Patent ID: 7195006

Claim:
A high-pressure loop exhaust gas recirculation (EGR) system for recirculating exhaust from an engine, the engine having an air intake line, a turbocharger, and a primary exhaust line, comprising: an EGR loop for carrying EGR gas, the loop branching from the primary exhaust line upstream the turbine of the turbocharger and entering the engine air intake line downstream the compressor of the turbocharger; a dual-leg segment of the EGR loop, a first leg having an EGR cooler and a second leg having an EGR heater; and a diverter valve at the input to the dual-leg segment, the diverter valve operable to control the amount of EGR flow through the first leg relative to the second leg; wherein, downstream the cooler and the heater, the first leg and the second leg are rejoined to a single flow in the EGR loop.