Toyota COMPUTER-CONTROLLED SYSTEM - Types of Efi; D-Type EFI

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TYPES OF EFI
EFI - Types of EF I
EFI systems can be divided into two types
according to the method used to sense the
volume of intake air :
1 . D-TYPE EFI (MANIFOLD PRESSURE
CONTROL TYPE )
This type measures the strength of the vacuum
in the intake manifold, thereby sensing the
volume of air by its density .
Ai r
INTAKE MANIFOL D
MANIFOL D
PRESSURE SENSO R
1
I/ F
i
Detection
of intake
manifold
pressure
ENGIN E
Engine spee d
I
Fuel
AIR FLOW METE R
INTAKE MANIFOL D
ENGIN E
Engine spee d
ENGINE ECU
Injectio n
INJECTO R
Injection volume &--
Fuel
control
OHP 4
3
Vane typ e
ENGINE ECU
Injection volume control
OHP 4
3
MANIFOLD PRESSURE SENSOR
OHP 4 3
2
. L-TYPE EFI (AIR FLOW CONTROL
TYPE
)
This type directly senses the amount of air
flowing into the intake manifold by means of an
air flow meter .
Hot-wire typ e
AIR FLOW METE R
Injectio
n
INJECTOR
Optical Karman vo rt ex typ e
Detection of
intak e
air volume
OHP 4 3
OHP 4 3
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