US 11,753,971 B2
Method for verifying CVVD location learning result and CVVD system thereof
Bon-Chang Koo, Seongnam-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA CORPORATION, Seoul (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA CORPORATION, Seoul (KR)
Filed on May 27, 2022, as Appl. No. 17/826,286.
Application 17/826,286 is a division of application No. 16/211,911, filed on Dec. 6, 2018, granted, now 11,391,188.
Claims priority of application No. 10-2018-0104795 (KR), filed on Sep. 3, 2018.
Prior Publication US 2022/0282646 A1, Sep. 8, 2022
Int. Cl. F01L 13/00 (2006.01); F02D 13/02 (2006.01); G06N 20/00 (2019.01)
CPC F01L 13/0015 (2013.01) [F02D 13/0207 (2013.01); F01L 2800/09 (2013.01); F01L 2800/12 (2013.01); G06N 20/00 (2019.01)] 3 Claims
OG exemplary drawing
 
1. A continuously variable valve duration (CVVD) system, comprising:
a controller configured to:
determine, by a data input unit of the controller, whether a learning value acquired in a short duration and a long duration of the CVVD system is required to be verified;
determine, by a CVVD learning map of the controller, whether the acquired learning value should be verified based on conditions of each of a CVVD system hardware abnormality, a learning value abnormality, and a motor voltage abnormality, wherein a learning value verification control is performed when all of the conditions are not satisfied; and
perform the learning value verification control by comparing a position of a stopper of a control shaft connected to a motor with a cam shaft rotation value, generated by a first protrusion or a second protrusion of a cam shaft during a rotation of the cam shaft, wherein the cam shaft rotation value is detected by an auxiliary cam sensor by detecting the rotation of the cam shaft by recognizing the first protrusion or the second protrusion of the cam shaft,
wherein the learning value verification control is divided into a long position verification control and a short position verification control, and wherein in the long position verification control a cam shaft rotation value detected by the auxiliary cam sensor is applied to a first threshold, and wherein in the short position verification control a second threshold is applied to the cam shaft rotation value detected by the auxiliary cam sensor;
a cam sensor provided at an end portion of the cam shaft;
an auxiliary cam sensor positioned at a middle portion of the cam shaft; and
a CVVD learning verification map configured to provide a signal indicating whether a hardware abnormality, a learning value abnormality, or a motor voltage abnormality is present in the CVVD system.