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A method of operating a generator arrangement includes selecting an operating mode as a function of at least one of: a speed of an engine, a temperature of at least a portion of the engine, a property of an exhaust fluid of the engine, and whether an engine braking command signal is received by the

A method of operating a generator arrangement includes selecting an operating mode as a function of at least one of: a speed of an engine, a temperature of at least a portion of the engine, a property of an exhaust fluid of the engine, and whether an engine braking command signal is received by the controller; controlling the flow of fluid from a first engine outlet to a first turbine by setting, based on the selected operating mode, an operating condition of a first flow control mechanism, the first turbine being part of a turbocharger having a compressor in fluid flow communication with an engine inlet; and controlling the flow of fluid from a second engine outlet to a second turbine by setting, based on the selected operating mode, an operating condition of a second flow control mechanism, the second turbine being parallel to the first turbine and being part of an electrical generator.

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1. A turbo-compound engine comprising: a turbocharger having a compressor configured to be placed in fluid flow communication with an engine inlet, and a first turbine configured to be placed in fluid flow communication with a first engine outlet,an electrical generator having a second turbine confi

1. A turbo-compound engine comprising: a turbocharger having a compressor configured to be placed in fluid flow communication with an engine inlet, and a first turbine configured to be placed in fluid flow communication with a first engine outlet,an electrical generator having a second turbine configured to be placed in fluid flow communication with the first engine outlet or a second engine outlet,the first and second turbines being parallel to one another, a first flow control mechanism configured to control the flow of fluid from the first engine outlet to the first turbine,a second flow control mechanism configured i) if the second turbine is placed in fluid communication with the first engine outlet to control the flow of fluid from the first engine outlet to the second turbine; or ii) if the second turbine is placed in fluid flow communication with the second engine outlet, to control the flow of fluid from the second engine outlet to the second turbine; anda controller configured to select an operating mode as a function of at least one of: a speed of an engine, a temperature of at least a portion of the engine, a property of an exhaust fluid of the engine, and whether an engine braking command is received by the controller, the controller being configured to control the first and second fluid control mechanisms as a function of the selected operating mode, wherein the controller is configured such that when the engine operates at an idling speed and when at least a portion of the engine is at a temperature which is less than a normal operating temperature of the portion of the engine, said selecting of an operating mode comprises selecting a cold idle operating mode;wherein in the cold idle operating mode, said controller is configured to control the first flow control mechanism to close the first flow control mechanism to prevent the exhaust fluid passing through and bypassing the first turbine; andwherein in the cold idle operating mode, said controller is configured to control the second flow control mechanism to partially or fully open the second flow control mechanism such that fluid flows through the second turbine. 2. A turbo-compound engine according to claim 1, wherein the first engine outlet and the second engine outlet are one and the same. 3. A turbo-compound engine according to claim 1, wherein the first flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve. 4. A turbo-compound engine according to claim 1, wherein the second flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve. 5. A turbo-compound engine comprising: a turbocharger having a compressor configured to be placed in fluid flow communication with an engine inlet, and a first turbine configured to be placed in fluid flow communication with a first engine outlet,an electrical generator having a second turbine configured to be placed in fluid flow communication with the first engine outlet or a second engine outlet,the first and second turbines being parallel to one another,a first flow control mechanism configured to control the flow of fluid from the first engine outlet to the first turbine,a second flow control mechanism configured i) if the second turbine is placed in fluid flow communication with the first engine outlet, to control the flow of fluid from the first engine outlet to the second turbine; or ii) if the second turbine is placed in fluid flow communication with the second engine outlet, to control the flow of fluid from the second engine outlet to the second turbine; anda controller configured to select an operating mode as a function of at least one of: a speed of an engine, a temperature of at least a portion of the engine, a property of an exhaust fluid of the engine, and an engine braking command received by the controller, the controller being configured to control the first and second fluid control mechanisms as a function of the selected operating mode, wherein the controller is configured such that when the engine operates at idling speed and when at least a portion of the engine is at a temperature which is a normal operating temperature of the portion of the engine, said selecting of an operating mode comprises selecting an idling operating mode;wherein in the idling operating mode, said controller is configured to control the first flow control mechanism to fully open the first flow control mechanism such that fluid passes can pass through the first turbine or bypass the first turbine; andwherein in the idling operating mode, said controller is configured to control the second flow control mechanism to fully open the second flow control mechanism such that fluid passes through the second turbine-or bypass the second turbine. 