Abstract: A method for driving a hybrid compressor of an air conditioning system of a vehicle is provided. The vehicle includes a first drive source, and the air conditioning system includes an evaporator. Moreover, the hybrid compressor includes a second drive source, and the hybrid compressor is driven by the first drive source via an electromagnetic clutch or the second drive source, or combination thereof. The method includes the steps of engaging the electromagnetic clutch, detecting a temperature of air dispensed from the evaporator, and disengaging the electromagnetic clutch when the temperature of the air is equal to a predetermined temperature. The method also includes the step of activating the second drive source. Specifically the step of disengaging the electromagnetic clutch when the temperature of the air is equal to the predetermined temperature and the step of activating the second drive source is performed simultaneously or substantially simultaneously.

Abstract: A hybrid compressor system in a vehicle air conditioner includes a variable displacement hybrid compressor, a detector for detecting information for air conditioning, a thermal load calculator and a controller. The compressor is selectively driven by an engine and an electric motor. The calculator calculates a thermal load based on the detected information. The controller compares the thermal load with a predetermined value. The controller changes displacement of the compressor to a first predetermined displacement value and selects the engine as a drive source of the compressor when the thermal load is larger than the predetermined value. The controller changes the displacement of the compressor to a second predetermined displacement value that is smaller than the first predetermined displacement value and selects the electric motor as the drive source of the compressor when the thermal load is equal to, or smaller than the predetermined value.

Abstract: A cooling apparatus (12) for use on a vehicle includes a heat exchanger (13) in wich heat is removed from a heat load (11) by a coolant, characterised in that the cooling apparatus (12) also includes a first (15-28) and second (31-37) coolant supply means, the first coolant supply means (15-28) being adapted to receive a first coolant and supply the first coolant to the heat exchanger (13), the first coolant being available normal vehicle operation, and the second coolant supply means (31-37) being adapted to receive a second coolant and supply the second coolant to the heat exchanger (13), the second coolant being supplied by a fluid supply means (36), which is unavailable during normal vehicle operation.

Abstract: A hybrid compressor system has a hybrid compressor for compressing refrigerant. The compressor is selectively driven by one of a first drive source and a second drive source. The hybrid compressor system also includes a first one-way clutch, a driver for driving the second drive source, a sensor for detecting a rotational state of the first drive source and a controller. The first one-way clutch is arranged on a first power transmission path between the compressor and the first drive source for permitting power transmission from the first drive source to the compressor. The controller is electrically connected to the driver and the sensor. When a drive source of the compressor is switched from the second drive source to the first drive source, the controller orders the driver to stop the second drive source after the rotation of the first drive source is detected.

Abstract: A controlled compressor apparatus for idle-stopping vehicles that permits precise variable displacement control of a compressor and reduces power consumption when the compressor is motor-driven. The apparatus includes a battery-powered motor and a control unit for selecting the engine or the motor to drive the compressor and for controlling the displacement of the compressor. A current detector detects the magnitude of a current supplied to the motor. The control unit stores a relationship between the displacement and the current and controls the displacement based on the current detected by the current detector.

Abstract: A vehicle air-conditioning system with a motor driven compressor is control to suppress overheating of the electronic devices inside the compressor inverter and to suppress overheating of the battery. If the compressor intake refrigerant temperature is high when the compressor starts up, the maximum allowable rotational speed of the compressor is limited and the airflow rate of the blower fan is reduced by lowering the voltage of the blower fan motor. As a result, overheating of the electronic devices inside the compressor inverter is suppressed. Also, if the compressor intake refrigerant temperature is high when the compressor starts up, the load on the battery is lightened and overheating of the battery is suppressed by switching the source of the electric power supplied to the compressor from the battery to the motor generator.

Abstract: An air conditioning system for a vehicle includes a compressor driven by a first drive source or a second drive source, or a combination thereof, and an evaporator operationally connected to the compressor via a refrigerant circuit. The system also includes a blower for dispensing air into an interior of the vehicle via the evaporator. The blower is driven by the first drive source or the second drive source, or a combination thereof. Moreover, the system includes a controller for controlling the first drive source and the second drive source. Specifically, when a temperature of air dispensed from the evaporator is greater than a predetermined temperature and a speed of the vehicle is greater than a predetermined speed, the first drive source drives the compressor and the blower.

