The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1999
Filed:
Apr. 01, 1998
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
The expected performance of a jet-propelled boat is maintained, exhaust control valves are controlled and driven in an improved accuracy on the basis of the traveling speed of the jet-propelled boat. Thus, the fuel consumption is improved and the exhaust gas is purified. A two-stroke cycle engine drives a jet propulsion unit to make the jet propulsion unit suck in water and jet water therefrom to propel a hull of the boat. An exhaust control valve is disposed near the exhaust port of the engine to change the opening ratio of the exhaust port according to the operating condition of the engine. A driving mechanism for driving the exhaust control valve includes a hydraulic actuator. The power of water jetted by the jet propulsion unit represents the traveling speed of the jet-propelled boat accurately. The exhaust control valve is driven for opening and closing according to the pressure of water jetted by the jet propulsion unit to achieve the optimum exhaust control by the exhaust control valve without entailing an excessive increase in the output of the engine.