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.

Methods, systems, and apparatus for managing climate control. The control system includes one or more sensors that are configured to measure sunload energy. The control system includes a heating, ventilation and air conditioning (HVAC) unit that is configured to output air with an airflow rate into the cabin of the vehicle. The electronic control unit is configured to obtain the amount of sunload energy and obtain a blower map based on the amount of sunload energy. The electronic control unit is configured to determine the airflow rate based on the obtained blower map and an expected temperature. The electronic control unit is configured to control the airflow rate to adjust an air temperature within the cabin of the vehicle to reach the expected temperature therefore increasing the fuel efficiency.

Methods and systems for controlling a heating, ventilation, and air-conditioning (HVAC) intake. An air-conditioning control device receives the detected ambient air from an ambient air sensor, and the detected air temperature at a front of a condenser. The two temperatures are compared to determine whether to change the HVAC intake. In response to determining the air temperature at the front of the condenser is higher than the ambient air, the HVAC intake is placed into a recirculate position to allow air from the vehicle compartment to enter the HVAC intake.

A refrigeration system and a start control method for a refrigeration system. The refrigeration system includes: a refrigeration loop having an exhaust port of a compressor, a condenser, a throttle element, an evaporator, and a suction port of the compressor connected in sequence by using a flow path; wherein a first valve is disposed between the throttle element and the condenser, and the first valve is at least capable of cutting off a refrigerant flow from the throttle element to the condenser; and a second valve is disposed close to the suction port of the compressor, and the second valve is used to control on/off of a flow path between the evaporator and the compressor. Starting load of the refrigeration system according to the present invention can be effectively reduced, so that the power and size of a drive component for providing power can also be reduced.

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.

Provided is a high-voltage equipment cooling system for electric-powered vehicles, which is capable of cooling high-voltage equipment (an IPU herein) at an optimum air flow rate without impairing the air-conditioning state of a vehicle interior. This high-voltage equipment cooling system is equipped with an IPU cooling ECU with a control unit, which controls the air flow rate of an IPU fan on the basis of information related to the air blowing method for the IPU, information related to the air flow rate of a blower fan, information related to the selection of inside air circulation mode or outside air introduction mode by an HVAC, information related to the selection of one of air blowing modes by the HVAC, and information related to the air flow rate to be supplied to the IPU.

A hybrid power conversion system (60) for an air conditioned transport vehicle (24) including a plurality of refrigeration components (52, 54, 56) for heating and/or cooling a refrigerated volume (40). Also included is a battery (62) storing electrical power to be provided to at least one of the plurality of refrigeration components (52, 54, 56). Further included is at least one supplemental power source (68, 70, 72, 76) providing electrical power to the battery (62) to provide a total available DC power for the refrigeration components (52, 54, 56). Yet further included is a power converter (64) converting the total available DC power to a total AC power, the total AC power provided to at least one of the plurality of refrigeration components (52, 54, 56).

Methods and systems are provided for controlling coolant flow through parallel branches of a coolant circuit including an AC condenser and a charge air cooler. Flow is apportioned responsive to an AC head pressure and a CAC temperature to reduce parasitic losses and improve fuel economy. The flow is apportioned via adjustments to a coolant pump output and a proportioning valve.

Systems and methods to control a prime mover of a transport refrigeration system are disclosed. A controller may be configured to receive input from various information sources including a global satellite positioning system and/or a human machine interface. The controller can be configured to select a prime mover operation mode based on the input received. In some embodiment, the controller can select a noise reduction operation mode when the TRU is located in a noise regulated area, and can select a fuel efficient mode when the TRU is located outside of the noise regulated areas. In some embodiments, the noise reduction operation mode may include increasing a speed of the prime mover in a soft sloped ramp. In some embodiments, the operation modes can include prime mover operation instructions containing parameters of fuel injection of the prime mover. The operation instructions can be sent to an ECU to execute.

An air conditioner cut control system may include a driving condition detection unit detecting operation conditions of a vehicle, an air conditioner controller configured of determining an intake manifold negative pressure stored in a brake booster at a value obtained by subtracting intake manifold pressure from an atmospheric pressure detected by the driving condition detection unit when the air conditioner is operated and an engine control unit (ECU) for integrating the intake manifold negative pressure according to a brake negative pressure prediction logic and determining a virtual brake booster sensor value by modeling change of booster negative pressure according to driving information, and the ECU, and if the virtual brake booster sensor value is below a reference negative pressure of an A/C CUT standard logic, the ECU determines that brake negative pressure is insufficient and activates A/C CUT.