Abstract:
Abgasanlage, mit - einem in einer Strömungsrichtung von Abgas durchströmten Abgasrohr, welches eine Rohrwandung aufweist, - einem Flansch, der in der Rohrwandung angeordnet ist und der eine mit einem Innengewinde versehene Durchgangsöffnung aufweist, - einem Gassensor, insbesondere einem Partikelsensor, der dazu vorgesehen ist, die Konzentration von in dem Abgas enthaltenen Rußpartikeln zu sensieren, und der einen mit einem Außengewinde versehenen Gehäusegewindeabschnitt aufweist, welcher in die Durchgangsöffnung eingeschraubt ist, wobei - zwischen einer radialen Außenseite des Gehäusegewindeabschnitts und einem in das Innere des Abgasrohrs ragenden Innenumfangsabschnitt der Durchgangsöffnung einen Ringspalt besteht, wobei - der Flansch ein Strömungsleitelement aufweist, welches sich über einen stromabwärtigen Teil umfang des Gehäusegewindeabschnitts erstreckt und welches dazu vorgesehen ist, eine Umströmung des Gassensors in dem Ringspalt zu begrenzen oder weitgehend zu verhindern.
Abstract:
A control device for an internal combustion engine is provided. The control device includes an electronic control unit. The electronic control unit is configured to set a target air-fuel ratio to a rich air-fuel ratio from a time at which fuel cut control for terminating fuel supply to a combustion chamber during operation of the internal combustion engine is terminated to a time at which an output air-fuel ratio of a downstream-side air-fuel ratio sensor becomes a rich determination air-fuel ratio or lower, temporarily set the target air-fuel ratio to the rich air-fuel ratio after the output air-fuel ratio of the downstream-side air-fuel ratio sensor becomes the rich determination air-fuel ratio or lower, and thereafter set the target air-fuel ratio to a lean air-fuel ratio.
Abstract:
A system comprising an engine and a controller configured to determine an air mass flow command to provide a target air mass flow value to the engine that is based on a base air mass flow value adjusted for engine operating conditions, deviations in the actual torque from a target torque, and corrected for flow conditions.
Abstract:
NO X 吸蔵還元型触媒19の下流側に酸素センサ28を設置したシステムにおいて、酸素センサ28の外部に設けた定電流回路によりセンサ電極間に定電流を流すことで、酸素センサ28の出力特性を変更できるようにする。更に、エンジン11のリーン燃焼制御中には、酸素センサ28のリーン成分に対する検出応答性を高めることで、触媒19の下流側にNO X (リーン成分)が排出されたときに、それを酸素センサ28で早期に検出できようにする。一方、リッチ燃焼制御中には、酸素センサ28のリッチ成分に対する検出応答性を高めることで、触媒19の下流側にHCやCO(リッチ成分)が排出されたときに、それを酸素センサ28で早期に検出できるようにする。
Abstract:
To meet stringent emission standards and improve performance of two-stroke crankcase- scavenged engines, the muffler (13) of the engine is provided with mixing means (130, 31) for mixing the exhaust gases (42) resulting from the mixture participating in combustion and gases resulting from scavenging, so that a substantially homogenous gaseous mixture is formed within the muffler (13), and means (81) for sensing oxygen concentration is located in the homogeneous gaseous mixture and are configured to provide an output value to a control unit (80) for controlling supply of fuel to the engine and thereby the air-fuel ratio in the combustion chamber (41). The muffler (13) suitably is provided with a catalytic element (140), preferably a three-way catalyst. The engine (1) preferably is a stratified charge engine.
Abstract:
Fuel reforming catalysts 28 generate a hydrogen-containing reformed gas when they come into contact with exhaust gas that contains a reforming fuel. Upstream and downstream air-fuel ratio sensors 58, 60 are respectively installed upstream and downstream of the fuel reforming catalysts 28. The upstream air-fuel ratio sensor 58 outputs a upstream sensor signal in accordance with oxygen concentration. The downstream air-fuel ratio sensor 60 outputs a downstream sensor signal in accordance with oxygen concentration and hydrogen concentration by using zirconia's oxygen detection capability and a change of a diffusion layer's hydrogen-concentration-dependent oxygen detection capability. An ECU 50 detects the hydrogen concentration without being affected by the oxygen concentration through the use of the upstream sensor signal in which only the oxygen concentration is reflected and the downstream sensor signal in which the oxygen concentration and hydrogen concentration are reflected. This makes it possible to establish a hydrogen concentration detection system with the common air-fuel ratio sensors 58, 60.
Abstract:
Internal combustion engine (1) provided with a plurality of cylinders (2) divided into a first group and a second group; a control unit '(16) for deactivating all the cylinders (2) of the second group; a first exhaust conduit (7a) and a second exhaust conduit (7b) , which are reciprocally connected at an intersection (17) and which are respectively connected to cylinders (2) of the first group and to cylinders (2) of the second group; a catalyser (19), which is arranged along the first exhaust conduit (7a) upstream of the intersection (17) and is provided with first sensors (20) for detecting the exhaust gases; and a second catalyser (21) , which is arranged downstream of the intersection (17) and is provided with second sensors (22) for detecting the exhaust gas composition.