摘要:
An apparatus comprising an internal combustion engine, an exhaust system for conducting exhaust emitted by the engine, and a catalytic device associated with the exhaust system is disclosed, wherein the catalytic device comprises a catalytic conversion portion and a fuel cell portion.
摘要:
In an apparatus having an internal combustion engine, a method of operating the engine including operating the engine at a first non-stoichiometric relative air/fuel ratio for a first duration; operating the engine at a second non-stoichiometric relative air/fuel ratio for a second duration, wherein the second relative air/fuel ratio is on an opposite side of a stoichiometric relative air/fuel ratio as the first relative air/fuel ratio, and wherein the second duration is of sufficient length to allow at least one of one of a substantial saturation of oxygen storage sites in the catalytic device and a substantial regeneration of oxygen storage sites in the catalytic device; and operating the engine at a third non-stoichiometric relative air/fuel ratio for a third duration, wherein the third relative air/fuel ratio is on a same side of the stoichiometric relative air/fuel ratio as the second relative air/fuel ratio and is further from the stoichiometric relative air/fuel ratio than the second relative air/fuel ratio.
摘要:
In an apparatus having an internal combustion engine, a catalytic device for treating emissions from the engine, an upstream oxygen sensor positioned upstream of the catalytic device, a downstream oxygen sensor positioned downstream of the catalytic device, and a controller configured to determine a NOx storage capacity of the catalytic device from a difference between a signal received from the upstream oxygen sensor and a signal received from the downstream oxygen sensor, a method of operating the engine is disclosed, the method including operating the engine at a rich air/fuel ratio for a first interval; adjusting a temperature of the catalytic device to a diagnostic temperature for measuring an oxygen uptake by the catalytic device; operating the engine at a lean air/fuel ratio for a second interval; and adjusting the temperature of the catalytic device to an operating temperature.
摘要:
A microprocessor-based controller is provided for generated heat in at various locations in an exhaust system of an engine by changing the heat generation technique utilized. In one case, some cylinder air-fuel ratios are modulated between stoichiometry and rich, while others are modulated between stoichiometry and lean. Another approach operates some cylinder lean, while others are modulated between a first rich, and a second, less rich, value. Further, compensation based on engine airflow is also provided. Finally, various methods are described for temperature control and for controlling modulation of air-fuel ratio.
摘要:
Disclosed is a method for controlling a lean burn engine coupled to an emission control device that stores oxidants during lean operation, and reacts the stored oxidants during stoichiometric or rich operation, the method comprising estimating amounts of NOx stored in the device along a plurality of axial positions of the device and adjusting an operating parameter based on said estimate.
摘要:
Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.
摘要:
Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.
摘要:
A computer controller is described for disabling fuel injection into cylinder groups of an engine. The system controls engine output a reduced engine torques without reducing engine air amounts below an engine misfire amount by reducing the number of cylinders carrying out combustion. Engine airflow is controlled to maintain accurate torque at requested levels throughout engine operating ranges.
摘要:
A microprocessor-based controller is provided for generated heat in at various locations in an exhaust system of an engine by changing the heat generation technique utilized. In one case, some cylinder air-fuel ratios are modulated between stoichiometry and rich, while others are modulated between stoichiometry and lean. Another approach operates some cylinder lean, while others are modulated between a first rich, and a second, less rich, value. Further, compensation based on engine airflow is also provided. Finally, various methods are described for temperature control and for controlling modulation of air-fuel ratio.