Auxiliary power unit for hybrid electric vehicle

An alternator/starter oil cooling system for a hybrid electric vehicle having an auxiliary power unit, comprising:

• an alternator/starter of the auxiliary power unit having a rotor and a stator, the rotor being mounted onto a drive shaft of the hybrid electric vehicle, the stator having a winding stack on a core of the stator;
• a housing containing the alternator/starter;
• means for conducting heat from inside the alternator/starter, the alternator/starter being cooled at an outside of the alternator/starter, the conducting heat means being disposed at an end of the winding stack of the stator;
• cooling means for cooling heat on the outside of the alternator/starter, the cooling means being disposed around the conducting heat means and the winding stack of the stator;
• first seal means, disposed between the housing and the alternator/starter, for sealing the cooling means to prevent a cooling material from leaking into the alternator/starter, cooling contaminations are eliminated inside the alternator/starter;
• second seal means, disposed around the cooling means, having a wall for sealing the cooling means to prevent the cooling material from leaking into the alternator/starter;
• cooling material inlet means, mounted on the housing, for allowing the cooling material to flow into the cooling means;
• cooling material collecting means, mounted to an end of the cooling means, for collecting the cooling material after passing through the cooling means;
• and
• cooling material outlet means, disposed at an end of the cooling material collecting means, for allowing the cooling material to flow out of the housing.

A thermal management system for a hybrid electric vehicle having an auxiliary power unit, comprising:

• alternator/starter cooling means for cooling an alternator/starter in the auxiliary power unit;
• engine lubricating/cooling means for cooling an engine in the auxiliary power unit;
• cooling material collecting means for collecting a cooling material after passing through the alternator/starter and the engine;
• means for scavenging the cooling material from the cooling material collecting means to a first heat exchanger so that the cooling material can be recycled for further cooling purposes;
• means for circulating the cooling material back to the alternator/starter and the engine;
• and
• a second heat exchanger being disposed on the circulating means between the first heat exchanger and an alternator/starter inlet.

An alternator/starter oil cooling system for a hybrid electric vehicle, comprising:

• an alternator/starter having a rotor and a stator, the stator having a winding stack on a core of the stator;
• a housing containing the alternator/starter;
• means for conducting heat from inside the alternator/starter, the conducting heat means being disposed at an end of the winding stack of the stator;
• cooling means for cooling heat from inside the alternator/starter, the cooling means having first and second cooling passageways, the first cooling passageway being disposed around the heat conducting means for directly cooling heat from inside of the alternator/starter, the second cooling passageway being disposed around the winding stack of the stator for cooling heat on the winding stack of the stator;
• cooling material inlet means, mounted on the housing and being in fluid communication with the first and second cooling passageways, for allowing a cooling material to flow into the cooling passageways;
• cooling material collecting means, mounted to an end of the cooling means, for collecting the cooling material after passing through the cooling means;
• and
• cooling material outlet means, disposed at an end of the cooling material collecting means, for allowing the cooling material to flow out of the housing.

A thermal management system for a hybrid electric vehicle having an auxiliary power unit, comprising:

• alternator/starter cooling means for cooling an alternator/starter in the auxiliary power unit;
• engine lubrication/cooling means for cooling an engine in the auxiliary power unit;
• cooling material collecting means for collecting a cooling material after passing through the alternator/starter and the engine;
• means for scavenging the cooling material from the cooling material collecting means to heat exchanger means which is connected to the scavenging means;
• and
• means for circulating the cooling material from the heat exchangermeans back to the alternator/starter and the engine.