A cooling fan control system is provided. The system includes a sensor unit that includes a temperature sensor that generates a first output value corresponding to a coolant temperature and an air-conditioner pressure transducer that generates a second output value corresponding to an air-conditioner pressure and a cooling control portion. The cooling control portion generates a control condition based on the first output value and the second output value and adjusts a rotation speed of a cooling motor based on the control condition. The control condition includes a target control condition formed as a region including a cross point of the first output value and the second output value. The cooling control portion adjusts the rotation speed of the cooling motor to cause the first output value and the second output value to correspond to the target control condition.

Methods and systems are provided for adjusting operation of an automotive air conditioning system including a pressure sensor positioned within a compression chamber. In one example, a method may include adjusting operation of the air conditioning system based on one or more parameters of a compressor operation including a compressor inlet pressure, a compressor outlet pressure, and a compressor speed, that are determined based on output from the pressure sensor positioned within the compression chamber.

A parking cooler which is capable of battery powered operation during engine off operation. The parking cooler or air conditioning system may vary in cooling capacities to maximize cooling or maximize battery life. The parking cooler includes one or more additional cooling mechanicals within either of two housings to accommodate variation of cooling capacity.

An apparatus for a vehicle includes a cooling fan installed in an engine compartment of the vehicle. A fan motor is connected with the cooling fan to drive the cooling fan. A state detector is configured to detect state data, and a controller is configured to control the cooling fan based on the state data when an intake temperature is within a predetermined range, to determine whether the state data satisfies a decision reference condition, and to lock the fan motor according to a change rate of air conditioner refrigerant pressure during a measurement time when the state data satisfies the decision reference condition.

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.

Disclosed are climate systems for vehicles and methods for controlling the climate systems. In some implementations, a climate system includes: (1) a temperature sensor configured to measure a temperature within the compartment of the vehicle; (2) a user interface configured to receive a desired temperature from a user; (3) a first compressor powered by an engine of the vehicle to compress a refrigerant; (4) a second compressor driven by an electric motor to compress the refrigerant; and (5) a controller electrically coupled to the first compressor and the second compressor. The controller configured to: (1) calculate a thermal load of the compartment based on a difference between a desired temperature and a measured temperature; and, (2) based on the calculated load, selectively activate: (i) the engine, (ii) the first compressor, and/or (iii) the second compressor.

The various implementations described herein include methods, devices, and systems for starting-up a vehicle air-conditioning system. In one aspect, a method is performed at a vehicle air-conditioning system including a blower fan, a condenser fan, and a compressor electrically coupled to a battery system. The method includes: (1) starting the blower fan; (2) after starting the blower fan, measuring a first current drawn from the battery system, the first current indicative of current drawn by the blower fan; (3) in accordance with a determination that the first current meets predefined criteria, starting the condenser fan; (4) after starting the condenser fan, measuring a second current drawn from the battery system, where the difference between the second current and the first current is indicative of current drawn by the condenser fan; and (5) in accordance with a determination that the second current meets predefined second criteria, starting the compressor.

Methods and systems for controlling condenser/radiator airflow in a TRS are provided. In particular, methods and systems are provided to control a fan speed of condenser fan(s) of a TRS based on a condenser/radiator performance parameter, a traveling speed of a refrigerated transport unit, and/or a compressor discharge pressure a compressor of the TRS. The fan speed of the condenser fan(s) can be increased when necessary to limit a negative impact on TRS performance caused by a static pressure at an outlet of the condenser fan(s) or under high ambient temperature conditions. The fan speed of the condenser fan(s) can be reduced to reduce noise levels generated by the TRS when the static pressure at the outlet of the condenser fan(s) does not negatively impact the performance of the TRS or when the refrigerated transport unit is not located in an area with a high ambient temperature.

A system is provided that includes mode, engine, and battery modules. The mode module is configured to determine whether to operate in an engine mode or a battery mode based on parameters. The engine module, while operating in the engine mode, runs a compressor at a first speed based on a temperature within a temperature controlled container of a vehicle and permits passage of refrigerant through eutectic plates independent of the temperature. A battery, while in the engine mode, is charged based on power received from an electrical source. The battery module, while operating in the battery mode and based on the temperature, runs the compressor at a second speed and prevents passage of the refrigerant through the eutectic plates. While in the battery mode, the battery is not being charged based on power from a shore power source and the electrical source from which power is received during the engine mode.

A refrigeration system for a vehicle includes a compressor in fluid communication with a condenser and an evaporator. The compressor includes a variable speed motor and employs capacity modulation using refrigerant injection. The condenser and the evaporator include variable speed fans. The refrigeration system includes a battery to supply power to the refrigeration system. The battery is charged by one or more sources of power including the vehicle. The refrigeration system includes a control module configured to monitor one or more characteristics of the battery and to control one or more operating parameters of one or more of the compressor, the condenser, and the evaporator based on the one or more characteristics of the battery.