June 2012
Intermediate to advanced
528 pages
15h 40m
English
Content preview from Computers as Components, 3rd Edition
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6.11 Design Example: Engine Control Unit
In this section, we design a simple engine control unit (ECU). This unit controls the operation of a fuel-injected engine based on several measurements taken from the running engine.
6.11.1 Theory of Operation and Requirements
We will design a basic engine controller for a simple fuel injected engine [Toy]. As shown in Figure 6.36, the throttle is the command input. The engine measures throttle, RPM, intake air volume, and other variables. The engine controller computes injector pulse width and spark. This design doesn’t compute all the outputs required by a real engine—we only concentrate on a few essentials. We also ignore the different modes of engine operation: warm-up, idle, cruise, etc. Multi-mode ...
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