Controller for heating in reversible air conditioning and heat p

Details Controller for heating in reversible air conditioning and heat p Controller for heating in reversible air conditioning and heat p

1998-11-12

2000-09-12

Paschall, Mark

Electric heating

Heating devices

Combined with diverse-type art device

219208, 219497, 219494, 623231, 623241, 623233, 62244, 165 43, H05B 102

Patent

active

061180998

ABSTRACT:
A reversible HVAC system for heating a passenger compartment of a motor vehicle is disclosed. The HVAC system includes a heat pump and an electric heater for supplying heat directly to air blown into the passenger compartment. A controller initially selects the heat pump to provide the heat that is directed into the passenger compartment. The heat pump attempts for a predetermined period of time to heat the passenger compartment to a target temperature. The controller stores a heat pump gain value representing the heating capacity of the heat pump before switching the heating operation to the electric heater. During operation of the electric heater, the controller calculates a system heat gain value representing the required heating capacity to maintain the passenger compartment at the target temperature. While the electric heater is operating, the controller continuously modifies the heat pump gain value to reflect changes in the ambient temperature. When the heat pump gain value approximately equals or exceeds the system gain value the controller selects the heat pump to provide heating.

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