Chrysler Corporation

Kelsey-hayes Company

Erik Brom

Gary L Baker

Christopher P Thomas

Steven M Jakubiec

Michael A Zabat

David K Ganss

Raza Mirza

Brian E Agar

A vehicle climate control system operates an evaporator at a minimum temperature adjusted by a temperature offset. The control system determines a desired temperature and a blend potentiometer position that is indicative of the desired temperature. The control system determines a target temperature for the evaporator according to the blend potentiometer position, and calculates the temperature offset according to the target temperature and the blend potentiometer position. A blend door position is controlled according to the blend potentiometer position, the target temperature, the temperature offset, and heater core air temperature in order to optimize the operation of the evaporator.

HVAC control using modulated evaporator outlet temperature

A method and an apparatus are provided for variably controlling the temperature at which the clutch of an air conditioner compressor is engaged and disengaged. The temperature at which the compressor clutch is engaged and disengaged is based on an average minimum temperature at the evaporator over a clutch cycle, wherein the clutch disengage temperature is increased if the average minimum temperature is below a first predetermined temperature and is decreased if the average minimum temperature is above a second predetermined temperature, thus maintaining the average minimum temperature within a temperature range. Further, the clutch disengage temperature is adjusted based on user operated air conditioner control settings. The clutch disengage temperature is adjusted to a higher temperature if a low blower speed is selected by the user and is adjusted to a lower temperature if a high blower speed is selected. The clutch engage or turn on temperature is derived from the clutch disengage or turn off temperature and may in fact be set lower than the turn off temperature.

Method and apparatus for controlling the clutch of an air conditioner

Growing community of inventors

Winona, MN, United States of America

Erik Brom