Frenos Regenerativos

TOYOTA HYBRID SYSTEM

Contents
Introduction ......................................................................................... 1 What is a Hybrid System ? ................................................................. 2 Three Objectives of THS II Development ........................................... 4 How the THS II System Works........................................................... 5 High-voltage systems—motor and generator ..................................... 6 Power Control Unit, Battery and Regenerative Braking System ........ 8 Hybrid Transmission .......................................................................... 10 Engine ............................................................................................... 12 System Control................................................................................. 14 Output Enhancement ........................................................................ 18 In-house Development and Production ............................................ 19 Specifications of New Hybrid System ............................................... 20

The new Prius features THS II, Toyota’s next-generation hibridtechnology

Introduction
New levels of environmental & power performance compatibility based on the concept of Hybrid Synergy Drive

At the 2003 New York Auto Show, TMC President Cho unveiled the all-new Prius with THS II, a “Hybrid Synergy Drive” concept that delivers both higher power and greater fuel economy than the previous Prius.

In search of the ultimate eco-car
Toyota’s mission hasalways been to provide clean and safe products. Thus, the company has positioned the environment as one of its most important issues and has been working toward creating a prosperous society and a world that is comfortable to live in. With this goal in mind, Toyota has been actively developing various new technologies from the perspective of achieving energy security and diversifying energysources, which is necessitated by the dwindling supply of petroleum resources. For example, in motive power sources for automobiles alone, we have been continuously improving conventional engines and have developed and commercialized lean-burn gasoline engines, direct injection gasoline engines and common rail direct-injection diesel engines, Toyota Hybrid System II (THS II) etc. We have also beenmodifying engines so that they can use alternative fuels, such as compressed natural gas (CNG), instead of gasoline or light oil, and have been installing these engines in commercially sold vehicles. Toyota has also developed and has been marketing electric vehicles (EV) that use motors for the driving source; hybrid vehicles (HV) that combine an engine and a motor, fusing the advantages of these twopower sources; fuel cell hybrid vehicles (FCHV) that use fuel cells (FC) to generate electricity based on a chemical reaction between hydrogen and the oxygen in the air and that supply this electricity to electric motors to produce driving power. In January 1997, Toyota declared the start of the Toyota Eco Project. As part of this effort, Toyota decided to tackle the international challenge ofreducing CO2 emissions in order to prevent global warming and accelerated the development of a hybrid vehicle with the goal of achieving twice the fuel efficiency of conventional vehicles. Then, in March of the same year, Toyota announced the completion of a new power train called the Toyota Hybrid System (THS) for use in passenger vehicles. This power train combines a gasoline engine and an electricmotor, and because it does not require external charging, as do existing electric vehicles, it works within existing infrastructures such as fueling facilities. This system also achieves nearly twice the fuel efficiency of conventional gasoline engines. THS was installed in the passenger vehicle Prius, which was introduced in December 1997 in the Japanese market as the first mass-produced...