SPARK IGNITION TYPE ENGINE WITH TURBOSUPERCHARGER

• Main Author: KOGA TATSUYA
• Format: Patent
• Language: English
• Published: 08.09.2014
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

PROBLEM TO BE SOLVED: To provide a spark ignition type engine with a turbosupercharger, achieving improved torque by avoiding abnormal combustion when the engine operates in a medium-speed range and in a high-load region.SOLUTION: A valve train 12 is constructed so as to set an opening/closing timing for each of an intake valve 9 and an exhaust valve 10. The valve train 12 sets a valve closing timing for the intake valve in such a manner that charging efficiency is a predetermined value or less when an engine body (an engine 1) operates in a medium-speed range and in a high-load region, sets opening/closing timings for the intake valve and the exhaust valve in such a manner that an overlap period is provided where a valve opening period for the intake valve and a valve opening period for the exhaust valve overlap each other, and sets a valve opening timing for the exhaust valve in such a manner that a timing for a trough in the pressure pulsation of exhaust gas coincides with the overlap period.