ESA - Functions
of Engine EC
U
The ECU
feeds
back
signals from the knock
TORQUE CONTROL CORRECTIO
N
sensor to correct the ignition timing as shown
below
.
ENGINE
KNOCKING
OCCUR
S
TIMING
ADVANCED
TIMING
RETARDE
D
ENGINE KNOCKING
STOPS
OHP 6
7
Weak Engine knocking Stron
g
OHP 6
7
-RELEVANT SIGNAL -
• Engine knocking (KNK)
In the case of vehicles equipped with the ECT
(electronically-controlled transmission), each
clutch and brake in the planetary gear unit of the
transmission or transaxle generates shock to
some extent during shifting
. In some models,
this shock is minimized by delaying the ignition
timing when gears are up- or down-shifted
.
When gear shifting starts, the Engine ECU
retards the engine ignition timing to reduce the
engine torque
.
As a result, the shock of engagement of the
clutches and brakes of the planetary gear unit is
reduced and the gear shift change is performed
smoothly
.
The ignition timing angle is retarded a maximum
of approximately 200 by this correction
.
This correction is not performed when the
coolant temperature or battery voltage is below
a predetermined level
.
-RELEVANT SIGNALS
• Engine speed (NE
)
• Thro
tt
le position (VTA
)
• Coolant temperature (THW)
• Ba
tt
ery voltage (+B
)
96
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