Title:
EVAPORATED FUEL SUPPLY CONTROL DEVICE FOR ENGINE
Document Type and Number:
Japanese Patent JP3491331
Kind Code:
B2
Abstract:
PURPOSE: To secure a large amount of purging under a rich condition by reducing an air-fuel ratio under a lean condition compared to the ruch condition where a large amount of evaporated fuel can be purged to an intake system, and setting a large reduction degree under the lean condition compared to that in the rich condition with a low intake amount.
CONSTITUTION: At the time of purge control, purge executing condition is effected in the case that air-fuel ratio feedback control is executed and water temperature in an engine 1 is, for instance, 40°C. Next, it is judged whether or not a lean burn execution condition is effected, which condition is that the engine water temperature is, for instance, 80°C. When the answer is YES, a purge duty (Pduty) is set based on a map of an engine speed and charging efficiency (load). The Pduty is output to a purge solenoid valve 10 for purging evaporated fuel. When the lean burn execution condition is not effected, the Pduty is kept constant. When the purge execution condition is not effected, the Pduty is set zero for closing the purge solenoid valve 10.
Inventors:
Futoshi Nishioka
Michio Matsushima
Hideshi Terao
Yasuyoshi Hori
Michio Matsushima
Hideshi Terao
Yasuyoshi Hori
Application Number:
JP8769894A
Publication Date:
January 26, 2004
Filing Date:
March 31, 1994
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
F02M25/08; F02D41/14; (IPC1-7): F02M25/08; F02D41/14
Domestic Patent References:
| JP63239355A | ||||
| JP4121449A | ||||
| JP5962U |
Attorney, Agent or Firm:
Junichi Shindo