Q. Is it really feasible to produce a car that offers advanced performance features while also preserving the environment?
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1 Q. Is it really feasible to produce a car that offers advanced performance features while also preserving the environment? H O W I T W O R K S STARTUP: Only the electric motor is used for startup and low to mid-range speeds. NORMAL: When cruising, the engine and motor both drive the wheels: engine power is split between the wheels and an electric generator, which in turn drives the motor. Power allocation is controlled to maximize efficiency. As necessary, the generator also recharges the battery from surplus engine power. HARD ACCELERATION: The battery supplies additional to boost drive power, while the engine and motor provide smooth acceleration response. DECELERATION/ BRAKING: The high-output motor acts as a high-output generator, driven by the car s wheels. This regenerative braking system recovers kinetic as electrical, which is stored in the high-performance battery.
2 Q. Is it really feasible to produce a car that offers advanced performance features while also preserving the environment? A. YES! Ordinary powertrains waste at stoplights, during braking, and all other times the engine is not running at optimum speed under ideal load conditions. By reducing wastage and applying more efficiently, a hybrid system can simultaneously double fuel economy, slash emissions, provide quiet operation and deliver fun to drive performance. POWER SPLIT DEVICE WHAT IS A HYBRID SYSTEM? The best features of both a gasoline engine and a battery-power system, but only one fuel gasoline. HIGH EXPANSION RATIO ATKINSON CYCLE GASOLINE ENGINE The engine operates at optimum speed for high efficiency. This 1.5-liter engine also extracts more from gasoline combustion by using the high expansion-ratio Atkinson Cycle. A hybrid system combines different power sources to maximize each one s strengths, while compensating for each other s shortcomings. A gasoline-electric hybrid system, for example, combines an internal combustion engine s highspeed power with the clean efficiency and low-speed torque of an electric motor that never needs to be plugged in. GENERATOR To charge the battery and supply power to the highoutput motor, the generator is rotated at up to 10,000 rpm (vs. 6,500rpm in Toyota s first-generation hybrid system). This improves acceleration at low and medium speed. BATTERY The sealed nickel-metal hydride (Ni-MH) battery is more compact and has higher power density than Toyota s first-generation battery. It is charged by the engine via the generator at cruising speed, and by the motor during regenerative braking. New-generation Prius, Japanese-market model This splits power from the engine into two routes: mechanical and electrical. Its planetary gear can transfer power between engine, motor, generator, and wheels in almost any combination. Also called hybrid transaxle. Sun gear (generator) Planetary carrier (engine) Engine Generator Pinion gear Motor Ring gear (motor/ power shaft) Planetary gear MOTOR This permanent-magnet electric motor features neodymium magnets in an optimum V shape, to produce 50kW high output and high torque at 500V, a 1.5 times improvement over Toyota s first-generation hybrid system. REGENERATIVE BRAKING Instead of wasting as heat, this system uses the motor as a generator to convert braking into electricity. It is particularly effective in stop-and-go city driving. Hydraulic braking Brake control ECU VSC, ABS, brake assist Regenerative braking EBC POWER CONTROL UNIT (INVERTER) This contains an inverter that converts DC from the battery into AC for driving the motor. Its high-voltage power circuit raises the power supply to 500V, up from 274V in Toyota s first-generation hybrid system. Differential gear Engine Motor Brake pedal Brake stroke sensor actuator Generator Power split Battery device Power control unit Hybrid vehicle control ECU
3 HYBRID TECHNOLOGY & T oyota is developing and enhancing a wide range of powertrains that run on a variety of power sources. These include lean-burn and direct-injection gasoline engines, common rail direct-injection diesel engines, engines designed to run on alternative fuels, such as CNG and biofuels, pure electric vehicles and vehicles that run on high-pressure hydrogen, such as the Toyota FCHV, a fuel cell hybrid vehicle that began limited sales in December CNG Biofuels Synthetic fuels Alternative fuel engines Alternative fuel HV DPNR Common rail DI Diesel engines Ultimate Eco-Car Hybrid Technology Diesel HV THSII D-4 Plug-in HV Lean burn V V T- i Gasoline engines This is all part of our search for the ultimate eco-car. FCHV CNG: compressed natural gas DPNR: Diesel Particulate - NOx Reduction System THSII: Toyota Hybrid System II D-4: Direct Injection 4-stroke gasoline engine VVT-i: Variable Valve Timing -intelligent FCHV: fuel cell hybrid vehicle EV: electric vehicle DI: direct injection EV Electrical Hybrid technology s potential is becoming clearer by the day. At Toyota, we do not regard hybrid technology as simply a steppingstone to the age of fuel cell vehicles. We see it as the core technology that will become dominant in the eco-car market and eventually evolve to form the basis of what we call the ultimate eco-car. Our engineers may disagree about which fuel or car propulsion system is best. But they do agree that hybrid technology is the core for eco-car development. We develop these key technologies in-house to reduce costs and rapidly commercialize their application. One of the yardsticks to assess the environmental cost of a future technological scenario is well-to-wheel efficiency. This expresses the overall efficiency of an source, from extraction to when it turns a vehicle s wheels. THE ULTIMATE ECO-CAR Well-to-wheel calculations (see-chart) illustrate that, regardless of power source, Toyota s hybrid technologies increase efficiency substantially. A STRATEGY FOR LIFE Hybrid technology is a rediscovery of an strategy that living things depend on. Humans and other animals store temporarily so that they can access it quickly when needed. Like our metabolic system, Toyota s hybrid technology saves fuel by storing and adjusting intelligently to each situation. Energy + ACCELERATION Engine Shut-Off supplementing shortage of storing unused gas/petrol engine operating at maximum efficiency BATTERY Engine Shut-Off recovering regenerated Time - DECELERATION A hybrid battery stores that is ordinarily wasted while driving or stopping, and then applies the stored when starting and to supplement engine power when accelerating.
