VVT – Variable Valve Timing
Typical variable valve timing system is based on PWM controlled solenoid that regulates the oil
pressure applied to an actuator to adjust the camshaft position.
PARAMETER DESCRIPTION
CAM Offset
This parameter is used for camshaft starting position calibration.
The correct value should be chosen to make Cam #1 angle log
channel equal to 0 deg, when the solenoid is not powered
Max. retard / advance Maxim allowable value to retard / advance the camshaft position
Control type
VVTi - control of camshaft position is based on one solenoid.
Dependant of control signal DC (duty cycle) camshaft position
can be advance or retard.
Double Vanos - the control of camshaft position is based on two
solenoids. Each solenoid is responsible for moving the camshaft
position in one direction
Solenoid output #1
Output used for camshaft control solenoid (VVT) or one of the
Double Vanos solenoids
Solenoid output #2 Output used for second camshaft control solenoid of the Double
Vanos system
Output frequency The frequency of signal controlling solenoid
Steady pos DC In the case of VVT system based on one camshaft control
Page 106
EMU
G12
G17
G24
B24
Sample connection of single PWM VVT control solenoid
+12V
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