ENGINE 3 Inputs to ECU Engine speed- crank signal Cam signal Pedal position Rail pressure signal Boost pressure signal Boost temperature signal Engine coolant temperature Knock sensor signal Fuel temperature signal Air mass flow Vehicle speed signal EGR valve Cooling fans control Air conditioning control Injector actuation – Delivery, injection timing DCM 3.1 ECU Outputs to ECU Data line 32bit Black Clock 40 Flash 448 RAM 26 EEPROM 2 SOP 2002 ELECTRONIC CONTROL UNIT & SENSORS ELECTRONIC CONTROL UNIT (ECU) Software Strategies ● Fuelling control including Idle ● Timing control ● Max speed control and flyup ● Driveability ● Fault detection ● AC control ● Engine cooling fans control ● Corrections for different environmental conditions- hot climate, cold climate, altitude ECU: The Electronic control Unit is a 32 bit microprocessor which controls the injection parameters as well as some of the vehicle related outputs. The ECU receives input from various sensors located on the engine and the vehicle to decide the injected quantity and injection timing best suited for the engine to work with maximum efficiency and safety. Input to the ECU is received from Crank sensor, Cam sensor, Vehicle speed sensor, Pedal sensor, Rail Pressure Sensor, Fuel Temperature sensor, Coolant temperature senor, Air mass flow sensor, Boost Pressure and Temperature sensor, atmospheric pressure sensor, Knock sensor and water-in-fuel sensor. Based on all these inputs, the ECU controls the injectors directly for the required injection quantity and injection timing. It
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