Patent ID: 8478498
Filing Date: 2013-07-02
Classification: B60W,F16H,Y10T

Abstract:
1. Method for controlling a powertrain in a vehicle comprising an electro-mechanical transmission including a frictionless engagement selectable one-way clutch mechanically-operatively coupled to an internal combustion engine adapted to selectively transmit mechanical power between an output member and a torque converter, said method comprising: monitoring engagement status of said selectable one-way clutch; monitoring an upshift command; monitoring a speed of an engine to torque converter shaft; monitoring a speed of a torque converter to transmission shaft; when said monitoring detects engagement of said selectable one-way clutch and said upshift command, determining a relative rotational speed of said torque converter based upon said speed of said engine to torque converter shaft and said speed of said torque converter to transmission shaft; diagnosing if a locked selectable one-way clutch condition is present based upon said relative rotational speed; commanding a torque increase from said engine based upon said locked selectable one-way clutch condition; and commanding disengagement of said selectable one-way clutch.