METHOD AND APPARATUS TO CONTROL THE BRAKING OF A HYDRAULIC AUXILIARY BRAKE IN A VEHICLE

摘要

The present invention relates to a method and an arrangement for controlling the brraking of a hydrodynamic auxiliary brake (4) in a vehicle. The vehicle incorporates an ordinary brake and at least one auxiliary brake in the form of y hydrodynamic brake (4) which contains a circulating medium which is heated up by the heat generated by braking of the vehicle, a cooling system which contains a coolant designed to cool the circulating medium, and at least one brake control (9, 10) which is settable so that a braking effect called for is initiated by the hydrodynamic brake (4). The arrangement incorporates a control unit (12) designed to use information about the coolant's temperature (tc) and its rate of increase (tc') as a basis for allowing a limitation of the braking effect called for from the hydrodynamic brake (4), in order to prevent the coolant exceeding a maximum coolant temperature.