An air conditioning system for use in a vehicle includes at least one compressor, a condenser disposed downstream of the at least one compressor and a plurality of evaporators disposed downstream of the condenser with first and second evaporators fluidly coupled to each other in parallel. The at least one compressor, the condenser, and the plurality of evaporators are fluidly connected by refrigerant lines to form a refrigerant circuit. The air conditioning system also includes a plurality of shut-off valves, with one shut-off valve installed at a refrigerant inlet and another shut-off valve installed at a refrigerant outlet of the first evaporator. The shut-off valves are controlled to prevent undesired collection of refrigerant in the first evaporator.

An externally-controlled variable displacement compressor (EVDC) cold-start method is described including, during an EVDC cold-start procedure, iteratively alternating an amount of a control current supplied to an electronic control valve (ECV) associated with the EVDC between no control current and a full control current. Systems for implementing the described method are provided.

A vehicle power adjusting device, applied in auxiliary dynamic loads on a vehicle comprises a control chip, a temperature sensor, a speed detecting wire, and a relay; when the power for starting the vehicle is insufficient, auxiliary dynamic load is closed to release power, such that the power for starting is sufficient, so as to decrease the accelerating time, reduce toxic emission and enable the auxiliary dynamic load by using the surplus power during the cruising vehicle and the wasted power during the decelerating vehicle, thereby achieving the purpose of reducing the energy consumption, having powerful starting, completing combustion, reducing exhaust gas, and also saving fuel, reducing carbon emission and protecting environment effects.

A vehicle air conditioner has a compressor, a radiator, a pressure reducer, a cooling heat exchanger, a temperature detector, and a prohibition request output part. The compressor draws and discharges a refrigerant. The radiator dissipates heat of the refrigerant. The pressure reducer decompresses and expands the refrigerant. The cooling heat exchanger cools an air blown into a vehicle compartment. The temperature detector detects a temperature of the cooling heat exchanger. The prohibition request output part outputs a request, which prohibits the idle stop control, to an idle stop controller when the engine is operated. The request prohibits the idle stop control until the temperature of the cooling heat exchanger falls to a temperature being enough cool to cool the air and a required cooling time elapses. The required cooling time is estimated to be required to make a passenger feel cool by the air.

A vehicle heating, ventilating, and air conditioning (HVAC) system can reduce a load applied to a vehicle powertrain during certain conditions. The system can include a compressor operable based on a first target evaporator outlet (TEO) temperature map. Systems and methods can determine if an HVAC system is activated, and whether an engine water temperature meets a forced HVAC recirculation intake threshold. Responsive to determining that the engine water temperature meets the forced HVAC recirculation intake threshold, it can be determined if the engine water temperature meets a first threshold. Responsive to the recirculation mode air source being selected, determining if at least one measured vehicle condition meets predetermined criteria. Responsive to determining that the engine water temperature meets the first threshold, the compressor can be operated based on a second TEO temperature map, the second TEO temperature map including higher TEO temperatures than the first TEO temperature map.

A method of operating a cooling system of a vehicle includes measuring a refrigerant pressure and a refrigerant temperature of a flow of refrigerant in a refrigerant circuit of the cooling system, estimating a relative humidity of a supply airflow across an evaporator of the refrigerant circuit utilizing the measured refrigerant pressure and the measured refrigerant temperature, and changing operation of one or more components of the refrigerant circuit as a result of the estimated relative humidity.

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.

A control system, which may be a Proportional Integral Derivative (PID) control system, controls a component by adjusting the control input and the execution of the control output whenever a change in a state of a component exceeds a certain value. A method is also described.

A mobile hybrid electric temperature-controlled system connected to a vehicle, such as a vehicle-transported refrigeration system, includes a power management system and an energy storage module. The power management system and energy storage module can manage power delivered to the temperature-controlled system components by monitoring temperatures and voltages (and possibly other factors) and by delivering power as a function of the things monitored. In a typical implementation the power management system and an energy storage module can supply power to a vehicle-transported refrigeration system when the vehicle is stopped and/or power from the vehicle electrical system is electrically isolated or otherwise unavailable.

A method for controlling a thermal conditioning system is disclosed. The thermal conditioning system includes a refrigerant unit configured to circulate a refrigerant. The refrigerant circuit includes a main loop and a first bypass branch. The main loop includes a compression device, a first heat exchanger configured to exchange heat with a first heat transfer fluid, a first expansion device, and a first evaporator configured to exchange heat with an element of a powertrain of a motor vehicle via a second heat transfer fluid. The method includes determining a pressure of the refrigerant at the outlet of the first evaporator and controlling, depending on the determined pressure, at least one parameter so that the pressure of the refrigerant at the outlet of the first evaporator is below a predetermined pressure threshold.