Abstract: A temperature control system for a vehicle includes an air-conditioning device (12) with a compressor device (14, 40) for compressing a working medium of the air-conditioning device (12). The compressor device (14, 40) can be driven by a first drive unit (18), preferably the driving motor (18) of a vehicle, and/or a second drive unit (42), whereby the second drive unit (42) comprises a Stirling motor (42).

Abstract: A selectively driven compressor for stopping the power generating operation of a motor when an internal combustion engine is operating to make it unnecessary to provide the motor that can withstand high voltage. The system reduces the load on the internal combustion engine. The system includes a pulley driven by a main drive source, an electric motor, which includes an armature and a field system, driven by a power source. The compressor is driven selectively by the pulley or the electric motor. The armature and the field system of the electric motor are independently supported. The pulley is mechanically connected to either of the armature and the field system, and the compressor is mechanically connected to the other.

Abstract: An air conditioning system for a vehicle includes a compressor. The vehicle includes a first drive source and the compressor includes a second drive source. The compressor is driven by the first drive source or the second drive source, or a combination thereof, and the second drive source includes an electrical power supply. The air conditioning system also includes a controller for selecting between the first drive source and the second drive source, such that when the compressor is active, the first drive source drives the compressor except when the vehicle is operating in a predetermined mode, a voltage of the electrical power supply is greater than or equal to a minimum electrical power supply voltage, and an amount of electric power consumed by the second drive source is less than a maximum electric power. For example, the predetermined mode may be an idle-stop mode.

Abstract: The method for controlling a hybrid air conditioning system of a direct coupled motor-driven hybrid electric vehicle includes detecting operating conditions of the air conditioning system; and controlling the hybrid air conditioning system. The hybrid air conditioning system includes a mechanical air conditioner driven by an engine and an electric air conditioner driven by electric power of a battery.

Abstract: An energy administration device serves for operating an absorption refrigerating device with different energy sources and includes an energy control unit (7) for controlling and selecting an energy source. It includes at least one gas operation unit (8 to 12) for operating said absorption refrigerating device with gas with a gas burner connected to a gas supply line, which can be controlled by a surveillance system. Said surveillance system is an ignition surveillance system and includes an ionisation sensor and/or UV sensor for surveying said gas flame of said gas burner (11).

Abstract: If a motor breaks down, an appropriate measure is taken according to the type pf the breakdown. If the breakdown is judged to be due to abnormal energization of the motor by electrical abnormality judgment means, a drive source for a hybrid compressor is secured while preventing an engine for traveling from stopping by compressor operation continuation means. If it is judged that the driven state of the motor is abnormal, the hybrid compressor is disconnected from the engine to protect the engine from mechanical abnormality of the hybrid compressor.

Abstract: An air-conditioning system for a vehicle including a refrigerant circuit and an engine, has a compressor in the refrigerant circuit, a battery, an electric motor and a mechanism operative to controllably connect and disconnect a power transmitting path between the engine and the motor. The motor is connected to drive the compressor when energized by the battery. A first controller is operative to control the electric power supplied to the motor from the battery. A capacity control mechanism is responsive to the controller to maintain the discharge capacity of the compressor below a predetermined value upon starting the engine by the motor.

Abstract: An air conditioning system for use in an over-the-road or off road vehicle is provided that allows operation during both engine on and engine off conditions. The system utilizes a variable speed, motor driven compressor controlled by an intelligent power generation management controller. This controller selects from one of the available sources of power on the vehicle to drive the compressor, and modulates the compressor speed and capacity based on operational parameters and source availability and depletion. The controller may also operate a coolant or air heater to provide heating to the interior compartments.

Abstract: An auxiliary power system for trucks, the power system having a small diesel engine coupled to an air conditioner compressor and an automotive style DC alternator. During hot weather the auxiliary engine rotates the air conditioner compressor to provide cool air to the truck accessories by load management controls alternator current output to provide DC power to accessories and for battery charging. When peak loads occur, the voltage is reduced into the field of the alternator in a form of load management wherein the truck batteries act as the power sink and the alternator is used to replenish any power drawn from the truck batteries when the peak demand is removed. During cold weather the engine coolant is used to cool the auxiliary engine and is circulated through a heat exchanger for warming of the truck interior, full capacity of the alternator is allowed accommodating the higher amp draws typical of cold weather diesel operation.

