Abstract: An air-conditioning system preventing the vented air temperature of a rear seat evaporator from not being able to be adjusted, wherein an electronic control system judges that the surface of the rear seat evaporator is frosting up when a target blowing rate of the rear seat blower is lower than a predetermined value, a detection temperature of an evaporator vented air temperature sensor is lower than TEa, and a detection temperature of the outside air temperature sensor is lower than TAMa; TEO is raised at this time, so an electric motor of an electric compressor is stopped; refrigerant no longer flows into the rear seat evaporator for this reason and the surface of the rear seat evaporator rises in temperature, so the rear seat evaporator can be defrosted; and even if the surface of the rear seat evaporator frosts, the rear seat evaporator 8 can be defrosted, so the vented air temperature of the rear seat evaporator can be prevented from not being able to be adjusted.

Abstract: During the period of deceleration of a vehicle, an air conditioning control unit modifies a target cooling temperature (TEO) of an evaporator to a temperature lower than that before the deceleration by ? ° C. in order to store cold in the evaporator (step S130). When the vehicle comes to rest, the air conditioning control unit sets an upwardly-modified target temperature TEOK, which is a temperature modified toward more or less higher temperatures from the target cooling temperature TEO, and brings a compressor to rest and keeps the resting state of the compressor until a detected temperature TE of an evaporator discharge temperature sensor exceeds TEOK (step S180). Therefore, it is possible to effectively utilize the cold heat stored in the evaporator 6 during the period of deceleration of the vehicle with a good feeling of passengers being maintained while the vehicle is at rest.

Abstract: In a vehicle air conditioner having a variable displacement compressor, a control unit calculates a target cooling temperature of air to be cooled by an evaporator, and controls a discharge capacity of the compressor such that a detected air temperature of the evaporator approaches the target cooling temperature. When a deceleration running state of the vehicle is detected, the control unit sets a corrected target cooling temperature lower than the target cooling temperature by a predetermined temperature, and controls the discharge capacity of the compressor such that the detected air temperature approaches the corrected target cooling temperature when the detected air temperature is lower than the corrected target cooling temperature, or controls the discharge capacity of the compressor approximately at the maximum capacity regardless of the corrected target cooling temperature when the detected air temperature is not lower than the corrected target cooling temperature.

Abstract: During the period of deceleration of a vehicle, an air conditioning control unit modifies a target cooling temperature (TEO) of an evaporator to a temperature lower than that before the deceleration by ? ° C. in order to store cold in the evaporator (step S130). When the vehicle comes to rest, the air conditioning control unit sets an upwardly-modified target temperature TEOK, which is a temperature modified toward more or less higher temperatures from the target cooling temperature TEO, and brings a compressor to rest and keeps the resting state of the compressor until a detected temperature TE of an evaporator discharge temperature sensor exceeds TEOK (step S180). Therefore, it is possible to effectively utilize the cold heat stored in the evaporator 6 during the period of deceleration of the vehicle with a good feeling of passengers being maintained while the vehicle is at rest.

Abstract: In a vehicle air conditioner having a variable displacement compressor, a control unit calculates a target cooling temperature of air to be cooled by an evaporator, and controls a discharge capacity of the compressor such that a detected air temperature of the evaporator approaches the target cooling temperature. When a deceleration running state of the vehicle is detected, the control unit sets a corrected target cooling temperature lower than the target cooling temperature by a predetermined temperature, and controls the discharge capacity of the compressor such that the detected air temperature approaches the corrected target cooling temperature when the detected air temperature is lower than the corrected target cooling temperature, or controls the discharge capacity of the compressor approximately at the maximum capacity regardless of the corrected target cooling temperature when the detected air temperature is not lower than the corrected target cooling temperature.

Abstract: A vehicle refrigerating cycle device capable of preventing the air-conditioning from becoming inadequate and capable of improving vehicle fuel economy is installed in a vehicle having both, a vehicle engine capable of carrying out stratified combustion and a brake booster. Negative pressure generated in an intake system of the engine is accumulated as brake negative pressure, which drives the brake booster. The refrigerating cycle device has a variable displacement type compressor driven by the vehicle engine and a negative pressure detection means for detecting the brake negative pressure. In the stratified combustion operation and at the time of the brake operation to cause the vehicle to stop, the volume in the compressor is controlled to reduce the load on the compressor by a prescribed amount when the detected brake negative pressure is below a prescribed value. Then, the volume in the compressor is gradually increased.

