Advancement of Toyota Hybrid System II (THS-II)

Applying size-reducing, weight-reducing and loss-reducing technologies used in the fourth-generation Prius, Toyota has enhanced its hybrid system for 2.5-liter engines and developed the new, high-performance Multistage THS II for rear-wheel-drive vehicles.

New Toyota Hybrid System II for 2.5L Dynamic Force Engine

THS II for 2.5-liter engines excels in both power and fuel-economy performance due to the synergistic effect of size-reducing, weight-reducing and loss-reducing technologies coupled with the high thermal efficiency and output of a new TNGA-based engine.

Combines fuel economy with road performance

New Multi Stage Hybrid SystemWorld's first

Multistage THS II gives hybrid vehicles an all-new driving image with its start-from-stop acceleration performance and abundant direct feel. In addition to improving system efficiency at high speeds, intermittent use of the engine at high speeds has also been made possible, further improving high-speed fuel economy.

Performance

High driving power at the start which exceeds V8 5.0L engine performance with V6 3.5L engine

Quick responding acceleration

Smooth acceleration created with 10-speed A/T simulated control

Improved electrical path efficiency

High power and high fuel economy is achieved at the same time

Details of the new technologies

By adopting the Multi-Stage Shift Device to THS, the engine is able to operate in a wider speed range

With the Multi-Stage Shift Device, both engine torque and MG torque are reinforced.

The system for plugin hybrid vehicles

The system for plugin hybrid vehicles (PHVs) has also been enhanced. A new dual motor drive system allows the electric motor, which was hitherto used only as a generator, to provide direct driving power, resulting in powerful driving, even when in EV mode. Further enhancing the system for PHVs is a large-capacity lithium-ion battery that largely increases the EV-mode cruising range to 60 kilometers or more^*.

Developmental target value (in the JC08 test cycle); measured by Toyota

Significantly extended EV cruising range

A dramatic evolution with the installation of large capacity lithium-ion battery and an efficient PHV system

Fuel efficiency may vary depending the environment (weather traffic congestion etc) and driving style (rapid acceleration air conditioner use etc)

Dual Motor Drive System

On top of the conventional motor used for driving, a generator has been added as a motor to help
achieve powerful EV-mode cruising performance

The battery supplies electric power to the two motors

During normal EV-mode cruising

One-way clutch