Engine thermal management system and method

The invention provides an engine thermal management system and method.The system comprises a thermal management valve and an electric control bypass valve, the thermal management valve is connected with a first exhaust manifold of an engine, and the electric control bypass valve is connected with a second exhaust manifold of the engine; the thermal management system further comprises an exhaust back pressure valve, and the exhaust back pressure valve is connected with the vortex end. Combustion waste gas of the engine is used for providing energy for the gas compressor through acting of a turbine of the turbocharger; and in combination with a fed-back turbine front pressure signal, closed-loop regulation of turbine efficiency is realized through combined regulation and control of a designed thermal management valve, an electric control bypass valve and an exhaust back pressure valve. Control and closed-loop adjustment of the efficiency of the turbocharger of the engine have great effects on improvement of the