Patent ID: 6925862
Filing Date: 2005-08-09
Classification: F01N

Abstract:
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.