Patent•
Exhaust manifold, for internal combustion engine, for improving durability of oxygen sensor at merging portion of exhaust manifold
15 Jun 1998-
TL;DR: In this article, an exhaust manifold comprising a plurality of exhaust pipes and a merging portion applies exhaust gas from each cylinder uniformly to an oxygen sensor in a merging part at low speed.
Abstract: An exhaust manifold comprising a plurality of exhaust pipes and a merging portion applies exhaust gas from each cylinder uniformly to an oxygen sensor in a merging portion at low speed thereby improving the durability of the oxygen sensor. A downstream forward end of each exhaust pipe of the exhaust manifold, when connected to an inlet wall of a merging case having the oxygen sensor mounted on a side thereof, is formed in the shape of a bell mouth for leading the exhaust gas to the oxygen sensor. Each exhaust pipe is fixedly welded to the merging case at a position upstream of the forward end of the bell mouth. An angle formed by lines perpendicular to tangential lines at starting and ending points of a curved portion of the bell mouth at the forward end of the exhaust pipe is set in the range of 45° to 75°. As a result, the bell mouth spreads over the whole interior of the merging case and reduces a flow rate of the exhaust gas, and part of the exhaust gas flows toward the oxygen sensor. The oxygen sensor is thus more evenly exposed to the exhaust gas and has increased durability.
Citations
More filters
•
19 May 1999TL;DR: In this article, a collecting exhaust port 18 provided in a cylinder head 12 is comprised of exhaust port sections 46 extending from exhaust valve bores 35 in cylinders 14, and an exhaust collecting section 47 in which the exhaust ports sections 46 are collected.
Abstract: A collecting exhaust port 18 provided in a cylinder head 12 is comprised of exhaust port sections 46 extending from exhaust valve bores 35 in cylinders 14, and an exhaust collecting section 47 in which the exhaust port sections 46 are collected. The cylinder head 12 includes a protrusion 49 projecting in an arch shape outside a side wall 11 1 of a cylinder block 11. The exhaust collecting section 47 of the collecting exhaust port 18 directly faces an inner surface of a side wall 12 1 of the protrusion 49. Water jackets J2 and J3 for cooling the protrusion 49 are provided in upper and lower surfaces of the protrusion 49 having the collecting exhaust port 18 defined therein. The water jackets J2 and J3 are not provided between the side wall 12 1 of the protrusion 49 and the exhaust collecting section 47. Thus, the compact cylinder head 12 having the collecting exhaust port 18 integrally provided therein can be formed, while avoiding the complication of the structure of a core.
69 citations
•
23 Dec 2002TL;DR: In this paper, an exhaust arrangement for a multi-cylinder internal combustion engine with a row of cylinders (C1-C4) is presented, where an exhaust manifold (2) including a branch portion (8) having a plurality of branch pipes (7A-7D) corresponding to the cylinders, a catalyst (4) disposed downstream of the exhaust manifold, and an exhaust pipe (3) connecting the exhaust manifolds to the catalyst is defined.
Abstract: An exhaust arrangement for a multi-cylinder internal combustion engine (1) of a vehicle which has a row of cylinders (C1-C4). The arrangement includes an exhaust manifold (2) including a branch portion (8) having a plurality of branch pipes (7A-7D) corresponding to the cylinders, a catalyst (4) disposed downstream of the exhaust manifold (2), and an exhaust pipe (3) connecting the exhaust manifold (2) to the catalyst (4). The exhaust pipe (3) defines an exhaust path having a bend (12). The bend (12) includes a plane dividing an interior of the bend (12) into equal halves. A partition (14) divides the exhaust path into first and second exhaust passages (15,16) coextending in a longitudinal direction of the exhaust pipe (3). The partition (14) extends in the bend (12) in alignment with the plane. An oxygen sensor (23) is disposed at the bend (12) of the exhaust pipe (3) in alignment with the partition and projects into both of the first and second exhaust passages (15,16) through a periphery of the partition (14).
29 citations
•
24 Nov 2004
TL;DR: In this paper, an exhaust manifold connected to exhaust ports of at least three straightly-arranged cylinders of an internal combustion engine is constructed by a primary exhaust pipe which extends from the foremost cylinder of the cylinders in the rearward direction of the engine along the direction of a straight arrangement of cylinders.
Abstract: An exhaust manifold connected to exhaust ports of at least three straightly-arranged cylinders of an internal combustion engine is constructed by a primary exhaust pipe which extends from the foremost cylinder of the cylinders in the rearward direction of the engine along the direction of the straight arrangement of the cylinders and a plurality of secondary exhaust pipes which extend from the other cylinders except for the foremost cylinder to the primary exhaust pipe. The secondary exhaust pipes are collected to the primary exhaust pipe so that downstream end portions of the secondary exhaust pipes are wound into the center axis of the primary exhaust pipe at a plurality of points on the center axis, respectively.
27 citations
•
18 May 2006
TL;DR: In this article, a first oxygen sensor (S1) is attached to an exhaust pipe (101) connected to a standard cylinder in which the amount of injected fuel is the closest to the average of the amounts of fuel injected in a plurality of cylinders.
Abstract: In an exhaust system, a first oxygen sensor (S1) is attached to an exhaust pipe (101) connected to a standard cylinder in which the amount of injected fuel is the closest to the average of the amounts of fuel injected in a plurality of cylinders. A controller calculates the air-fuel ratio of the standard cylinder based on the value detected by the first oxygen sensor (S1). Then, based on the difference between the calculated air-fuel ratio of the standard cylinder and a predetermined target air-fuel ratio, the amount of correction to the amount of fuel injected in the standard cylinder is determined such that the air-fuel ratio of the standard cylinder is equal to the target air-fuel ratio. Furthermore, based on the amount of correction to the amount of fuel injected in the standard cylinder, the amounts of correction of the other cylinders are determined.