Abstract: A method of control for preventing warm air from being exhausted during a fuel cut when driving an air-conditioning system by a vehicle engine comprising, when it is judged that the fuel has been cut when the engine is decelerating and the engine speed has fallen to a first judgement value, causing the amount of discharge and torque of the refrigerant compressor to fall once to for example zero or a value close to zero, then causing them to gradually rise in a pattern of torque control of the refrigerant compressor and, when it is judged that the engine speed has fallen to a second judgement value, causing the fuel cut of the engine to end so as to secure the minimum necessary cooling capacity and extend the fuel cut time simultaneously.

Abstract: A vehicle refrigerating cycle device capable of preventing the air-conditioning from becoming inadequate and capable of improving vehicle fuel economy is installed in a vehicle having both, a vehicle engine capable of carrying out stratified combustion and a brake booster. Negative pressure generated in an intake system of the engine is accumulated as brake negative pressure, which drives the brake booster. The refrigerating cycle device has a variable displacement type compressor driven by the vehicle engine and a negative pressure detection means for detecting the brake negative pressure. In the stratified combustion operation and at the time of the brake operation to cause the vehicle to stop, the volume in the compressor is controlled to reduce the load on the compressor by a prescribed amount when the detected brake negative pressure is below a prescribed value. Then, the volume in the compressor is gradually increased.

Abstract: A method of control for preventing warm air from being exhausted during a fuel cut when driving an air-conditioning system by a vehicle engine comprising, when it is judged that the fuel has been cut when the engine is decelerating and the engine speed has fallen to a first judgement value, causing the amount of discharge and torque of the refrigerant compressor to fall once to for example zero or a value close to zero, then causing them to gradually rise in a pattern of torque control of the refrigerant compressor and, when it is judged that the engine speed has fallen to a second judgement value, causing the fuel cut of the engine to end so as to secure the minimum necessary cooling capacity and extend the fuel cut time simultaneously.

Abstract: A refrigeration cycle is switched from a refrigeration cycle circuit to a hot gas heater circuit to make the hot gas discharged from a compressor flow into an evaporator and heat the vehicle passenger compartment, at which time, when a suction pressure (Ps) of the compressor becomes a low pressure below a first predetermined pressure, the discharge volume (Vc) of the compressor is made larger to ensure a sufficient auxiliary heating performance. Further, when the hot gas is made to flow into the evaporator to heat the vehicle passenger compartment, if the suction pressure (Ps). of the compressor becomes a higher pressure over a second predetermined pressure, the discharge volume (Vc) of the compressor is made smaller to protect the refrigeration cycle parts and lighten the ON, OFF shock.

Abstract: In a hybrid type compressor, a one-way clutch is provided between a magnet rotor and a rotor shaft for allowing rotational driving force generated by an electric motor unit to be transmitted only from a rotor to a shaft. Thus, the rotational driving force generated by a vehicle engine is not transmitted from the rotor shaft to the magnet rotor. That is, an inertia moment of a rotational system with respect to a vehicle engine is made small, thereby reducing the impact vibration when the clutch mechanism engages.

Abstract: A scroll-type variable-capacity compressor is disclosed in which a single spool is moved to open or close bypass ports and thereby change the capacity of compression chambers. Especially, the capacity can be controlled in satisfactory manner by opening the bypass ports to a specific position. Specifically, a first bypass port is arranged in the neighborhood of the contact point between the inner surface of the spiral wall of a fixed scroll and the outer surface of the spiral wall of a movable scroll making up one of the compression chambers with the capacity thereof reduced to a predetermined level. A second bypass port is arranged at a position on the side beyond a discharge port from the first bypass port but where the discharge port is not located on the line connecting the particular position and the first bypass port.

Abstract: A refrigeration cycle is switched from a refrigeration cycle circuit to a hot gas heater circuit to make the hot gas discharged from a compressor flow into an evaporator and heat the vehicle passenger compartment, at which time, when a suction pressure (Ps) of the compressor becomes a low pressure below a first predetermined pressure, the discharge volume (Vc) of the compressor is made larger to ensure a sufficient auxiliary heating performance. Further, when the hot gas is made to flow into the evaporator to heat the vehicle passenger compartment, if the suction pressure (Ps) of the compressor becomes a higher pressure over a second predetermined pressure, the discharge volume (Vc) of the compressor is made smaller to protect the refrigeration cycle parts and lighten the ON, OFF shock.

Abstract: In a scroll type compressor to be applied to a gas-injection type refrigerating cycle, an injection port is formed in a pressure receiving surface of a front housing, and a communication port is formed in a pressure transmitting surface of a movable scroll member. A spacer is provided between the pressure receiving surface and the pressure transmitting surface, and is fixed to the pressure receiving surface. The spacer has a penetration hole at a position corresponding to the injection port formed in the pressure receiving surface.