Engine oxygen concentration sensor mounting structure
First Claim
1. An engine oxygen concentration sensor mounting structure in which, for each inline bank of cylinders in an engine, an oxygen concentration sensor is mounted in a collector exhaust pipe connected to an outlet of an exhaust manifold, said exhaust manifold comprising a plurality of exhaust single pipes which include ones of different lengths and converge into the collector exhaust pipe,wherein the oxygen concentration sensor is mounted in a curve of the collector exhaust pipe extending to the outlet of the exhaust manifold, the curve of the collector exhaust pipe being positioned immediately downstream of the outlet of the exhaust manifold, and when a straight line is drawn from a detection part of the oxygen concentration sensor positioned within the collector exhaust pipe so as to be parallel to a section of a centerline of the collector exhaust pipe closest to the detection part, the straight line passes outside the outlet of the exhaust manifold, and wherein the engine is mounted in a vehicle, an exhaust gas catalytic purification device is connected to the collector exhaust pipe, and the oxygen concentration sensor is disposed in a position upstream of the exhaust gas catalytic purification device in a passage of air generated when the vehicle is traveling.
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Accused Products
Abstract
An engine oxygen concentration sensor mounting structure in which an oxygen concentration sensor is mounted in a collector exhaust pipe connected to an outlet of an exhaust manifold having a plurality of exhaust single pipes. When a straight line is drawn from a detection part of the oxygen concentration sensor positioned within the collector exhaust pipe so as to be parallel to a section of a centerline of the exhaust pipe closest to the detection part, the straight line passes outside the outlet of the exhaust manifold. This allows the exhaust gases discharged from the exhaust manifold to be sufficiently mixed within the curved exhaust pipe and differences in length of the plurality of the exhaust single pipes to be compensated for. Thus, accurate detection by the oxygen concentration sensor can be secured, even if the lengths of a plurality of exhaust single pipes of the exhaust manifold are nonuniform.
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Citations
3 Claims
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1. An engine oxygen concentration sensor mounting structure in which, for each inline bank of cylinders in an engine, an oxygen concentration sensor is mounted in a collector exhaust pipe connected to an outlet of an exhaust manifold, said exhaust manifold comprising a plurality of exhaust single pipes which include ones of different lengths and converge into the collector exhaust pipe,
wherein the oxygen concentration sensor is mounted in a curve of the collector exhaust pipe extending to the outlet of the exhaust manifold, the curve of the collector exhaust pipe being positioned immediately downstream of the outlet of the exhaust manifold, and when a straight line is drawn from a detection part of the oxygen concentration sensor positioned within the collector exhaust pipe so as to be parallel to a section of a centerline of the collector exhaust pipe closest to the detection part, the straight line passes outside the outlet of the exhaust manifold, and wherein the engine is mounted in a vehicle, an exhaust gas catalytic purification device is connected to the collector exhaust pipe, and the oxygen concentration sensor is disposed in a position upstream of the exhaust gas catalytic purification device in a passage of air generated when the vehicle is traveling.
Specification