Toyota Camry Hybrid AHV40 Manual page 14

TH-14
4. Running with MG2 and Engine/(C)
D If the required drive torque increases when running with MG2 only, MG1 is activated to start the engine.
In addition, if any one of the items monitored by the THS ECU such as the SOC condition, the battery
temperature, the engine coolant temperature or the electrical load condition deviates from the specified
level, MG1 is activated to start the engine.
Hybrid
Transaxle
D Only when running with MG2, when the engine starts with MG1, the torque acts on the sun gear (MG1)
in the (+) direction, the carrier (Engine) rotates in the (+) direction in reaction to the torque transmitted
by the sun gear. The ring gear rotates in the (+) direction in reaction to the carrier rotation.
D The nomographic charts and the illustrations of the power split planetary gear unit operation for each
vehicle running condition shown on the following pages represent one situation as an example.
"
Nomographic Chart
Sun Gear
(MG1)
(+)
(-)
"
Condition of Power Split Planetary Gear Unit
Rotational Direction
Torque Condition
THS II (TOYOTA HYBRID SYSTEM II)
Engine
Compound
Gear Unit
MG1
Inverter
MG2
Assembly
Front
Wheel
A
Carrier Ring Gear
(Engine) (Output)
(+) (+)
rpm
0
(-) (-)
02DTH90Y
Sun Gear (MG1)
+
+
: Electrical Path
: Mechanical Power Path
HV
Battery
02HTH12TE
"
Power Split Planetary Gear Unit Operation
Sun Gear
(MG1)
A
Carrier (Engine) Ring Gear (Output)
+
-
A
Carrier
(Engine)
Ring Gear
(Output)
02DTH97Y
+
+