Exhaust purification device for internal combustion engine, and exhaust control device and exhaust control method for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTaiga Hagimoto, Norihisa Nakagawa
Life of this patent
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Abstract
An exhaust purification device includes a front catalyst arranged in an exhaust system of the internal combustion engine that is longitudinally mounted in a vehicle, a rear catalyst arranged in the exhaust system downstream of the front catalyst, and a bypass pipe that communicates with the exhaust passage of the exhaust system upstream of the front catalyst, communicates with the exhaust passage between the front catalyst and the rear catalyst, and is arranged at a position that is spaced apart in a direction perpendicular to the vibration direction of the exhaust system.
Claims12
An exhaust purification device for an internal combustion engine, comprising:
- a front catalyst provided in an exhaust passage of an exhaust system of the internal combustion engine that is longitudinally mounted in a vehicle;
- a rear catalyst arranged in series with the front catalyst, provided in the exhaust passage of the exhaust system downstream of the front catalyst;
- and
- a bypass pipe that communicates with the exhaust passage of the exhaust system upstream of the front catalyst, and communicates with the exhaust passage between the front catalyst and the rear catalyst, wherein
- the bypass pipe is arranged at a position that is spaced apart from the exhaust passage in a direction perpendicular to a vibration direction of the exhaust system that vibrates by a vibration of the internal combustion engine.
An exhaust control device for an internal combustion engine, comprising:
- an exhaust purification device that includes a front catalyst provided in an exhaust system of the internal combustion engine so that gas from the internal combustion engine flows toward the front catalyst from two directions, a rear catalyst provided in the exhaust system downstream of the front catalyst, and an inflow direction switching device that switches a direction of gas flowing into the front catalyst;
- a first gas sensor provided in the exhaust system upstream of the front catalyst;
- a feedback control device that calculates a fuel injection amount of the internal combustion engine based on an output of the first gas sensor;
- a second gas sensor provided in the exhaust system downstream of the front catalyst and upstream of the rear catalyst;
- a sub-feedback control device that corrects the calculated fuel injection amount based on an output of the second gas sensor;
- and
- a first exhaust control device that controls the inflow direction switching device so as to switch the direction of gas flowing into the front catalyst to an opposite direction when the output of the second gas sensor changes from a rich output to a lean output while an air/fuel ratio of the internal combustion engine is feedback controlled by the feedback control device and the sub-feedback control device.
An exhaust control method for an internal combustion engine including:
- an exhaust purification device, which has a front catalyst provided in an exhaust system of the internal combustion engine so that gas from the internal combustion engine flows in from two directions;
- a rear catalyst provided in a portion of the exhaust system downstream of the exhaust system;
- and an inflow direction switching device that switches a direction of gas flowing into the front catalyst;
- a first gas sensor provided upstream of the front catalyst;
- and a second gas sensor provided in the exhaust system between the front catalyst and the rear catalyst, the exhaust control method comprising:
- calculating a fuel injection amount of the internal combustion engine based on an output of the first gas sensor;
- correcting the calculated fuel injection amount based on an output of the second gas sensor;
- and
- controlling the inflow direction switching device to switch the direction of gas flowing into the front catalyst to an opposite direction when an output of the second gas sensor changes from a rich output to a lean output.
Dependencies are inferred from the claim text.