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Automotive Control Systems by Huei Peng, A. Galip Ulsoy, Melih Çakmakci

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6 Air–Fuel Ratio Control

Mathematical models such as those described in Chapter 3 can be used as the basis for engine control-system design (Kiencke and Nielsen 2005). This chapter discusses control of the air–fuel mixture ratio that enters the cylinders (i.e., the combustion chamber) (Grizzle et al. 1990, 1991; Kiencke 1988; Kuraoka et al. 1990; Moklegaard et al. 2001; Ohyama 1994; Sweet 1981).

6.1 Lambda Control

Air–fuel ratio control sometimes is referred to as lambda control because the ratio is defined as follows:
(6.1)
where λ is the normalized air–fuel ratio, a is the mass airflow into the engine, f is the metered-fuel mass flow ...

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