Apparatus and method for diagnosing occurrence of failure in var

Details Apparatus and method for diagnosing occurrence of failure in var Apparatus and method for diagnosing occurrence of failure in var

1995-04-28

1996-08-27

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123198D, F01L 134, F02D 4122

Patent

active

055490808

ABSTRACT:
In a diagnosing apparatus and method for an internal combustion engine having a variable valve timing control system, the apparatus and method diagnose whether the variable valve timing control system actually switches the valve timings according to a switching between an operation and non-operation of the variable valve timing control system, utilizing a variation occurrence in an intake air pulsation in response to the switching between an operation mode and non-operation mode of the variable valve timing control system.

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