Pajero II Technical Information Manual 1991 · PYJE9002 PAJERO 91 TIM 1 · страница 24 из 71 · Открыть оригинал PDF ↗

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If a vortex generation column is placed in thepathof
the air flow, regular vortexes are generated down-
stream alternately. This is called the Karman vortex
lineandthenumberofvortexesgeneratedis
proportional to the air flow speed, in other words
theamount of air flow.
Ifa vortex pressure inlet is made downstream of the
vortexandthede-
generatingcolumnpressure
tected,this pressure varies eachtime the vortex
passes the inlet and when the number of vortexes
increases, the number of pressure variations also

increases in proportion to this.In other wordsthe
frequency of the pressure variations is proportional
to the amount of air flowThe pressure detection
type AFS is different from the conventional ultraso-
nic detection type AFS, and it detects the pressure
variations due to the Karman vortex usinga semi-
conductor type pressure sensor.The AFS changes
the pressure variations to a square wave and inputs
it aspulse signal proportional to the amount of
intake air flowto the engine control unit:

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