Exhaust system for variable cylinder engine
First Claim
1. An exhaust system for a variable cylinder engine comprising:
- a variable cylinder engine having an activation cylinder group operating normally and a deactivation cylinder group wherein a fuel supply is stopped under a particular condition;
an activation side exhaust pipe connected to the activation cylinder group;
a deactivation side exhaust pipe connected to the deactivation cylinder group;
a gathering section connected to downstream ends of the activation side exhaust pipe and the deactivation side exhaust pipe;
a sub-catalyst disposed in the activation side exhaust pipe; and
a main catalyst disposed at the gathering section, wherein;
the main catalyst is formed such that gas passing therethrough is partitioned into flows independent of each other in a flow path direction;
the activation side exhaust pipe and the deactivation side exhaust pipe are connected in a mutually independent state to the main catalyst;
said sub-catalyst includes an external cylinder member configuring a shell thereof; and
a downstream end of the external cylinder member abuts with an upstream end of the main catalyst.
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Accused Products
Abstract
An exhaust system for a variable cylinder engine for assuring purification of exhaust gas without increasing the number of catalysts and an intake system for purifying blow-by gas. The exhaust system includes an activation side exhaust pipe connected to an activation cylinder group that operates normally. A deactivation side exhaust pipe is connected to a deactivation cylinder group wherein fuel supply is stopped under a particular condition. A gathering section is connected to downstream ends of the activation side exhaust pipe and the deactivation side exhaust pipe with a sub-catalyst disposed in the activation side exhaust pipe and a main catalyst disposed at the gathering section. The main catalyst is formed wherein gas passing therethrough is partitioned into flows independent of each other in a flow path direction. The activation side exhaust pipe and the deactivation side exhaust pipe are connected in a mutually independent state to the main catalyst.
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Citations
8 Claims
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1. An exhaust system for a variable cylinder engine comprising:
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a variable cylinder engine having an activation cylinder group operating normally and a deactivation cylinder group wherein a fuel supply is stopped under a particular condition; an activation side exhaust pipe connected to the activation cylinder group; a deactivation side exhaust pipe connected to the deactivation cylinder group; a gathering section connected to downstream ends of the activation side exhaust pipe and the deactivation side exhaust pipe; a sub-catalyst disposed in the activation side exhaust pipe; and a main catalyst disposed at the gathering section, wherein; the main catalyst is formed such that gas passing therethrough is partitioned into flows independent of each other in a flow path direction; the activation side exhaust pipe and the deactivation side exhaust pipe are connected in a mutually independent state to the main catalyst; said sub-catalyst includes an external cylinder member configuring a shell thereof; and a downstream end of the external cylinder member abuts with an upstream end of the main catalyst. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification