US 5,507,155 AGranted

Compressor control apparatus and method for an automobile air-conditioning system

AssigneeZexel Corporation

InventorYasutaka Negishi

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Abstract

An automobile air-conditioning system has a compressor driven by an electric motor, a main condenser for cooling which is provided outside a car-room, a subcondenser for heating which is provided in the car-room, an evaporator provided in the car-room and a changeover valve for switching refrigerant paths, and executes a heating operation and a cooling operation by switching refrigerant paths by the changeover valve. When an air-conditioning mode is a heating mode and a room temperature of the automobile is below a prescribed temperature, a revolution of the compressor is compensated by a first prescribed revolution pitch according to a discharge temperature of a refrigerant delivered from the compressor. When the air-conditioning mode is the heating mode and the room temperature of the automobile is above the prescribed temperature, the revolution of the compressor is compensated by a second prescribed revolution pitch which is larger than the first prescribed revolution pitch according to the discharge temperature of the refrigerant delivered from the compressor.

Claims26

Dependent claims

A compressor control apparatus for an automobile air-conditioning system having a compressor driven by an electric motor, a main condenser for cooling which is provided outside a car-room, a sub-condenser for heating which is provided in the car-room, an evaporator provided in the car-room, and a changeover valve for switching between refrigerant paths, and performing a heating operation and a cooling operation by switching the refrigerant paths by said changeover valve, comprising;

air-conditioning mode judging means for judging whether an air-conditioning mode is a heating mode;
room temperature detecting means for detecting whether a room temperature of the automobile is below a prescribed room temperature;
refrigerant discharge temperature detecting means for detecting a discharge temperature of a refrigerant delivered from said compressor;
first revolution compensating means, responsive to said air-conditioning mode judging means, said room temperature detecting means and said refrigerant discharge temperature detecting means, for compensating a revolution of said compressor with a first prescribed revolution pitch according to the refrigerant discharge temperature detected by said refrigerant discharge temperature detecting means when the air-condition mode is the heating mode and the room temperature of the automobile is below said prescribed room temperature;
second revolution compensating means, responsive to said air-conditioning mode judging means, said room temperature detecting means and said refrigerant discharge temperature detecting means, for compensating the revolution of said compressor with a second prescribed revolution pitch, which is larger than said first prescribed revolution pitch, according to the refrigerant discharge temperature detected by said refrigerant discharge temperature detecting means when the air-condition mode is the heating mode and the room temperature of the automobile is above said prescribed room temperature.

2 more elements

A compressor control method for an automobile air-conditioning system having a compressor driven by an electric motor, a main condenser for cooling which is provided outside a car-room, a sub-condenser for heating which is provided in the car-room, an evaporator provided in the car-room and a changeover valve for switching refrigerant paths, and performing a heating operation and a cooling operation by switching refrigerant paths by said changeover valve, comprising the steps of:

(a) judging whether an air-conditioning mode is a heating mode;
(b) detecting whether a room temperature of the automobile is a prescribed room temperature;
(c) detecting a discharge temperature of a refrigerant delivered from said compressor;
(d) compensating a revolution of said compressor by a first prescribed revolution pitch according to the detected refrigerant discharge temperature when the air-conditioning mode is the heating mode and the room temperature of the automobile is below the prescribed room temperature;
and
(e) compensating the revolution of said compressor by a second prescribed revolution pitch which is larger than said first prescribed revolution pitch according to the detected refrigerant discharge temperature when the air-conditioning mode is the heating mode and the room temperature of the automobile is above the prescribed room temperature.

3 more elements

air-conditioning mode judging means for judging whether an air-conditioning mode is a heating mode;
room-temperature detecting means for detecting a room temperature of an automobile;
maximum revolution setting means, responsive to said air-conditioning mode judging means and said room temperature detecting means, for setting a maximum revolution of said compressor based on a room temperature of the automobile detected by said room temperature detecting means when the air-conditioning mode is the heating mode, said maximum revolution setting means setting the maximum revolution of said compressor high when the room temperature of the automobile is low, and setting the maximum revolution of said compressor lower accordingly as the room temperature of the automobile rises;
and
revolution controlling means, responsive to said maximum revolution setting means, for controlling the revolution of said compressor so that the set maximum revolution is not exceeded.

2 more elements

(a) judging whether an air-conditioning mode is a heating mode;
(b) detecting a room temperature of the automobile;
(c) setting a maximum revolution of said compressor high when the room temperature of the automobile is low, and setting the maximum revolution of said compressor lower accordingly as the room temperature of the automobile rises, in case that the air-conditioning mode is the heating mode;
and
(d) controlling the revolution of said compressor so that the set maximum revolution is not exceeded.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/337,029Filed 7 Nov 1994
Priority: JP 5-30714112 Nov 1993
Granted: 16 Apr 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B60H 1/3222
Using compression: characterised by the compressor driving arrangements, e.g. clutches, transmissions or multiple drives
F25B 49/022
For compression type machines, plants or systems: compressor control arrangements
F25B 2500/07
Problems to be solved: exceeding a certain pressure value in a refrigeration component or cycle
B60H
Arrangements of heating, cooling, ventilating or other air-treating devices specially adapted for