MODULE AND METHOD PERTAINING TO MODE CHOICE WHEN DETERMINING REFERENCE VALUES

摘要

Described is a method for determining a reference value for a vehicle. The method includes: performing a number of simulation cycles Sj each comprising simulation steps: making a first prediction of the vehicle's speed vpred—cc along the determined horizon with a conventional cruise control; comparing, in a first comparison, the predicted vehicle speed vpred—cc with vlim1 and vlim2, which define a motor torque used in a subsequent simulation cycle; making a second prediction of the speed when the engine torque is a value that depends on the result of said comparison in the latest preceding simulation cycle; comparing, in a second comparison, the predicted vehicle speed vpred—Tnew with vmin, and vmax1 which demarcate a range within which the speed is maintained; determining the reference value based on the second comparison and/or the second predicted speed in that simulation cycle Sj; and controlling the vehicle according to the reference value.

主权项

1. A module for determination of at least one reference value for a control system of a vehicle, the module comprising:
an input unit configured to receive at least one set speed vset for the vehicle; a mode choice unit configured to receive a choice from at least two selectable driving modes, each driving mode comprising a setting which influences the determination of the at least one reference value; a horizon unit configured to determine an itinerary by reference to map data and location data, the horizon made up of at least one route segment with at least one characteristic; a calculation unit configured to perform a number of simulation cycles sj, each simulation cycle comprising a number N of simulation steps conducted at a predetermined rate f, the simulation steps including:
making a first prediction of the speed vpred—cc of the vehicle along the horizon such that the set speed vset is taken as a reference speed vref, the first prediction made based on the characteristic of said route segment;comparing, as a first comparison, the first predicted vehicle speed vpred—cc with first lower and upper limit values vlim1 and vlim2 to define an engine torque T, the engine torque T used in an immediately following simulation cycle sj+1;making a second prediction of the speed vpred—Tnew of the vehicle along the horizon, the engine torque T being a value defined in said first comparison in an immediately preceding simulation cycle sj−1; andcomparing, as a second comparison, the second predicted vehicle speed vpred—Tnew with at least one of second lower and upper limit values vmin and vmax, wherein vmin, and vmax delineate a range within which the speed of the vehicle is maintained; anddetermining said at least one reference value along the horizon based on the chosen driving mode and on said second comparison and/or the second predicted vehicle speed vpred—Tnew in this simulation cycle sj, so that the at least one reference value is within the range bounded by the second lower and upper limit values vmin and vmax; and a providing unit configured to output to a control system of the vehicle said at least one reference value based on which the speed of the vehicle is then regulated.