Scheduled comfort control system with adaptive compensation for stall and overshoot
AssigneeGeneral Motors Corporation
InventorsKenneth P. Adasek, William L. Drayer, Edward W. Yott
Life of this patent
Estimating the term…
Abstract
An automatic HVAC control system having a scheduled control in which the HVAC control variables are regulated in accordance with an empirically determined schedule to provide a desired comfort level in the vehicle, and an adaptive control which modifies the scheduled control when stall or overshoot conditions occur so that the design performance level of the system is achieved under all conditions.
Claims10
In a motor vehicle ventilation system having elements controllable to adjust the heating/cooling capacity of the system, an automatic control for operating the controllable elements to regulate the heating/cooling capacity at an optimal level which brings the actual comfort level in the vehicle into agreement with a desired comfort level and thereafter maintains such agreement, the control comprising:
- means for determining the desired comfort level, the actual comfort level, and a comfort level error indication according to the difference between the desired and actual comfort levels;
- scheduled control means for operating the controllable elements as a function of the comfort level error indication according to an empirically determined schedule designed to regulate the heating/cooling capacity of the system at said optimal level;
- and
- adaptive control means effective when the system heating/cooling capacity level brought about by said scheduled control means significantly deviates from said optimal level, resulting in an uncorrected comfort level error indication, for modifying the scheduled operation of the controllable elements in relation to the comfort level error indication so as to bias the heating/cooling capacity of the system toward said optimal level, thereby adaptively correcting the operation of the controllable elements for variations in the system performance and the heating/cooling requirements of the vehicle which are not accounted for by the scheduled control means.
In a motor vehicle ventilation system having elements controllable to adjust the heating/cooling capacity of the system, an automatic control for operating the controllable elements to regulate the heating/cooling capacity at an optimal level which brings the actual comfort temperature in the vehicle into agreement with a desired comfort temperature and thereafter maintains such agreement, the control comprising:
- means for determining the desired comfort temperature, the actual comfort temperature, and a comfort temperature error indication according to the difference between the desired and actual comfort temperatures;
- scheduled control means for generating a control factor N in relation to the comfort temperature error indication, and for operating the controllable elements according to an predetermined schedule based on said control factor N, the scheduled being empirically determined for regulating the heating/cooling capacity of the system at said optimal level;
- and
- adaptive control means effective when the system heating/cooling capacity level brought about by said scheduled control means significantly deviates from said optimal level, resulting in an uncorrected comfort temperature error indication, for modifying the control factor N in relation to the comfort temperature error indication so as to bias the heating/cooling capacity of the system toward said optimal level, thereby adaptively correcting the operation of the controllable elements for variations in the system performance and the heating/cooling requirements of the vehicle which are not accounted for by the scheduled control means.
Dependencies are inferred from the claim text.