Toyota RAV4>> Ignition system>> The general data



The ignition system is intended for ignition топливовоздушной to a mix in each cylinder at a given time. In petrol engines it is reached at the expense of an electric spark (the electric category), a spark plug created between electrodes.
Reliable work of ignition in all range of work of the engine is the essential factor for effective work catalytic neutralizer.
Ignition by a spark of a small cloud мелкодисперсной топливовоздушной is enough mix to start burning process.
The spark plug defines length of a spark which also depends on type and a design of system of ignition, and also from conditions at which there is an ignition.
For occurrence of a spark pressure between candle electrodes should increase sharply from zero to the pressure necessary for formation of an arch. After occurrence of the spark category pressure falls to level necessary for spark distribution, thus there is an ignition топливовоздушной mixes.
For energy reception искрообразования the coil of ignition working by a principle of the autotransformer and accumulating energy of ignition is used. At current giving energy of a current passes to a primary winding of the coil of ignition in energy of a magnetic field till the moment of a stopping delivery of a current. The magnetic field thus sharply decreases, directing in a secondary winding of the coil of ignition a power-current arriving on high-voltage wires on one spark plug.
Between the initial moment of ignition of a working mix and its full combustion passes approximately 2 мс. Therefore spark formation should occur earlier, than the piston will reach ВМТ that provides optimum combustion in all range of frequency of rotation of the engine. The ignition moment is defined depending on frequency of rotation of a cranked shaft, loading, design features of the engine, quality of fuel and working conditions in a present situation (start, idling, size of opening throttle заслонки, etc.).
The spark plug serves for transfer of the power-current developed in the coil of ignition, to electrodes in the combustion chamber where this current makes the spark category for ignition of a working mix.