BOLT 4F3665 - Caterpillar

Introduction
The engine is designed for electronic control. The engine has an Electronic Control Module (ECM), a fuel injection pump and electronic unit injectors. All of these items are electronically controlled. There are also a number of engine sensors. The engine has an electronically controlled wastegate for the turbocharger. The ECM controls the engine operating parameters through the software within the ECM and the inputs from the various sensors. The software contains parameters that control the engine operation. The parameters include all of the operating maps and customer-selected parameters.
Illustration 1 g03461497
Typical example of the control system layout for the engine with a single turbocharger
(1) Air cleaner
(2) Air inlet temperature sensor
(3) Turbocharger outlet temperature sensor
(4) Exhaust gas cooler (NRS)
(5) Turbocharger
(6) NRS temperature sensor
(7) Exhaust gas valve for the NOx Reduction System (NRS)
(8) NRS inlet pressure sensor
(9) ATAAC outlet temperature sensor (optional)
(10) Exhaust gas valve (NRS)
(11) Air-to-air aftercooler
(12) Wastegate regulator
(13) NRS differential pressure sensor
(14) Engine
(15) Coolant temperature sensor
(16) Crankshaft speed/timing sensor
(17) Electronic unit injectors
(18) Return fuel cooler
(19) Camshaft speed/timing sensor
(20) Fuel injection pump and fuel temperature sensor
(21) Fuel pressure sensor
(22) Oil pressure sensor
(23) Atmospheric pressure sensor
(24) ECM
(25) Secondary fuel filter air purge restrictor
(26) Fuel transfer pump
(27) Primary fuel filter
(28) In-line fuel filter
(29) Boost pressure sensor
(30) Inlet manifold air temperature sensor
(31) Transfer pump inlet regulator
(32) Secondary fuel filter
(33) Fuel tank
Illustration 2 g03461498
Typical example of the control system layout for the engine with series turbochargers
(1) Air cleaner
(2) Air inlet temperature sensor
(3) Turbocharger outlet temperature sensor
(4) Low-pressure turbocharger
(5) Exhaust gas cooler (NRS)
(6) High-pressure turbocharger
(7) NRS temperature sensor
(8) Exhaust gas valve for the NOx Reduction System (NRS)
(9) NRS inlet pressure sensor
(10) ATAAC outlet temperature sensor (optional)
(11) Exhaust gas valve (NRS)
(12) Air-to-air aftercooler
(13) Wastegate regulator
(14) NRS differential pressure sensor
(15) Engine
(16) Coolant temperature sensor
(17) Crankshaft speed/timing sensor
(18) Electronic unit injectors
(19) Return fuel cooler
(20) Camshaft speed/timing sensor
(21) Fuel injection pump and fuel temperature sensor
(22) Fuel pressure sensor
(23) Oil pressure sensor
(24) Atmospheric pressure sensor
(25) ECM
(26) Secondary fuel filter air purge restrictor
(27) Fuel transfer pump
(28) Primary fuel filter
(29) In-line fuel filter
(30) Boost pressure sensor
(31) Inlet manifold air temperature sensor
(32) Transfer pump inlet regulator
(33) Secondary fuel filter
(34) Fuel tank
Illustration 3 g03461499
Block diagram for the aftertreatment system
(33) Diesel Exhaust Fluid (DEF) level sensor
(34) DEF temperature sensor
(35) Coolant diverter valve
(36) Main power relay Module (VLPM)
(37) Voltage Load Protection
(38) DEF header unit
(39) Line heater relay
(40) DEF tank
(41) Dosing Control Unit (DCU)
(42) Soot sensor and antennas
(43) Heated DEF line
(44) Heated DEF line
(45) Diesel Particulate Filter (DPF) inlet temperature sensor
(46) DPF outlet NOx sensor
(47) Exhaust Back Pressure Regulator (EBPR)
(48) Diesel Oxidation Catalyst (DOC)
(49) Diesel Particulate Filter (DPF)
(50) DEF filter
(51) Heated DEF line
(52) DEF injector
(53) DEF dosing pump
(54) Selective Catalytic Reduction (SCR) catalyst
(55) Ammonia Oxidizing (AMOX) catalyst
(56) SCR inlet temperature sensor
(57) SCR outlet NOx sensor
(58) Identification module The electronic control system has the following components:
ECM
Pressure sensors
Temperature sensors
Crankshaft speed/timing sensor
Camshaft speed/timing sensor
The suction control valve for the fuel injection pump
Wastegate regulator
Electronic unit injectors
Soot sensors
Valve for the NOx Reduction System (NRS)Sensor Locations for the Engine
The illustrations in this section show the typical locations of the sensors for the industrial engine. Specific engines