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:
Apr. 06, 1976
Filed:
Jul. 05, 1974
Joe E Fuzzell, Peoria, IL (US);
Allan L Freedy, Aurora, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
Operating parameters of an engine, such as coolant temperature, oil pressure, air filter flow and the like, are continuously monitored by an electrical circuit responsive to sensor switches. The circuit distinguishes between conditions which require immediate correction, such as low oil pressure for example, and conditions such as reduced porosity of the air filter which need not necessarily be corrected immediately but which should be attended to at the end of the current vehicle operation. The two types of conditions are signalled to the operator by different means and the signalling means for noncritical conditions remains latched on after the engine has been shut down to alert maintenance personnel to the need for corrections. Means are provided for selectively testing the system, for discriminating against nonsignificant, brief, actuations of a sensor switch and for selectively turning off signalling means which have been latched on.