Title:
VARIABLE VALVE TIMING CONTROLLER FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3692848
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To avoid false determination of transient behavior of a cam shaft phase just after lock release as abnormal.
SOLUTION: In this controller, when lock release is detected, a time counter counts a lapsed time C2 after the lock release detection, and an abnormality decision condition is relaxed until the lapsed time C2 after the lock release detection exceeds a prescribed time γ. Then, the abnormality decision condition is reset to a normal value when the lapsed time C2 after the lock release detection exceeds the prescribed time γ. Because the abnormality decision condition is relaxed until the lapsed time C2 after the lock release detection exceeds the prescribed time γ, the false determination of transient behavior of a cam shaft phase just after the lock release as abnormal can be avoided. Because an abnormality determination process can be continued under the relaxed abnormality determination condition even just after the lock release, abnormality can be early detected if the abnormality occurs. Thus, the early detection and false detection prevention of the abnormality can be compatible.
Inventors:
Masami Inoue
Osamu Sato
Osamu Sato
Application Number:
JP23043099A
Publication Date:
September 07, 2005
Filing Date:
August 17, 1999
Export Citation:
Assignee:
株式会社デンソー
International Classes:
F01L1/34; F02D13/02; (IPC1-7): F02D13/02; F01L1/34
Domestic Patent References:
| JP11210424A | ||||
| JP7127407A | ||||
| JP11044226A |
Attorney, Agent or Firm:
Muneo Kako