A motor-driven compressor includes a compression unit, an electric motor, a drive circuit, a first housing, a second housing, and a soundproofing material. The second housing covers at least part of an outer surface of the first housing. The soundproofing material is arranged between the outer surface of the first housing and an area that includes an inner surface and a wall surface of the second housing. The soundproofing material has sound insulating properties. The soundproofing material includes a sound absorbing layer and a sound insulating layer. A first region and a second region are formed between the outer surface of the first housing and the area that includes the inner surface and the wall surface of the second housing. An air layer is formed in the second region.

A motor-driven compressor includes a compression unit, an electric motor, a motor controller, a housing, and a connector. The motor controller includes a circuit board. The housing includes an inverter accommodation chamber, and the inverter accommodation chamber accommodates the motor controller. The connector is accommodated in the inverter accommodation chamber and electrically connects the circuit board and a member located outside the inverter accommodation chamber. The connector includes one or more busbars and a case. The one or more busbars are electrically connected to the circuit board. The case is formed from a resin and accommodates the one or more busbars. The circuit board and the connector are fastened to the housing. The one or more busbars are allowed to move in the case when the circuit board vibrates.

An air conditioning kit for vehicles, comprising: an auxiliary compressor, which can be powered with an energy source that is independent of the engine and which optionally coincides with the original battery of the vehicle, the auxiliary compressor being interposed between an intake branch and a delivery branch, a first connector, for the connection of the intake branch to the intake conduit, defined by the circuit, of the primary compressor, a second connector, for the connection of the delivery branch to the delivery conduit, defined by the circuit, of the primary compressor, an apparatus for intercepting at least a part of the lubricant that is usually dispersed in the heat carrier fluid, in order to prevent the complete emptying of lubricant in the primary compressor and/or in the auxiliary compressor.

A current estimating device that estimates a capacitor current of a high-voltage circuit for driving a motor, wherein the current estimating device calculates a voltage utilization rate using the input voltage of an inverter included in the high-voltage circuit and the speed of the motor, calculates a first constant by applying the voltage utilization rate to a predetermined first arithmetic expression, and calculates the capacitor current of an electrical condenser included in the high-voltage circuit by multiplying the first constant by a motor current effective value.

A vehicle thermal management system including a refrigerant circuit, a coolant circuit, a chiller, and a controller is provided. The refrigerant circuit may include an electric air conditioning (eAC) compressor and a pressure sensor. The coolant circuit may include a high-voltage battery. The chiller selectively thermally links the circuits. The controller may be programmed to, responsive to receipt of a sensor signal indicating refrigerant pressure exiting the eAC compressor is greater than a high threshold, output a pressure sensor fault error indicating the pressure sensor is faulty. The system may further include a timer to monitor operational timing of the eAC compressor. The controller may be further programmed to direct the system to operate without monitoring the eAC compressor responsive to the timer indicating the eAC compressor has been off for a time-period less than a time threshold reflective of the eAC compressor not being in an at rest state.

A vehicle air conditioning system includes an in-vehicle air conditioner that includes a refrigerant circulation circuit including a compressor and an evaporator; a weather information acquiring section configured to acquire weather information at a current location of a vehicle; an evaporator drying determining section configured to estimate a water retention amount of the evaporator based on the weather information acquired by the weather information acquiring section and an operation state of the in-vehicle air conditioner, and to determine whether the evaporator is in a dry state; and a compressor stop permitting section configured to output a permission signal for permitting stop of the compressor on a condition that the evaporator drying determining section determines that the evaporator is in the dry state.

Methods, systems, and apparatus for a heating, ventilation and air conditioning (HVAC) system that limits the speed of the compressor to allow for the adoption or use of an internal heat exchanger. The HVAC system includes a compressor configured to drive refrigerant flow and an inverter configured to control a speed of the compressor. The HVAC system includes a first sensor configured to measure a temperature of the inverter and an electronic control unit. The electronic control unit is configured to obtain, from the first sensor, the temperature of the inverter. The electronic control unit is configured to determine a range of speeds for the compressor based on the obtained temperature of the inverter. The electronic control unit is configured to operate the compressor within the determined range of speeds.

A reversible refrigeration cycle system is configured to provide heating and cooling to condition passenger air for a vehicle such as, for example, a bus. The reversible refrigeration cycle system includes a storage tank for storing fluid, a compressor, a plurality of coils, and valves for selectively conducting the fluid to the plurality of coils.

Provided is a control device that performs protection control of a compressor without malfunction. The control device activates protection control on a compressor included in a refrigerant circuit based on a pressure value detected by a pressure sensor that is installed at a low-pressure side of the refrigerant circuit and a change over time of the pressure value.

An optimized power converter for use in a transport electrical system that provides power to a transport climate control system is provided. The optimized power converter includes an optimized DC/DC converter and an inverter/active rectifier. The optimized DC/DC converter is only boosts a voltage level when current is directed from a rechargeable energy storage to the inverter/active rectifier and only bucks a voltage level when current is directed from the inverter/active rectifier to the rechargeable energy storage. In a charging mode, the inverter/active rectifier converts three phase AC power into DC power, and the optimized power converter bucks the DC power to a voltage level that is acceptable for charging the rechargeable energy storage. In a discharge mode, the optimized DC/DC converter boosts voltage from the rechargeable energy storage, and the inverter/active rectifier converts boosted DC power into three phase AC power for powering a transport climate control system load.