Suzuki Wagon R Manual page 2174

Targeted timing varying operation
DRIVING
CONDITION
Engine running at idle
speed
Average engine load
range
Light engine load
range
Low or average
engine speed range
with heavy engine
load
High engine speed
range with heavy
engine load
Low engine coolant
temperature
At engine starting and
stopping
Timing retarding
When the duty ratio of the signal output from the ECM is light, the
spool valve of the oil control valve moves to the right (head for the
coil). By this spool valve movement, the pressurized oil is led into
the chambers for timing retarding and the oil in the chambers for
timing advancing is drained. This operations actuate the rotor and
result in the retarded timing of the intake valve.
VALVE TIMING
Most retarded
To the advanced side
To the retarded side
To the advanced side
To the retarded side
Most retarded
Most retarded
TARGET OF CONTROL
To shorten the valve opening overlap
in order to prevent the exhaust gas
counterflow to intake manifold.
To lengthen the valve opening over-
lap in order to enhance the internal
exhaust gas recirculation and
reduce the pumping loss.
To shorten the valve opening overlap
in order to prevent the exhaust gas
counterflow to intake manifold.
To advance the closing timing of the
intake valve in order to improve the
volumetric efficiency.
To retard the closing timing of the
intake valve in order to improve the
volumetric efficiency.
To shorten the valve opening overlap
in order to prevent the exhaust gas
counterflow to intake manifold and
reduce the fuel increasing.
To slow the fast idle speed of the
engine as a result of stabilizing the
engine idling.
To shorten the valve opening overlap
in order to prevent the exhaust gas
counterflow to intake manifold.
ENGINE MECHANICAL (M13 ENGINE) 6A2-7
EFFECT
Stabilization of the
engine rotation at idle
speed.
Improvement of the fuel
efficiency.
Lowering of the exhaust
emission.
Keeping of the engine
stability.
Improvement of gener-
ating the engine torque
at low and average
engine speed.
Improvement of gener-
ating the engine power.
Stabilization of the fast
idling of the engine.
Improvement of the fuel
efficiency.
Improvement of start
ability