Variable temperature control system for vehicles

摘要

A rotary temperature control system for use in controlling the temperature of a blended air stream supplied to a vehicle passenger compartment includes a manually operable rotary control knob (12) operatively connected with a control pulley (18) that is, in turn, connected through a pull-pull cable system (20) to a vent pulley (22). The vent pulley (22) operates a blend door (14) that controls the output temperature of a blended air stream. A drive connection between the vent pulley and a drive shaft of the blend door includes non-circular gears for producing a predetermined generally non-linear relationship between rotary movement of the control pulley and rotary movement of the output shaft to produce a generally linear relationship between the rotary movement of the control pulley and the temperature of the air stream throughout a major portion of the rotary movement of the control pulley.