Types Of Efi; D-Type Efi - Toyota COMPUTER-CONTROLLED SYSTEM Training Manual

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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
MANIFOLD
PRESSURE SENSOR
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 type
ENGINE ECU
Injection volume control
OHP 4 3
MANIFOLD PRESSURE SENSOR
OHP 43
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 type
AIR FLOW METE R
Injectio n
INJECTOR
Optical Karman vo
rt
ex typ e
Detection of
intake
air volume
OHP 4 3
OHP 4 3
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