Patent ID: 6243639
Filing Date: 2001-06-05
Classification: B60T

Abstract:
A method for estimating pressure changes within a hydraulic system having a first reservoir and at least one second reservoir connected to the first reservoir via a valve, comprising the steps of:(a) specifying a pressure differential between the first and second reservoirs;(b) calculating a value of a volume exchanged between the first and second reservoirs via the valve within a specified time interval, the value of the volume exchanged being calculated as a function of a value for the pressure differential that is valid at a start of the specified time interval;(c) calculating a value of a volume to be exchanged between the first and second reservoirs in order to achieve equal pressures in the first and second reservoirs;(d) if the value of the volume exchanged calculated in step (b) is greater than the value of the volume to be exchanged as calculated in step (c), replacing the value of the volume exchanged with the value of the volume to be exchanged; and(e) adopting the replaced value of the volume exchanged as a change in a volume in the second reservoir and determining a pressure change in the first and second reservoirs using the replaced value of the volume exchanged.