Ignition System In the engine cylinder, the spark plug (ignition plug) generates sparks and ignites the air-fuel mixture. The engine ECU controls ignition timing based on engine conditions including revolution so that the pressure generated by the combustion effectively pushes down the piston. The crank position and cam position sensors detect the engine revolution.

DENSO Technology – Leading the World

• In 1996, DENSO introduced the world’s first stick coil with a cylindrical ignition coil to be stored in the engine plug hole. This stick coil now is almost a de facto standard. DENSO’s stick coil is compact and light, and has a smooth appearance on the top of the engine head cover.
• In 1997, DENSO was the first in the world to supply the Iridium spark plug to car manufacturers. In 1998, DENSO introduced the Iridium spark plug with the world’s thinnest diameter electrode – 0.4 mm –, achieving superb ignition performance.

Knock Control

Recently, the engine compression ratio has been increased to improve fuel economy. The increased compression ratio, however, easily causes spontaneous ignition, resulting in abnormal combustion (knocking). To prevent this, the knock sensor detects the knocking and delays the ignition timing to prevent the knocking from happening again.

DENSO’s vibration-type knock sensor accurately detects knocking in every cylinder.

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