Diesel Kiki Co., Ltd.

Zexel Valeo Climate Control Corporation

Fuji Koki Manufacturing Co., Ltd.

Nobuhiko Suzuki

Masaya Sasaki

Shinji Sutoh

David L Thomas

Tetuya Aoki

Variable-capacity control is reliably carried out without using a large pressure control valve while maintaining sufficient pressure resistance in a refrigerating cycle in which carbon dioxide is used as its coolant. A pressure sensor for measuring the pressure on the low pressure side of this refrigerating cycle is used. The electromagnetic coil of the pressure control valve is controlled so that the measured pressure approaches the target value. Low pressure is applied equally to both ends in the direction of movement of the valve disc of the pressure control valve, so that the valve disc can be moved by a light load, and hence the size of the electromagnetic coil can be small.

Variable-capacity control for refrigerating cycle without using a large pressure control valve

An automobile air-conditioner of the type having a heat pump includes an exhaust gas heat exchanger for heating an engine cooling water by means of engine exhaust gas for rapidly increasing the temperature of air passing through a heater core when the heating operation is started, and a bypass passage bypassing a part of the engine cooling water and disposed in contact with a heat exchanger of the heat pump so as to achieve heat exchange operation between a refrigerant and the engine cooling water.

Air-conditioner for automobiles

A pressure control valve for a variable displacement swash plate type compressor includes a valve element movable under a combined force of the force of a pressure responsive member and the force of a solenoid. The valve element is engageable with a valve seat which is positionally adjustably mounted on a valve case of the pressure control valve and movable in the direction of movement of the valve element. The solenoid includes an armature to which an adjustment screw is threadedly connected. The extent of the adjustment screw which projects from the armature is adjustable so that the position of the valve element is adjustable relative to the valve seat. With this arrangement, it is possible to adjust the pressure controlling characteristics exactly.

Pressure control valve for variable displacement swash plate type

An automobile air conditioner system includes a variable displacement compressor having a wobble plate and a pressure control valve disposed in the compressor for controlling the pressure in a crank chamber. The pressure control valve is operative under the control of predetermined conditions, such as the temperature of an evaporator.

Air conditioner system for automobiles

A method of controlling the capacity of a variable capacity wobble plate compressor from an air conditioning system wherein the compressor capacity is controlled such that the degree of communication between a suction chamber and a crankcase is controlled by a pressure control valve to vary the crankcase pressure and hence the angularity of the wobble plate. The value of at least one parameter representing thermal load is detected, the magnitude of current to be supplied to an electromagnetic actuator of the pressure control valve is determined in response to the detected parameter value, and the opening of the pressure control valve is determined in response at least to the determined magnitude of current.

Method and system for controlling capacity of variable capacity wobble

A control system for controlling a compressor for an air conditioning system of a vehicle. A variable capacity type compressor is disposed to be driven by an engine of the vehicle. The compressor is adapted to vary in capacity with a change in pressure within a crank chamber thereof. A first calculator calculates thermal load on the air conditioning system, and a second calculator calculates the rotational speed of the engine. An upper limit setter sets an upper limit value of suction pressure within the compressor in such a manner that the upper limit value is increased with an increase in the thermal load, and decreased with an increase in the rotational speed of the engine. A capacity controller is responsive to a difference between the set upper limit value of suction pressure and the sensed actual suction pressure for adjusting the pressure within the crank chamber to vary the capacity of the compressor.

Control system for variable capacity type compressor for air

A variable capacity wobble plate compressor in which a pressure regulating valve is arranged across a communication passageway communicating between a high pressure chamber and a crankcase, wherein the crankcase pressure is controlled through selective closing and opening of said pressure regulating valve, to thereby vary the capacity of the compressor. An oil guide passage means communicates between a lower portion of the high pressure chamber and an inlet port of the pressure regulating valve. When the pressure regulating valve is open, lubricating oil which has collected in the high pressure chamber is returned to the crankcase through the oil guide passage means, the open pressure regulating valve, and part of the communication passageway.

Variable capacity wobble plate compressor with improved means for

An air conditioning system for a vehicle has a compressor adapted to vary its capacity so as to maintain the suction pressure of refrigerant. A door is arranged upstream of the evaporator in an air passage, which can assume a variable opening to vary the refrigerating capacity of the evaporator. The opening of the door is controlled in response to the set position of temperature setting means which sets the discharge air temperature, whereby the refrigerating capacity of the evaporator can be reduced when overcooling takes place, to thereby reduce the work done by the compressor for minimizing a waste of energy.

Energy-saving air conditioning system for vehicles

A control method for an air conditioning system for a vehicle, which is driven by an engine installed on the vehicle. The control method comprises selecting either a first control manner of controlling the air conditioning system so as to preferentially ensure required driveability of the engine, or a second control manner of controlling the air conditioning system so as to preferentially ensure required cooling capacity of the system, and controlling the air conditioning system in accordance with the selected control manner.

Control method for air conditioning systems for vehicles

A control system for controlling an air conditioning system having a variable delivery compressor and an evaporator for cooling and dehumidifying air supplied thereto from a blower. The control system comprises sensor means for sensing the evaporator boiling pressure, determining means for determining whether or not the detected value of evaporator boiling pressure has reached either a predetermined upper limit or a predetermined lower limit, and control means for controlling the capacity of the compressor over its maximum variable range and also the quantity of air supplied from the blower so as to maintain the evaporator boiling pressure at one of the predetermined upper and lower limits which is determined to have been reached by the detected boiling pressure value.

Growing community of inventors

Konan, Japan

Nobuhiko Suzuki