Archive for March, 2010
Tuesday, March 30th, 2010
Hybrid technology has come a long way since Toyota released the Prius. Sales substantially picked up in the market prompting other automobile companies to make their own hybrids. Following in the footsteps of Toyota in 1997 Honda made its own hybrid. The Honda Insight was a moderate success. Although it was a fuel efficient car it had different technology under the hood. The hybrid technology was new at that time and the public perceived the Insight to look to odd to be driven around the city.
Honda then turned to one of its famous compact sedans. The Honda Civic was released in a hybrid version in 2003. The design was pretty much the same with the conventional Honda Civic incorporated with Honda’s own hybrid technology.
Honda Civic Hybrid
The first generation Honda Civic hybrid came out in 2003. It operates with a different hybrid technology compared to the Toyota Prius which is the basic template for all hybrids. Instead of the hybrid synergy system, the Honda Civic hybrid uses an Integrated Motor Assist system that was also used in the Insight.
The first generation was produced from 2003 to 2005. It has a 1.3 liter lean burn internal combustion engine with Honda’s VTEC cylinder cut-off system. This allows 3 cylinders to stop operating while decelerating which reduces friction losses. This in turn creates a more effective way of regenerating energy. It has a 15 kW permanent magnet motor which also serves a generator for recharging the batteries. It also has a 120 V nickel metal hydride battery, 5 speed manual transmission, regenerative braking, electric power steering, and low rolling resistance tires.
The second generation was also equipped with the same thing with a few changes. A high profile camshaft was added, fourth generation Integrated Motor Assist and third stage VTEC and Variable Cylinder
Management replaced the previous ones. It has a satellite-linked navigation system and an audio system that supports mp3 and WMA. It also comes in with an average fuel consumption regulator. An idle stop feature automatically shuts off the engine in idle periods.
The second generation was also an improvement from the first one which used lean burn engine.
Honda has stopped producing Civic hybrids to replace them with smaller and affordable types to compete with Toyota . Nonetheless previous the second generation proved to be a worthy competitor to the Prius. Although they may differ in terms of technology, fuel efficiency was still attained.
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Tuesday, March 30th, 2010
People may be surprised to know that the idea of electric and hybrid vehicles have been present even before the gasoline engine was invented. A lot of people with their brilliant ideas revolutionized modern transportation as it is today. With the rise of health-threatening pollutants, new age electric and hybrid vehicles are truly becoming a reality.
When Electric Cars Ruled the World
Robert Anderson from Scotland created the first electric carriage during the 1830s. Professor Stratingh of Groningen from Holland designed a simple electric car. Christopher Becker was Stratingh’s assistant who built the model in 1835. In 1842, Thomas Davenport from the United States and Robert Davidson from Scotland built more advanced electric vehicles with the use of non-rechargeable electric cells. Gaston Plante from France improved the storage battery and created a better model in 1865. Sixteen years later, Camille Faure continued to improve the storage battery.
During the late 1800s, several European nations like Great Britain and France began the spread of electric vehicles while constantly innovating for better design and performance. Electric cars did not need gear changes. The United States followed with the creation of electric tricycles. At the turn of the century, electric cars were selling better compared to their gasoline engine counterparts due to less vibration, noise and pollutants. In 1916, Woods invented the first hybrid consisting of an electric motor and combustion engine.
The cost of electric vehicles was somewhat expensive so only the people belonging in the upper class were able to afford them. Prices would reach $2,000 to $3,000 depending on the interior and materials used. Production peak for electric vehicles were from 1910 to 1912. During the 1920s, road systems were significantly improved so people needed vehicles that traveled farther than electric cars.
The price of gasoline also decreased making it more affordable for everyone. Charles Kettering invented the electric starter for gasoline cars taking away the tedious hand crank. Henry Ford and his idea of mass production at lower costs continued to reduce the popularity of electric cars. Gasoline cars at this point were only about one-third the price of an electric vehicle.
Decline and Regrowth
From 1935 to 1960, electric vehicles were slowly fading from the scene. However, people began looking for alternative fueled vehicles in order to solve problems on pollution and the growing price of gasoline. More practical models of electric vehicles were proposed.
A number of actions were also imposed in the United States and across the globe to exert effort in improving electric vehicles. Some great works were the U.S. 1990 Clean Air Act Amendment as well as the U.S. 1992 Energy Policy Act. Other states required vehicles to have zero emission. Some of the largest automobile manufacturers as well as the U.S. Department of Energy collaborated to start making hybrids. Mileage, speed and performance were greatly enhanced in these newer models.
Recent electric and hybrid models are able to generate energy through special energy-converting systems. Hybrid models had special dual engines running on both gasoline and electricity which helped conserve a lot of fuel aside from being environmentally friendly. Sedans, SUVs and trucks were quickly built using the newly discovered technology. The method of running on electricity had various approaches but the main idea of being conservative and green was present in all models.
