Other

Delphi Technologies, Inc.

Renault

Laurent Pittion

John F O'Brien

Jean-Luc Menager

Gerard Olivier

The invention concerns a method using a system () for heating or cooling air in a motor vehicle passenger compartment provided with a windscreen, by input into the passenger compartment air which has passed through an exchanger () comprised in a refrigerant loop. The invention is characterized in that it comprises steps which consist in measuring the temperature of the air leaving the exchanger (), measuring the humidity of the air leaving the exchanger (), determining the dew point of the air leaving the exchanger () based on said temperature and humidity, determining the windscreen temperature, comparing the dew point with the windscreen temperature and stopping the heating of air in the passenger compartment when the dew point is higher than the windscreen temperature.

Air-conditioning device for vehicles, and method therefor

An air conditioning system (,) for a passenger compartment of a motor vehicle having a windscreen comprises a first heat exchanger (,) positionable outside the passenger compartment; a second heat exchanger (,) positionable inside the passenger compartment; an expansion device (,) positioned in a first fluid passage (,) between the heat exchangers; an electronically controlled variable stroke compressor (,) for pumping fluid into the second fluid passage and either in a first direction (X) or in a second direction (Y); reverse flow means (,) in the second fluid passage for controlling the direction of the flow of fluid; first sensing means (,) providing a first output signal indicative of the dewpoint temperature of the air leaving the second heat exchanger; second sensing means (,) providing a second output signal indicative of the temperature of the windscreen; and control means (,) electrically connected to the first and second sensing means and to the compressor for receiving the first and second output signals, for determining the dewpoint temperature for the air leaving the second heat exchanger dependent on the first output signal, for determining the windscreen temperature from the second output signal, for comparing the determined dewpoint temperature to the determined windscreen temperature, and for controlling the stroke of the compressor to maintain the dewpoint temperature at or below the windscreen temperature during fluid flow in the second direction. Reduces the risk of internal fogging of the windscreen.

Air conditioning system for a motor vehicle

An air conditioning system (,) for a passenger compartment of a motor vehicle comprises a first heat exchanger (,) positionable outside the passenger compartment; a second heat exchanger (,) positionable inside the passenger compartment; an expansion device (,) positioned in a first fluid passage (,) between the heat exchangers; an electronically controlled variable stroke compressor (,) for pumping fluid into the second fluid passage and either in a first direction (X) or in a second direction (Y); reverse flow means (,) in the second fluid passage for controlling the direction of the flow of fluid; first sensing means (,) providing a first output signal indicative of the actual temperature of the air leaving the second heat exchanger; second sensing means (,) providing a second output signal indicative of the humidity of the air leaving the second heat exchanger; third sensing means (,) providing a third output signal indicative of the temperature of the air in the passenger compartment; and control means (,) electrically connected to the first, second and third sensing means and to the compressor for receiving the first, second, and third output signals, for determining a maximum temperature for the air leaving the second heat exchanger dependent on the second and third output signals, for comparing the determined maximum temperature to the actual temperature, and for controlling the stroke of the compressor to maintain the actual temperature at or below the determined maximum temperature during fluid flow in the second direction. Reduces the risk of unacceptable levels of hot saturated air reaching the passenger compartment.

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Metz, France

Laurent Pittion