Patent Number: 6,305,362

Title: Evaporative emission control system for internal combustion engine

Abstract: Disclosed herein is an evaporative emission control system which can properly control the ratio between a tank purge amount and a canister purge amount to realize quick pressure reduction in a fuel tank and ensuring the storage capacity of a canister in a well balanced fashion. A target pressure in controlling the pressure in the fuel tank at a negative pressure and a detected pressure in the fuel tank are compared with each other. When the difference between the target pressure and the detected pressure is large, tank purge is preferentially carried out to open a tank pressure control valve. When the detected pressure is in the vicinity of the target pressure, canister purge is preferentially carried out to purge the evaporative fuel stored in the canister.

Inventors: Kitamura; Toru (Wako, JP), Suzuki; Norio (Wako, JP), Kurokawa; Naohiro (Wako, JP), Ishiguro; Tetsuya (Wako, JP)

Assignee: Honda Giken Kogyo Kabushiki Kaisha

International Classification: F02D 41/00 (20060101); F02M 25/08 (20060101); F02M 037/04 ()

Expiration Date: 10/23/2018