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An air conditioning system for a vehicle has a plurality of heat enhancing means including at least a hot gas heater cycle for heating air blown into a passenger compartment by directly introducing a discharged gas refrigerant from a compressor into an interior heat exchanger. Additionally, an elect

An air conditioning system for a vehicle has a plurality of heat enhancing means including at least a hot gas heater cycle for heating air blown into a passenger compartment by directly introducing a discharged gas refrigerant from a compressor into an interior heat exchanger. Additionally, an electric heater is provided as another passenger compartment heating enhancing means. When heat requirements are high (outside air temperature is low), both the hot gas heater cycle and the electric heater are activated, and when the heat requirements decrease, the hot gas heater cycle is deactivated first, and then the electric heater is deactivated. Therefore, the adverse effects of a vehicle compartment temperature that the driver is sensing can be avoided. Additionally, controlling vehicle window fogging associated with an operation of the hot gas heater cycle is possible.

대표청구항 ▼

An air conditioning system for a vehicle has a plurality of heat enhancing means including at least a hot gas heater cycle for heating air blown into a passenger compartment by directly introducing a discharged gas refrigerant from a compressor into an interior heat exchanger. Additionally, an elect

An air conditioning system for a vehicle has a plurality of heat enhancing means including at least a hot gas heater cycle for heating air blown into a passenger compartment by directly introducing a discharged gas refrigerant from a compressor into an interior heat exchanger. Additionally, an electric heater is provided as another passenger compartment heating enhancing means. When heat requirements are high (outside air temperature is low), both the hot gas heater cycle and the electric heater are activated, and when the heat requirements decrease, the hot gas heater cycle is deactivated first, and then the electric heater is deactivated. Therefore, the adverse effects of a vehicle compartment temperature that the driver is sensing can be avoided. Additionally, controlling vehicle window fogging associated with an operation of the hot gas heater cycle is possible. r housing and having a turbine wheel disposed therein that is coupled to the first end of the shaft; a first variable geometry member disposed within the turbine housing between an exhaust gas inlet and the turbine wheel; a compressor housing attached to another side of the center housing opposite the turbine housing and having a compressor impeller disposed therein, the compressor impeller being coupled to the second end of the shaft; a second variable geometry member disposed within the compressor housing and interposed between an air outlet and the compressor impeller; and an actuator assembly disposed within the turbocharger and connected to the first and second variable geometry members to provide simultaneous actuation of the same; wherein the actuator assembly includes an actuator crank disposed axially through the turbocharger center housing and coupled at opposite ends to the first and second variable geometry members; a piston assembly disposed within the center housing and coupled to the actuator crank by rack and pinion gear engagement: and a solenoid valve attached to the turbocharger and configured to provide reciprocating movement of the piston assembly by electro-hydraulic force. 2. The turbocharger as recited in claim 1 wherein the first variable geometry member comprises: a plurality of movable vanes positioned radially outwardly away from and concentrically around the turbine wheel, the vanes being pivotably attached at a first axial surface to a turbine housing wall surface; and a unison ring rotatably mounted adjacent a second axial surface of each vane, the unison ring comprising a plurality of slots disposed therein, wherein each slot accommodates an actuating tab projecting from a respective vane; wherein the unison ring is connected to the actuator assembly effect movement the unison ring and rotation of the each of the vanes. 3. The turbocharger as recited in claim 1 wherein the second variable geometry member comprises: a plurality of movable vanes positioned radially outwardly away from and concentrically around the compressor impeller; and a unison ring rotatably mounted adjacent an axial surface of each vane, the unison ring comprising a plurality of slots disposed therein wherein each slot accommodates an actuating tab projecting from a respective vane; wherein the unison ring is connected to the actuator assembly effect movement the unison ring and rotation of the each of the vanes. 4. The turbocharger as recited in claim 1 wherein the actuator assembly further comprises means for imposing a mechanical spring force onto the solenoid valve, and wherein the solenoid valve is a proportional solenoid for providing a balancing force against the mechanical spring force. 5. The turbocharger as recited in claim 4 wherein the balancing force generated by the proportional solenoid is a function of a signal from an engine electronic control unit. 6. The turbocharger as recited in claim 5 wherein the engine electronic control unit determines the signal for the proportional solenoid as a function of the engine speed of an internal combustion engine. 7. A variable geometry turbocharger for internal combustion engines, the turbocharger comprising: a center housing; a shaft positioned axially within the housing, the shaft having a first end and a second end; a turbine housing attached to one side of the center housing and having a turbine wheel disposed therein that is coupled to the first end of the shaft; a first variable geometry member disposed within the turbine housing comprising: a plurality of movable turbine vanes interposed between an exhaust gas inlet and the turbine wheel; and a turbine unison ring rotatably positioned adjacent the plurality of turbine vanes and coupled to the turbine vanes to effect rotation of the turbine vanes radially inwardly towards or outwardly from the turbine wheel; a compressor housing attached to another side of the center housing opposite