Basics 1 min read
Automatic system adjustment
Another important feature of microcomputer engine control systems is their ability to be programmed to adapt to parameter changes. Many…
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Basics 1 min read
Evaporative emissions canister purge
During engine-off conditions, the fuel stored in the fuel system tends to evaporate into the atmosphere. To reduce these HC…
Basics 2 min read
Closed-loop ignition timing
The ignition system described in the foregoing section is an open-loop system. The major disadvantage of open loop control is…
Basics 5 min read
Electronic ignition control
An engine must be provided with fuel and air in correct proportions and the means to ignite this mixture in…
Basics 2 min read
EGR control
A second electronic engine control subsystem is the control of exhaust gas that is recirculated back to the intake manifold.…
Basics 1 min read
Idle air control
A block diagram of a simplified idle speed control system is shown in Fig. b. Idle speed is detected by…
Basics 2 min read
Idle speed control
Idle speed control is used by some manufacturers to prevent engine stall during idle. The goal is to allow the…
Basics 1 min read
Deceleration leaning
During periods of light engine load and high RPM such as during coasting or hard deceleration, the engine operates with…
Basics 4 min read
Closed-loop control
Perhaps the most important adjustment to the fuel injector pulse duration comes when the control is in the closed-loop mode.…
Basics 3 min read
Open-loop control
For a warmed-up engine, the controller will operate in an open loop if the closed-loop mode is not available for…
Basics 3 min read
Engine warm-up
While the engine is warming up, an enriched air/fuel ratio is still needed to keep it running smoothly, but the…
Basics 1 min read
Engine crank
While the engine is being cranked, the fuel control system must provide an intake air/fuel ratio of anywhere from 2:1…