| 摘要 |
a method of operating an Exhaust Gas Recirculation (EGR) system (300) of a thermal energy source, eg a Diesel engine 110, the EGR system (300) comprising an EGR circuit (315) and an EGR cooler (310), the EGR cooler (310) being connected in an heat exchanging relationship with an EGR coolant circuit (520) equipped with an EGR coolant pump (530), the method comprising the steps of (i) monitoring a parameter (TEGRcool) representative of a temperature of the coolant in the EGR coolant circuit (520), eg by use of a temperature sensor 540, and (ii) operating the EGR coolant pump (530) on the basis of the parameter (TEGRcool) and of a target value thereof (TEGRtgt), preferably by closed-loop control performed by ECU 450. The EGR system may include a bypass 307 with a bypass valve 307 which may be opened if the thermal load of the thermal energy source is lower than a target value. |
