Intake control system for engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsSeiji Sawai, Kunihiko Nakajima, Jiro Watase
Life of this patent
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Abstract
A number of embodiments of induction systems for internal combustion engines that permit operation on the Miller cycle without introducing pumping losses or by substantially minimizing the pumping losses. Basically, the system provides a variable volume air chamber that supplies the major portion of the intake charge or all of the intake charge under low-speed, low-load conditions. Various valving and variable volume chamber constructions are illustrated. In addition, embodiments using air-assisted fuel injection are also disclosed.
Claims35
An induction system for an internal combustion engine having a combustion chamber with a volume that varies cyclicly during a cycle of engine operating, an intake port for admitting an air charge to said combustion chamber, means for cyclicly opening and closing said intake port for controlling the admission of an air charge to said combustion chamber, means defining an air chamber communicating with said intake port for supplying an air charge to said intake port, means for adjusting the effective volume of said air chamber in response to the operator demand and the load on said engine during at least a range of operation of said engine for controlling the volume of air which is supplied to said combustion chamber from said air chamber during a single intake cycle, and control valve means for communicating atmospheric air to said air chamber during the portion of the engine cycle when said intake port is closed.
An induction system for an internal combustion engine having a combustion chamber with a volume that varies cyclicly during a cycle of engine operating, an intake port for admitting an air charge to said combustion chamber, means for cyclicly opening and closing said intake port for controlling the admission of an air charge to said combustion chamber, means defining an air chamber communicating with said intake port for supplying an air charge to said intake port, means for adjusting the effective volume of said air chamber in response to at least one engine running condition during at least a range of operation of said engine for controlling the volume of air which is supplied to said combustion chamber from said air chamber during a single intake cycle, and control valve means for communicating atmospheric air to said air chamber during the portion of the engine cycle when said intake port is closed, said means for adjusting the effective volume of said air chamber comprising a sliding piston valve movable into a further chamber when in its fully opened position, which further chamber forms an extension of the air chamber only when said sliding piston valve is in its fully opened position.
An induction system for an internal combustion engine having a combustion chamber with a volume that varies cyclicly during a cycle of engine operations, an intake port for admitting an air charge to said combustion chamber, means for cyclicly opening and closing said intake port for controlling the admission of an air charge to said combustion chamber, means defining an air chamber communicating with said intake port for supplying an air charge to said intake port, means for varying the effective volume of said air chamber in response to at least one engine running condition during at least a range of operation of said engine for varying the volume of air which is supplied to said combustion chamber from said air chamber, control valve means for communicating atmospheric air to said air chamber during the portion of the engine cycle when said intake part is closed, and a fuel injector for injecting fuel into said air chamber.
A method of inducting a charge into an internal combustion engine having a combustion chamber with a volume that varies cyclicly during a cycle of engine operation, an intake port for admitting an air charge to the combustion chamber, and means for cyclicly opening and closing said intake port for controlling the admission of an air charge to said combustion chamber, said method comprising the steps of providing a variable volume of air at substantially atmospheric air pressure for supplying an air charge to the intake port, adjusting the effective volume of air supplied in response to the operator demand and the load on the engine during at least a range of operation of the engine for controlling the volume of air that is supplied to the combustion chamber, and communicating atmospheric air to the air chamber during the portion of the engine cycle when the intake port is closed for replenishing an air for the intake port with air at atmospheric pressure.
A method of inducting a charge into an internal combustion engine having a combustion chamber with a volume that varies cyclicly during a cycle of engine operation an intake port for admitting an air charge to the combustion chamber, and means for cyclicly opening and closing said intake port for controlling the admission of an air charge to said combustion chamber, said method comprising the steps of providing a variable volume of air at substantially atmospheric air pressure for supplying an air charge to the intake port, varying the effective volume of air supplied in response to at least one engine running condition during at least a range of operation of the engine for varying the volume of air that is supplied to the combustion chamber, communicating atmospheric air to the air chamber during the portion of the engine cycle when the intake port is closed for replenishing an air for the intake port with air at atmospheric pressure, and injecting fuel into the air chamber.
Dependencies are inferred from the claim text.