Compressor malfunction device having engine start-up override

Details Compressor malfunction device having engine start-up override Compressor malfunction device having engine start-up override

1986-03-05

1987-11-03

Tanner, Harry B.

Refrigeration

Automatic control

Responsive to vehicle body motion or traction

62158, 62126, B60H 132

Patent

active

047036273

ABSTRACT:
The present invention is directed to a device for sensing compressor malfunctions and disengaging the compressor from the engine's driving force upon detection of a malfunction. A malfunction is defined herein as the rotation of the compressor below a predetermined speed. In situations where the compressor is on during engine start-up, the engine's starting motor will be exerted to the extent that the engine, and hence the compressor, will not rotate at its proper speed, making engine start-up more difficult. In order for the engine start-up condition not to produce a malfunction detection and erroneously disengage the compressor from the system, a malfunction override circuit is provided. The override circuit comprises a capacitor which is discharged through a transistor connected to the relay for controlling the current to the clutch coil. The relay remains closed due to this capacitor voltage, and the compressor remains engaged, thereby overriding the malfunction detector during engine start-up.

REFERENCES:
patent: 3931560 (1976-01-01), Willson
patent: 4005585 (1977-02-01), Matthews
patent: 4028593 (1977-06-01), Newell
patent: 4045973 (1977-09-01), Anderson et al.
patent: 4355959 (1982-10-01), Kono et al.
patent: 4393966 (1983-07-01), Kono et al.
patent: 4462491 (1984-07-01), Kono et al.
patent: 4480961 (1984-11-01), Kono et al.

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