tailieunhanh - The Motor Vehicle 2010 Part 4

Tham khảo tài liệu 'the motor vehicle 2010 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 234 The Motor Vehicle Inputs Outputs Timing _x_. _ reference Synch reference Throttle position J PROM Command pulse Injectors Turbo-boost pressure Feedback EDU Electronic control module z Oil temperature Diagnostic data link DDL Oil pressure Coolant level Battery Q Stop engine light Check engine light Fig. This is the first generation DDEC electronic control system for the GM unit injectors. It differs from the second generation system in that the command pulse and feedback are directed to and from the injectors through an EDU instead of directly. The EDU electronic distributor unit functions as a high current switching unit for energising the solenoids remains open. The layout of the system is illustrated diagrammatically in Figs and . Fuel is drawn from the tank through a filter to a gear type pump and thence into the governor whence it passes through a throttle valve and a shut-down valve to the pipeline that delivers it to the injectors. Of these components all between the pipelines from the tank and to the injectors are actually grouped in a single unit Fig. into which both the spin-on filter may be screwed and the drive taken either directly or in tandem with another auxiliary such as the compressor from the engine to the gear type pump. Delivery pressure from the fuel pump will be subsequently boosted to the injection pressure by the cam and rocker mechanism so it does not have to be more than 1750 kN m2 as compared with well over 70 000 kN m2 for injectors in which the valves have to be opened by hydraulic pressure supplied from an external pump. The governor which is of the rotating twin bob-weight type regulates only maximum and idling speeds. It does this by moving a spool valve axially between stops to limit the rate of supply of fuel at its two extreme positions. From zero load up to maximum speed at any load the driver effects control through the accelerator pedal which actuates the throttle in the fuel delivery line. When maximum .

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