Methods and systems are provided for carrying out on-board diagnostics of a plurality of components of an exhaust heat exchange system. In one example, degradation of one or more of a heat exchanger and a coolant system fluidically coupled to the heat exchanger may be detected based on a first temperature estimated upstream of the heat exchanger, a second temperature sensor estimated downstream of the heat exchanger, a coolant temperature, and a pressure estimated upstream of the heat exchanger. Also, degradation of a diverter valve of the heat exchange system may be detected based on inputs of a position sensor coupled to the diverter valve.

Systems and methods for heating and cooling a vehicle using a heat pump are disclosed herein. In one embodiment, a system for heating and cooling the vehicle includes a heat pump having: a compressor located in an engine compartment of the vehicle, and an evaporator located in a sleeper or a cab of the vehicle. The system also includes a controller for selecting a cooling mode or a heating mode for the heat pump. In one embodiment, the system includes a clutch for engaging the compressor with a transmission of the vehicle.

The control apparatus includes a heater configured to generate heat to heat the internal combustion engine, a controller configured to control a heat exchange system in such a way as to transfer EV exhaust heat to the internal combustion engine, and an controller configured to let electrical power be supplied from a battery to the heater before the internal combustion engine is started if it is predicted that a specific warmed-up condition of the internal combustion engine will not be established before the start of the internal combustion engine and not to let electrical power be supplied from a battery to the heating if it is predicted that a specific warmed-up condition of the internal combustion engine will be established before the start of the internal combustion engine.

A control apparatus in a cooling system has an opening schedule of a degree of opening of each of a plurality of outflow ports in a control valve including at least a heater cut mode, a heater passing water mode, a fully closed mode, and a switching mode in which the opening and closing of an air conditioning outflow port is switched in a state in which at least one outflow port of a radiator outflow port and a bypass outflow port is opened and switches the heater cut mode and the heater passing water mode via the switching mode.

Methods and system for providing heat to a vehicle are presented, whereby a refrigerant loop is operated to heat a cabin of the vehicle via heat generated by a compressor and heat generated by a resistive heating element. The heat generated by the compressor and the heat generated by the resistive heating element are transferred to a refrigerant before it is transferred to the cabin. In one example, in a first mode, an evaporator bypass valve on an evaporator bypass conduit of the A/C system is opened to route the refrigerant around an evaporator of the A/C system to increase a temperature of the refrigerant in the refrigerant loop; and in a second mode, the evaporator bypass valve is closed to route the refrigerant through the evaporator, where heat is released to a flow of air across the evaporator that is directed to the vehicle cabin.

Systems and methods for providing heat to a passenger cabin of a hybrid vehicle that includes an internal combustion engine are presented. The systems and methods may selectively operate the internal combustion engine with one or more engine cylinders deactivated and may selectively flow coolant to one or more cylinders to improve passenger cabin heating in response to a request for passenger cabin heat.

A air conditioning control device is configured to estimate whether or not the temperature of refrigerant on a high-pressure side in a heat pump device is equal to or lower than a predetermined low temperature and to switch a flow path switching device to an air-heating start-up mode when it is estimated that the temperature of refrigerant on the high-pressure side in the heat pump device is equal to or lower than the predetermined low temperature and switch the flow path switching device to a normal air-heating mode when it is estimated that the temperature of refrigerant on the high-pressure side in the heat pump device is higher than the predetermined low temperature.

At least one inverter is heated by causing an inverter heat generation control unit to pass a predetermined current through the inverter for a predetermined time, and heating of the at least one inverter causes a high-voltage battery (storage battery) to warm up via a cooling circuit. Accordingly, control for warmup of the high-voltage battery (storage battery) is simply performed by passing the predetermined current through the inverter for a predetermined time. This inverter heat generation control can also be applied to a vehicle not including a step-up converter.

A cooling device includes: an air blast passage; a heater core that is disposed in the air blast passage; an air blast volume adjusting member that is opened and closed to adjust an air blast volume which flows in the heater core; a flow rate adjuster that adjusts a flow rate of the coolant which is introduced into the heater core; and a controller. The controller sets the flow rate of the coolant which is adjusted by the flow rate adjuster to be less than a lower limit value of an adjustable range of the flow rate of the coolant which is adjusted by the flow rate adjuster in a vehicle compartment air-conditioning state in which the air blast volume adjusting member allows an air blast to flow to the heater core when the air blast volume adjusting member fully closes the heater core side of the air blast passage.

A number of variations may include a vehicle system which includes an engine. The vehicle system may also include a phase change material which may be disposed in a phase change material device. The phase change material may be released into a vehicle cooling system upon user command. The PCM device may be constructed and arranged to increase a temperature of a vehicle cabin without the engine being turned on when the phase change material is released.