HYDRAULIC ACCUMULATOR PRE-CHARGE PRESSURE DETECTION FOR HYDRAULIC BRAKING SYSTEM

摘要

A system and method for detecting a pre-charge pressure of a hydraulic braking system are disclosed. A controller receives pressure readings from a pressure sensor indicative of the pressure of a hydraulic brake accumulator or the lower pressure of more than one accumulator. In response to fluid being provided to the hydraulic accumulator, the controller determines a first rate of pressure change, a second rate of pressure change different than the first rate, and a transition pressure between the first and second rates. The controller determines an approximate pre-charge pressure of the hydraulic brake accumulator based on the transition pressure. A warning can be provided to the operator or another when the determined pre-charge pressure is lower than a reference pressure.

主权项

1. A hydraulic braking system comprising:
one or more hydraulic brake accumulators capable of an associated pre-charge pressure, the hydraulic brake accumulator to discharge pressurized fluid to a hydraulic brake; a pressure sensor fluidly coupled to the hydraulic brake accumulator; a pump to provide fluid to the hydraulic brake accumulator during a charge cycle; and a controller configured to receive pressure readings from the pressure sensor indicative of the pressure of the hydraulic brake accumulator, the controller configured to: in response to fluid being provided to the hydraulic accumulator, determine a first rate of pressure change, a second rate of pressure change different than the first rate, and a pressure at a transition between the first and second rates; and determine a pre-charge pressure of the hydraulic brake accumulator based on said pressure at the transition.