Exhaust gas heat recovery system

A powertrain comprising:

• an engine;
• an exhaust system including an exhaust passageway in fluid communication with the engine;
• an exhaust gas heat exchanger;
• a transmission having a transmission cooling system;
• a transmission heat exchanger;
• a heater core configured to transfer heat to a passenger compartment;
• a pump;
• an engine coolant circuit providing fluid communication between the engine, the exhaust gas heat exchanger, the transmission heat exchanger, the heater core, and the pump;
• wherein the exhaust gas heat exchanger is operatively connected to the exhaust system and configured to transfer heat between the engine coolant circuit and the exhaust system;
• wherein the transmission heat exchanger is operatively connected to the transmission cooling system and configured to transfer heat between the engine coolant circuit and the transmission cooling system;
• a plurality of variable restriction orifices configured to control fluid flow through respective portions of the engine coolant circuit;
• and
• wherein the plurality of variable restriction orifices includes a first variable restriction orifice that is configured to control fluid flow through the transmission heat exchanger and a second variable restriction orifice that is configured to control fluid flow through the heater core, wherein the transmission heat exchanger and the heater core are arranged in parallel fluid communication.