24 citations
•
06 Dec 2001
TL;DR: In this paper, an air-fuel ratio sensor is installed in position where it can uniformly detect the exhaust gas of each cylinder, and the sensor is arranged such that its detecting part is positioned in the vicinity of the intersection point.
Abstract: An exhaust manifold provides improved output by suppressing exhaust interference between cylinders at the exhaust manifold. An air-fuel ratio sensor is installed in position where it can uniformly detect the exhaust gas of each cylinder. The exhaust manifold has a plurality of exhaust tubes, one per cylinder, that connect with a collector case. Each of exhaust tubes has a linear portion located directly above the section where it merges with the collector case. The exhaust tubes are connected to the collector case such that the center axes of the linear portions intersect at intersection point inside the collector case or downstream thereof. The air-fuel ratio sensor is arranged such that its detecting part is positioned in the vicinity of the intersection point. Depending upon whether the exhaust tubes of cylinders have firing orders that are successive or not determines whether the exhaust tubes are slanted or parallel with respect to each other.
23 citations
References
More filters
•
08 Oct 1982
TL;DR: An exhaust manifold for a multicylinder internal combustion engine which may be an automotive engine as discussed by the authors is of the dual type having a wall formed in the interior to serve as a partition between two separate exhaust gas passages which are communicable with first and second groups of engine cylinders.
Abstract: An exhaust manifold for a multicylinder internal combustion engine which may be an automotive engine. The manifold is of the dual type having a wall formed in the interior to serve as a partition between two separate exhaust gas passages which are communicable with first and second groups of engine cylinders, respectively. To enable installation of an exhaust gas sensor in the manifold, the partition wall has a generally cup-shaped portion which provides therein a chamber to receive the sensitive part of the sensor. The cylindrical side wall of the cup-shaped portion is formed with at least two fairly narrow apertures which provide fluid communication between the inner chamber and the two exhaust gas passages, respectively. In operation, small fractions of the exhaust gases flowing in the two separate passages enter the sensor chamber in the cup-shaped portion of the partition wall to enable detection of an average concentration of a specific component, e.g. oxygen, of the separately flowing exhaust gases without causing substantial mixing or interference of the two exhaust gas flows with each other.
31 citations
•
10 Aug 1984
TL;DR: In this article, a pair of front exhaust pipes are joined to a rear exhaust pipe by an exhaust pipe joint, and downstream end portions projecting into the exhaust manifold are formed annular spaces for receiving reflected waves travelling in the upstream direction and limiting the propagation of the reflected waves into the downstream ends of the front exhaust pipe.
Abstract: A pair of front exhaust pipes are joined to a rear exhaust pipe by an exhaust pipe joint. The front exhaust pipes have downstream end portions projecting into the exhaust pipe joint so that between the outer walls of the downstream end portions and the inner walls of the exhaust pipe joint there are formed annular spaces for receiving reflected waves travelling in the upstream direction and limiting the propagation of the reflected waves into the downstream ends of the front exhaust pipes.
30 citations
•
[...]
TL;DR: In this article, the authors describe a motorcycle with an exhaust system with a sensor in the exhaust system for engine control, which is located so that it will be protected by the exhaust device into which it protrudes and by other portions of the motorcycle.
Abstract: A motorcycle having an exhaust system with a sensor in the exhaust system for engine control. The sensor is located so that it will be protected by the exhaust device into which it protrudes and by other portions of the motorcycle. The exhaust system includes a plurality of exhaust pipes and the exhaust device and one of these exhaust pipes is readily removable from a unitary assembly comprised of the remaining exhaust pipes and exhaust device so that an adjacent component of the motorcycle can be easily serviced.
25 citations
•
21 May 1992TL;DR: The exhaust gases of both cylinder banks of a multi-cylinder reciprocating engine first flow through a catalyst situated along the respective cylinder bank and then, in a cross countercurrent, flow through the horizontally situated muffler arranged transversely to the cylinder banks as discussed by the authors.
Abstract: The exhaust gases of both cylinder banks of a multi-cylinder reciprocating engine first flow through a catalyst situated along the respective cylinder bank and then, in a cross countercurrent, flow through a horizontally situated muffler arranged transversely to the cylinder banks.
15 citations
•
16 Jan 1988
TL;DR: In this article, the authors propose to always give an appropriate irradiating light quantity with high accuracy even if a light source whose pulse light emission time is short is used, by enlarging the pulse width of a pulse light beam, and radiating the light quantity within a prescribed range in one width, onto an irradiated surface.
Abstract: PURPOSE:To always give an appropriate irradiating light quantity with high accuracy even if a light source whose pulse light emission time is short is used, by enlarging the pulse width of a pulse light beam, and radiating the light quantity within a prescribed range in one width, onto an irradiated surface CONSTITUTION:As for a pulse light beam from a light source 1, its pulse width is enlarged a pulse width enlarging means 2, and by an illuminating optical system 4, the pulse light beam is projected onto an irradiated surface 7 through a semi-transmission mirror 5 That is to say, from the time t1, printing is started In such case, as soon as printing is started, the light quantity projected onto the irradiated surface 7 is subjected to integration and by a light quantity detecting means 6, and an output signal is inputted to a light quantity control means 10 It said light quantity becomes predetermined quantity, for instance when it reaches the time t2 in one pulse width, the light quantity control means 10 closes an optical shutter 3 In such way, the control is executed so that the irradiate light quantity to the surface 7 always makes a correct exposure
6 citations