Patent ID: 9052012
Filing Date: 2015-06-09
Classification: F16H,Y10T

Abstract:
1. A shift-by-wire system for controlling a transmission of a vehicle, the shift-by-wire system comprising: a shift lever movable between a plurality of transmission range positions and a null position, each of the plurality of transmission range positions corresponding to a transmission range, the shift lever having at least one shift lever position sensor configured to sense a position of the shift lever and to generate a shift lever position signal communicating the position of the shift lever; a park button switchable between a pressed position and a released position, the pressed position corresponding to a Park transmission range, the park button having at least one park button position sensor configured to sense the position of the park button and to generate a park button position signal communicating the position of the park button; and a controller configured to receive the shift lever position signal and the park button position signal, and to determine a transmission range selection in which to place the transmission based on whether at least one predetermined condition exists; wherein the transmission range selection is the Park transmission range when the at least one predetermined condition exists, and is the transmission range corresponding to the transmission range position in which the shift lever is positioned when the at least one predetermined condition does not exist; wherein the at least one predetermined condition is that: wherein the park button is in the unknown position when there is a fault with at least one of the park button, the at least one park button position sensor, and the park button position signal; and wherein the shift lever is in the unknown position when there is a fault with at least one of the shift lever, the at least one shift lever position sensor, and the shift lever position signal.