Vehicle air conditioning system
AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorsKazuhiro Togaru, Hiroyuki Asada
Life of this patent
Estimating the term…
Abstract
A vehicle air conditioning system controls an engine and an air conditioner according to an air-conditioner load to thereby improve fuel economy and drivability of the vehicle. A higher compressor torque between a first estimated compressor torque, which is estimated according to the outside air temperature and the vehicle speed, and a second estimated compressor torque, which is estimated according to the refrigerant pressure, is adopted as an estimated compressor torque. When an air conditioner control switch is ON, an operational status of an engine and a compressor are controlled according to the adopted estimated compressor torque.
Claims13
A vehicle air conditioning system, comprising:
- a compressor driven by an engine, said compressor circulating a refrigerant for an air conditioner;
- an outside air temperature sensing device that senses an outside air temperature;
- a vehicle speed sensing device that senses a vehicle running speed;
- a compressor torque estimating device that estimates a compressor torque required by said compressor of said air conditioner, said compressor torque estimating device estimating a first compressor torque according to the sensed outside air temperature and the sensed vehicle running speed;
- and
- a control device for controlling an operational status of said engine according to said first compressor torque.
A vehicle air conditioning system, comprising:
- a compressor for circulating air-conditioning refrigerant, said compressor being driven by an engine;
- a compressor torque estimating device for estimating a compressor torque required by said compressor according to variations in an external load;
- and
- a control device for controlling an operational status of said engine according to the compressor torque estimated by said compressor torque estimating device.
A method for controlling an engine in a vehicle air conditioning system having a compressor for circulating an air-conditioning refrigerant, the compressor being driven by an engine, a high-pressure refrigerant pressure sensing device for sensing a high-pressure refrigerant pressure, an outside air temperature sensing device for sensing an outside air temperature, and a vehicle speed sensing device for sensing a vehicle running speed, the method comprising:
- estimating a first compressor torque according to the sensed outside air temperature and the sensed vehicle running speed;
- and
- controlling an operational status of said engine according to said first compressor torque.
Dependencies are inferred from the claim text.