4 PARALLEL HYBRID: Engine is main way of driving wheels; motor assists for acceleration. SERIES HYBRID: Electric motor drives wheels; engine s only job is to generate electricity. ARE ALL HYBRIDS CREATED EQUAL? Toyota perfected the series/parallel or strong hybrid to deliver the saving benefit of a series hybrid together with the acceleration benefit of a parallel hybrid. Two key technologies the power split device and sophisticated management make this possible. They constantly optimize the flows of mechanical power and electric power for safe and comfortable vehicle operation at the highest possible efficiency. HYBRID SYSTEM COMPARISON SERIES/PARALLEL HYBRID (Prius): Power split device delivers a continuously variable ratio of engine/motor power to wheels. Can run in stealth mode on its stored electricity alone.
5 A MORE POWERFUL SYNERGY In a conventional powertrain, there is a tradeoff between power and efficiency. If you try to raise one, you reduce the other. All things being equal, the larger your engine, the lower your gas mileage. Hybrid Synergy Drive rearranges this relationship. Instead of compromising or sacrificing, it seeks synergies. In the new-generation Prius, Hybrid Synergy Drive achieves a more powerful synergy by boosting the hybrid system s voltage to a maximum of 500V (up from 274V in the first-generation Prius). A higher voltage means that electrical power can be supplied to the motor using a smaller current to increase efficiency. Or, if current is kept the same, the higher voltage can be used to raise power. GOALS ~ of ~ HYBRID SYNERGY DRIVE DEVELOPMENT Objective: Environmental performance without sacrifice Fuel efficiency Driving performance TOYOTA S HYBRID TECHNOLOGY Low emissions Quietness Toyota s hybrid technology simultaneously achieves outstanding environmental performance and driving performance I n developing Hybrid Synergy Drive, Toyota sought to create a new kind of powertrain that would combine the advantages of two kinds of power sources: the electric motor and the gasoline engine. The result is worldclass performance in terms of the fuel efficiency, lowemissions, driving excitement and quiet operation desired in today s motor vehicles. MORE FUN TO DRIVE In addition to its highvoltage power circuit, Hybrid Synergy Drive also employs a higher-performance battery and a higher-speed motor and generator. Together with enhanced management, these enable 1.5 times the motor power of Toyota s first-generation hybrid system, while attaining even greater fuel economy. Side benefits include torque on demand, an innovation that gives added traction on slick roads by taking advantage of the power split device. Fuel Economy (Japanese test cycle) Performance New-Generation Prius with Hybrid Synergy Drive Corolla (1.3 l) Previous Prius Exisiting model Corolla (1.5 l) For the driver, the combination of greater motor power and engine power, plus greater control in Hybrid Synergy Drive provides a more powerful, smoother and safer driving experience. It s a solution whose time has come, just in time. Tradeoff between performance and fuel economy in conventional vehicles 1.8 l gasoline car Camry (2.4 l) (0-100km/h acceleration)
6 HYBRID PAST, PRESENT, FUTURE It has been ten years since the Prius was introduced in As the world s first mass-produced gasoline-electric hybrid passenger car, the Prius proved that people around the world would embrace environmentally-friendly technology. With this encouragement, we are expanding our hybrid lineup to appeal to a broader range of customers. Our Highlander ( Kluger in some areas) Hybrid SUV features a Hybrid Synergy Drive application optimized for the large displacement and output of a V6 engine. It uses a higher-speed 120kW front motor and 50kW rear motor for high torque and high output with a more New-generation Toyota Prius is first to use powerful electrical system. A V6 (3.3-liter) engine using this technology can deliver V8-level Hybrid Synergy Drive. Japanese model, shown here, achieves 35.5km/l* fuel efficiency, more than twice that of a 1.5-liter performance, with fuel efficiency and emissions Corolla, and is fully compliant with Japan s most stringent Ultra-Low Emissions Level at compact car levels, twice as good as those of regulations. an SUV of equal displacement. Our new Camry Hybrid achieves extraordinary fuel economy and outstanding performance, using our Hybrid Synergy Drive system with a First-generation Prius, introduced in 1997, was world s first mass-produced gasoline-electric hybrid car. 2.4-liter Atkinson cycle engine. In 2007, we unveiled the Toyota FT-HS hybrid sports concept, which pairs a powerful V6, 3.5L-engine with a 21st century sports hybrid system. These examples demonstrate how Toyota s Hybrid Synergy Drive technology is robust, powerful and flexible enough to enhance the environmental and driving performance of virtually any type of car, from family sedans to SUVs and sports cars. This is really just the beginning. Hybrid technology will FT-HS hybrid sports concept, shown at 2007 North American International Auto Show. continue to evolve even further. MILESTONES IN TOYOTA HYBRID VEHICLE DEVELOPMENT 1997 Coaster Hybrid Bus* 1997 Prius launched in Japan (2000 in U.S., Europe & other regions) 2001 Estima Hybrid* 2001 Crown Hybrid* 2002 Toyota FCHV (Fuel Cell Hybrid Vehicle) launched in Japan & U.S New-generation Prius 2003 Alphard Hybrid* 2005 Harrier Hybrid* 2005 Highlander (Kluger) Hybrid 2006 Camry Hybrid and more to come. * Only for Japanese market Printed in Japan in March 2007 on recycled paper PR-E-07BC02
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