4

en g

en g

10:1 Rich

12:1 14:1 16:1 Air-fuel ratio (Retro! engine)

18:1 20:1 Weak

Fig. 5.26 Oxygen in exhaust versus air-fuel ratio

10:1 Rich

12:1 14:1 16:1 Air-fuel ratio (Retro! engine)

18:1 20:1 Weak

Fig. 5.26 Oxygen in exhaust versus air-fuel ratio air-fuel ratio is kept within the required limits. It is common practice to refer to the air-fuel ratio that gives chemically correct combustion as lambda = 1. If the mixture is rich, lambda is less than 1 (probably lambda = 0.97), and if the mixture is weak, lambda is greater than 1 (probably lambda = 1.03). For this reason, the exhaust gas oxygen sensor is often referred to as a lambda sensor.

actual air-fuel ratio

chemically correct air-fuel ratio

There are two types of EGO sensor currently in use. One operates on the principle of a voltaic cell, i.e. it is 'chemo-voltaic', and the other relies on the changes in electrical resistance of a material in response oxygen, i.e. it is 'chemo-resistive'.

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