| 摘要 |
The laser ignition system comprises a light guide 22 leading to an i.c. engine combustion chamber to introduce a pulse of laser light into the combustion chamber to ignite the charge. Additionally, less powerful pulses of laser light are introduced into the combustion chamber to be reflected from the piston 12 back to a sensor 30 to permit the position and/or the velocity of the piston crown to be determined. Both top dead centre (TDC) and bottom dead centre (TDC) piston positions may be determined. The additional pulses may be transmitted by the same light guide 22, the returning pulses being reflected by a beam splitter 28 to a sensor 30. Alternatively, a second light guide may be provided leading directly to the sensor 30 avoiding the need for a beam splitter; both light guides may be attached to a common connector to fit in place of the conventional spark plug. The data relating to piston speed and position may be used to sense detonation, misfire and burn rate.
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