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US 2002/0117130 A1Published application
Air-fuel ratio control system for a stratified scavenging two-cycle engine
AssigneeZama Japan Kabushiki Kaisha
InventorMamoru Toda
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AssigneeZama Japan Kabushiki Kaisha
InventorMamoru Toda
Estimating the term…
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.
An air-fuel ratio control system for maintaining at a nearly constant level, the flow rate ratio between the air-fuel mixture and the air to be introduced into the combustion chamber of a stratified scavenging two-cycle engine in which an air-fuel mixture passage having a throttling valve for controlling output is connected to the crankcase, and in which an air passage having an air valve for controlling flow rate is connected to the scavenging passage that connects the aforementioned crankcase to the combustion chamber, wherein
An air-fuel ratio control system for maintaining at a nearly constant level, the flow rate ratio between the air-fuel mixture and the air to be introduced into the combustion chamber of a stratified scavenging two-cycle engine in which an air-fuel mixture passage having a throttling valve for controlling output is connected to the crankcase, and in which an air passage having an air valve for controlling flow rate is connected to the scavenging passage that connects the aforementioned crankcase to the combustion chamber, wherein
Dependencies are inferred from the claim text.