FUEL EVAPORATIVE GAS EMISSION CONTROL DEVICE

• Main Authors: KAMURA HITOSHI, MATSUNAGA HIDEO
• Format: Patent
• Language: English; Japanese
• Published: 25.06.2015
• Subjects: BLASTING; COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

PROBLEM TO BE SOLVED: To determine leakage in a canister.SOLUTION: A fuel evaporative gas emission control device 1 is configured to connect a canister 33 to a purge pipe 31 and a vapor pipe 32 communicating an intake passage 11 of an engine 10 with a fuel tank 21. The fuel evaporative gas emission control device 1 includes: a bypass valve 37 for opening/closing the communication of the purge pipe 31 and the vapor pipe 32 with the canister 33; and an evaporative leak check module 34 having a negative pressure pump for generating negative pressure in the canister 33 and a pressure sensor for detecting internal pressure of the canister 33. When the bypass valve 37 is opened, the negative pressure pump is operated, and the canister internal pressure detected by the pressure sensor is not dropped below reference pressure Pb3, it is determined that there is leakage in the canister 33. 【課題】キャニスタの漏れを判定可能とする。【解決手段】エンジン１０の吸気通路１１と燃料タンク２１とを連通するパージ配管３１及びベーパ配管３２にキャニスタ３３を接続して構成された燃料蒸発ガス排出抑止装置１において、パージ配管３１及びベーパ配管３２とキャニスタ３３との連通を開閉するバイパス弁３７と、キャニスタ３３内に負圧を発生させる負圧ポンプとキャニスタ３３の内圧を検出する圧力センサを有するエバポレーティブリークチェックモジュール３４を備え、バイパス弁３７を閉弁するとともに負圧ポンプを作動させ、圧力センサにより検出したキャニスタ内圧が基準圧Ｐb3を超えて低下しない場合に、キャニスタ３３に漏れがあると判定する。【選択図】図１