Toyota Camry Hybrid AHV40 Manual page 233

7. VVT-i (Variable Valve Timing-intelligent) System
General
D The VVT-i system is designed to control the intake camshaft within a range of 30_ (of Crankshaft Angle)
to provide valve timing that is optimally suited to the engine condition. This improves torque in all the
speed ranges as well as increasing fuel economy, and reducing exhaust emissions.
D Using the engine speed, intake air volume, throttle position and water temperature, the THS ECU can
calculate optimal valve timing for each driving condition and controls the camshaft timing oil control
valve. In addition, the THS ECU uses signals from the camshaft position sensor and the crankshaft
position sensor to detect the actual valve timing, thus providing feedback control to achieve the target
valve timing.
Crankshaft Position Sensor
Mass Air Flow Meter
Throttle Position Sensor
Engine Coolant Temp. Sensor
Camshaft Position Sensor
Vehicle Speed Signal
ENGINE - 2AZ-FXE ENGINE
Camshaft Position Sensor
Engine Coolant
Temp. Sensor
Crankshaft
Position
Sensor
Camshaft Timing
Oil Control Valve
THS ECU
Target Valve Timing
Correction
Actual Valve Timing
Throttle
Position Sensor
THS ECU
Mass Air Flow Meter Vehicle Speed Signal
Camshaft Timing
Oil Control Valve
Duty-cycle
Control
Feedback
EG-45
DR011EG25
221EG16