System Description

HYBRID TRANSAXLE


MG1 AND MG2 MAIN CONTROL : System Description


GENERAL
- MG1, which is rotated by the engine, generates high voltage (alternating current) in order to operate MG2 and charge the HV battery. Also, it functions as a starter to start the engine.
- MG2 is driven by electrical power from MG1 or HV battery, and generates motive force for the front wheels.
- MG2 generate electricity to charge the HV battery (regenerative brake control) during braking, or when the accelerator pedal is not being depressed.
- The MG ECU, which follows the commands of the hybrid vehicle control ECU, controls MG1 and MG2 via the IPM (Intelligent Power Module), for driving the vehicle. Six IGBTs (Insulated Gate Bipolar Transistors) switch ON and OFF to control the individual motors in accordance with the driving or generation operation.

MOTOR DRIVE OPERATION
- The illustration below describes the basic control for driving a motor. The IGBTs (Insulated Gate Bipolar
Transistors) in the IPM switch ON and OFF to supply a three-phase alternating current to the motor.
- In order to create the motive force required of the motor generator as calculated by the hybrid vehicle control ECU, the MG ECU switches the IGBTs ON and OFF and controls the speed, in order to control the speed of the motor generator.






MOTOR GENERATION OPERATION
The illustration below describes the basic control for the motor to generate electricity. The current that is generated sequentially by the three phases of the motor, which is driven by the wheels, is utilized to charge the
HV battery or drive another motor generator.