8.11 Strategies for emission control in internal combustion engines. There are three basic strategies for pollution cont

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8 11 Strategies For Emission Control In Internal Combustion Engines There Are Three Basic Strategies For Pollution Cont 1 (99.94 KiB) Viewed 10 times

8.11 Strategies for emission control in internal combustion engines. There are three basic strategies for pollution control in exhaust systems of vehicles: (a) An oxygen sensor measures the oxygen level at the inlet port of the catalytic converter. (b) An oxygen sensor measures the oxygen level at the outlet port of the catalytic converter. (c) An oxygen sensor measures the oxygen level at the inlet port of the catalytic converter and a second oxygen sensor measures the oxygen level at the outlet port. In (a) and (b), the output of the sensor is used to control the oxygen levels at the corresponding port. In (c) the differential output of the two sensors is used to keep the outlet oxygen level in the required range. Assuming the optimal oxygen level at the intake varies between 6% and 8%, at the outlet between 0.1% and 1% and ambient level is 22% oxygen: discuss the three methods in terms of: (a) Span and range. (b) The ability of each method to monitor the performance of the catalytic converter.