Transmission control system

摘要

A method and a system for choosing a transmission mode in a vehicle over the course of a road section, in which a simulation of at least one future speed profile vsim for the road section ahead of the vehicle is conducted on the basis of a road slope for the road section. A time period Tappl is determined on the basis of the at least one simulated future speed profile vsim, which ensures that a lower transmission mode is chosen before a lowest permitted speed vmin defined for the road section and/or a set speed vset for a speed control is reached. During the determined time period Tappl, the transmission mode which is utilized when the simulation is made is applicable for the vehicle. After this, it is evaluated whether a lower transmission mode than the currently used transmission mode shall be chosen. A lower transmission mode shall be chosen if the time period Tappl for which the current transmission mode is applicable is shorter than a first threshold period Tlim.

主权项

1. A method for choosing a transmission mode in a vehicle over the course of a road section, the method comprising the steps of:
simulating, by a speed profile simulation unit of an automated controller comprising a computing unit processor, at least one future speed profile vsim for an actual speed for said vehicle over the course of said road section, wherein said simulating is conducted when said road section lies ahead of said vehicle and wherein said simulating is based at least on a road slope; and determining, by a current transmission mode time determining unit of the automated controller, a time period Tappl ahead of said vehicle for which a current transmission mode is deemed to be applicable, wherein said determining is based on said at least one future speed profile vsim and that a lower transmission mode is chosen before a lowest permitted speed yawl defined for said road section and/or a set speed vset for a speed control is reached; evaluating, by a lower transmission mode choosing unit of the automated controller, whether a lower transmission mode shall be chosen, and choosing said lower transmission mod; when said applicable time period Tappl is shorter than a first threshold period Tlim, wherein Tappl