Hybrids: The Pollution Solution
Gasoline engines were proven to be reliable and powerful. However, the constant burning of gasoline released a variety of harmful gases like carbon dioxide, carbon monoxide, hydrocarbons and nitrogen oxide. These are also known as greenhouse gases which trap heat in the atmosphere instead of allowing it to go out into space. The result would be global warming wherein surface air temperatures and sub-surface temperatures in the ocean would rise.
Although there are also natural causes to global warming, vehicle emission significantly multiplies the rate spurring the creation of alternative fuel sources. Electric and hybrid vehicles have shown to be very promising in reducing the greenhouse effect. Pollution will be minimized greatly if more and more people will start relying on these newer models which do not emit any harmful gas at all. These vehicles are also very economical since there is no longer a need for crude oil which constantly is growing in price.
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Tuesday, March 30th, 2010
Gasoline powered vehicle
As the name implies, a gasoline powered vehicle uses a combustion engine as a source of power. It has a fuel tank that supplies gasoline to the engine which drives the transmission and turns the wheels.
Pros
With a single full tank, a gasoline-powered vehicle can run several times longer than an electric car.
A gallon of gasoline is much denser than batteries in terms of energy. For example, 1 gallon of gasoline (7 pounds) produces the same amount of power as 1000 pounds of batteries.
It can keep up with the traffic on the road.
You have the widest car options. From compact to full-size sedan, from pickup trucks to SUVs, from minivans to luxury cars, you can jump from one car dealer to another and still get the best car varieties.
You can also choose from different types and sizes of engines.
Cons
With the soaring prices of fuel, getting a gas tank full is very expensive. Combustion engine wastes a lot of energy and consumes a lot of fuel. It also emits pollutants that contribute to the depletion of the environment.
Electric vehicle
An electric vehicle has a battery that supplies power to the electric motor, which then drives the transmission and turns the wheels.
Pros
Since it does not consume fuel, an electric vehicle emits no toxic fumes which is good news for the environment.
Although the battery pack is expensive, electric power is cheaper as compared to pump prices.
Cons
The battery can power the car short distances on a single charging.
Batteries of an electric car take several hours to charge.
Electric cars cannot keep up with the traffic.
Its top speed is slower than gasoline cars.
Hybrid Car – Problem solved
Hybrid cars get the best of both engines. It uses both an electric motor and a combustion engine to drive the vehicle. That means that a hybrid can either run on an electric motor and use the advantages of an electric car, or run on a combustion engine and use the edge of a gasoline powered car. Or, it can run on both at the same time. Depending on the type of hybrid car, you can have the best fuel efficiency with a performance similar or even better than its non-hybrid counterpart.
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Tuesday, March 30th, 2010
Hybrid cars were not created equal.
Some produce more power. Some are designed for maximum fuel efficiency. Some are built for city driving; others are made to turn heads. Most have unique features that further improve the quality of driving and fuel economy. When you are shopping for one, take note of the following features.
Regenerative braking system.
In conventional gasoline-powered cars, all the kinetic energy (energy in motion) is lost and wasted during braking. Hybrid cars recapture this kinetic energy through the regenerative braking system back to the battery for future use. The regenerative braking system increases fuel economy and reduces wear to the brakes.
Low-rolling resistance tires.
Tires are often not seen as a major factor in increasing the fuel economy. But in hybrid cars, they use low-rolling resistance tires to improve gas mileage. These stiffer, narrower, and inflated tires reduce the drag against the ground.
Fuel economy.
Not all hybrids are fuel efficient. Some are made to perform. And even if the hybrids are made to get the longest miles out of every gallon of gas, some are still better than others. For example, the Ford Escape Hybrid runs 34 mpg in the city and 30 mpg on highway. Toyota Prius runs 48 mpg in the city and 45 mpg on highway. The Honda Civic Hybrid runs 40 mpg in the city and 45 mpg on highway. When choosing what hybrid car to buy, take note of these differences.
Periodic engine shut off.
Idling consumes fuel too. So, most hybrid cars automatically turn off its combustion engine temporarily during stops. A hybrid car with this feature is most ideal if you drive in stop-and-go traffic most of the time.
Smaller and more efficient engine.
Logically, the car does not actually need a V6 or a V8 in order to run because most of the time, your car only requires 20 hp to move. The extra horsepower is only needed during acceleration. This is the reason why hybrid cars are so efficient. They use smaller engines.
Safety, Comfort, and Space.
These are 3 issues that are questionable to hybrid cars. In general, hybrid cars are as safe, as comfortable, and as spacious as their non-hybrid counterpart. But if you are more concerned about not getting these 3 in a hybrid car, you should not have a problem. There are several hybrid cars on the market today that focus on these 3 areas.
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Tuesday, March 30th, 2010
Rated to run from 20 mpg to 60 mpg, hybrid cars are designed for maximum fuel economy. But aside from its second source of power, what other factors can influence gas mileage? Here are those factors,
Size of the engine. It is quite ironic that the more powerful your engine is, the larger and heavier it becomes. So much of the additional power will be used just to carry the extra weight of the engine. Hybrid solves it by putting a small engine with an electric motor. Moreover, small engine has small cylinders that consume less fuel both at stop and while cruising. This makes hybrid cars more fuel efficient. Hybrid car engines are smaller and are significantly lighter, thus reducing the total weight of the car.