Abstract: An air conditioner for a vehicle uses a hybrid compressor (4) including a first compression mechanism driven by a first drive source (2) and a second compression mechanism driven by a second drive source (5), and a single discharge port connected to the first and the second compression mechanisms. The operation of the hybrid compressor is controlled by a controller (15) in accordance with a control mode. The controller has a first operation mode in which the first compression mechanism alone is driven, a second operation mode in which the second compression mechanism alone is driven, a third operation mode in which the first and the second compression mechanisms are simultaneously driven, and a fourth operation mode in which the first and the second compression mechanisms are simultaneously stopped. Depending upon various conditions, the controller selects, as the control mode, one of the first, the second, the third, and the fourth operation modes.

Abstract: A portable refrigerator kit for perishable pet products for keeping perishable pet products from spoiling while the user is out camping with one's pets.

Abstract: The engine drives the generator, which generates electric power. The power drives the compressor. Thus driven, the compressor cools the interior of the refrigerating chamber. When the engine stops, the output of the generator stops is no longer available. Then, the compressor is automatically driven by the power of the storage battery unit.

Abstract: A vehicle air-conditioning system with a motor driven compressor is control to suppress overheating of the electronic devices inside the compressor inverter and to suppress overheating of the battery. If the compressor intake refrigerant temperature is high when the compressor starts up, the maximum allowable rotational speed of the compressor is limited and the airflow rate of the blower fan is reduced by lowering the voltage of the blower fan motor. As a result, overheating of the electronic devices inside the compressor inverter is suppressed. Also, if the compressor intake refrigerant temperature is high when the compressor starts up, the load on the battery is lightened and overheating of the battery is suppressed by switching the source of the electric power supplied to the compressor from the battery to the motor generator.

Abstract: An energy administration device serves for operating an absorption refrigerating device with different energy sources and includes an energy control unit (7) for controlling and selecting an energy source. It includes at least one gas operation unit (8 to 12) for operating said absorption refrigerating device with gas with a gas burner connected to a gas supply line, which can be controlled by a surveillance system. Said surveillance system is an ignition surveillance system and includes an ionisation sensor and/or UV sensor for surveying said gas flame of said gas burner (11).

Abstract: An air conditioning system includes an engine driven compressor, and an independent electric motor driven compressor in a common housing. A controller adjusts the independent operation of the engine driven compressor and electric motor driven compressor in response to cooling demand input, and operational parameters of the engine and the battery, as well as optionally the electric motor driven compressor output and engine driven compressor output. A method of independently operating an engine driven compressor and electric motor driven compressor is also provided. The air-conditioning system, controller, and method are particularly useful in hybrid vehicles that use smaller displacement internal combustion engines and electric motor drive means.

Abstract: The air conditioning system can draw power from the utility power grid via an electrical line or from a battery. When the air conditioner is used during off peak hours, the air conditioner will draw power directly from the power grid. During peak usage, the air conditioner will be provided with power from the battery. The battery, in turn, is recharged from the power grid during off peak hours, such as during the night. In this way, the battery is kept fully charged and able to provide power during the peak period. The flow of the power to the air conditioner from the battery or line power is controlled by a timer switch. The flow of line power to the air conditioner or battery recharger during off peak hours is controlled by a recharge timer switch. The result is an air conditioning system reducing the strain on the power grid during peak usage and having an alternative power source, the battery, charged during off peak hours.

Abstract: An alternative powered evaporative cooler has a squirrel cage fan. A low voltage DC motor is provided to power the squirrel cage fan. A pulley system is coupled to the squirrel cage fan and the low voltage DC motor for transferring energy from the low voltage DC motor to rotate the squirrel cage fan. A low voltage DC power source is provided to power the low voltage DC motor.

Abstract: A motor drive-control device drive-controls a plurality of auxiliary devices with a single motor while securing a necessary capacity of the auxiliary devices side in correspondence with usage conditions. As such, in an air-conditioning system, necessary speeds of auxiliary devices such as a compressor and a warm water pump are calculated based on a necessary cooling capacity and a necessary heating capacity. The higher of these two necessary speeds is set as the motor speed for driving the auxiliary devices. The motor is thus controlled to this speed. Therefore, even if the air-conditioning heat load varies greatly due to changes in the usage environment, cooling and heating capacities necessary for air-conditioning temperature control can be obtained at all times.

Abstract: A controlled compressor apparatus for idle-stopping vehicles that permits precise variable displacement control of a compressor and reduces power consumption when the compressor is motor-driven. The apparatus includes a battery-powered motor and a control unit for selecting the engine or the motor to drive the compressor and for controlling the displacement of the compressor. A current detector detects the magnitude of a current supplied to the motor. The control unit stores a relationship between the displacement and the current and controls the displacement based on the current detected by the current detector.

