Four Wheel Drive

It seems that every manufacturer has quite a lot of different schemes for providing power to all of the wheels. The language used by the diverse car-makers can sometimes be a little confusing, so before we get started explaining how they work, let's get cleared some terminology. More often than not, when car-makers say that a car have four-wheel drive, they are referring to a part-time system. These systems are destined only for use in low-traction conditions, such as off-road or on snow or ice.

All-Inclusive Automobile

The automobile is one of the most charming devices that a person can own. Automobiles are also one of the most all-encompassing devices, with a typical American family owning two automobiles. An automobile contains dozens of diverse technologies, everything from the engine to the tires is its own unusual universe of design and engineering. There are nearly as many diverse types of four-wheel-drive systems as there are four-wheel-drive vehicles.

Hybrid Mileage Tips

When you are driving along the freeway at 65 mph, your car engine has to give the power to do three things. First is to overcome the aerodynamic drag caused by pushing the car through the air. Then we need to overcome all of the friction in the car's components such as the tires, transmission, axles and brakes. Then the engine has to provide power for accessories like air conditioning, power steering and headlights. For most cars, doing all this requires not as much as 20 horsepower.

Current Standards

The current standards require that the average mileage of all the new cars sold by an auto maker should be 28.5 mpg and that approximates to 8.55 liters per 100 km. This means that if an auto maker sells one hybrid car that gets 65 mpg and that is 3.93 liters per 100 km, it can then sell four big, comfortable cars that only get 20 mpg and that are 11.76 liters per 100 km. You can in fact take steps to drive your car in ways that augment its gas mileage.

Swift Acceleration

A driver's desire for swift acceleration causes our cars to be much less competent than they could be. You may have noticed that a car with a less influential engine gets better gas mileage than an identical car with a more powerful engine. Just look at the window stickers on new cars at a dealership for a city and highway mpg evaluation. The amazing thing is that most of what we require a car to do uses only a diminutive percentage of its horsepower.

Maintain Constant Speed

Each time you speed up the car, you use force, some of which is wasted when you slow the car down again. By maintaining a stable speed, you will make the most efficient use of your fuel. When you stop your car, the electric motor in the hybrid acts like a generator and take some of the power out of the car while slowing it down. If you give the electric motor more time to slow the vehicle, it can recuperate more of the energy. If you stop quickly, the brakes on the car will do most of the work of slowing the car down, and that energy will be exhausted. The same way of thinking applies to gasoline-powered cars as well.

Drive Slow

You can get the unsurpassed mileage from a hybrid car by using the same kind of driving habits that give you better mileage in your gasoline-engine car. The aerodynamic drag on the car increases noticeably the faster you drive. For instance, the drag force at 70 mph and that is 113 kph is about double that at 50 mph and that is 81 kph. So, keeping your speed down can boost your mileage significantly.

California Emission Standards

Let's take the instance of the California emissions standards, which say aloud how much of each type of pollution a car is allowed to emit in California. The amount is more often than not specified in grams per mile (g/mi). For instance, the low emissions vehicle (LEV) standard allows 3.4 g/mi of carbon monoxide. The key thing here is that the quantity of pollution allowed does not depend on the mileage your car gets. But a car that burns twice as much gas to go a mile will generate about twice the pollution. That pollution will have to be reduced by the emissions control equipment on the car. So decreasing the fuel consumption of the car is one of the surest ways to diminish emissions.

Types of Pollutants

Carbon dioxide (CO2) is another category of pollution a car produces. The U.S. government does not normalize it, but scientists suspect that it contributes to global warming. Since it is not regulated, a car has no devices for removing CO2 from the drain. A car that burns twice as much gas adds twice as much CO2 to the environment. Auto makers in the United States have another strong motivation to improve mileage. They are required by law to convene Corporate Average Fuel Economy (CAFE) standards.

The Benefits of a Hybrid Car

The engine doesn't necessitate any more maintenance than the one in any other car, and since both hybrids have regenerative braking, the brake pads may even last a little longer than those in most cars. Achieving hybrid power is surely more complex than using straight gasoline power or straight electric power. You might speculate why anyone would build such a complicated machine when most people are perfectly happy with their gasoline-powered cars. The motive is twofold: to reduce tailpipe emissions and to improve mileage. These goals are in fact tightly interwoven.

