
Fuel control
328
This information forms part of a read only memory (ROM) chip in the ECU.
When the ECU has determined the look-up value of the fuel required (injector
open time), corrections to this gure can be added for battery voltage,
temperature, throttle change or position and fuel cut off.
Idle speed, and fast idle, are also controlled by the ECU and a suitable
actuator. It is also possible to have a form of closed loop control with electronic
fuel injection. This involves a lambda sensor to monitor exhaust gas oxygen
content. This allows very accurate control of the mixture strength, as the
oxygen content of the exhaust is proportional ...