Denso Corporation

Kimihiko Sato

Yasutane Hijikata

Masato Komura

Tsuyoshi Takemoto

Haruo Kamiya

Yusuke Sakurai

Nobuhiro Miura

When a hybrid compressor starts being driven by an electric motor, the electric current of a capacity control valve is applied at an initial control electric current SS that is greater than a control electric current S, which is from the state of a refrigerating circuit. This triggers a swash plate of the hybrid compressor to be rapidly inclined. Thereafter, the electric current of the displacement control valve is applied at the control electric current S. This structure enables the displacement of the hybrid compressor to rapidly recover when the hybrid compressor starts being driven by the electric motor.

Hybrid compressor and control device

In a vehicle air conditioner, a compressor is driven by a vehicle engine, and a displacement of the compressor is controlled based on a cooling load. When a post-evaporator air temperature (TE) is higher than a predetermined value (TEO+&#x3b2;), it is determined that the cooling load is large, and the compressor is forcibly controlled at maximum displacement that is larger than a control value controlled based on the cooling load. Accordingly, the post-evaporator air temperature (TE) can be rapidly reduced to be lower than the predetermined value (TEO+&#x3b2;), so that a driving time of the vehicle engine can be made shorter. As a result, fuel consumption efficiency of the vehicle engine can be effectively improved.

Vehicle air conditioner

In a scroll type compressor, the center and outer periphery portions of the spiral elements are provided with relief for preventing the mutual contact of the spiral elements. Both of the spiral elements come to contact with each other at the intermediate portion thereof. The relief at the center portion is formed within the range defined by the winding angle Y&equals;32(X&minus;1) where X is the winding turn of each of the spiral elements. The range of the intermediate portion is 380&deg;. This construction serves to prevent the excessive pressure increase of the operation chamber at the center portion so that the brake down of the spiral elements may be prevented without lowering the efficiency of the compressor.

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Handa, Japan

Kimihiko Sato