. Advantageously, the filter-regeneration air flow is not guided through the flowmeter (25, 26) of the diagnostic device (20) but through a bypass (35) with a controllable by-pass valve (36) which connects the outlet of the feed pump (22) to the inlet (15) of the filter (14).
摘要:
A process for alternating execution of phases with and without tank ventilation during the operation of an internal combustion engine (10) with a tank ventilator (21, 24-26) is characterized in that the ratio of the time-intervals with and without tank ventilation is chosen so that it is dependent on operating data of the engine or of the tank ventilator. Preferably the quantity measured is a measure of the quantity of fuel to be regenerated during tank ventilation, and the above-mentioned ratio is increased with respect to an initial ratio in favour of the tank ventilation time-interval if the value of the measured quantity exceeds an upper limit (Dp-SMW; FTEA-SWU). This process makes it possible to equip the corresponding device with an adsorption filter (24) and a tank ventilation valve (25) for smaller throughputs than hitherto, without the risk of fuel vapours escaping into the atmosphere. If large quantities of fuel vapor are produced, the tank ventilation time-interval is increased with respect to the basic adaptation time-interval. The smaller adsorption filter is therefore still adequately regenerated despite the smaller cross-section of the tank ventilation valve.
摘要:
Procédé pour contrôler le fonctionnement d'un système d'aération de réservoir de carburant pour un véhicule à moteur équipé d'un moteur à combustion interne (10). Le système comprend un filtre à adsorption (14) avec une ouverture d'aération (17) sur son côté aération et un conduit de raccordement (16) conduisant au réservoir (15), ainsi qu'une soupape d'aération de réservoir (13) qui est placée dans un conduit de raccordement (12) entre le collecteur d'admission (11) du moteur et le côté aspiration du filtre à adsorption. Ledit procédé se caractérise en ce qu'une pression différentielle (Dp) qui représente la différence de pression entre les côtés aération et aspiration du filtre à adsorption est mesurée et que le débit du filtre à adsorption est jugé comme étant insatisfaisant si ladite pression différentielle mesurée dépasse une valeur seuil (Dp-SW). Ce procédé, ainsi que des procédés similaires mentionnés dans la description, permet pour la première fois de surveiller le débit d'un filtre à adsorption dans un système d'aération de réservoir de carburant. Si ce procédé est utilisé conjointement à des procédés classiques servant à surveiller, par exemple, l'étanchéité du système ou l'aptitude au fonctionnement de la soupape d'aération du réservoir de carburant, on peut surveiller le fonctionnement général du système d'aération d'une façon encore plus efficace qu'on ne pouvait le faire jusqu'à maintenant.
摘要:
The invention relates to an internal combustion engine (1), especially for a motor vehicle, that is provided with a three-way catalyst (12) that can be impinged upon with nitrogen oxides. The control device (18) is used to switch from a rich-mixture operation to a lean-mixture operation of the internal combustion engine (1). The control device (18) allows an extrapolation from the NOx emissions to the aging of the three-way catalyst (12).
摘要:
The invention relates to a method for operating an internal combustion engine by introducing air. The method is characterised in that air is guided into the intake area after the internal combustion engine has been switched off. Optionally, the inlet valves and the outlet valves of at least one cylinder are arranged in a position wherein the at least one inlet valve and one outlet valve of a combustion chamber of the internal combustion engine are simultaneously opened. One particular advantage of said method is that it can be used with an internal combustion engine provided with an electric turbo charger for introducing the air.
摘要:
The invention relates to an internal combustion engine (1), especially for a motor vehicle, that is provided with a three-way catalyst (12'') and a storage catalyst (12') that can be charged with and discharged from nitrogen oxides. The control device (18) is used to carry out a diagnosis of the storage catalyst (12') below a temperature at which the three-way catalyst (12'') is not yet active.