摘要:
An estimated trapped amount (PM) that is an estimated value of an amount of particulate matter that is trapped in a particulate filter arranged in an engine exhaust passage is calculated based on an engine operating state, and PM removal control is performed when the estimated trapped amount exceeds an upper limit amount. Reference temperature increase control is performed to remove the particulate matter from the particulate filter, and an actual temperature that is the temperature of the particulate filter while the reference temperature increase control is being performed is detected. A reference temperature that is the temperature of the particulate filter when it is assumed that the reference temperature increase control has been performed when the amount of particulate matter trapped in the particulate filter is a reference initial trapped amount is stored in advance. The estimated trapped amount is corrected based on the actual temperature and the reference temperature.
摘要:
Methods and systems are provided to monitor a quantity relating to particulate mass M in at least one exhaust pipe arranged downstream of a combustion engine. A first determination device determines a reduction Δ of a pressure difference dP over at least one or several particulate filters, arranged downstream of the combustion engine. This reduction Δ is related to a pressure difference dPref over one or more corresponding reference particulate filters. A second determination device determines a quantity related to the particulate mass M, based on the determined reduction Δ of the pressure difference dP and a predetermined correlation between the reduction Δ and the quantity related to the particulate mass M, so that use of soot sensors in the exhaust pipe may be avoided. A comparison device compares the quantity with a defined threshold value Mth and a providing device provides indications related to the comparison.
摘要:
Bereitgestellt wird ein Verfahren zum Bestimmen einer Gaseigenschaft (37) eines Gases (19,20,29) einer Verbrennungskraftmaschine (5), wobei das Verfahren folgende Schritte aufweist: Zuführen des Gases (19) in eine Elektromaschine (21); Bestimmen einer elektrischen Leistung (P elektr ) der Elektromaschine (21); und Bestimmen der Gaseigenschaft (T, 37) basierend auf der bestimmten elektrischen Leistung (P elektr ).
摘要:
An abnormality in an exhaust system component disposed at the downstream side of a particulate filter (4) is determined by using a differential pressure sensor (5) for measuring a differential pressure between a pressure of exhaust gas at the upstream side of the particulate filter (4) and an atmospheric pressure. In an abnormality determination system for an exhaust device according to the present disclosure, a differential pressure at a second flow rate of the exhaust gas different from a first flow rate of the exhaust gas is estimated based on a first actual differential pressure which is a differential pressure measured by the differential pressure sensor (5) and the first flow rate of the exhaust gas which is a flow rate of the exhaust gas at the time when the first actual differential pressure is measured, and when a difference between a second actual differential pressure, which is measured by the differential pressure sensor (5) at the time when the actual flow rate of the exhaust gas is the second flow rate of the exhaust gas, and an estimated differential pressure is equal to or greater than a predetermined threshold value, a determination is made that the exhaust system component at the downstream side of the particulate filter (4) is abnormal.
摘要:
A reducing agent supplying device includes reaction container (20), ozone generator (30), air pump (30p), ozone-containing air pipe (26), compressed air pipe (25), switching device (25v, 26v), and switching controller (41 a). The reaction container defines a reaction chamber (20a) in which reducing agent is reformed. The ozone generator generates ozone from oxygen in air, being supplied by the air pump. Ozone-containing air flows through the ozone-containing air pipe toward the reaction chamber. A portion of compressed air flows through the compressed air pipe toward the reaction chamber. The switching device switches between an air pump mode, in which the ozone-containing air is supplied into the reaction chamber, and a supercharging mode, in which the compressed air is supplied into the reaction chamber. The switching controller controls the switching device based on a temperature of the reducing catalyst and an exhaust pressure in the exhaust passage.
摘要:
The invention relates to a method pertaining to an SCR system wherein a reducing agent is provided to an exhaust gas stream from an engine (230) for purifying said exhaust gas with respect to among other things content of NOx, wherein said SCR system comprises an SCR catalyst (265) and an upstream of said SCR catalyst (265) arranged and for SCR function coated filter (260), a first dosing unit (250a) for provision of reducing agent being arranged upstream of said filter (260) and a second dosing unit (250b) for provision of reducing agent being arranged upstream of said SCR catalyst (265) and downstream of said filter (260). The method comprises the steps of: - continuously determining a differential pressure (P) over said filter (260); - where applicable, controlling dosing of said first and said second dosing unit (250a, 250b) on the basis of the thus determined differential pressure (P) over said filter (260). The invention relates also to a computer programme product comprising programme code (P) for a computer (200; 210) for implementing a method according to the invention. The invention relates also to an SCR system and a motor vehicle equipped with the SCR system.
摘要:
A thermoelectric generator (13) has a module chamber (32) defined between an exhaust pipe portion (19) and a coolant pipe (23). A thermoelectric conversion module (22) and an HC sensor (35) are located in the module chamber (32). An ECU performs a fault diagnosis on the thermoelectric generator (13) by detecting the leakage of exhaust gas into the module chamber (32) from the exhaust pipe portion (19) based on detection information output by the HC sensor (35).