Current regulations have almost made mandatory closed loop control of the
air–fuel mixture in conjunction with a three-way catalytic converter. It was
under discussion that a lambda value of 1 should become compulsory for all
operating conditions, but this was not agreed.
Lambda control is a closed loop feedback system in that the signal from a
lambda sensor in the exhaust can directly affect the fuel quantity injected.
The lambda sensor is described in more detail in Chapter 1. Figure 9.12 shows
a block diagram of a lambda control system.
A graph to show the effect of lambda control and a ...
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