Vehicle air conditioning system with expansion valve control dur

Details Vehicle air conditioning system with expansion valve control dur Vehicle air conditioning system with expansion valve control dur

1998-11-10

1999-08-10

Bennett, Henry

Refrigeration

Automatic control

Refrigeration producer

62DIG17, 62205, 62206, 62160, 62509, F25B 1300

Patent

active

059340940

ABSTRACT:
A control apparatus for a gas injection type air conditioning system that prevents lowering of compressor speed and cycle stoppage under conditions where high pressure is liable to occur. During a system heating mode, a pressure change rate ASP of the high pressure of the refrigerating cycle is calculated. When a pressure change rate .increment.SP rises above a predetermined value, a system electric expansion valve aperture is reduced. Accordingly, by calculation of the pressure change rate .increment.SP, it is possible to control the electric expansion valve in the above manner earlier than in prior art control schemes when there is a sudden rise in the high pressure.

REFERENCES:
patent: 5704219 (1998-01-01), Suzuki et al.
patent: 5778691 (1998-07-01), Suzuki et al.

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