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Key points of development |
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In the “idling stop system”, the ECU centrally
controls engine operations on the basis of inputs from
various sensors. By precisely controlling revolutions
of the ACG starter, which is directly mounted on the end
of the crankshaft and serves as an ACG (alternator), as
well as a starter motor, the system permits jolt-free
restarting. The speed sensor, thermo-sensor, throttle
sensor, pulse generator, and seat sensor detect conditions
such as stopping of the vehicle, engine temperature, throttle
opening, engine revolutions, seating of the rider, etc.
During cold starts, the ECU automatically stops the engine
when warm, and restarts the engine when the throttle is
opened. It also controls the stand-by indicator lamp that
notifies the rider of the condition of the “idling stop
system”.
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 ”Idling
stop system” configuration |
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Operations of “idling stop system” |
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| Operations
of “idling stop system” |
Additional
functions when “idling stop” occurs/When the
vehicle is in the “idling-stop” condition, the stand-by
indicator blinks to inform the rider that the vehicle
is ready to be started by opening the throttle. A seat
switch, which detects presence of a rider, is used to
prevent unexpected engine starting when no rider is on
the vehicle. The headlamp voltage is also regulated to
reduce electric power consumption. 
The meter for Crea Scoopy-i |
1.When starting the engine (initial
starting) |
| Initially, the rider starts the engine
by pushing the starter button in the same manner as an
ordinary scooter because it sometimes takes several seconds
to start a cold engine after long-term storage or when
the ambient temperature is low. Under these conditions,
the engine continues to idle eventhough the vehicle is
not moving for more than 3 seconds. |
| 2.When engine is warm and/or during
vehicle movement (shifts to the “idling stop”
mode) |
| After initial engine start, vehicle speed
has exceeded 10km/h, and the water temperature sensor
detects a temperature above 50?, by which the ECU judges
that the engine has been warmed up, the system shifts
to the “idling stop” mode from the next stop
of the vehicle. |
| 3.When the vehicle stops moving (“idling
stop” ready) |
| As the vehicle stops with the throttle
fully closed and the rider seated, the ignition is turned
off to stop the engine. The ignition turns off 3 seconds
after the vehicle stops moving. The delayed engine shut-off
allows the rider the ability to make a U turn or a momentary
stop at a stop sign. |
| 4.When restarting ( engine restart and
vehicle movement ) |
| When restarting, the throttle sensor attached
to the carburetor detects an opening of the throttle,
and the system turns on the starter motor as well as allowing
ignition. As the engine starts and the engine speed increases,
the centrifugal clutch engages, thus starting the vehicle
movement. |
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0.9 second from the opening of throttle to the start of vehicle |
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The time period from the opening of throttle
to the start of vehicle is 0.5sec when the engine is idling,
and it is 0.9sec when not idling. Although there is a delay
of 0.4sec, practically the delay in the starting of vehicle
is almost unnoticeable.
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| Time from opening throttle to vehicle movement |
This graph compares the time period from opening throttle to
vehicle movement with and without the engine idling. The time
duration from opening throttle is shown on the horizontal axis,
engine revolutions shown on the left vertical axis, and the
distance of vehicle travel shown on the right vertical axis.
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