430 Auto Electricity and Electronics
Figure 22-19. This all-wheel drive hybrid drive train uses two motor-generators in the transaxle and a third motor-generator in the
rear drive axle assembly.
Inverter
HV
Battery
Hybrid
Transaxle
Compound
Gear Unit
Engine
Motor-Generator 1
Motor-Generator 2 Motor-Generator 3
Rear
Transaxle
Figure 22-18. 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
Warning: Never come into contact with the
orange hybrid drive cables. Many hybrid
power trains operate on up to 600 volts. The
hybrid drive cables carry this high voltage through
the electric drive system. Always wear thick rubber
gloves and use high-voltage test equipment when
working on an electric drive system to protect
yourself from electric shock or electrocution, and
also to protect the equipment from damage.
Large eye connectors are soldered to each end of the
power cables. This allows the cables to be bolted to the power
control module and to the motor-generator assembly.
Some high-performance hybrid drive cables are larger
than 12-volt battery cables, for example No. 00 (double
ought) and No. 000 (triple ought).
Hybrid Power Control Module
The hybrid power control module is a set of electronic
circuits for altering and feeding current between the HV
battery pack and motor-generator. It controls how much
and what kind of current fl ows through the large power
cables in the electric drive system. The hybrid power con-
trol module can also control the speed and torque of the
motor-generator by varying AC frequency and phase shift.
See Figure 22-21.
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 an
inverter circuit, a converter circuit, and a motor-generator
ECU. Refer to Figure 22-22.