公开(公告)号：US20180328481A1

公开(公告)日：2018-11-15

申请号：US15594164

申请日：2017-05-12

Applicant: GM Global Technology Operations LLC

Inventor： Christopher J. Weingartz ,  Mohamed O. Egal ,  Mark S. Reinhart ,  Fie An ,  Xuefeng T. Tao

IPC: F16H61/12 ,  F16H61/662

CPC classification number: F16H61/12 ,  F16H61/662 ,  F16H2061/1212 ,  F16H2061/1272

Abstract: A variator control diagnostic system for an automobile vehicle includes a ratio error calculated by subtracting a transmission actual ratio from a commanded ratio. A first lookup table includes: an adjusted ratio error defined by adjusting the ratio error using a transmission fluid temperature value; and a rate curve compared against the adjusted ratio error to identify a lookup table output. A second lookup table provides a gross slip multiplier value based on a ratio bin torque offset value for a transmission ratio range. An adjusted error count is created by multiplying the gross slip multiplier value by the lookup table output.