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GEN
INFO
FEATURES
COMPONENTS
Linear control valve
The linear control valve sends air from the silencer box to the intake manifold to increase the intake
air volume.
The linear control valve consists of a stepper motor that operates the valve, a valve unit that is
attached to the motor, and a main body that distributes the intake air. The stepper motor has been
adopted to deduce malfunctions during operation and for high-precision control. The main body
contains air passages, which are opened and closed by the motor, which operates the valve. In
addition, a pipe to introduce air from the silencer air filter case and air pipes to distribute air to each
cylinder are installed on the linear control valve.
The stepper motor used in the XV1700 rotates exactly 15 degrees per step (1 pulse input). With
each step, the valve moves approximately 0.041 mm. The stepper motor is set to make a total of
146 steps, thus the total range of the valve, from fully closed to fully open, is approximately 6.08
mm.
The linear control valve is operated when the engine is started and adjusts its opening to accommo-
date the temperature of the engine. When the engine is started, the control data transfers from the
engine temperature to the engine oil temperature and adjusts the valve opening to accommodate
the engine oil temperature. When the engine oil temperature reaches 80 °C (176 °F) or higher, the
valve fully closes to stop the intake air volume from increasing.
In addition, the linear control valve fully closes when the main switch is turned off, but maintains its
current position if the engine is stopped with the engine stop switch or if the engine stalls. When the
engine is restarted, control starts at the maintained position.
1
Valve
È
To intake manifold - cylinder #1
É
From silencer air filter case
Ê
To intake manifold - cylinder #2
1
Ê
É
È
