Peak temp of combustion

[Phil Lamovie]

Perfect topic for flame war !!!

The highest combustion temps occur at Lambda 1.1

This also coincides with peak NOx development as NOx is
temperature dependent.

Unfortunately for petrol it is also the highest thermal eff.

This gives rise to the expression " lean cruise " a trick the
manufacturers use to artificially raise the fuel economy numbers.

The drive cycle test do not use a speed higher than 92 km/hr so the
script kiddies at the ECU mapping centers write little algs such as

is vehicle speed 95 km/hr +
is the engine temp over 65 deg/C
has the throttle movt. been less than 5% per 10 sec
is the rate of accel less than 5%
goto lean burn table

Reason for the table is simple. The A/F ratio is beyond the range of
that technological slight of hand the oxygen " switch ".

Phil



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