Title:
【発明の名称】燃料噴射系の異常診断装置
Document Type and Number:
Japanese Patent JP2836270
Kind Code:
B2
Abstract:
In an apparatus for diagnosing an abnormality in a fuel injection system in which an injection quantity is feedback-controlled by adjusting a first air-fuel ratio correction value so that an air-fuel ratio is equal to a target air-fuel ratio. The injection quantity is also adjusted by a second air-fuel ratio correction value. When the first air-fuel ratio correction value has reached a first upper limit value, the second air-fuel ratio correction value is set to a second upper limit value. When the first air-fuel ratio correction value has reached a second lower limit value, the second air-fuel ratio correction value is set to a second lower limit value. When the first air-fuel ratio correction value is outside of a predetermined range when a predetermined time has elapsed after the second air-fuel ratio correction value is set to either the second upper limit value or the second lower limit value, it is determined that a fault has occured in the fuel injection system.
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Inventors:
KASHIWANUMA NOBUAKI
Application Number:
JP4382791A
Publication Date:
December 14, 1998
Filing Date:
March 08, 1991
Export Citation:
Assignee:
TOYOTA JIDOSHA KK
International Classes:
F02D41/14; F02D41/22; (IPC1-7): F02D41/14; F02D41/22
Domestic Patent References:
| JP63124848A | ||||
| JP6088834A | ||||
| JP593137A | ||||
| JP4203458A |
Attorney, Agent or Firm:
Tadahiko Ito (2 outside)