Abstract: An all-electric transport refrigeration system receives its compressor drive motor power and all other electrical power from at least one on-board fuel cell. The fuel cell is able to power all of the refrigeration system electrical components. In one example a single fuel cell is used. Another example includes multiple fuel cells.

Abstract: A compressor is actuated by a motor and varies the displacement by the operation of an electromagnetic actuator. A drive unit of the compressor includes a power source, a motor drive circuit located on a power supply path between the motor and the power source, and an actuator drive circuit located on a power supply path between an electromagnetic actuator and the power source. The motor drive circuit drives the motor and the actuator drive circuit drives the electromagnetic actuator. The motor drive circuit and the actuator drive circuit share a smoothing circuit and a filter circuit. Therefore, the actuator drive circuit does not require its own smoothing circuit and a filter circuit. This reduces the number of parts of the drive unit, thereby reducing the size and the cost of the drive unit.

Abstract: A compressor with a built-in electric motor has a compression mechanism and the built-in electric motor which are housed in a container. A suction port, a discharge port, inner and outer electric connection parts, and-mounting legs of the container are provided on the same side of a body of the container. A bearing part for supporting an end of a driving shaft for driving the compression mechanism is formed on an end wall integral to -the body of the container, where the end of the driving shaft to be supported by the bearing part is located in the direction opposite to the compression mechanism and the driving shaft is connected to the built-in electric motor. In addition, a pumping mechanism is provided in a pumping chamber opened to an external surface of the end wall and is connected to the end of the driving shaft in the direction opposite to the compression mechanism. The opening of the pumping chamber is closed by a closing member.

Abstract: An air conditioning system includes an engine driven compressor, and an independent electric motor driven compressor in a common housing. A controller adjusts the independent operation of the engine driven compressor and electric motor driven compressor in response to cooling demand input, and operational parameters of the engine and the battery, as well as optionally the electric motor driven compressor output and engine driven compressor output. A method of independently operating an engine driven compressor and electric motor driven compressor is also provided. The air-conditioning system, controller, and method are particularly useful in hybrid vehicles that use smaller displacement internal combustion engines and electric motor drive means.

Abstract: A natural air conditioning system for a car is characterized in a heat energy accumulator, a car battery, a cooler, and a solar collector panel connected to compressor, fan and condenser assembly, expansion valve, and fan and evaporator assembly that are included in a typical car air conditioning system. When the car air conditioning system is in operation, a part of cold energy produced in the system is stored in the heat energy accumulator and the cooler. And, when the car air conditioning system is in an off state, power provided by the solar collector panel or the car battery drives the fan associated with the evaporator and cold energy previously stored in the heat storage accumulator is released to keep an indoor space of the car at a comfortable temperature. Cold energy stored in the cooler also enables the cooler to serve as a spare car refrigerator.

Abstract: A selectively driven compressor for stopping the power generating operation of a motor when an internal combustion engine is operating to make it unnecessary to provide the motor that can withstand high voltage. The system reduces the load on the internal combustion engine. The system includes a pulley driven by a main drive source, an electric motor, which includes an armature and a field system, driven by a power source. The compressor is driven selectively by the pulley or the electric motor. The armature and the field system of the electric motor are independently supported. The pulley is mechanically connected to either of the armature and the field system, and the compressor is mechanically connected to the other.

Abstract: An air-conditioner for use in an automotive vehicle, an engine of which is stopped every time the vehicle stops at an intersection, includes a usual refrigeration cycle having a main compressor driven by the engine and a sub-circuit having a sub-compressor driven by an electric motor. The sub-compressor is connected in parallel to the main compressor, and both compressors are alternately driven. Refrigerant mixed with lubricant circulating in the main refrigeration cycle is prevented from entering into the sub-circuit while the sub-compressor is not in operation by means of a piping structure of the sub-circuit. When the refrigerant enters into the sub-circuit, it is efficiently returned to the main refrigeration cycle by intermittently operating the sub-compressor while the main compressor is operating.

Abstract: A rack system for mounting electronic devices such as computers or telecommunication devices is disclosed. The rack includes an integrated liquid heat exchange cooling system for dissipating the heat generated by the electronic devices. The rack also includes integrated alternating current and direct current power supplies for supplying power to the electronic devices. The entire system is of modular construction, providing both scalability and redundancy.

