Vehicle air conditioner with compressor noise reduction control

Details Vehicle air conditioner with compressor noise reduction control Vehicle air conditioner with compressor noise reduction control

1998-10-15

1999-09-14

Tanner, Harry B.

Refrigeration

Automatic control

Responsive to vehicle body motion or traction

62158, 622283, 622284, F24F 1102, B60H 100

Patent

active

059504404

ABSTRACT:
In an electric vehicle air conditioner, unpleasant compressor noise is reduced after issuance of an instruction to stop the operation of the air conditioner. An air conditioner controller calculates a delay time T1 from a map stored in a microcomputer in advance when an air conditioning switch or a blower switch is turned off and initializes a built-in timer to start counting. Thereafter, the speed of rotation of the coolant compressor (the speed of rotation of an electric motor) is decreased at the maximum rate of change of the speed of rotation through an inverter until the calculated delay time T1 passes. After the delay time T1 passes (after the counting by the timer terminates), the coolant compressor is stopped. The delay time T1 recorded in the map is set such that it becomes shorter with a decrease in the blower level.

REFERENCES:
patent: 5309728 (1994-05-01), Chae
patent: 5400611 (1995-03-01), Takeda et al.
patent: 5630323 (1997-05-01), Niijima et al.
patent: 5771704 (1998-06-01), Nakajima et al.

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