Basics
Closed-loop ignition timing
The ignition system described in the foregoing section is an open-loop system. The major disadvantage of open loop…
July 16, 2021 · Prabhu TLBasics
Basics
Electronic ignition control
An engine must be provided with fuel and air in correct proportions and the means to ignite this…
July 16, 2021 · Prabhu TLBasics
EGR control
A second electronic engine control subsystem is the control of exhaust gas that is recirculated back to the…
July 16, 2021 · Prabhu TLBasics
Idle air control
A block diagram of a simplified idle speed control system is shown in Fig. b. Idle speed is…
July 16, 2021 · Prabhu TLBasics
Idle speed control
Idle speed control is used by some manufacturers to prevent engine stall during idle. The goal is to…
July 16, 2021 · Prabhu TLBasics
Deceleration leaning
During periods of light engine load and high RPM such as during coasting or hard deceleration, the engine…
July 16, 2021 · Prabhu TLBasics
Closed-loop control
Perhaps the most important adjustment to the fuel injector pulse duration comes when the control is in the…
July 16, 2021 · Prabhu TLBasics
Open-loop control
For a warmed-up engine, the controller will operate in an open loop if the closed-loop mode is not…
July 16, 2021 · Prabhu TLBasics
Engine warm-up
While the engine is warming up, an enriched air/fuel ratio is still needed to keep it running smoothly,…
July 16, 2021 · Prabhu TLBasics
Engine crank
While the engine is being cranked, the fuel control system must provide an intake air/fuel ratio of anywhere…
July 16, 2021 · Prabhu TL