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POWER SYSTEM Engine Engine Types Fuel Supply Exhaust System Cooling and Heating System DRIVETRAIN Transmission Front- and Rear-Wheel Drive Suspension System Wheels and Tires Steering Brakes ELECTRICAL SYSTEM Ignition System SAFETY FEATURES CARS HISTORY Automobiles Through the Years Internal-Combustion Engine Early Electric Cars AUTOMOBILES IN THE 20TH CENTURY

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TRUCK:

TRUCKS LIGHT TRUCKS MEDIUM TRUCKS HEAVY TRUCKS TRAILERS TRUCKING OPERATIONS AND REGULATIONS HISTORY
PUBLIC TRANSPORTATION:

TYPES OF PUBLIC TRANSPORTATION Buses Paratransit Streetcars Light-Rail Transit Heavy-Rail Transit Commuter Rail Transit Automated Guided Transit Ferries DEVELOPMENT OF PUBLIC TRANSPORTATION IN THE UNITED STATES HISTORY
AUTOMOBILE INDUSTRY:

ECONOMIC IMPORTANCE Domestic Impact Foreign Trade HOW CARS ARE BUILT Research, Design, and Development Manufacturing and Assembly Sales and Service Customer Feedback HISTORY OF THE AUTOMOBILE INDUSTRY Early Automobile Concepts Henry Ford and Mass Production Other Automakers The Great Depression of the 1930s Labor Unions and Strikes Wartime Production Postwar Production Automobile Safety Foreign Imports and the Energy Crisis The 1980s and 1990s FUTURE AUTOMOBILE INDUSTRY TRENDS Computerization Alternative Fuel Research Materials and Safety
ROAD:

TYPES OF ROADS Highways Urban Streets Rural Roads ROADWAY ENGINEERING Roadbed Base Course Wearing Course Bituminous Pavement Concrete Pavement ROAD PLANNING AND ADMINISTRATION HISTORY OF ROAD CONSTRUCTION

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Ignition System Automobile


Ignition System Automobile - Cars Ignition System  The ignition system delivers voltage to ignite the fuel in the automotive vehicle. When the ignition switch is turned on, low-voltage electric current flows from the battery to the coil, which converts the current to high-voltage. The current then flows to the distributor, which delivers it to each of the spark plugs. The spark plugs send an igniting spark to the fuel/air mixture in the combustion chambers.

 The ignition system supplies high-voltage current to spark plugs to ignite fuel vapor in the cylinders. There are many variations, but all gasoline-engine ignition systems draw electric current from the battery, significantly increase the currentís voltage, then deliver it to spark plugs that project into the combustion chambers. An electric arc between two electrodes at the bottom of the spark plug ignites the fuel vapor.

 In older vehicles, a distributor, which is an electrical switching device, routes high-voltage current to the spark plugs. The distributorís housing contains a switch called the breaker points. A rotating shaft in the distributor causes the switch to open and close, interrupting the supply of low-voltage current to a transformer called a coil. The coil uses electromagnetic induction (see Electricity: Electromagnetism) to convert interruptions of the 12-volt current into surges of 20,000 volts or more. This high-voltage current passes back to the distributor, which mechanically routes it through wires to spark plugs, producing a spark that ignites the gas vapor in the cylinders. A condenser absorbs excess current and protects the breaker points from damage by the high-voltage surge. The distributor and other devices control the timing of the spark-plug discharges.

 In modern ignition systems, the distributor, coil, points, and condenser have been replaced by solid-state electronics controlled by a computer. A computer controls the ignition system and adjusts it to provide maximum efficiency in a variety of driving conditions.

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