The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1982
Filed:
Feb. 15, 1980
Gene F Story, Westminster, CA (US);
John T La Belle, Long Beach, CA (US);
Automotive Environmental Systems, Inc., Westminster, CA (US);
Abstract
A temperature achievement controller for controlling the temperature of a device which is heated by a heating unit in accordance with a predetermined temperature versus time schedule. The controller includes apparatus for producing an analog signal which corresponds to the achieved temperature of the device under test and apparatus for producing an analog signal which corresponds to the desired temperature versus time schedule. An error signal equal to the difference between the achieved and desired temperature is generated and coupled to a three mode control unit which produces a control signal proportional to the sum of the derivative of the error signal, the integral of the error signal and the error signal itself. The control signal is received by a duty cycle modulator which controls the ratio of power on time to power off time of the power applied to the heating unit in accordance with the magnitude of the control signal.