Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Reexamination Certificate
2005-10-18
2005-10-18
Graham, Matthew C. (Department: 3683)
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
C303S015000, C188S11200R
Reexamination Certificate
active
06955406
ABSTRACT:
The invented apparatus is designed for use with a tow vehicle and trailer combination. The apparatus comprises a controller, a vacuum supply sensor, and a sensor unit used to measure the barometric pressure and/or elevation of the current location of the tow vehicle/trailer combination. Using information from the sensor unit, the controller determines a vacuum pump activation level and/or deactivation level appropriate for the ambient pressure in which the apparatus is operating. By monitoring the signal supplied by the vacuum supply sensor and by operating a vacuum pump switch signal, the controller maintains a supply of vacuum between the activation and deactivation levels. In this manner, the controller can compensate for changes in local conditions so as to operate the vacuum pump in an efficient manner while maintaining an adequate supply of vacuum for operation of the trailer brake system.
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Alston & Bird LLP
BluDot, Inc.
Graham Matthew C.
LandOfFree
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