Patent ID: 9702289
Date: 2017-07-11
CPC Classifications: F01K,F01N,F02G,Y02T

Claim:
1. A method of heating and cooling exhaust gas flowing through an exhaust gas circuit of an internal combustion engine, the method comprising: measuring an exhaust gas temperature; operating a waste heat recovery (WHR) system in a heating mode if the exhaust gas temperature is less than a predetermined temperature range, the heating mode comprising flowing a working fluid from a condenser/evaporator downstream to a turbine/compressor, through a heat exchanger, and then through an expansion valve to a switching valve; and operating the WHR system in a cooling mode to maintain the exhaust gas temperature within the predetermined operating range, the cooling mode comprising flowing the working fluid flows from the condenser/evaporator through the switching valve to a feed pump and then downstream to the heat exchanger.