Yamaha Hatsudoki Kabushiki Kaisha

Kosei Maebashi

Hiroshi Kawamura

Jun Taue

Takeshi Ito

Haruhiko Samoto

Hirokazu Fujita

Harutomo Tozuka

Junichi Kimura

Tetsuhiko Nishimura

A straddled vehicle includes a gear position sensor abnormality detector which is configured to detect an abnormality of a gear position sensor which is provided at a crankshaft-supporter-integrated transmission supporter. The gear position sensor abnormality detector determines that the gear position sensor has an abnormality when the shift of a straddled vehicle from a stopped state to a running state is detected based on a signal from a rotation speed sensor while the gear position detected by the gear position sensor is included in a high-speed gear position class. Furthermore, the gear position sensor abnormality detector determines that the gear position sensor has an abnormality when the gear position detected by the gear position sensor is included in a low-speed gear position class and is different from a gear position estimated based on a signal from a crankshaft sensor and a signal from the rotation speed sensor.

Straddled vehicle

A control system and method for a multi-combustion chamber internal combustion engine. Balance running between the combustion chambers is achieved by varying the engine operating parameters or the parameters of a load driven by the engine. In addition, knocking can be detected and corrected by also sensing the rate of acceleration of the engine output shaft at certain crank angles.

Multiple cylinder engine control

The fuel injected two-cycle internal combustion engine having an exhaust control valve and direct cylinder injection. The fuel injection timing and duration are increased at starting over idle and the exhaust control valve, which is normally closed at idle and opened at high speed is moved to its high speed condition during starting to assist in starting. In addition, when the engine is returned to an idle condition after racing, the engine idle speed is reduced in steps to prevent stalling and improve return to idle.

Combustion control system for in-cylinder injection type two-cycle engine

A fuel injection system for an engine and method of operating it wherein a rapid and smooth return to normal idle speed is accomplished when the engine has been running at a high speed condition and the throttle is rapidly closed. This is accomplished by setting the injection timing to achieve an idle speed lower than normal idle speed and when this lower than normal idle speed is reached, then the injection timing is set back to normal injection timing for the desired or normal idle speed.

Growing community of inventors

Iwata, Japan

Kosei Maebashi