HOSE AS 4752261 - Caterpillar

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(4) ARD body (6) ARD head (11) Line for the combustion air (12) Exhaust from turbocharger (13) ARD air valve controller (14) ARD combustion air valve (38) Exhaust air to DOC and DPF (39) Exhaust manifold (40) Turbocharger (41) Compressed air to aftercooler (42) Combustion air inlet pressure sensorExhaust AirExhaust air flows from the turbine housing to the ARD body. The exhaust air then flows through the Diesel Oxidation Catalyst (DOC) and the DPF. The exhaust air then exits through the muffler (if equipped).Combustion AirThe air used to supply the ARD head is taken from the turbocharger compressor outlet. The pressure of this air is measured at the inlet to the ARD combustion air valve by the combustion air inlet pressure sensor. The air is then metered by the ARD combustion air valve. The ARD combustion air valve contains a DC motor and analog position sensor. The ARD combustion air valve is commanded via the ARD air valve controller. The ARD air valve controller communicates via J1939 datalink with the engine ECM. The ARD air valve controller sends the air valve position signal to the engine ECM. The engine ecm then sends a desired valve position to the ARD air valve controller. The ARD air valve controller processes the desired valve position command into a % current command to the ARD combustion air valve. The ARD combustion air valve moves the desired amount and the new valve position is transmitted back to the ARD air valve controller.
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(13) ARD air valve controller (14) ARD combustion air valve (22) Electronic Control Module (ECM) (43) Desired position command through J1939 (44) Bi-directional current to control the ARD combustion air valve (45) Actual valve position data through J1939 (46) Valve position data through voltage signalOnce the air has been metered by the ARD combustion air valve, the air enters the ARD head. The ARD head contains a swirling plate that is designed to agitate the air that is being mixed with the fuel. This agitated air allows for a precise burn of the air/fuel mixture.Cooling System
Two lines circulate coolant in the ARD head. The coolant is used to extend the life of the O-ring for the ARD nozzle.Diesel Particulate Filter (DPF) System
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(47) DPF inlet and delta pressure sensors (48) DPF inlet temperature sensor (49) RF soot sensor antennas (50) RF soot sensor monitor (remote mounted)Note: The hardware for RF soot sensor monitor (50) may be present but is no longer operational.The DPF system contains two types of filter media. The first filter media that exhaust gas is exposed to is the Diesel Oxidation Catalyst (DOC). This filter is a flow through style filter. The DOC is contained in the inlet section of the DPF cannister. The DOC filter contains platinum and palladium. The minerals aid in oxidizing hydrocarbons, carbon monoxide, and soluble organic fractions as the exhaust gas flows through the filter. The inlet section of the DPF cannister also contains the following items a temperature sensor, an RF