The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 2024
Filed:
Aug. 04, 2023
Hyundai Motor Company, Seoul, KR;
Kia Corporation, Seoul, KR;
Shengrong Zhu, Ann Arbor, MI (US);
Kyoung Pyo Ha, Gyeonggi-do, KR;
Mark Shirley, Albion, MI (US);
Ankith Ullal, Superior Township, MI (US);
Nam Kyun Kang, Superior Township, MI (US);
Jeffrey Hollowell, Commerce, MI (US);
Nicholas Fantin, Ann Arbor, MI (US);
Vincent Costanzo, Superior Township, MI (US);
Hyundai Motor Company, Seoul, KR;
Kia Corporation, Seoul, KR;
Abstract
Systems and methods for improving engine low load performance are provided. The method may comprise performing a negative valve overlap (NVO) mode of operation, using an early exhaust valve closing (EVC) timing that is earlier than the intake valve opening timing and creates an NVO during a gas exchange top dead center, to compress in-cylinder gas and increase overall gas temperature for improved fuel vaporization, mixing, and reforming before the fuel-air mixture is burnt. With NVO operation, a low temperature combustion (LTC) mode may be used to improve engine combustion efficiency and reduce emissions. With the NVO operation at low loads, the engine intake may be wide open or less throttled, reducing pumping loss. A method based on a rate of change in the engine speed and load for the combustion mode transition between spark ignition (SI) and LTC modes is provided.