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Computers as Components, 3rd Edition by Marilyn Wolf

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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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