COMBUSTION STATE DETECTION DEVICE OF INTERNAL COMBUSTION ENGINE

• Main Authors: OKAMURA KOICHI, UCHIDA TOSHIO, TAKAHASHI YASUHIRO, KOIWA MITSURU
• Format: Patent
• Language: English
• Published: 06.11.2003
• Edition: 7
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; LIGHTING; MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; MECHANICAL ENGINEERING; PHYSICS; TESTING; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; WEAPONS

PROBLEM TO BE SOLVED: To solve such a problem with a conventional combustion state detection device that a misfire cannot be detected by an ion current generated successively to an exhaust stroke. SOLUTION: This combustion state detection device of an internal combustion engine comprises an ECU performing a fuel injection and an ignition control based on the information on the rotation of an angle sensor, an ignition coil generating a high-voltage for ignition based on drive signals from the ECU, a bias means for applying a bias voltage for ion current detection to an ignition plug, a misfire detection (or knock detection) means for detecting the misfire (or detecting knocking) based on the ion current detected by the ion current detection means, a misfire determination means for determining the misfire based on output signals from the misfire detection means, and a detection period limiting means for limiting the detection period of the ion current treated by the misfire detection means or the knock detection means. COPYRIGHT: (C)2004,JPO