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:
Jun. 16, 1981
Filed:
Apr. 30, 1979
Peter Liermann, Gehrden, DE;
WABCO Fahrzeugbremsen GmbH, Hanover, DE;
Abstract
Signals representing actual and desired speeds of a vehicle are separately applied to a plurality of parallel comparator channels or devices. Each comparator device responds to a different level of difference between the speed signals, when actual is greater than desired, to produce output signals at successively higher levels. The first comparator device controls a first deceleration device, e.g., an exhaust throttle, to reduce vehicle speed when an output signal is produced at the first preselected level of difference. The second and third comparator devices control the second and third deceleration devices, respectively, e.g., an eddy-current brake, automatic transmission, etc., when each produces an output signal at its preselected difference level, but only if the next lower comparator output has enabled a gate or switch coupling the higher level comparator and deceleration devices. Thus the deceleration control is increased in successive steps as the speed difference increases if each successive deceleration device is actuated in order by the associated comparator.