fuel type OPEL ASTRA 1991 Electronic Workshop Manual

Downloaded from www.Manualslib.com manuals search engine 7.2 AIR MASS MEASUREMENT
As we have seen previously the principle of fuel injection
is based on measuring the air mass entering the engine and
calculating the fuel mass required to obtain an A/F ratio of
14.7:1. A number of possible methods exist for measuring
the air mass, but only the speed-density method used for
this TBi system will be described in detail.
Some of the possible methods are:
a) Speed-density
b) Throttle butterfly angle
c) Flap or vane type
d) Hot-wire meter
e) Hot-film meter
f) K rm n vortex ultrasonic meter.