Abstract: An air conditioning unit is provided for a parked truck/boat to cool the sleeping cabin. The cabin air conditioner having a cooling unit comprising a cooling chamber with at least one insulated wall having on opposite sides there of a heat sink and a cooling block having there between thermoelectric chip(s) or a high efficient D.C. compressor or cold storage phase change material. The air conditioning unit also comprises an air intake conduit, a cool air conduit, an exhaust conduit and means of supplying power to the cooling unit. A method for cooling the. sleeping cabin through the use of the air conditioning unit disclosed in the invention is also provided.

Abstract: A solar powered vapor compression refrigeration system is made practicable with thermal storage and novel control techniques. In one embodiment, the refrigeration system includes a photovoltaic panel, a variable speed compressor, an insulated enclosure, and a thermal reservoir. The photovoltaic (PV) panel converts sunlight into DC (direct current) electrical power. The DC electrical power drives a compressor that circulates refrigerant through a vapor compression refrigeration loop to extract heat from the insulated enclosure. The thermal reservoir is situated inside the insulated enclosure and includes a phase change material. As heat is extracted from the insulated enclosure, the phase change material is frozen, and thereafter is able to act as a heat sink to maintain the temperature of the insulated enclosure in the absence of sunlight.

Abstract: The compressor in a refrigeration system is controlled solely by a variable speed drive which controls the motor of the compressor by virtue of the varying of the frequency of the electricity provided to the motor. To minimize the initial cost and to minimize operating costs, the variable speed drive is cooled by refrigerant from the refrigeration system which permits the use of a smaller drive, and the variable speed drive is operated at, or approaching, a unity power factor.

Abstract: An all electric transport refrigeration system that receives its compressor drive motor power and all other electrical power from a single on-board engine driven generator that is of the axial air gap design type. The incorporation of the axial air gap type generator in the transport refrigeration system results in a system that meets space limitations while at the same time achieves the desired level of power output. This is due to the inherently slim profile of the axial air gap type generator which also promotes greater accessibility and ease of service to generator elements.

Abstract: A miniature thermoelectric cooling device for storing small amounts of thermally unstable substances, like drug vials with insulin for diabetic patients or protein based drugs for thrombolytic therapy, is disclosed. A solar energy collector coupled with a rechargeable battery is provided as the energy source. The miniature cooler is small enough to be belt-carried at all time by a person, whose life or health depends on the drugs. When switched to a heating mode, the thermoelectric device can temporarily elevate the temperature of the drug to a body temperature thus providing comfortable conditions for the injection. A combined solar-and-battery power supply allows keeping an article in the cooler at low temperatures around o'clock at all times during substantially long travels in hot or tropical conditions where even short term exposure to surrounding temperatures can destroy the potency of the drug.

Abstract: An electric air conditioner sustain system is disclosed. The electric air conditioner sustain system includes a compressor, an engine and an electric motor. The engine and the electric motor selectively rotate the compressor. When the engine is rotating the compressor and the engine stops, the electric motor is synchronously activated to maintain continuous rotation of the compressor.

Abstract: A two-phase versatile evaporative cooling heat exchange apparatus 2 for use to produce cool air for homes, factories or for use in vehicles both stationary and moving. The vessel 4 contains the components needed so ambient air 6 is drawn or forced into the evaporative pad 32 to begin the cooling process. The evaporative pad 32 is wetted by thermal liquid 26 being distributed by pump 20 for the first phase cooling 8. The evaporation process uses a portion of the thermal liquid 26 with the remaining, now cooled, excess thermal liquid 36 being returned to the base of vessel 8. The cooled thermal liquid 26 is pumped through the heat exchanger 40 for the second phase cooling 10. The cooled air 12 is delivered into the occupant space 18.

Abstract: The present invention balances power consumption reduction and a cooling in a vehicle air-conditioning system having a compressor selectively driven by a vehicle engine or a motor while the compressor is driven by the motor. At least one of a capacity of a blower and a capacity of a compressor arranged in a refrigeration cycle R while the compressor being driven by a motor is reduced in comparison to the capacity of the blower and the capacity of the compressor while the compressor being driven by a vehicle engine. Furthermore, while a cooling heat load of an evaporator is greater than a predetermined value, the capacity of the compressor is first reduced prior to reducing the capacity of the blower.

