Delphi Technologies, Inc.

John M Kirchberger

Mingyu Wang

Charles Andrew Archibald

John Lawrence Pawlak, Iii

Sean Michael Kelly

Ernesto Jose Gutierrez

An improved motor vehicle automatic climate control methodology develops HVAC commands for transient phase operation independent of the HVAC commands calibrated for steady-state phase operation. At system activation, a transient phase indicator is initialized based on the cabin temperature and the set temperature, and thereafter updated to reflect progress toward steady-state phase operation. The steady-state HVAC commands are based on ambient conditions and the set temperature, and the HVAC commands at system activation are based on the steady-state commands and offsets based on the initial in-car temperature. A transient modifier based on the transient phase indicator brings the initial HVAC commands into correspondence with the steady-state HVAC commands as the cabin temperature approaches the set temperature. The transient modifier can be a power function of the transient phase indicator, and the HVAC commands can be clamped at the initial values until the transient phase indicator reflects a predetermined amount of progress toward the steady-state phase.

Automatic climate control with tunable transient response

A motor vehicle automatic climate control computes the HVAC power requirement for cabin air temperature regulation, and determines corresponding air discharge temperature and blower motor speed commands using a two-step table look-up procedure. Nominal air discharge temperature and blower motor speed profiles are tabulated as a function of a Power Index generally corresponding to ambient temperature, and used along with the set temperature to form a table of HVAC power requirement vs. Power Index. In vehicle operation, the HVAC power requirement vs. Power Index table is used to retrieve a Power Index corresponding to the computed HVAC power requirement, and the air discharge temperature and blower motor speed tables are then used to retrieve air discharge temperature and blower motor speed commands based on the retrieved Power Index.

Power-based control method for a vehicle automatic climate control

A motor vehicle automatic climate control determines HVAC parameter values for satisfying the required heating or cooling effort for steady-state cabin air temperature regulation, and controls the HVAC settings based such parameter values and on the deviation of the cabin air temperature (T ) from the set temperature (TSET). If T is within a specified control band about TSET, the HVAC settings are controlled in accordance with the determined HVAC parameter values, but when T overshoots or undershoots the control band, the control enters a quasi-steady-state mode in which the control parameters are reset to drive T back in to the control band, and then brought into correspondence with the respective determined values based on the degree to which the overall control objective of regulating T at TSET is achieved.

Quasi-steady-state control method for a vehicle automatic climate control

A non-linear control method for an air conditioning system utilizes fuzzy logic to regulate the activation of a displacement control valve for a variable displacement compressor for maintaining a system parameter, such as the evaporator outlet pressure or temperature, at a desired value. The control inputs include the system parameter to be controlled and a refrigerant pressure that reflects changes in the compressor displacement.

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Gasport, NY, United States of America

John M Kirchberger