公开(公告)号：US20190257424A1

公开(公告)日：2019-08-22

申请号：US16003177

申请日：2018-06-08

Applicant: HYUNDAI MOTOR COMPANY ,  KIA MOTORS CORPORATION

Inventor： Min Yong LEE

IPC: F16J9/14

Abstract: A piston ring for an engine includes a compression ring fitted into one of a plurality of ring grooves of a piston head, wherein the compression ring has a first section of which a cross-section has a quadrangular shape and a second section of which a cross-section has an internal bevel shape having a bevel surface on a top corner of an inner peripheral surface, the first section and the second section alternately arranged along a circumferential direction of the piston ring.

公开(公告)号：US20210079819A1

公开(公告)日：2021-03-18

申请号：US16993579

申请日：2020-08-14

Applicant: HYUNDAI MOTOR COMPANY ,  KIA MOTORS CORPORATION

Inventor： Min Yong LEE ,  Seong Sik KIM ,  Jun Sik PARK ,  Hyun Kyu LIM

IPC: F01M1/16 ,  F01M1/02 ,  F01M1/20

Abstract: A method of controlling an oil pump of a vehicle includes: acquiring, by a controller, information on an engine operating state or a driving condition detected by a driving information detection part; determining, by the controller, whether a predetermined condition of an alternate mode is satisfied on the basis of the acquired information on the engine operating state or the driving condition; and, when the condition of the alternate mode is satisfied, sequentially performing, by the controller, a high-pressure operation control that controls an operation of an oil pump system so as to an oil pressure of an engine to converge on a predetermined target high-pressure value and a low-pressure operation control that controls the oil pressure of the engine to converge on a predetermined target low-pressure value.