Abstract: A chilled beverage display container has an outer casing that includes a base, a top rim member, a cover hinged to the top rim member so that the cover can be pivoted between a closed position and an open position, and a circular cylindrical peripheral wall member of a transparent material, the peripheral wall member being sealed to the base and to the top rim member so as to prevent substantially any flow of a gas into or out of the outer casing. A tub of a transparent material having an upper rim portion, a peripheral wall, and a bottom wall, is supported within the outer casing solely by attachment of the upper rim portion of the tub to the top rim member of the casing. The peripheral wall of the tub is spaced apart from the peripheral wall of the outer casing and the bottom wall of the tub is spaced apart from the base of the outer casing so as to form a dead air space between the tub and the outer casing.

Abstract: An air conditioning unit is provided for a parked truck/boat to cool the sleeping cabin. The cabin air conditioner having a cooling unit comprising a cooling chamber with at least one insulated wall having on opposite sides there of a heat sink and a cooling block having there between thermoelectric chip(s) or a high efficient D.C. compressor or cold storage phase change material. The air conditioning unit also comprises an air intake conduit, a cool air conduit, an exhaust conduit and means of supplying power to the cooling unit. A method for cooling the. sleeping cabin through the use of the air conditioning unit disclosed in the invention is also provided.

Abstract: An air conditioning system for use in a motor vehicle powered by an internal combustion engine is described. The system comprises an electric motor powered by a battery; a compressor arranged to be powered by at least one of the internal combustion engine and the electric motor; and a control unit that controls the driving of the compressor. The control unit is configured to execute driving the compressor by only the electric motor when the combustion engine is under an idling stop; restarting the combustion engine upon expiration of a first given time from the time when the idling stop has occurred, so that thereafter the compressor is driven by both the combustion engine and the electric motor; and stopping the driving of the compressor by the electric motor upon expiration of a second given time from the restarting of the combustion engine, so that thereafter the compressor is driven by only the combustion engine.

Abstract: A solar powered vapor compression refrigeration system is made practicable with thermal storage and novel control techniques. In one embodiment, the refrigeration system includes a photovoltaic panel, a variable speed compressor, an insulated enclosure, and a thermal reservoir. The photovoltaic (PV) panel converts sunlight into DC (direct current) electrical power. The DC electrical power drives a compressor that circulates refrigerant through a vapor compression refrigeration loop to extract heat from the insulated enclosure. The thermal reservoir is situated inside the insulated enclosure and includes a phase change material. As heat is extracted from the insulated enclosure, the phase change material is frozen, and thereafter is able to act as a heat sink to maintain the temperature of the insulated enclosure in the absence of sunlight. The conversion of solar power into stored thermal energy is optimized by a compressor control method that effectively maximizes the compressor's usage of available energy.

Abstract: A solar powered vapor compression refrigeration system is made practicable with thermal storage and novel control techniques. In one embodiment, the refrigeration system includes a photovoltaic panel, a variable speed compressor, an insulated enclosure, and a thermal reservoir. The photovoltaic (PV) panel converts sunlight into DC (direct current) electrical power. The DC electrical power drives a compressor that circulates refrigerant through a vapor compression refrigeration loop to extract heat from the insulated enclosure. The thermal reservoir is situated inside the insulated enclosure and includes a phase change material. As heat is extracted from the insulated enclosure, the phase change material is frozen, and thereafter is able to act as a heat sink to maintain the temperature of the insulated enclosure in the absence of sunlight. The conversion of solar power into stored thermal energy is optimized by a compressor control method that effectively maximizes the compressor's usage of available energy.

Abstract: A multi-stage driven type compressor pump driving system for air conditioning and refrigeration applications, a multi-stage driving structure other than a variable frequency stage-less driving structure to lower costs and improve electromagnetic compatibility (EMC) without loss of function relative to the variable frequency system.

Abstract: A locomotive cab air conditioning method involves providing a multi-speed motor operable in at least a first speed state and a second speed state, the motor connected for driving a refrigerant compressor from a companion alternator output of the locomotive. An operating speed of a locomotive engine is monitored, and operation of the motor in one of the speed states is established based at least in part upon the monitored locomotive engine speed.

Abstract: Environmental control and electric power are provided for a vehicle (12) carrying at least one gas turbine engine (14, 16) including a turbine (40,46) and a compressor (42,48); a stored energy device (28); a first turbine (64) powered by the stored energy device (28); an expansion turbine (60) for an air cooling cycle; and an electric generator (34) rotatably driven by the first turbine (64) and the expansion turbine (60). The electric generator (34) has a minimum operating speed required to generate acceptable electric power for the vehicle (12).