Driving condition (with respect to the hybrid car’s internal structure).
A hybrid car can either be parallel or series. With a parallel drive train, the car runs more fuel efficient on the highway. Series hybrids on the other hand work well in stop-and-go traffic.
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Car Design/Aerodynamics. When driving at high speeds, the car’s engine works more because it has to push the car through the air. This is called aerodynamic drag. And the faster the car is, the greater the aerodynamic drag it has to overcome. Hybrid cars work well both at slow and high speed because it’s design to cut through air that reduces the drag, thus increasing fuel economy. Low-rolling resistance tires, which are stiffer and inflated to higher pressure can further cut the drag and increase the fuel mileage of the car.
Vehicle Weight. When the car is heavy, the engine has to inject more fuel to the cylinder in order to push it forward. So in order to increase fuel economy, hybrid cars are made with lighter materials such as magnesium and aluminum or composite materials like carbon fiber.
Driving habits. Whether you are driving a hybrid or not, driving habits can definitely influence the gas mileage of your car. Hard braking and abrupt acceleration wastes a lot of energy. Even if your hybrid has the regenerative braking system, the maximum amount of energy cannot be recaptured back to your battery. Abrupt acceleration on the other hand requires more power from both the electric motor and the combustion engine which equates to more fuel consumption. To increase gas mileage, anticipate braking distance, step on the brake softly, and accelerate gently.
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Tuesday, March 30th, 2010
Hybrids are planning to use electric propulsion systems which prove to be very efficient and also environmentally friendly. There may be various approaches and methods in order to accomplish movement using electric power but the main idea is still the same. These systems are already working and will further help develop alternate fuel.
What is Electric Propulsion?
Electric propulsion is the acceleration of gases in order to produce propulsive thrust through electric and magnetic body forces, electric body forces or electric heating. The electric propulsion system is usually incorporated in rocket science wherein it manages energy enough to produce a powerful thrust. An electric propulsion system is an alternative to nuclear propulsion system. The total thrust is less powerful compared to a nuclear rocket but still enough to produce effects.
According to a number of studies, any engine used as a primary source of such powerful propulsion must produce exhaust velocities of around 10 to 20 km/s. There are also storable chemical systems used in rockets with an exhaust velocity of around 5 km/s but overall is less efficient.
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Propulsion systems that do not require energy through chemical reactions are still needed. There are electric propulsion thrusters able to produce exhaust velocities of around 10 to 20 km/s which increases payload and reduces propellant mass. The consequences however, are less powerful thrusters consuming larger quantities of power.
The 3 Categories of Electric Propulsion
Electro thermal propulsion is when the propellant is electrically heated then isentropically expanded through a C/D or convergent/divergent nozzle. The system works as electrical energy heats propellants that produce gases as a result. The gases are sent through the C/D nozzle creating thrust. Catalyzed hydrazine or another neutral gas is used in thrusters like arc jets and resistojets.
Arc jets can also be used to heat the propellants via an electrical arc discharge. The arc in the arc jet is a beam of electrons produced from the cathode tip then gathers at the anode. Since an arc jet has a cathode and an anode, a constrictor is also present which is a narrow pathway between the two charges.
Electrostatic thrusters are also called ion thrusters. These use an ionized propellant accelerated through electric fields applied directly like gridded ion thrusters and Hall thrusters. The technique of propulsion is also known as ion propulsion technique since ions are mainly used in the process. Electrostatic energy is used to produce propulsion.
The electrons from an atom are stripped off then converted to ions. The ions are accelerated by electrical forces to high temperature without needing thermal energy producing thrust. The atoms after losing electrons become positively charged.
Electromagnetic thrusters produce thrust using electric and magnetic forces that interact with charged plasmas like ions and electrons. An example of these is the magnetoplasmadynamic thruster or MPD. The system heats the propellant to a plasma state before being accelerated. A large current is passed by electromagnetic forces through gas in order to ionize the propellant. Plasma is the ionized propellant which is then accelerated by Lorentz force, an electromagnetic force producing thrust.
Effect on Fuel
Decoupling engine speed and power output from the propeller will provide the opportunity to improve propeller efficiency. Since electric forces and electromagnetic forces kick in for support, gasoline and diesel propulsion systems in vehicles will decrease the chances of wasting a huge part of power and energy.
The chances of engine overload are eliminated resulting to better fuel economy and better gas mileage. In addition, there is higher efficiency over longer distances and various speeds and loads.
A study conducted to check how much electric propulsion systems can help diesel and gasoline engines showed that at least 10% fuel savings is achieved by simply allowing the engine to move along with the load reducing inefficiencies due to low load with high speed. Larger propellers can also save as much as 7% of fuel compared to traditional models.
ith the total load split between multiple generators, as much as 20% of fuel can be saved plus another 13% by matching the power produced by the engine to the power required by the propeller. A variable-speed generator will help accomplish this. Overall, 30% to 50% can be saved compared to a very efficient diesel-electric or gasoline-electric system.
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