Back to results
US 4,232,640 AGranted
Induction system for an internal combustion engine
AssigneeYamaha Hatsukoko Kabushiki Kaisha
InventorsHiromitsu Matsumoto, Keiichi Sugiyama
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeYamaha Hatsukoko Kabushiki Kaisha
InventorsHiromitsu Matsumoto, Keiichi Sugiyama
Estimating the term…
Several embodiments of internal combustion engines having relatively large main induction passages and relatively small auxiliary induction passages for delivering a charge to the chambers of the engine. Valve means control the proportion of flow to the chambers through the respective passages so that the low and medium charge requirements are supplied primarily by the auxiliary induction passage. This causes improved turbulance in the chamber at the time of combustion and promotes smooth running, good fuel economy and reduction in unwanted exhaust gas constituents. In conjunction with one feature of the invention, means are provided for accelerating the rate of valve movement during the transition from mixture supply from the auxiliary to the main induction passages to improve performance. In accordance with another feature of the invention, an arrangement is provided for permitting compact placement of the control valves.
In an internal combustion engine having a variable volume chamber in which combustion occurs and a main intake passage communicating with said chamber through a main intake port for delivering a charge thereto, an auxiliary intake passage communicating with said chamber through an auxiliary intake port, said auxiliary intake passage having an effective cross-sectional area substantially less than the effective cross-sectional area of said main intake passage for causing a given mass flow of charge through said auxiliary intake port to enter said chamber at a significantly greater velocity, valve means including at least one valve for controlling the ratio of the communication of said ports with said chamber during a given cycle of operation of said engine, and positioning means including an operator controlled element for positioning said valve means in response to the load on the engine for causing substantially all of the idle and partial load charge requirements of the engine to be supplied by said auxiliary intake passage and substantially all of the high load charge requirements by said main intake passage, the improvement comprising said positioning means providing linear movement of the one valve in response to movement of the operator controlled element from idle to off idle operation and non-linear movement of said one valve in response to movement of the operator controlled element during the transition of flow from said auxiliary intake passage to said main intake passage.
In an internal combustion engine having a variable volume chamber in which combustion occurs, a main intake passage communicating with said chamber, an auxiliary intake passage communicating with said chamber, said auxiliary intake passage having an effective cross-sectional area substantially less than the effective cross-sectional area of said main intake passage for causing a given mass flow of charge through said auxiliary intake passage to enter said chamber at a significantly greater velocity, said auxiliary intake passage having its inlet in communication with said main intake passage, a first valve in said main intake passage upstream of said auxiliary intake passage inlet, a second valve in said main intake passage downstream of said first valve and downstream of said auxiliary intake passage inlet for shunting air flow through said auxiliary intake passage when said second valve is closed, manually operable means for positioning said first valve, and means for positioning said second valve, said means for positioning said second valve being effective to provide non-linear movement of said second valve during a phase of its movement from a closed position to an open position in response to movement of said first valve during the transition of flow from said auxiliary intake passage to said main intake passage.
Dependencies are inferred from the claim text.