DIESEL ENGINE INTAKE AIR PREHEATER FUEL CONTROL

摘要

DIESEL ENGINE INTAKE AIR PREHEATER FUEL CONTROL A metering and control system is described for supplying fuel to a burner nozzle of a burner assembly which preheats intake air in a diesel engine. Fuel for the control system is derived from the regulated pressure output of a fuel pump in the engine fuel supply system. The fuel metering and control system includes a series of parallel flow lines connected between the fuel pump and the burner nozzle. Each line has a metering orifice and check valve set to pass flow above a given pressure level. For intermediate rpm flow is through one line and at high rpm flow is through both. As a result, the fuel flow rate into the burner nozzle is directly proportional to engine rpm to provide a uniform nozzle preheat temperature over the full range of engine rpm. Suitable control inputs are provided to initiate or terminate flow to the burner in response to selected engine operating parameters. In addition, supplemental fuel flow may be provided during start up and/or cold operating conditions, again initiated or terminated by selected engine operating parameters.