Patent ID: 8437930
Filing Date: 2013-05-07
Classification: F16H

Abstract:
1. A method for controlling a TCU (Transmission Control Unit) fail-safe using an electronic shift lever unit, comprising: a) carrying out communication between a TCU controlling a transmission and the electronic shift lever unit; b) verifying whether the TCU is in a first failure state or not according to the communication; c) driving a motor of a parking power machine in order to pull an override cable connected to a parking sprag locked in a parking gear of the transmission to unlock the parking sprag from the parking gear, when the electronic shift lever unit determines that the TCU is in the first failure state after the communication therebetween; d) verifying by using the electronic shift lever unit whether the TCU is in a second failure state, after the override cable is pulled; e) checking a speed of a vehicle by using the electronic shift lever unit connected to a vehicle speed supplier, when the TCU is verified to be in the second failure state; and f) informing a driver of a failure state of TCU by using the electronic shift lever unit, when the speed of the vehicle is over the predetermined speed.