A transport refrigeration unit and a method for controlling the transport refrigeration unit, wherein the transport refrigeration unit has a controller device for operating a compressor of the transport refrigeration unit with a continuously-variable speed, which allows the compressor to run continuously but with a smooth gradient range of speed variations. The controller device allows the transport refrigeration unit to have a start-stop operation stage, continuous run operation stage, and/or a cycle-sentry operation stage.

An air conditioner includes a heat medium circuit, a refrigerant cycle device, a discharge capacity controlling section, a heat generation amount controlling section, a target temperature determining section, and an upper limit determining section. The heat medium circuit includes a heating heat exchanger and an electric heater. The refrigerant cycle device exchanges heat between a heat medium in the heat medium circuit and a refrigerant discharged from an electric compressor. During a heater priority mode, the rotational speed of the compressor is increased to reach an upper limit and a heating amount of the heater is increased as a temperature difference increases. During a compressor priority mode, the heating amount of the heater is decreased and the rotational speed is increased to compensate for a decreasing amount.

A method for controlling pressure in a vehicle thermal management system, includes: determining, by a controller, whether only the battery pack is cooled when cooling of a passenger compartment is desired; stopping, by the controller, the compressor when it is determined that only the battery pack is cooled; determining, by the controller, whether a noise generation condition is satisfied after stopping the compressor.

This disclosure relates to an electrified vehicle having a control strategy for managing battery and cabin cooling. A corresponding method is also disclosed. An example electrified vehicle includes a cabin thermal management system configured to thermally condition a cabin of the electrified vehicle. The cabin thermal management system includes a compressor. The vehicle further includes a battery thermal management system configured to thermally condition a battery of the electrified vehicle, and a controller configured issue an instruction to reduce the speed of the compressor based, at least in part, on a speed of the electrified vehicle and a temperature of the battery.

During pre-air conditioning in a vehicle cabin, when consumed electric power exceeds use permission electric power while an auxiliary heating device is operating, an operation of the auxiliary heating device is stopped. In contrast, when the consumed electric power exceeds the use permission electric power while the auxiliary heating device is not operating, a rotation speed of an electric compressor of an air conditioner is restricted. Therefore, the temperature environment in the vehicle cabin is improved by continuing the pre-air conditioning of the air conditioner while reducing the consumed electric power by stopping the operation of the auxiliary heating device.

A system and method for protecting against low refrigerant charge of a refrigerant subsystem in a vehicle includes a controller configured to control a component of the vehicle in response to detecting a low refrigerant charge based on an ambient temperature of the refrigerant subsystem, a suction pressure of refrigerant entering a compressor of the refrigerant subsystem, and a speed of the compressor.

A transport refrigeration system, a control method therefor and an electric transport vehicle are provided by the present disclosure. The control method for the transport refrigeration system includes: if a ratio of a current battery charge amount to a minimum battery charge amount is not less than a first preset value, controlling power consuming units in the transport refrigeration system to operate in a power-unrestricted state; and if the ratio of the current battery charge amount to the minimum battery charge amount is less than the first preset value, controlling the power consuming units in the transport refrigeration system to operate in a power-restricted state; wherein the power-restricted state is associated with the ratio of the current battery charge amount to the minimum battery charge amount.

A cooling system control method for an autonomous driving controller may include detecting the temperature of the autonomous driving controller by the controller when a vehicle is driving; determining whether a current temperature of the autonomous driving controller is lower than a target temperature by the controller; and terminating the controlling of the cooling system if the condition is satisfied in determining whether the current temperature of the autonomous driving controller is lower than the target temperature.

A control module for a refrigeration system includes a startup mode control module that receives an off time of a compressor and an ambient temperature, determines whether the off time and the ambient temperature indicate that the compressor is in a flooded condition, and selects, based on the determination, between a normal startup mode and a flooded startup mode. A compressor control module transitions from the flooded startup mode to the normal startup mode after a predetermined period associated with operating in the flooded startup mode and operates the compressor at a first speed in the normal startup mode and operates the compressor at a second speed less than the first speed in the flooded startup mode.

A method of mitigating refrigerant leaks within a refrigeration system that includes: detecting a leak of a refrigerant from a refrigeration system; closing a first valve to inhibit a fluid flow of the refrigerant between an evaporator and a condenser fluidly connected to the evaporator; and operating a compressor to direct another fluid flow of the refrigerant from the evaporator to the compressor.