The invention relates to a method for controlling a waste-heat utilization system (20) for an internal combustion engine (10) of a vehicle, wherein the waste-heat utilization system (20) has at least one expander (22), which can transmit torque to the internal combustion engine (10) and which can be bypassed by means of a bypass flow path (25), at least one evaporator (21), and at least one pump (24) for an operating medium, and wherein at least the evaporator (21) is arranged in the region of the exhaust gas system (11) of the internal combustion engine (10). The expander (22), which can be operated in several operating modes, has a driving connection to a secondary drive shaft (19) of the internal combustion engine in at least one operating mode. An operating mode of the waste-heat utilization system (20) is selected by a control device (30) on the basis of at least one input variable and the waste-heat utilization system (20) is operated in said operating mode. The input variable is selected by the control device (30) from the group consisting of expander rotational speed (n), gear information (GI), coasting information (CI), and pressure (p.sub.1, p.sub.2) and temperature (T.sub.1, T.sub.2) of the operating medium upstream or downstream of the expander (22). A first operating mode (1) is associated with a warm-up phase of the expander (22) and a second operating mode (2) is associated with a normal operating phase of the expander (22). In the first operating mode, the bypass flow path (25) is opened and the expander (22) is not connected to a secondary drive shaft (19) of the internal combustion engine (10). In the second operating mode, the bypass flow path (25) is closed and the expander (22) is connected to the internal combustion engine (10). The second operating mode (2) is selected if the pressure (p.sub.2) and/or the temperature (T.sub.2) of the operating medium downstream of the expander (22) exceeds a defined value.

A waste heat recovery system includes an evaporator that evaporates a coolant in a liquid phase by using waste heat from an internal combustion engine, a turbine that rotates by receiving the coolant in a gas phase having passed through the evaporator, a condenser that condenses the coolant in the gas phase having passed through the turbine into the coolant in the liquid phase, and a pump that supplies the coolant in the liquid phase fed from the condenser to the evaporator. The waste heat recovery system further includes a coupling mechanism that constantly couples a rotating shaft of the turbine to a crankshaft of the internal combustion engine, and the crankshaft is directly coupled to a vehicle transmission.

A power system includes: an internal combustion engine; a motor to perform power running; a generator to perform power generating operation and the power running; a power transmission mechanism via which the internal combustion engine, the motor, and the generator are connected to drive a driven load by at least one of the internal combustion engine, the motor, and the generator and to perform power transmission between the internal combustion engine and the generator; and a processor configured to perform a first control process to control the motor to perform the power running so that the driven load is driven only by the motor and to perform a second control process to control both the motor and the generator to perform the power running so that the driven load is driven by both of the motor and the generator.

A power system includes: an internal combustion engine; a motor to perform power running; a generator to perform power generating operation and the power running; a power transmission mechanism via which the internal combustion engine, the motor, and the generator are connected to drive a driven load by at least one of the internal combustion engine, the motor, and the generator and to perform power transmission between the internal combustion engine and the generator; and a processor configured to perform a first control process to control the motor to perform the power running so that the driven load is driven only by the motor and to perform a second control process to control both the motor and the generator to perform the power running so that the driven load is driven by both of the motor and the generator.

A hydrogen/oxygen stoichiometric combustion turbine system includes: a high-pressure steam turbine (2); a low-pressure steam turbine (3); and a heater (5) disposed between the high-pressure and low-pressure steam turbines. The heater (5) has a combustion portion (53) in which stoichiometric combustion of hydrogen and oxygen is caused, and a mixing portion (55) configured to mix discharged steam (S4) from the high-pressure steam turbine (2) with combustion gas (R) from the combustion portion (53) and to supply the obtained product to the low-pressure steam turbine (3).

A system includes a compressor that compresses a fluid. The system also includes an internal combustion engine including a thermomechanical cycle. The thermomechanical cycle converts excess heat from the internal combustion engine to mechanical power to drive the compressor.

A system includes a compressor that compresses a fluid. The system also includes an internal combustion engine including a thermomechanical cycle. The thermomechanical cycle converts excess heat from the internal combustion engine to mechanical power to drive the compressor.

A transmission system selectively coupled to an engine crankshaft of an internal combustion engine arranged on a vehicle includes a waste heat recovery (WHR) system, a brake assembly and a phase-change thermal heat storage system. The WHR system selectively circulates a WHR fluid in the transmission system. The brake assembly selectively couples a transmission output shaft to a drive axle. The brake assembly is configured to operate in a braking mode that retards relative rotation between the transmission output shaft and the drive axle while generating heat. The heat storage system includes a housing defining at least one cavity and a fluid transfer manifold. A phase-change material is disposed in the cavity that is configured to change phase during the braking mode. The WHR system circulates the WHR fluid through the fluid transfer manifold collecting braking heat to be used at a later time in the form of driveline power.

A transmission system selectively coupled to an engine crankshaft of an internal combustion engine arranged on a vehicle includes a waste heat recovery (WHR) system, a brake assembly and a phase-change thermal heat storage system. The WHR system selectively circulates a WHR fluid in the transmission system. The brake assembly selectively couples a transmission output shaft to a drive axle. The brake assembly is configured to operate in a braking mode that retards relative rotation between the transmission output shaft and the drive axle while generating heat. The heat storage system includes a housing defining at least one cavity and a fluid transfer manifold. A phase-change material is disposed in the cavity that is configured to change phase during the braking mode. The WHR system circulates the WHR fluid through the fluid transfer manifold collecting braking heat to be used at a later time in the form of driveline power.

A control system controls a temperature of a fuel which is supplied to a combustor of a gas turbine via a fuel gas heater, which heats the fuel of the gas turbine, by adjusting a flow rate of heated water which is supplied to the fuel gas heater. The control system includes a water flow rate adjusting unit that adjusts the flow rate of the heated water which is supplied to the fuel gas heater based on a difference between a target temperature of the fuel and the temperature of the fuel on an outlet side of the fuel gas heater.