Patent ID: 8849535

Claim:
A brake valve monitoring system for a machine, the brake valve monitoring system comprising: a brake valve for creating brake pressure in a braking system of the machine; a braking device for providing braking signals indicating a desired brake pressure to be applied by the braking system of the machine; and a control unit that monitors changes in braking performance, the control unit operatively connected to the brake valve and the braking device, the control unit configured to receive the braking signals from the braking device and to output brake command current to cause the brake valve to create a commanded brake pressure in the braking system, the control unit configured to determine an actual brake output pressure in the braking system, the control unit configured to determine an acceptable brake pressure range based on the brake command current, the control unit configured to determine whether the actual brake output pressure is within the acceptable brake pressure range, the control unit configured to determine a weighted brake pressure difference in response to determining that the actual brake output pressure is not within the acceptable brake pressure range, wherein the weighted brake pressure difference is determined based on a difference between the actual brake output pressure and a corresponding end of the acceptable brake pressure range, the control unit configured to add the weighted brake pressure difference to a cumulative integration value for a brake pressure difference, the control unit configured to compare the cumulative integration value to an integration limit for the brake pressure difference, and the control unit configured to execute a response strategy in response to determining that the cumulative integration value is greater than the integration limit.