Power-Split Hybrid Transmission

Open Model

This example shows the basic architecture of a power-split hybrid transmission. The planetary gear, along with the motor and generator, acts like a variable ratio gear. In this test, the vehicle accelerates, maintains the faster speed, and then decelerates back to the original speed. The power management strategy uses just stored electrical power to effect the maneuver, the combustion engine only delivering the power required to maintain the original speed.

Losses for the motor, generator, battery and planetary gear are modeled. You can use this system-level model to gain understanding of system performance, and to support design of the power management strategy. The example can be directly compared with the parallel hybrid example ParallelHybridTransmissionExample and the series hybrid example SeriesHybridTransmissionExample.

Model

Simulation Results from Simscape Logging

The plot below shows the flow of power from the engine, motor, and generator as the vehicle accelerates and decelerates. The generator supplies the DC network with a constant flow of power drawn from the engine. The motor draws power from the battery to accelerate the vehicle and then uses regenerative braking to feed that power back to the battery.

The plot below shows the electrical losses from the motor, generator, and battery as the vehicle accelerates and decelerates. The largest losses come from the motor and the battery.