Abstract: In an overspeed protection apparatus for a gas turbine engine having a turbine rotated by combustion gas injected from a combustion chamber to drive a compressor, a fuel shutoff valve to shut off fuel to be supplied to the engine and a controller controlling operation of the fuel shutoff valve based on a turbine rotational speed to protect the turbine from overspeed, an outlet pressure of the compressor is detected and compared with a threshold value when a shutoff command is outputted, and the fuel shutoff valve is determined to be failed when the detected pressure is not less than the threshold value, thereby enabling to promptly detect the fuel shutoff valve failure without additional installing sensor, thereby enhancing the reliability.

Abstract: In an overspeed protection apparatus for a gas turbine engine having a turbine rotated by combustion gas injected from a combustion chamber to drive a compressor, a fuel shutoff valve to shut off fuel to be supplied to the engine and a controller controlling operation of the fuel shutoff valve based on a turbine rotational speed to protect the turbine from overspeed, an outlet pressure of the compressor is detected and compared with a threshold value when a shutoff command is outputted, and the fuel shutoff valve is determined to be failed when the detected pressure is not less than the threshold value, thereby enabling to promptly detect the fuel shutoff valve failure without additional installing sensor, thereby enhancing the reliability

Abstract: A Rankine cycle system includes an evaporator for heating water with thermal energy of exhaust gas of an engine for generating steam with a displacement type expander for converting thermal energy into mechanical energy. A temperature controller manipulates the amount of water supplied to the evaporator so that the temperature of the steam supplied from the evaporator to the expander coincides with a target temperature. A pressure controller manipulates the rotational speed of the expander by changing a load of the expander so that the pressure of the steam supplied from the evaporator to the expander coincides with a target pressure. The temperature controller and/or the pressure controller continue to control the amount of water supplied to the evaporator and/or the rotational speed of the expander in set ranges at least in a state in which the engine has stopped and the thermal energy of the exhaust gas has disappeared.

Abstract: A Rankine cycle system includes an evaporator for heating water with thermal energy of exhaust gas of an engine so as to generate steam; a displacement type expander for converting the thermal energy of the steam generated by the evaporator into mechanical energy; a temperature controller for manipulating the amount of water supplied to the evaporator so that the temperature of the steam supplied from the evaporator to the expander coincides with a target temperature; and a pressure controller for manipulating the rotational speed of the expander by changing a load of the expander so that the pressure of the steam supplied from the evaporator to the expander coincides with a target pressure. The temperature controller and the pressure controller control the amount of water supplied to the evaporator and/or the rotational speed of the expander according to at least an internal density of the evaporator.

Abstract: A Rankine cycle system includes: an evaporator for heating a liquid-phase working medium with thermal energy of exhaust gas of an engine so as to generate a gas-phase working medium; a displacement type expander for converting the thermal energy of the gas-phase working medium generated by the evaporator into mechanical energy; and a Rankine controller for manipulating an amount of liquid-phase working medium supplied to the evaporator so that the temperature of the gas-phase working medium supplied from the evaporator to the expander coincides with a target temperature, and for manipulating the rotational speed of the expander by changing a load of the expander so that the pressure of the gas-phase working medium supplied from the evaporator to the expander coincides with a target pressure.

Abstract: A motor/generator system is provided in which a casing (111) of a motor/generator (MG) is connected to a casing (15) of a displacement type expander of a Rankine cycle system, and a rotor (117) of the motor/generator (MG) is supported on a shaft end of an output shaft (32) extending from the expander to the interior of the motor/generator casing (111). Providing communication between an internal space of the expander casing (15), where steam that has leaked from an expansion chamber of the expander is present, and an internal space of the motor/generator casing (111) via a through hole (15a) enables the motor/generator (MG), which reaches a high temperature due to generation of heat in a coil (124), to be cooled by leaked steam that has entered via the through hole (15a), and covering the low temperature expander casing (15) with the high temperature motor/generator casing (111) enables the escape of heat from the expander casing (15) to be minimized, thereby enhancing the efficiency of the expander.