Cooling arrangement for cooling of an electric machine and at least one further component of an electric power unit and a vehicle comprising such a cooling arrangement

A vehicle comprising a cooling arrangement for an electric machine and at least one further component of an electric power unit, wherein the cooling arrangement comprises an oil circuit, an oil pump circulating oil from the oil circuit to the electric machine;

• a first coolant circuit configured to cool the further component of the electric power unit with a coolant by directing the coolant to the further component of the electric power unit, the further component including power electronics for controlling the flow of electric energy between the electric machine and an electric energy storage:
• a second coolant circuit configured to cool an electric energy storage of the electric power unit;
• a coolant radiator arrangement in which the coolant in the first coolant circuit and the coolant in the second coolant circuit are cooled by air, the coolant radiator arrangement providing coolant to the first coolant circuit via a first coolant outlet line and providing coolant to the second coolant circuit via a second coolant outlet line,
• the oil circuit comprises an oil radiator, an oil radiator fan located and configured to provide an adjustable air flow through the oil radiator;
• and
• a heat exchanger in which heat is transferred between the coolant in the first coolant circuit and the oil in the oil circuit;
• wherein the cooling arrangement further comprises a control unit configured to control speeds of a coolant radiator fan and the oil radiator fan such that the electric machine provides a required cooling with a minimum energy consumption of the fans;
• and
• wherein the control unit is further configured to control operation of the cooling arrangement based on information from a first temperature sensor measuring ambient temperature, a second temperature sensor measuring temperature of the coolant leaving the electric energy storage, a third temperature sensor measuring temperature of the coolant leaving the power electronics, and a fourth temperature sensor measuring temperature of the oil leaving the electric machine.

A cooling arrangement for an electric machine and at least one further component of an electric power unit, wherein the cooling arrangement comprises an oil circuit, an oil pump circulating oil from the oil circuit to the electric machine;

• a first coolant circuit configured to cool the further component of the electric power unit with a coolant by directing the coolant to the further component of the electric power unit, the further component including power electronics for controlling the flow of electric energy between the electric machine and an electric energy storage:
• a second coolant circuit configured to cool an electric energy storage of the electric power unit;
• a coolant radiator arrangement in which the coolant in the first coolant circuit and the coolant in the second coolant circuit are cooled by air, the coolant radiator arrangement providing coolant to the first coolant circuit via a first coolant outlet line and providing coolant to the second coolant circuit via a second coolant outlet line,
• the oil circuit comprises an oil radiator, an oil radiator fan located and configured to provide an adjustable air flow through the oil radiator;
• and
• a heat exchanger in which heat is transferred between the coolant in the first coolant circuit and the oil in the oil circuit;
• wherein the cooling arrangement further comprises a control unit configured to control cooling of the oil in the oil radiator;
• wherein the cooling arrangement comprises a coolant radiator fan configured to provide an air flow through the coolant radiator arrangement;
• wherein the control unit is further configured to control speeds of the coolant radiator fan and the oil radiator fan such that the electric machine provides a required cooling with a minimum energy consumption of the fans;
• and
• wherein the control unit is further configured to control operation of the cooling arrangement based on information from a first temperature sensor measuring ambient temperature, a second temperature sensor measuring temperature of the coolant leaving the electric energy storage, a third temperature sensor measuring temperature of the coolant leaving the power electronics, and a fourth temperature sensor measuring temperature of the oil leaving the electric machine.