Abstract: A variable displacement compressor for efficiently cooling and lubricating seals arranged on a rotary shaft. The seals are arranged at end portions of the rotary shaft that project from a housing of the compressor. A first lubrication chamber is defined by a first seal in the housing around the front end portion of the rotary shaft. A second lubrication chamber is defined by a second seal in the housing around the rear end portion of the rotary shaft. A shaft passage extends through the rotary shaft to connect the first and second lubrication chambers. Refrigerant gas including lubricating oil flows from a crank chamber to a suction chamber via the first lubrication chamber, the shaft passage, and the second lubrication chamber. This efficiently cools and lubricates the seals.

Abstract: A compressor for a vehicle air conditioner includes a pressure sensor and a torque computing unit for computing the compressor torque. The compressor also has a communication unit that allows data communication with other devices based on vehicle data communication protocols. The torque computing unit and the communication unit are integral with the compressor. Therefore, it is possible to calculate the driving torque quickly, and an engine electronic control unit can control an engine such that the torque required for the compressor can be quickly generated.

Abstract: A variable displacement compressor for efficiently cooling and lubricating seals arranged on a rotary shaft. The seals are arranged at end portions of the rotary shaft that project from a housing of the compressor. A first lubrication chamber is defined by a first seal in the housing around the front end portion of the rotary shaft. A second lubrication chamber is defined by a second seal in the housing around the rear end portion of the rotary shaft. A shaft passage extends through the rotary shaft to connect the first and second lubrication chambers. Refrigerant gas including lubricating oil flows from a crank chamber to a suction chamber via the first lubrication chamber, the shaft passage, and the second lubrication chamber. This efficiently cools and lubricates the seals.

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 control valve is located in a variable displacement compressor that is installed in a refrigerant circuit. The control valve operates such that the pressure difference between first and second pressure monitoring points in the refrigerant circuit seeks a predetermined target value. The first pressure monitoring point is located in a discharge chamber of the compressor. The second pressure monitoring point is located in a flow pipe that extends from the discharge chamber. The static pressure of refrigerant in the discharge chamber is introduced into a control valve from the first pressure monitoring point. A pressure that includes the static pressure and the dynamic pressure of refrigerant in the flow pipe is introduced into the control valve from the second pressure monitoring point. As a result, the displacement of the compressor is reliably controlled without being affected by the thermal load of an evaporator.

Abstract: A compressor for a vehicle air conditioner includes a pressure sensor and a torque computing unit for computing the compressor torque. The compressor also has a communication unit that allows data communication with other devices based on vehicle data communication protocols. The torque computing unit and the communication unit are integral with the compressor. Therefore, it is possible to calculate the driving torque quickly, and an engine electronic control unit can control an engine such that the torque required for the compressor can be quickly generated.

Abstract: In the transmission and air conditioning control system having an air conditioner provided with a compressor driven by an engine and an evaporator for cooling a passenger room, and a transmission connected between the engine and a wheel, an electronically control device controls the transmission ratio to a reference value to be decided by the operating condition of the vehicle and also to a final value, which is higher than the reference value, when a degree of cooling demand is greater than a predetermined value. As a result, the revolution of the engine is more increased so that the revolution of compressor may be more increased to improve the cool down performance.

Abstract: An air-conditioning apparatus having a refrigerant circuit including a condenser, a pressure reducing device, an evaporator, and a variable displacement compressor. The air-conditioning apparatus has a torque detecting device and an external information detecting device. The torque detecting device directly or indirectly detects the reaction torque acting on the compressor, and the external information detecting device detects various external information other than the torque. The air-conditioning apparatus further has a control device for determining a target torque in accordance with the external information provided by the external information detecting device. The control device executes a feedback control program for controlling the displacement of the compressor such that the torque detected by the torque detecting device approaches the target torque.

Abstract: A control valve is located in a variable displacement compressor that is installed in a refrigerant circuit. The control valve operates such that the pressure difference between first and second pressure monitoring points in the refrigerant circuit seeks a predetermined target value. The first pressure monitoring point is located in a discharge chamber of the compressor. The second pressure monitoring point is located in a flow pipe that extends from the discharge chamber. The static pressure of refrigerant in the discharge chamber is introduced into a control valve from the first pressure monitoring point. A pressure that includes the static pressure and the dynamic pressure of refrigerant in the flow pipe is introduced into the control valve from the second pressure monitoring point. As a result, the displacement of the compressor is reliably controlled without being affected by the thermal load of an evaporator.

Abstract: In a swash plate type compressor, a rotational shaft makes a piston reciprocate through a swash plate. A suction valve plate is connected to an eccentric portion of the shaft and caused to orbit around an axis of the shaft by rotation of the shaft. Friction between the suction valve plate and a contacting end wall in which a suction port is formed naturally suppresses the rotational motion of the valve plate. Therefore, the valve plate substantially orbits about the shaft axis without rotating and opens and closes the suction port. A relative velocity between the valve plate and the end wall when the valve plate orbits without rotating is smaller than when the valve plate only rotates.

Abstract: An improved displacement control valve incorporated in a variable displacement compressor. The control valve includes a valve body and a solenoid for actuating the valve body. The coil of the solenoid is wound about a bobbin made of insulating synthetic resin. A base plate integrally protrudes from the bobbin. A pair of conducting plates are secured to the base plate. Each plate has a clamping block. The coil has a pair of terminal wires. Each terminal wire is secured to and electrically corrected to one of the clamping blocks. Each terminal wire is wound about a holder formed in each plate between the bobbin and the corresponding clamping block. A diode is secured to the holders and is connected in parallel with the coil. A pair of terminals of the diode are secured to the corresponding holders by soldering and crimping. The holders prevent tension in the terminal wires from being applied to electrical joints formed between the wires and the clamping blocks, which makes the valve more reliable.

Abstract: A swash-plate type compressor comprises a plurality of cylinder chambers parallel to each other, a shaft, a swash plate connected to the shaft for rotation therewith and for wobbling motion due to the rotation, and a plurality of pistons subject to wobbling motion of the swash plate for reciprocation within the respective cylinder chambers. The shaft and the swash plate are connected to each other through a slot formed in one of them and a pin provided on the other, so the swash plate can wobble. A position of a center of rotation of the swash plate is supported by a spool device movable in coaxial relation to the shaft. Displacement of the spool device causes the position of the center of rotation of the swash plate and an inclination thereof to be varied to vary a reciprocative stroke of each piston, thereby controlling discharge capacity of the compressor.

Abstract: A swash plate type compressor has a rotary shaft, an inclined swash plate for rotation with the shaft, and a plurality of pistons connected to the swash plate. Each piston defines at both ends thereof a pair of working chambers. The piston reciprocates while being subjected to a swing motion concomitant with the rotation of the swash plate, to suck a fluid into the working chambers for compression. The swash plate is mounted on the shaft through a support unit which serves to selectively vary the inclination of the swash plate and shift the center of rotation of the swash plate along the shaft. The fluid is introduced from a suction passage through and around the swash plate to suction chambers formed adjacent the working chambers. A bypass passage is formed to directly communicate the suction passage with the suction chamber on one side of the shaft while bypassing the swash plate.