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Dynamic Behaviour of Variable Displacement Compressor for Automotive Air Conditioners
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English
Abstract
To meet the demand for improved comfort, driveability and fuel economy standards, a continuously variable displacement compressor has been developed. The compressor has a unique compression mechanism, which automatically changes displacement volume to exactly match vehicle air conditioning requirements. The compressor controls the pressure differential between the crankcase and the cylinder inlet and uses the pistons as actuators to change compressor displacement.
This paper outlines an analytical model for evaluating the dynamic behaviour of the variable displacement compression mechanism. The model gives detailed geometric and kinematic information regarding each element. It also calculates gas torque fluctuation, nutating motion of the wobble plate, constraint forces of each pair of machine elements and unbalanced forces of inertia. It calculates the pressure differential between the crankcase pressure and the cylinder inlet pressure required for displacement control.
These results can be used to estimate the effect of relevant parameters on variable displacement compressor kinematics.
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Authors
- Kenji Tojo - Mechanical Engineering Research Laboratory Hitachi, Ltd.
- Kunihiko Takao - Mechanical Engineering Research Laboratory Hitachi, Ltd.
- Masaru Ito - Mechanical Engineering Research Laboratory Hitachi, Ltd.
- Isao Hayase - Mechanical Engineering Research Laboratory Hitachi, Ltd.
- Yukio Takahashi - Sawa Works Hitachi, Ltd.
Citation
Tojo, K., Takao, K., Ito, M., Hayase, I. et al., "Dynamic Behaviour of Variable Displacement Compressor for Automotive Air Conditioners," SAE Technical Paper 900084, 1990, https://doi.org/10.4271/900084.Also In
References
- Skinner T. J. Swander R. L. “V-5 Automotive Variable Displacement Air Conditioning Compressor” SAE Paper No. 850040 1985
- Tojo K. et al “A Study of the Kinematics of a Variable Displacement Compressor for Automotive Air Conditioners” Prc. of the 1988 Purdue Compressor Technology Conference
- Inoue A. et al “Evalauation of Infinitely variable Displacement Compressor with Thermal Expansion Valve in a Motor Vehicle Air Conditioning System” SAE Paper 880052 1988
- Nishimura Y. et al “Development of Two-Stage Variable Displacement Compressor for Automotive Air Conditioning” SAE Paper NO. 850039 1985
- Takai K. et al “A 7-Cylinder IVD Compressor for automotive Air Conditioning” SAE Paper 890309 1989
- Below J. F. “Dynamics of the Swash Plate Mechanism” Prc. of the 1984 Purdue Compressor Technology Conference