Yamaha Hatsudoki Kabushiki Kaisha

Yoshinobu Yashiro

Yoshiyuki Higaki

Haruhiko Samoto

Hideaki Nagasaka

An internal combustion engine () has an intake pipe () which extends from an internal combustion engine main body () and an intake passageway () formed in the interior thereof communicates with an intake passageway () formed in the internal combustion engine main body (), a fuel supply means () for supplying fuel to the internal combustion engine main body (), an intake negative pressure sensor () for detecting an intake negative pressure (P) in the intake passageway () within the intake pipe (), and a control unit () for controlling the supply of fuel to the internal combustion engine main body () by the fuel supply means () based on a detection signal of the intake negative pressure sensor (). The intake negative pressure sensor () is adapted to detect an intake negative pressure at a downstream end () of the intake passageway () within the intake pipe (). According the intake negative pressure sensor (), the value of the intake negative pressure (P) in the intake passageway () in the internal combustion engine main body () is detected accurately.

Internal combustion engine intake pressure detecting device

A number of embodiments of engine induction system and fuel injection systems for increasing the engine's 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.

Induction system for fuel injected engine

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.

A lubricating oil supplying system for a two cycle engine that includes a reciprocating engine drive lubricant pump and a solenoid controlled bypass valve for selectively delivering lubricant to the engine of by bypassing it back to the inlet side of the lubricant pump to control the amount of lubricant supplied to the engine. The duty cycle of solenoid is increased as the engine speed is decreased and the duty cycle is also decreased when the throttle is opened rapidly so as to insure the proper amount of lubricant flow to the engine under all conditions, both transient and steady state.

Growing community of inventors

Shizuoka-ken, Japan

Yoshinobu Yashiro