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:
Sep. 16, 2014
Filed:
Mar. 22, 2012
Dayao Chen, Bolingbrook, IL (US);
Pengfei MA, Naperville, IL (US);
Tonglin Shang, Bolingbrook, IL (US);
Bryan J. Hillman, Peoria, IL (US);
Dayao Chen, Bolingbrook, IL (US);
Pengfei Ma, Naperville, IL (US);
Tonglin Shang, Bolingbrook, IL (US);
Bryan J. Hillman, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A system including a hydraulic accumulator, a pressure sensor, a fluid source and a data processor to detect a pre-charge pressure is provided. The hydraulic accumulator includes first and second fluid chambers and a separator therebetween. The hydraulic accumulator has an associated pre-charge pressure. The pressure sensor is connected to the first fluid chamber. The data processor is connected to the pressure sensor. The data processor is configured to determine a first and second rate of pressure changes, and a transition pressure between the first and second rates. The approximate pre-charge pressure is determined based on the transition pressure.