Need to Recharge

Like the Insight, the Prius never needs to be repeatedly recharged; the onboard generator mechanically maintains the proper level of charge in the batteries. Both the Honda and the Toyota have extended warranties on their hybrid components. The Insight has an eight-year/90,000-mile warranty on most of the power train, including batteries, and the Prius has an eight-year/110,000-mile warranty on the battery and hybrid systems. The motors and batteries in these cars naturally don't require any maintenance over the life of the vehicle however, if you do have to reinstate the batteries after the warranty expires, it will likely cost you several thousand dollars.

Planet Carrier

When you accelerate, to begin with the electric motor and batteries supply all of the power. The ring gear of the power split device is linked to the electric motor, so it starts to spin with the motor. The planet carrier, which is coupled to the engine, is stationary since the engine is not running. Since the ring gear is spinning, the planets have to spin, which causes the sun gear and generator to rotate. As the car accelerates, the generator spins at doesn't matter what speed it needs to in order for the engine to stay off.

Planetary Gear Set

The power split device is more or less a planetary gear set. The electric motor is linked to the ring gear of the gear set. It is also unswervingly connected to the differential, which drives the wheels. So, no matter what speed the electric motor and ring gear spin at determines the momentum of the car. The generator is connected to the sun gear of the gear set, and the engine is associated to the planet carrier. The speed of the ring gear depends on every three components, so they all have to work mutually at all times to manage the output speed.

Series Hybrid

The power split device in addition allows the car to function like a series hybrid -- the gasoline engine can operate separately of the vehicle speed, charging the batteries or provide power to the wheels as needed. It also acts as an incessantly variable transmission, eliminating the requirement for a manual or automatic transmission. In conclusion, because the power split device allows the generator to start the engine, the car does not require a starter.

The Power Split Device

The electric motor on the Prius is rated at 66 horsepower from 1,250 to 1,540 rpm. It produces 290 pound-feet of torque from 0 to 1,300 rpm, which is more than sufficient to get the car going without the aid of the gasoline engine. The power split device is indeed the heart of the Toyota Prius. This is an intelligent gearbox that hooks the gasoline engine, generator and electric motor together. It allows the car to function like a parallel hybrid, the electric motor can power the car by itself, the gas engine can power the car by itself or they can power the car mutually.

Improved Efficiency

Toyota uses a unique power split device and the Gasoline engines can be tuned to run most competently in certain speed and load ranges. The power split device on the Prius, allows the engine to stay in its most resourceful load and speed range most of the time. Toyota designed the 1.5-liter engine in the Prius to run at a ceiling speed of only 5,100 rpm, where it makes 75 horsepower. Keeping the maximum speed of the engine low allows for the employment of lighter components that improve efficiency.

Power Train

Nothing like Honda, Toyota has focused first and foremost on the power train to attain its emissions and mileage goals. The Prius weighs 1,315 kg and has as a great deal of interior space and trunk space as a Toyota Corolla. The Prius mostly relies on two features to optimize efficiency and reduce emissions. Its engine merely runs at an efficient speed and load and in order to lessen emissions, the Prius can accelerate to a speed of about 16 mph before switching on the gasoline engine.

The Toyota Prius

The Toyota Prius, which was established in Japan at the end of 1997, is designed to lessen emissions in urban areas. To achieve this, Toyota has designed a parallel hybrid power train, called the Toyota Hybrid System that adds some of the profits of a series hybrid. The Prius meets all the requirement of the super ultra low emissions vehicle standard. It is a four-door sedan that seats five, and the power train is competent of accelerating the vehicle to speeds up to 13 mph on electric power alone. This contributes to the enhanced city mileage than highway mileage.

The Clutch

One attractive thing to note is that in the Insight, the manual transmission is separated from the engine and motor by the clutch. This means that if you are the type of driver who wishes to put the clutch in or put the car in neutral when you are dawdling down to a stop, you are not going to get any regenerative braking. In order to pull through energy when you slow down, the car has to be in gear. It is better now to take a look at the technology of the Toyota Prius. The Prius works in a very dissimilar way from the Insight.

Power Generation

The Honda Insight is in fact not very different from a usual car once you get behind the wheel. When you speed up, the gas engine does most of the job. If you accelerate speedily, the electric motor kicks in to provide a little extra power. When you are cruising along the freeway, the gas engine is doing the entire job. When you slow down by hitting the brakes or letting off the gas, the electric motor kicks in to produce a little electricity to charge the batteries. You never have to plug the Insight into an electrical outlet; the motor generates the entire power needed to charge the battery.