6. A turbo-compound engine according to claim 5, wherein the first engine outlet and the second engine outlet are one and the same. 7. A turbo-compound engine according to claim 5, wherein the first flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve. 8. A turbo-compound engine according to claim 5, wherein the second flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve. 9. A turbo-compound engine comprising; a turbocharger having a compressor configured to be placed in fluid flow communication with an engine inlet, and a first turbine configured to be placed in fluid flow communication with a first engine outlet,an electrical generator having a second turbine configured to be placed in fluid flow communication with the first engine outlet or a second engine outlet,the first and second turbines being parallel to one another,a first flow control mechanism configured to control the flow of fluid from the first engine outlet to the first turbine,a second flow control mechanism configured i) if the second turbine is placed in fluid flow communication with the first engine outlet, to control the flow of fluid from the first engine outlet to the second turbine; or ii) if the second turbine is placed in fluid flow communication with the second engine outlet, to control the flow of fluid from the second engine outlet to the second turbine; anda controller configured to select an operating mode as a function of at least one of: a speed of an engine, a temperature of at least a portion of the engine, a property of an exhaust fluid of the engine, and an engine braking command received by the controller, the controller being configured to control the first and second fluid control mechanisms as a function of the selected operating mode; wherein said controller is configured such that when the engine operating speed is increasing, said selecting of an operating mode comprises selecting an accelerating operating mode;wherein in the accelerating operating mode, said controller is configured to control the first flow control mechanism to fully open the first flow control mechanism such that fluid passes through the first turbine; andwherein in the accelerating operating mode, said controller is configured to control the second flow control mechanism to fully close the second flow control mechanism to prevent the exhaust fluid passing through and bypassing the second turbine. 10. A turbo-compound engine according to claim 9, wherein the first engine outlet and the second engine outlet are one and the same. 11. A turbo-compound engine according to claim 9, wherein the first flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve. 12. A turbo-compound engine according to claim 9, wherein the second flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve. 13. A turbo-compound engine comprising: a turbocharger having a compressor configured to be placed in fluid flow communication with an engine inlet, and a first turbine configured to be placed in fluid flow communication with a first engine outlet,an electrical generator having a second turbine configured to be placed in fluid flow communication with the first engine outlet or a second engine outlet, the first and second turbines being parallel to one another,a first flow control mechanism configured to control the flow of fluid from the first engine outlet to the first turbine,a second flow control mechanism configured i) if the second turbine is placed in fluid flow communication with the first engine outlet, to control the flow of fluid from the first engine outlet to the second turbine; or ii) if the second turbine is placed in fluid flow communication with the second engine outlet, to control the flow of fluid from the second engine outlet to the second turbine; anda controller configured to select an operating mode as a function of at least one of: a speed of an engine, a temperature of at least a portion of the engine, a property of an exhaust fluid of the engine, and an engine braking command received by the controller, the controller being configured to control the first and second fluid control mechanisms as a function of the selected operating mode; wherein the controller is configured such that when the engine operating speed is a constant speed and is greater than the idling speed of the engine, said selecting of an operating mode comprises selecting a steady state operating mode; andwherein in the steady state operating mode, said controller is configured to control the second flow control mechanism to at least partially open the second flow control mechanism thereby opening a bypass path around the first turbine via the second turbine, such that gas flowing through the bypass path passes through from the first engine outlet to an arrangement outlet via the second turbine and without passing through the first turbine. 14. A turbo-compound engine according to claim 13, wherein the first engine outlet and the second engine outlet are one and the same. 15. A turbo-compound engine according to claim 13, wherein the first flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve. 16. A turbo-compound engine according to claim 13, wherein the second flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve. 17. A turbo-compound engine comprising: a turbocharger having a compressor configured to be placed in fluid flow communication with an engine inlet, and a first turbine configured to be placed in fluid flow communication with a first engine outlet,an electrical generator having a second turbine configured to be placed in fluid flow communication with the first engine outlet or a second engine outlet, the first and second turbines being parallel to one another,a first flow control mechanism configured to control the flow of fluid from the first engine outlet to the first turbine,a second flow control mechanism configured i) if the second turbine is placed in fluid flow communication with the first engine outlet, to control the flow of fluid from the first engine outlet to the second turbine; or ii) if the second turbine is placed in fluid flow communication with the second engine outlet, to control the flow of fluid from the second engine outlet to the second turbine; anda controller configured to select an operating mode as a function of at least one of: a speed of an engine, a temperature of at least a portion of the engine, a property of an exhaust fluid of the engine, and an engine braking command received by the controller, the controller being configured to control the first and second fluid control mechanisms as a function of the selected operating mode; wherein the controller is configured such that when an engine braking command signal is received by the controller, said selecting of an operating mode comprises selecting an engine braking operating mode; andwherein in the engine braking operating mode, said controller is configured to control the first flow control mechanism to at least partially close the first flow control mechanism so as to reduce the flow of exhaust gas through the first turbine and thereby increase the pressure of fluid in the first engine outlet, and hence increase the back pressure of the fluid on the engine. 18. A turbo-compound engine according to claim 17, wherein the first engine outlet and the second engine outlet are one and the same. 19. A turbo-compound engine according to claim 17, wherein the first flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve. 20. A turbo-compound engine according to claim 17, wherein the second flow control mechanism comprises one of a variable geometry turbine mechanism, a valve and a wastegate valve.