Shuttle strategy for vehicles with electronically controlled transmissions and engines

Abstract

A vehicle is configured to perform shuttle-shifting and comprises an engine and a power shift transmission operably connected with the engine comprising forward and reverse mechanical gears, the power shift transmission having more forward mechanical gears than reverse mechanical gears. The vehicle comprises a processor operably connected to the power shift transmission and to the engine, and is configured to receive a command from a user to establish a relationship between a last forward gear used and a desired reverse performance. The processor is configured to determine a desired reverse ratio based upon the last forward gear used and the established relationship and to select a reverse mechanical gear having a reverse gear ratio which is the same or less than the desired reverse ratio. The processor is configured to control the power shift transmission to shift to the selected reverse mechanical gear and if the reverse gear ratio of the selected reverse mechanical gear is less than the desired reverse ratio, an RPM of the engine is controlled to compensate for a difference between the reverse gear ratio of the selected reverse mechanical gear and the desired reverse ratio.