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E. ratio I ) of an internal combustion engine is mostly controlled by adjusting the duration of opening of each of the fuel injector valves. The adjustment of the ratio h precisely enough to enable the catalytic converter to operate effectively, converting all three CO, HC and NO, into harmless substances, is mostly achieved by controlling the engine aidfuel ratio by means of a I-sensor (similar to this described in fig. trOf) (fig. 12). The h-sensor responds to changes in exhaust-gas composition resulting from deviations from h=l in the intake mixture by producing an abrupt voltage jump in its output signal, a high voltage corresponding to a rich intake mixture (h less than 1).

1 Robert Bosch GmbH In DE2328459 (1975) the company Robert Bosch GmBH proposed one of the earliest methods for monitoring a catalytic converter by installing two oxygen sensors, one upstream and one downstream of the converter. A warning signal is produced when a voltage difference indication between the downstream and the upstream sensors of the oxygen concentration in the exhaust gases as a function of aidfuel ratio 1 passes over a predetermined threshold (fig. 15, lines 28,29), showing that the catalyst cannot oxidize anymore the impurities and must be replaced.

Under net reducing conditions, CeO2 fhctions as an oxidizing agent according to the following reactions: The interaction of Ce oxides with HC is of minor importance. The oxygen storage availability is apparently a function of the washcoat Ce content and dispersion. Moreover, the stored oxygen available to react under operating conditions is a function of the local temperature and reduction-oxidation environment ([9]). 25 Introduction Monitoring and diagnosing the efJiciency of catalytic converters The catalyst within the catalytic converters has a limited lifetime so that the efficiency of the converter deteriorates with age and use.

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