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AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsHideaki Nagasaka, Haruhiko Samoto, Yoshinobu Yashiro, Yoshiyuki Higaki
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A number of embodiments of engine induction system and fuel injection systems for increasing the engines combustion efficiency by maintaining a desired ratio between the intake system volume between the throttle valve and the intake port and the exhaust gas volume. This requires a close positioning of the throttle valve to the combustion chamber, and thus results in quick throttle response. A fuel injection system injects fuel into the intake passage, and a number of embodiments of buffer valves are employed so as to maintain stability in combustion when blipping the throttle under no-load conditions. In addition, arrangements are disclosed wherein separate throttle bodies are employed but that utilize the fuel rail as a means for connecting all of these throttle bodies together to provide a unitary sub-assembly. In addition, an improved throttle position sensor and associated controls are mounted in close proximity to each other on the throttle bodies in many of the embodiments in order to reduce external wiring and improve signal transmission. In addition, the control system employs an arrangement for compensating for a non-linearity in the output of the throttle position sensor.
An induction system for an internal combustion engine having at least a pair of relatively movable components that define a combustion chamber, said induction system supplying a charge to said combustion chamber, said induction system forming an intake passage in which a throttle valve is positioned, said intake passage communicating with said combustion chamber through an intake port, said throttle valve being positioned in close proximity to said intake port and controlling the flow only to said combustion chamber, a fuel injector for injecting fuel directly into said intake passage for only said combustion chamber and a buffer valve in said intake passage and which is opened by the flow therethrough only to said combustion chamber for restricting the air flow upon sudden changes in position in said throttle valve so as to maintain a more uniform air fuel ratio under transient conditions.
An induction system for an internal combustion engine having at least a pair of relatively movable components that define a combustion chamber, said induction system supplying a charge to said combustion chamber, said induction system forming an intake passage in which a throttle valve is positioned, said intake passage communicating with said combustion chamber through an intake port, said throttle valve being positioned in close proximity to said intake port, a fuel injector for injecting fuel directly into said intake passage and a piston type buffer valve in said intake passage and which is opened by the flow therethrough for restricting the air flow upon sudden changes in position in said throttle valve so as to maintain a more uniform air fuel ratio under transient conditions.
Dependencies are inferred from the claim text.