COOLING SYSTEM FOR HYBRID ELECTRIC VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide a cooling system for hybrid electric vehicle capable of being simply constituted at a low cost by integrating an internal combustion engine to the cooling system of an electric motor. SOLUTION: An electric motor cooling water passage 180 branched and combined so as to be parallel to the downstream water passage 171 of a main radiator 130 is provided in an engine cooling water passage 180, and a sub- radiator 140 and the electric motor 120 are arranged in the passage 180 successively to the cooling water flowing direction. A flow regulating valve 210 for regulating the flow distribution of the cooling water passing through the downstream water passage 171 and the passage 180 and the electric pump 220 for circulating the cooling water to the engine cooling water passage 170 are provided in the branch part 171a of the downstream water passage 171, and the opening of the flow regulating valve 210 and the discharge flow rate from the electric pump 220 are controlled by a control means 230 according to the load state of an engine 110 and the electric motor 120.