Exhaust promotion device, and exhaust system improvement method for internal combustion engine
AssigneeKokusho Co., Ltd.
InventorKazuo OGATA
Life of this patent
Estimating the term…
Abstract
A problem to be solved is to provide an exhaust promotion method, an exhaust promotion device, and an exhaust system improvement method for an internal combustion engine capable of further improving the exhaust efficiency by high-speed exhaust of exhaust gas. What is characteristic is that an exhaust gas discharged from the internal combustion engine is expanded in multiple stages repeatedly to reduce a temperature thereof, and thus exhaustion is performed while suppressing a behavior derived from a thermal energy of the exhaust gas.
Claims15
1-16. (canceled)
An exhaust promotion device for an internal combustion engine for improving an exhaust efficiency of a combustion gas discharged from an internal combustion engine, the exhaust promotion device comprising:
- a casing provided in an exhaust system of the internal combustion engine
- an exhaust flow control cylinder concentrically provided in the casing so as to form an annular space portion between the inner surface of the casing and the exhaust flow control cylinder;
- and
- a cooling cylinder coaxial with the casing and provided to an end portion of the casing on the exhaust downstream side at an interval with respect to the exhaust flow control cylinder in an exhaust direction, wherein
- the exhaust flow control cylinder has a first expansion portion having an approximate truncated cone cross section that gradually expands in diameter toward a downstream side of an exhaust flow, and an acceleration portion continuously provided with the first expansion portion and having an approximate truncated cone cross section that gradually contracts in diameter toward the downstream side of exhaust,
- a diversion hole through which the acceleration portion and the space portion communicate is provided in a connecting portion of the acceleration portion to the first expansion portion,
- the space portion is a second expansion portion whose capacity gradually increases toward the downstream side of the exhaust, and has, at an end portion thereof on the downstream side of the exhaust, a throttle facing an end portion of the acceleration portion on the downstream side of the exhaust, and
- a capacity of the space portion is set to be larger than a capacity of the acceleration portion.
A method for improving an exhaust system of an internal combustion engine equipped with the exhaust system that purifies an exhaust gas with a catalyst device, the method comprising:
- a step of providing an exhaust promotion device at an exhaust end portion of the exhaust system;
- and
- an engine driving step of driving the internal combustion engine, wherein
- in the engine driving step, the exhaust system including the catalyst device is cleaned by driving the internal combustion engine for a required time.
Dependencies are inferred from the claim text.