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Four-cycle engine

A four-stroke engine, engine technology, applied in engine components, machines/engines, mechanical equipment, etc., can solve problems such as cost increase, and achieve the effects of suppressing deviation, improving exhaust purification performance, and promoting activation

Inactive Publication Date: 2008-05-21
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to realize the fuel injection system, fuel pumps, fuel regulators, controllers, etc. must be added, which increases the cost

Method used

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Examples

Experimental program
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Embodiment Construction

[0024] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0025] FIG. 1 is a schematic diagram for explaining a four-stroke engine according to an embodiment of the present invention according to claims 1, 3 and 4.

[0026] In the figure, reference numeral 1 denotes a four-stroke engine employed in a motorcycle such as a motorcycle or a scooter. The intake passage 2 is connected to an intake port (not shown) of the engine 1, a carburetor serving as a fuel supply system is arranged in the middle of the intake passage 2, and an air filter 4 is connected to the upstream end of the intake passage 2 . The air cleaner 4 is structured such that the interior of the filter case 4 a is divided into an air suction side "a" and an air discharge side "b" by a member 5 .

[0027] The carburetor 3 includes an idling system working in the idling and low-speed driving zones and a main system working in the medium-speed and high-speed...

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PUM

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Abstract

The present invention provides a four-stroke engine. A first catalyst (9) is provided in an exhaust pipe (6), and a second catalyst (10) is provided in the exhaust pipe (6), on the downstream side of the first catalyst (9), with a spacing from the first catalyst (9). A secondary air-introducing pipe (11) for introducing secondary air is connected to a portion between the first and the second catalyst (9, 10), at a position where the difference between the maximum temperatures of the first and the second catalyst (9, 10) in a measurement operation range is within a predetermined temperature range.

Description

technical field [0001] The invention relates to a four-stroke engine, wherein an exhaust pipe is connected to an exhaust port of the engine, a catalyst is arranged in the exhaust pipe and secondary air is introduced. Background technique [0002] Generally speaking, in the relationship between the air-fuel ratio (A / F) of a four-stroke engine and the exhaust composition, such as Figure 15 As shown, the exhaust composition significantly changes with an air-fuel ratio of 14.6 (theoretical air-fuel ratio=stoichiometric ratio) as a boundary. In other words, the emissions of CO and HC are large on the rich side where the air-fuel ratio is larger than the stoichiometric ratio, and small on the lean side. On the other hand, conversely, at close to the stoichiometric ratio, the NOx emission is small on the rich side and large on the lean side. [0003] 11 and 12 show such a conventional engine equipped with an exhaust gas purifier for achieving removal of CO, HC and NOx in the exha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/30F01N3/22F01N3/24
Inventor 西村英浩大场纯一泷井修
Owner YAMAHA MOTOR CO LTD
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