Internal combustion engine camshaft scheduling strategy for maximum pumping loss reduction

• Main Authors: KWIATKOWSKI ADAM S, NANUA PRABJOT
• Format: Patent
• Language: Chinese; English
• Published: 10.02.2010
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES; ENGINE PLANTS IN GENERAL; 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; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

A method of camshaft scheduling is disclosed which includes measuring a driver input; calculating a driver requested torque based on a measured driver input; and scheduling the camshaft based upon thedriver requested torque. In one example, the driver input is an accelerator pedal position, which is related to a percentage of driver torque requested. The cam position is selected based on the driver requested torque and the cam position is adjusted to provide one of a best fuel economy cam position and a best torque output cam position based upon the percentage of driver torque requested.