Air intake system for engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsIchirou Yoda, Yuuji Oku, Hirokazu Fujita
Life of this patent
Estimating the term…
Abstract
In an intake system for an engine that includes plural throttle bodies 2 to 4 having throttle valves for changing an intake passage area, the plural throttle bodies 2 to 4 include manually driven side throttle bodies 2 to 4, which have manually driven side throttle valves 2b to 4b that are opened and closed by a throttle operation of a rider, and an electrically driven side throttle body 5, which has an electrically driven side throttle valve 5b that is opened and closed by an electric motor 11, and the intake system includes a valve opening control means 15 that controls an opening of the electrically driven side throttle valve 5b such that a specific output characteristic corresponding to an operating state of an engine is obtained.
Claims20
An intake system for an engine, comprising:
- plural throttle bodies constituted by manually driven side throttle bodies having manually driven side throttle valves, which are opened and closed by a throttle operation of a rider;
- an electrically driven side throttle body having an electrically driven side throttle valve, which is opened and closed by an electric motor;
- and
- a valve opening control means for closing an opening of the electrically driven side throttle valve in a manner delayed by a first time constant within a range up to a predetermined regulated opening as the manually driven side throttle valves close.
An intake system for an engine, comprising:
- plural throttle bodies constituted by manually driven side throttle bodies having manually driven side throttle valves, which are opened and closed by a throttle operation of a rider;
- an electrically driven side throttle body having an electrically driven side throttle valve, which is opened and closed by an electric motor;
- and
- a valve opening control means, which controls an opening of the electrically driven side throttle valve such that a specific output characteristic corresponding to an operating state of an engine is obtained, and learns fully-closed positions of the manually driven side throttle valves and the electrically driven side throttle valve to make the fully-closed positions identical with each other when a speed is lower than a predetermined learning time speed and an opening of the manually driven side throttle valves is smaller than a predetermined learning time opening.
An intake system for an engine, comprising:
- plural throttle bodies constituted by manually driven side throttle bodies having manually driven side throttle valves, which are opened and closed by a throttle operation of a rider;
- an electrically driven side throttle body having an electrically driven side throttle valve, which is opened and closed by an electric motor;
- and
- a valve opening control means, which controls an opening of the electrically driven side throttle valve such that a specific output characteristic corresponding to an operating state of an engine is obtained, and includes a mechanical return mechanism that forcibly closes the electrically driven side throttle valve to a predetermined return opening as the manually driven side throttle valves close.
An intake system for an engine, comprising:
- plural throttle bodies constituted by manually driven side throttle bodies having manually driven side throttle valves, which are opened and closed by a throttle operation of a rider;
- an electrically driven side throttle body having an electrically driven side throttle valve, which is opened and closed by an electric motor;
- and
- a valve opening control means that closes the electrically driven side throttle valve in a delayed manner as the manually driven side throttle valves close and changes a delay at a time when the brake is actuated so as to be larger than the delay at a time when the brake is not actuated.
An intake system for an engine, comprising:
- plural throttle bodies constituted by manually driven side throttle bodies having manually driven side throttle valves, which are opened and closed by a throttle operation of a rider;
- an electrically driven side throttle body having an electrically driven side throttle valve, which is opened and closed by an electric motor;
- and
- a valve opening control means that closes the electrically driven side throttle valve in a delayed manner as the manually driven side throttle valves close and temporarily opens the electrically driven side throttle valve to a predetermined shift-down time opening at a time of shifting-down and subsequently closes the electrically driven side throttle valve later than the manually driven side throttle valves.
An intake system for an engine, comprising:
- plural throttle bodies constituted by manually driven side throttle bodies having manually driven side throttle valves, which are opened and closed by a throttle operation of a rider;
- an electrically driven side throttle body having an electrically driven side throttle valve, which is opened and closed by an electric motor;
- and
- a valve opening control means that closes the electrically driven side throttle valve in a manner delayed within a range up to a predetermined regulated opening as the manually driven side throttle valves close.
Dependencies are inferred from the claim text.