Patent ID: 7278262
Filing Date: 2007-10-09
Classification: E02F,F15B

Abstract:
1. A working apparatus comprising: a first source configured to provide pressurized hydraulic fluid; an operator control unit; a boom arm; a boom cylinder configured to be coupled to the boom arm, the cylinder having a first chamber and a second chamber; a main control valve configured to direct the pressurized hydraulic fluid from the first source to the first and second chambers in response to manipulation of the operator control unit to selectively raise and lower the arm; a first pressure sensor and a second pressure sensor operable to detect hydraulic pressure in the first and second chambers, respectively, and generate a signal in reference to the amount of hydraulic pressure in the first and second chambers, respectively; a controller valve operable in a parallel configuration with the operator control unit to override the operation of the control unit and manipulate the main control valve; and a controller operable to receive the signals from the pressure sensors, process the signals to predict boom oscillations, and control the controller valve to operate the main control valve and help prevent the predicted boom oscillations.