Hydrocarbons emission preventive apparatus in intake system for internal combustion engine and method thereof
AssigneesToyoda Boshoku Corporation, Nippon Soken, Inc.
InventorsKouichi Oda, Masaki Takeyama, Naoya Kato, Yoshinori Inuzuka, Takashi Nishimoto
Life of this patent
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Abstract
A throttle valve is opened after stopping an engine to prevent the valve from sticking. Then, when a temperature of the valve has become lower than the polymerization temperature, the valve is closed to seal the vapor of the HCs in a surge tank downstream. Changes in the temperature of the valve are, for example, estimated based on a temperature of an intake air detected by an intake temperature sensor.
Claims21
A hydrocarbon emission prevention apparatus in an intake system of an internal combustion engine, comprising:
- a first throttle valve provided in an intake path of the internal combustion engine;
- and
- a controller that opens the first throttle valve after stopping the internal combustion engine until a predetermined condition is met where no polymerization occurs by the hydrocarbons on at least one of the first throttle valve and the intake path surrounding the first throttle valve and that closes the first throttle valve when the predetermined condition is met.
A method for preventing emission of hydrocarbons in an intake path of an internal combustion engine, comprising:
- opening a throttle valve provided in the intake path after stopping the internal combustion engine;
- keeping the throttle valve open until a predetermined condition is met where no polymerization occurs by the hydrocarbons on at least one of the throttle valve and the intake path surrounding the throttle valve;
- and
- closing the throttle valve when the predetermined condition is met.
Dependencies are inferred from the claim text.