AutomobileMag Forums

This is a copy of http://www.horsepower.lx.ro
The electrical control system consists of the ECU, along with the following sensors:
a) Throttle potentiometer - informs the ECU of the throttle position, and the rate of throttle opening/closing.
b) Coolant temperature sensor - informs the ECU of engine temperature.
c) Inlet air temperature sensor - informs the ECU of the temperature of the air passing through the throttle housing.
d) Lambda sensor - informs the ECU of the oxygen content of the exhaust gases (explained in PartD of  this Chapter).
e) Crankshaft sensor - informs the ECU of crankshaft position and speed of rotation.
f) Manifold Absolute Pressure (MAP) sensor - informs the ECU of the load on the engine (expressed in terms of inlet manifold vacuum).
g) Vehicle speed sensor - informs the ECU of the vehicle speed. All the above signals are analysed by the ECU which selects the fuelling response appropriate to those values. The ECU controls the fuel injectors (varying the pulse width – the length of time the injectors are held open – to provide a richer or weaker mixture, as appropriate). The mixture is constantly varied by the ECU, to provide the best setting for cranking, starting (with either a hot or cold engine), warm-up, idle, cruising and acceleration