1. Ride by Wire system control (throttle map)
2.
Injection/ignition control
3. System safety checks
1 - Ride by Wire system control
THROTTLE GRIP POSITION SENSOR The throttle grip is the part to which the throttle control cables
arrive; its task is to translate the rider's power request into an electrical signal to be sent to the electronic
control unit. The two throttle cables (opening and closing) actuate on a scroll mounted on a shaft and
which is sent back to its home position by a return spring.
On the shaft covers there are 2 double track potentiometers (4 control tracks) by means of which the
torque demand is read (and checked).
Marelli 7SM electronic control unit Besides the regular control functions of the injection system, it
supervises the throttle bodies: Through the throttle grip position sensor, it reads the torque demand
and, through the THROTTLE MAP, it decides the throttle opening. It checks the correct operation of
each component (Self-diagnosis), of the system (Safety), and carries out the emergency procedure
(Recovery).
Throttle Body The two throttle bodies are made up of:
•
Throttle valve with 2 return springs for the controlled minimum opening position.
•
DC electrical motor
•
Tinned double throttle position sensors with magnetic control (contactless)
The throttle bodies do not require any maintenance and cannot be overhauled. In case of electric or
mechanic malfunction, replace the whole unit.
Pressure sensors The pressure sensors (one per cylinder) are fundamental not only for the injection
map at low and stabilised speeds but also for checking the Ride by Wire system: their signal is connected
to a TORQUE CHAIN for checking the correct opening of the throttle valves.
Intake air temperature sensor The signal coming from the sensor is used to calculate the estimated
torque since the oxygen in the air also depends on its density which varies according to temperature.
2 - Injection/ignition control
Map for injection type (alpha-D)/rpm where:
•
alpha is the throttle position
•
D is the pressure measured at intake ducts
•
At idle and for slow and stabilised speeds D/n
•
For medium-high throttle openings alpha/n
•
For temporary speed (speed change) alpha/n
•
The main parameters that correct the injection map are:
•
Engine temperature
•
Atmospheric pressure (calculated)
•
Lambda probe signal
Power supply DORSODURO 1200 ABS - ATC
P SUPP - 296
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