Electropneumatic braking system
AssigneeAllied-Signal Inc.
InventorsWilliam A. Singleton, Robert D. Burns
Life of this patent
Estimating the term…
Abstract
A control for an electropneumatic braking system applies a step function to a electronically operated proportional modulator to improve transient response. The current is controlled by a treadle operated signal generator operated by the vehicle operator and by actual feedback braking pressure as generated by a pressure sensor which senses braking pressure. The system includes a master controller which receives and processes information from the operator operated treadle operated signal generator and transmits desired pressure signals to wheel controllers which independently control each wheel of the vehicle.
Claims15
Method of controlling braking pressure in a fluid pressure braking system comprising the steps of generating a demanded braking pressure signal representing demanded braking pressure, measuring actual braking pressure and generating an actual braking pressure signal representing actual braking pressure, calculating a control signal for controlling an electrically actuated proportional brake pressure modulator for controlling braking pressure as a function of the magnitude of said control signal applied to the modulator, said control signal being calculated from the demanded braking pressure signal and the actual braking pressure signal, and modifying the magnitude of said control signal by a step increment when the pressure demand signal, the actual braking pressure signal, and the demanded braking pressure signal satisfy predetermined criteria.
Method of controlling braking pressure as claimed in claim 6, including the step of recalculating said control signal during each of successive time periods, and establishing the size of the step increment for each time period as a function of the increment in demanded braking pressure signals between successive time periods.
System for controlling braking pressure in a fluid pressure braking system comprising an electrically actuated proportional brake pressure modulator for controlling braking pressure as a function of the magnitude of a control signal activating said modulator, an operator-actuated brake treadle for generating a demanded braking pressure signal representing the magnitude of a brake application demanded by the vehicle operator, a master controller for receiving said demanded braking pressure signal, a pressure sensor for measuring the actual braking pressure in at least one brake of the vehicle controlled by said modulator, and a pressure controller for receiving an actual braking pressure signal from said pressure sensor and for receiving said demanded braking pressure signal from said master controller, said pressure controller including means responsive to said demanded braking pressure signal and to said actual braking pressure signal for varying the magnitude of said control signal.
Dependencies are inferred from the claim text.