Chapter 22 Hybrid Drive Systems 427
Figure 22-13. Motor-generator speed sensor uses a small rotor
keyed to the armature shaft to induce current in three pickup
coils. As the armature spins, the sensor sends out an armature
speed signal. This signal allows the ECUs and the power control
module to monitor the motor-generator speed.
Speed Sensor
(Resolver)
Excitation
Coil A
Detection
Coil S
Detection
Coil C
Figure 22-14. Study this parallel hybrid arrangement. Note how
the single motor-generator is located between the engine block
and transaxle. The motor-generator assists the gas engine to
propel the vehicle. The motor-generator can also serve as a
generator to recharge the battery pack. (Honda Motor Co.)
Internal
Combustion
Engine
Motor-Generator
Power Cable
Junction Box
Continuously
Variable
Transaxle
Figure 22-15. Study this series-parallel hybrid confi guration. Notice that the transaxle contains two motor-generators. This design
can operate in the all-electric mode and electric assist mode. 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