Systems and methods for decreasing torque fluctuations during cylinder deactivation and reactivation

• Main Authors: SLADE SEAN, BAUR ANDREW W
• Format: Patent
• Language: English
• Published: 18.11.2014
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; 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; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

A control system for an engine includes a first spark control module and a second spark control module. The first spark control module retards spark timing for M of N cylinders of the engine to a first spark timing during a period before deactivating or after reactivating the M cylinders, wherein M is an integer greater than or equal to one, and wherein N is an integer greater than M. The second spark control module advances spark timing for (N−M) active cylinders of the engine to a second desired spark timing during the period before deactivating or after reactivating the M cylinders, wherein the second spark timing is greater than the first spark timing.