Power Control Module
The hybrid power control module consists of a set of
electronic circuits that alter current and route it between
the HV battery pack and motor-generator. It controls how
much and what kind of current flows through the power
cables. The power control module also controls the speed
and torque of the traction motor by varying ac frequency
and phase shift. See Figure 38-15.
The hybrid power control module is often located
next to the battery pack, on the transaxle, or on top of the
engine. The power control module normally contains a
converter circuit, an inverter circuit, and a motor-gener-
ator ECU.
Chapter 38 Hybrid Drive System Operation and Repair 703
Figure 38-11. In this series-parallel hybrid configuration, the transaxle contains two motor-generators.To improve fuel economy, the
gas engine shuts off when braking, when stopped, and when initially accelerating. (Toyota)
Front
motor-generator
windings
Front
motor-generator
rotor
Internal combustion
engine
Rear
motor-generator
windings
Rear
motor-generator
rotor
Figure 38-12. Study the major components of a hybrid transmission for a rear-wheel drive vehicle. (Toyota)
Rotor
Stator
Rotor
Stator
Front motor-generator Rear motor-generator
To
propeller
shaft
Engine
crankshaft