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 computer includes a processor and a memory, the memory storing instructions executable by the processor to collect (a) ambient weather data, (b) vehicle speed data including at least one of a vehicle speed or an engine speed, and (c) operation data of a climate control subsystem of a vehicle, input the collected data to a regression program trained to output a predicted pressure of refrigerant of the climate control subsystem, the regression program trained with previously determined ambient weather data, data of a previous vehicle speed or a previous engine speed, and previous operation data of the climate control subsystem, determine an actual pressure of the refrigerant in the climate control subsystem, and actuate a component upon determining that a difference between the predicted pressure and the actual pressure falls below threshold.

It is an object to improve the reliability of a temperature adjusting device which cools an in-vehicle device such as a battery by using a refrigerant. A device temperature adjusting device 61 that is an in-vehicle device temperature adjusting device adjusts the temperature of a battery 55 mounted on a vehicle and includes a refrigerant circuit R having a compressor 2 which compresses a refrigerant, an outdoor heat exchanger 7 for letting the refrigerant radiate heat, and a refrigerant-heat medium heat exchanger 64 for cooling the battery 55 by letting the refrigerant absorb heat, and a control device 11. The control device 11 stops the compressor 2 on the basis of the fact that the refrigerant circuit R is blocked.

An expansion valve for an air conditioning system of a motor vehicle may include a housing, a sensor, a stepping motor or a BLDC motor, a valve seat, and a valve body. The stepping motor or the BLDC motor may include a rotor and a stator surrounding the rotor. The rotor may include a permanent magnet body connected non-rotatably therewith. A separating can may be provided that surrounds the rotor and separates a wet region on a rotor side from a dry region on a stator side. The sensor may be connected with the separating can via an adhesive layer formed as a heat-conductive layer.

This disclosure relates to a vehicle configured to detect a low refrigerant charge and a corresponding method. In some aspects, the techniques described herein relate to a vehicle, including: a thermal conditioning system including a compressor and a suction pressure sensor upstream of the compressor; and a controller in communication with the compressor and the suction pressure sensor, wherein the controller is configured to perform a technique to monitor for a low charge condition, and the controller is configured to inhibit a low pressure cutoff when the controller is performing technique.

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.

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.

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.

Embodiments are provided for a system configured to provide pre-trip sequence and diagnostics for refrigerant leak sensor. The system includes a sensor, a fan, and a controller. The controller is further configured to validate an operation of the sensor, operate the fan based at least in part on validating the operation of the sensor, and responsive to operating the fan, determine if a leak is present using the sensor. The controller is also configured to perform a refrigeration test, determine if a leak is present using the sensor, and provide an alarm based at least in part on determining the leak is present. Embodiments are also provided for a method for performing a pre-trip sequence and diagnostics for a leak sensor.

A control system for a heating system of an electric or hybrid vehicle with a coolant cooled high voltage store. The control system includes an air conditioning evaporator of a refrigeration circuit of the heating system through which refrigerant circulates to cool the passenger compartment when a cooling requirement for a passenger compartment of the vehicle and for which an air conditioning cooling mode is set. The system further includes a chiller to cool the high voltage store when a cooling requirement for the high voltage store of the vehicle and for which a high voltage store (HVS) cooling mode is set. The control system selects the regulating variable for the compressor from a plurality of different regulating variables based on whether the air conditioning cooling mode is set, whether the HVS cooling mode is set, and/or whether both the air conditioning cooling and HVS cooling modes are set.