Abstract: A sound generator (1) includes a casing (10) with at least one exhaust gas inlet (11) and at least one exhaust gas outlet (12) that is different from the at least one exhaust gas inlet (11) and at least one electro-acoustical transducer (20). The electro-acoustical transducer (20) is configured to produce sound in dependence on an electrical control signal. The electro-acoustical transducer (20) is located within the casing or directly attached to the casing. An active noise control system (9) includes the sound generator (1). A vehicle (8) with an internal combustion engine (6) includes the active noise control system (9).

Abstract: A sound generator (1) includes a casing (10) with at least one exhaust gas inlet (11) and at least one exhaust gas outlet (12) that is different from the at least one exhaust gas inlet (11) and at least one electro-acoustical transducer (20). The electro-acoustical transducer (20) is configured to produce sound in dependence on an electrical control signal. The electro-acoustical transducer (20) is located within the casing or directly attached to the casing. An active noise control system (9) includes the sound generator (1). A vehicle (8) with an internal combustion engine (6) includes the active noise control system (9).

Abstract: A method for controlling an internal combustion engine having an EGR circuit including an exhaust gas recirculation valve for diverting exhaust gas from an engine exhaust to an engine intake includes ascertaining a predefined threshold based on at least one engine operating condition and preventing the EGR valve from opening if the at least one engine operating condition is below the predefined threshold to reduce or eliminate visible black smoke which may occur during transient conditions. In one embodiment, the engine operating condition represents EGR boost pressure.

Abstract: A system and method for diagnosing a component failure in an internal combustion engine having an exhaust gas recirculation system and a variable geometry turbocharger for diverting exhaust gas from an engine exhaust to an engine intake include determining whether the engine is operating in boost control mode or EGR control mode, comparing EGR flow rate to a threshold corresponding to the current control mode, generating a fault if the EGR flow rate is outside an acceptable operating range based on the threshold for a first predetermined time period, and operating in boost control mode if the fault persists for a second predetermined time period. In one embodiment, the system and method determine that the engine is operating in the EGR control mode with the threshold corresponding to a minimum EGR flow rate and determine whether the EGR flow rate exceeds the threshold.

Abstract: A method for controlling an internal combustion engine having an EGR circuit including an exhaust gas recirculation valve for diverting exhaust gas from an engine exhaust to an engine intake includes ascertaining a predefined threshold based on at least one engine operating condition and preventing the EGR valve from opening if the at least one engine operating condition is below the predefined threshold to reduce or eliminate visible black smoke which may occur during transient conditions. In one embodiment, the engine operating condition represents EGR boost pressure.