Title:
COMBUSTION CONDITION DETECTING DEVICE FOR GASOLINE ENGINE
Document Type and Number:
Japanese Patent JP2525979
Kind Code:
B2
Abstract:
PURPOSE: To purify exhaust by detecting density of an ion current, flowing in a spark plug, to perform operation in a condition approximate to a limit of stable operation.
CONSTITUTION: A primary circuit 11 of an ignition coil 1 is connected to a primary current interrupting means 4. A secondary circuit 12 is connected to spark plugs 3 through a distributor 2. The primary current interrupting means 4 concurrently serves for a generating means of ion current detection. In a limit operation condition of a lean limit of air-fuel ratio or a limit of an exhaust gas recirculation(EGR) amount, the nearer density of an ion current, flowing in the spark plug, approaches the limit the larger unevenness increases. A level of this unevenness is measured, and the limit of stable operation is detected from this level to control the air-fuel ratio or the EGR amount so as to approach the limit capable of performing stable operation. Thus, purification of exhaust and improvement of fuel consumption are contrived.
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Inventors:
Shigeru Miyata
Shuji Yoshida
Yoshihiro Matsubara
Yasuo Ito
Shuji Yoshida
Yoshihiro Matsubara
Yasuo Ito
Application Number:
JP32613891A
Publication Date:
August 21, 1996
Filing Date:
December 10, 1991
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
F02D45/00; F02P15/00; F02P17/00; F02P17/12; G01M15/00; G01M15/04; (IPC1-7): F02P17/12; F02D45/00; G01M15/00
Attorney, Agent or Firm:
Kenji Ishiguro
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