1
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Regulator – Exhaust gas recirculation system vacuum.
2
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Valve –Exhaust gas recirculation.
3
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Transducer – Exhaust gas recirculation.
4
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Pipe – Exhaust gas recirculation system pressure.
The engine emission control system comprises an exhaust gas recirculation valve, pipe, exhaust gas recirculation transducer, and an exhaust gas recirculation vacuum regulator. The engine emission control system allows a measured quantity of exhaust gas to be directed back to the inlet manifold. The exhaust gas is introduced to the incoming charge in the manifold, where it dilutes the air fuel mixture and lowers the peak gas temperature, reducing nitrogen oxide exhaust emissions. The gas is drawn through the pipe from the exhaust to the inlet manifold via the exhaust gas recirculation valve. The valve is vacuum operated and is controlled via an input from the powertrain control module. Further control of the system is provided by the vacuum regulator and pressure transducer. Their function is to control the amount of vacuum being applied to the valve. Both these functions are managed by the powertrain control module.
