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US 10,538,146 B2Granted
Reducing externally variable displacement compressor (EVDC) start-up delay
AssigneeFord Global Technologies, LLC
InventorsDebasish Dhar, Manfred Koberstein
Life of this patent
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Abstract
An externally-controlled variable displacement compressor (EVDC) cold-start method is described including, during an EVDC cold-start procedure, iteratively alternating an amount of a control current supplied to an electronic control valve (ECV) associated with the EVDC between no control current and a full control current. Systems for implementing the described method are provided.
Claims9
A system for controlling a cold-start of an externally-controlled variable displacement compressor (EVDC) for a vehicle heating, ventilation, and air conditioning (HVAC) system, comprising:
- the EVDC having an electronic control valve (ECV);
- an HVAC evaporator;
- one or more of an HVAC evaporator temperature sensor, a discharge air duct temperature sensor, and an in-car temperature sensor;
- and
- a controller configured for iteratively causing an amount of a control current supplied to the ECV during an EVDC cold-start procedure to alternate between no control current and a full control current;
- wherein the controller is further configured to terminate the EVDC cold-start procedure and to allow the full control current to the ECV on determining that an HVAC airflow temperature gradient value has decreased by a threshold value.
3 more elements
Dependencies are inferred from the claim text.