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1. (WO2017036492) A METHOD AND A SYSTEM FOR CONTROLLING VEHICLE SPEED

Pub. No.:    WO/2017/036492    International Application No.:    PCT/EP2015/069728
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Aug 29 01:59:59 CEST 2015
IPC: B60W 30/14
Applicants: VOLVO TRUCK CORPORATION
Inventors: CARLSSON, Tobias
ERIKSSON, Anders
KARLSSON, Lars
ANDERSSON, Henrik
Title: A METHOD AND A SYSTEM FOR CONTROLLING VEHICLE SPEED
Abstract:
The invention relates to a device and a method for controlling vehicle speed in a vehicle (100) equipped with brake cruise control when the vehicle is travelling downhill. The method involves driving a vehicle downhill with the brake set speed set to a first brake set speed (vB1); detecting a current vehicle speed; automatically applying a brake torque using at least an auxiliary brake (111) to maintain the first brake set speed (vB1); and detecting a manual application of a vehicle service brake, in order to decrease vehicle speed. If a control unit detects that the driver is applying the service brake (131, 132, 133), then the control unit is automatically arranged to set the brake set speed to a second brake set speed (vB2) that is lower than the first brake set speed (vB1); and to apply a brake torque using at least the auxiliary brake if a detected current vehicle speed exceeds the second brake set speed.