Method and module for controlling a vehicle's speed

摘要

A method for controlling a vehicle's speed by adopting a desired speed vset for the vehicle; determining a horizon for the intended itinerary made up of route segments, effecting the following during each of a number of simulation cycles (s) each comprising a number N of simulation steps conducted at a predetermined frequency f: first predicting the vehicle's speed vpred—cc along the horizon with conventional cruise control when vset is presented as reference speed, comparing the predicted vehicle speed vpred—cc in a range vmin to vmax, making a second prediction of the vehicle's speed vpred—Tnew along the horizon based on the vehicle's engine torque T; determining a reference value for how the vehicle's speed is to be influenced on the basis of at least one of the comparisons and the predicted vehicle speed vpred—Tnew; controlling the vehicle by the reference value. A module for the foregoing controls a vehicle's speed.

主权项

1. A method for controlling a vehicle's speed which comprises:
receiving a desired speed vset for the vehicle; determining by means of map data and location data a horizon for the intended itinerary which is made up of route segments with at least one characteristic for each segment; effecting the following during each of a number of simulation cycles (s) each simulation cycle comprising a number N of simulation steps conducted at a predetermined frequency f: in a first prediction, calculating a first predicted vehicle speed vpred—cc along the horizon with conventional cruise control using vset as reference speed, and based on the characteristics of a segment; comparing the first predicted vehicle speed vpred—cc with a minimum speed value vmin and a maximum speed value vmax, which demarcate an intended range for the vehicle's speed; in a second prediction, calculating a second predicted vehicle speed vpred—Tnew along the horizon using a torque value T when first predicted vehicle speed vpred—cc is higher than the maximum speed vmax or less than the minimum speed value vmin, the torque value T being selected based on the comparison resulting from comparing in a latest preceding simulation cycle (s−1); determining at least one reference value which indicates how the vehicle's speed is to be influenced based on at least one of the comparison in simulation cycle (s) and the predicted vehicle speed vpred—Tnew; and sending to a control system in the vehicle the at least one reference value based on which the vehicle is thereupon regulated.