Vehicle HVAC control

Details Vehicle HVAC control Vehicle HVAC control

2011-03-22

2011-03-22

Norman, Marc E (Department: 3744)

Refrigeration

Automatic control

Time or program actuator

C062S231000, C180S065270

Reexamination Certificate

active

07908877

ABSTRACT:
A method of controlling a HVAC system for a hybrid vehicle having a refrigerant compressor driven by an engine is disclosed. The method may comprise: determining a requested air conditioning operating point for a passenger compartment; estimating a time to reach the requested operating point; based on the previous steps, estimating a maximum allowed compressor off time; determining if the allowed compressor off time is greater than a minimum engine off time; if the allowed compressor off time is greater than the engine off time, determining if the vehicle is entering an allowable engine off mode; if so, commencing engine shut-off mode; if engine shut-off is anticipated, prior to commencing the shut-off mode, adjusting the HVAC system to maximize cooling of the passenger compartment with minimum energy usage; and if the engine shut-off is commenced, monitoring the HVAC system to determine when engine restart is needed to maintain comfort.

REFERENCES:
patent: 2002/0043072 (2002-04-01), Hamachi et al.
patent: 2007/0186573 (2007-08-01), Ziehr et al.

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