Resonator for internal combustion engines
AssigneeNippondenso Co., Ltd.
InventorsToshiichi Sawada, Yasuhiko Fukami, Shuzo Kinkori
Life of this patent
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Abstract
A resonator for internal combustion engines, having an enclosed chamber of predetermined volumn connected to an intake duct by a tubular connecting member which is composed of an external member and an internal member. The internal member is disposed within the external member and moved by an actuator which is controlled by an electrical signal corresponding to a resonant frequency calculated by a computer in synchronism with engine rotational speeds. The resonator thereby functions to absorb resonant noises from the engines by appropriately changing the length and/or cross-sectional area of the tubular connecting member.
Claims7
A resonator for an internal combustion engine having conduit means defining a gas flow path to and from a cylinder having a movable piston, this conduit means including an intake pipe leading to the cylinder and an exhaust pipe leading from the cylinder,
- said resonator, comprising:
- wall means defining a closed volume chamber for absorbing noise generated in said engine;
- a tube communicated with said closed volume chamber and being constructed and arranged for communication with at least said intake pipe of one of said pipes intermediate the extent of such pipe, as a branch thereof;
- and
- throttle means variably associated with said tube, this throttle means being constructed and arranged to be moved in relation to at least one operational condition of said engine for correspondingly varying the resonant frequency thereof by substantially varying at least one dimensional factor of said resonator in order to absorb engine noise over a broader range of engine speeds than would result from unvarying communication of said tube with said closed volume chamber and respective said pipe.
Dependencies are inferred from the claim text.