Engine intake temperature control system

Claim 1

Combustion air induction system for an internal combustion engine cooled by a liquid engine coolant and having an induction manifold and a turbocharger for compressing ambient air to provide charge air to said induction manifold, comprising conduit means communicating charge air to said induction manifold, a coolant to charge air heat exchanger in said conduit means for transferring heat from said coolant to said charge air and from said charge air to said coolant depending upon the relative temperatures of said coolant and said charge air, and a charge air to ambient air heat exchanger in said conduit means adapted to transfer heat from said charge air to ambient air, said system including a bypass passage for bypassing charge air around said charge air to ambient air heat exchanger, valve means for opening and closing said bypass passage, measuring means for measuring one or more predetermined system parameters, and operating means responsive to said measuring means for operating said valve means to thereby control the temperature of the charge air communicated to the induction manifold in accordance with said parameters, said turbocharger being connected into an engine exhaust discharge system for supplying exhaust gas to said turbocharger for driving the latter, a particulate trap in said exhaust discharge system for trapping particulate matter entrained in said exhaust, and means for regenerating said particulate trap, said operating means being responsive to regeneration of said particulate trap to open said valve means to permit charge air to bypass said charge air to ambient air heat exchanger during regeneration of said particulate trap.