Patent ID: 7942131
Filing Date: 2011-05-17
Classification: F01N,F02M

Abstract:
1. A fuel injection system including an arrangement ( 2 ) for metering fuel into an exhaust system of a diesel internal combustion engine, including a low pressure pump ( 9 ) and a high-pressure pump ( 16 ) which feeds fuel into an accumulator where said fuel is stored under high pressure, injectors which are connected to the accumulator for injecting fuel from the accumulator in each case into one combustion chamber of the internal combustion engine, a spray nozzle ( 36 ) mounted to the exhaust system and connected via an inflow line ( 34 ) with a pressurized fuel line of the fuel injection system, the arrangement for metering fuel to the exhaust system comprising a fuel control valve ( 39 ) for controlling the supply of fuel, a metering valve ( 40 ) for controlling the flow volume to the spray nozzle ( 36 ) and a pressure regulating valve ( 41 ) connected between the control valve ( 39 ) and the metering valve ( 40 ), the pressure regulating valve ( 41 ) having an outflow line ( 37 ) for returning excess fuel to the injection system ( 1 ).