Overspeed protection method for an automotive engine driven air

Details Overspeed protection method for an automotive engine driven air Overspeed protection method for an automotive engine driven air

1989-08-28

1990-11-13

Smith, Leonard E.

Refrigeration

Automatic control

Responsive to vehicle body motion or traction

417 53, 417222, 417212, F04B 126, B60H 132

Patent

active

049693344

ABSTRACT:
A control method for a variable capacity automotive engine driven air conditioning compressor in which the onset of an overspeed condition is anticipated in relation to the compressor speed and acceleration for the purpose of initiating an override of the normal control setting to quickly destroke the compressor so long as the overspeed condition is indicated. In normal operation, the control setting for the air conditioning system is chosen in relation to the current compressor speed. The compressor capacity is electrically controlled in relation to the error between the control setting and an actual or measured setting. Concurrently, a secondary control setting is determined based on an estimate of a future compressor speed, given the current rate of change in compressor speed. When the secondary control setting would produce more destroke than the primary control setting, the secondary control overrides the primary control to protect the compressor should the current conditions continue.

REFERENCES:
patent: 4796438 (1989-01-01), Sato
patent: 4823555 (1989-04-01), Ohkumo
patent: 4872814 (1989-10-01), Skinner et al.
patent: 4880356 (1989-11-01), Suzuki et al.

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