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:
Jul. 15, 2003
Filed:
Mar. 12, 2002
Mamoru Toda, Iwate-ken, JP;
Zama Japan, , JP;
Abstract
An air-fuel ratio control system for a stratified scavenging two-cycle engine that facilitates the elimination of acceleration failure in the initial stage of acceleration due to the dilution of the air-fuel mixture when scavenging air is introduced. In a preferred embodiment, the control system includes a driving gear and a driven gear that are connected to a carburetor throttling valve for controlling output and an air valve for controlling the flow rate of the scavenging air, respectively. Improved acceleration is achieved by not increasing the amount of air relative to the increasing amount of air-fuel mixture initially being introduced by not engaging the gears until the throttling valve opens slightly from the idling position. When the throttling valve is wide open, the two gears engage with each other, thereby opening the air valve and maintaining a nearly constant flow rate ratio between the air-fuel mixture and the air. Alternatively, the control system may include a driving lever and a driven lever that are connected to a carburetor throttling valve and an air valve for controlling the flow rate of the air-fuel mixture and the scavenging air, respectively.