Abstract: The invention relates to a method, system, and computer program product for controlling a waste heat recovery system associated with a vehicle powertrain, the powertrain comprising a combustion engine and a gearbox connected to the combustion engine, the waste heat recovery system comprising a working fluid circuit; an evaporator; an expander; a condenser; a reservoir for a working fluid and a pump arranged to pump the working fluid through the circuit, wherein the evaporator is arranged for heat exchange between the working fluid and at least one heat source, wherein the waste heat recovery system further comprises a cooling circuit arranged in connection to the condenser, and wherein the expander is mechanically coupled to the powertrain. The method comprises the steps of determining the pressure and temperature of the working fluid upstream of the expander; and controlling the rotational speed of the expander based on the determined pressure and temperature.

Abstract: Provided is a method for controlling a waste heat recovery system associated with a powertrain of a vehicle, the powertrain comprising a combustion engine and a gearbox connected to the combustion engine, the waste heat recovery system comprising a working fluid circuit; an evaporator; an expander; a condenser; a reservoir for a working fluid and a pump arranged to pump the working fluid through the circuit, wherein the evaporator is arranged for heat exchange between the working fluid and at least one heat source, wherein the waste heat recovery system further comprises a cooling circuit arranged in connection to the condenser, and wherein the expander is mechanically connected to the powertrain. The method comprises the steps of: predicting a downhill slope which will require braking of the vehicle; reducing the temperature of the evaporator to a predetermined temperature; and turning off the pump and thus the waste heat recovery system.

Abstract: The present invention relates a control system and a method for controlling exhaust flow in an exhaust line of a combustion engine comprising at least one exhaust treatment component and an evaporator of a waste heat recovery system. The control system comprises a valve arrangement in the exhaust line control unit, a temperature sensor to sense a temperature of the exhaust treatment component and a control unit configured to position the valve arrangement in a first position, when the exhaust treatment component has a lower temperature than a specific temperature of exhaust gases directed flow through to the exhaust treatment component before being directed to flow through the evaporator, and in a second position, when the exhaust treatment component has a higher temperature than said specific temperature of exhaust gases that are directed to flow through the evaporator before being directed to flow through the exhaust treatment component.