Controller for hybrid vehicle drive system

A controller mounted on a hybrid vehicle having a plurality of heat generating components including an engine, each of said plurality of heat generating components including a cooling conduit through which a fluid flows to cool the respective components, the cooling conduits of said plurality of heat generating components being selectively interconnected, said controller comprising:

• first decision means for deciding whether said engine is in a warmed-up condition;
• second decision means for deciding whether components whose rejected heat is to be utilized are in a warmed-up condition, said components whose rejected heat is to be utilized including at least one of said plurality of heat generating components to be mounted on the hybrid vehicle except said engine;
• and
• control means for allowing the fluid to flow between the cooling conduit of said engine and the cooling conduit of the component whose rejected heat is to be utilized when said first decision means determines that said engine is not in a warmed-up condition and said second decision means determines that the component whose rejected heat is to be utilized is in a warmed-up condition.