owners manual Mazda 5

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Emission System 2.0 MZR-CD Engine Regeneration Process • Due a to the effect of the catalytic coating the diesel particles are burnt off above temperature of 500 °C. Since the exhaust gas temperature during normal driving is between 150…400 °C (depending on the engine operating conditions), it must be increased artificially by external intervention from the engine management system to start the regeneration process. • If regeneration of the DPF is required, the PCM checks whether the engine operating re suitable to start the regeneration process. If the requirements for conditions a regeneration are met, the PCM performs the following measures to artificially increase the exhaust gas temperature: e – Closing the EGR valve to increase the combustion temperature by highering th ortion of the cylinder charge oxygen prop – Closing the ISV partially to increase the combustion temperature by reducing the excess air – Performing an early post-injection to increase the combustion temperature by burning an additional fuel amount – Performing two late post-injections to increase the exhaust gas temperature by burning fuel in the oxidation catalytic converter • By these measures the minimum exhaust gas temperature of 150 °C (at low engine load and engine speed) is increased to 500 °C and regenerations starts. Then the PCM monitors the regeneration process using the signals from the DPF differential pressure sensor and from the exhaust gas temperature sensors. Control over the regeneration process is critically important since the DPF is damaged when its temperature exceeds 1000 °C. • The regeneration process takes up to 15 min. When regeneration has started it will be completed regardless of the engine operating conditions. It is only stopped when the engine is shut off. In this case, the regeneration process is started again once the required operating conditions are met. 01-78 Service Training Mazda5

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