Surface compactor and method of operating a surface compactor

Abstract

A method of operating a surface compactor is provided. The method may include supporting a base of the surface compactor on a surface. The method may also include generating a fluctuating vertical force on the base with a vibratory mechanism, which may include moving one or more weights of the vibratory mechanism with a drive system of the vibratory mechanism. Additionally, the method may include sensing a parameter of the operation of the vibratory mechanism that fluctuates in reaction to moving the one or more weights to generate the fluctuating vertical force. The method may also include automatically adjusting the operation of the vibratory mechanism to adjust the fluctuating vertical force based at least in part on the sensed parameter.

1 . A method of operating a surface compactor, comprising:
 supporting a base of the surface compactor on a surface;   generating a fluctuating vertical force on the base with a vibratory mechanism, including moving one or more at least two weights of the vibratory mechanism with drive system of the vibratory mechanism;   sensing a parameter of the operation of the vibratory mechanism that fluctuates in reaction to moving the one or more weights to generate the fluctuating vertical force; and   automatically adjusting the operation of the vibratory mechanism by moving at least two weights of the vibratory mechanism relative to one another to adjust the fluctuating vertical force based at least in part on the sensed parameter.   
     
     
         2 . The method of  claim 1 , wherein automatically adjusting the operation of the vibratory mechanism to adjust the fluctuating vertical force based at least in part on the sensed parameter includes adjusting the operation of the vibratory mechanism to reduce the amplitude of the fluctuating vertical force in response to the amplitude of the sensed parameter exceeding a reference value. 
     
     
         3 . The method of  claim 2 , wherein the reference value substantially corresponds to an amplitude of the sensed parameter that occurs when the amplitude of the fluctuating vertical force becomes large enough to cause the base to separate from the surface. 
     
     
         4 . The method of  claim 1 , wherein sensing a parameter of the operation of the vibratory mechanism that fluctuates in reaction to moving the one or more weights to generate the fluctuating vertical force includes sensing a load in the vibratory mechanism. 
     
     
         5 . The method of  claim 1 , wherein:
 the drive system includes an actuator for adjusting the relative position of the weights; and   sensing a parameter of the operation of the vibratory mechanism that fluctuates in reaction to moving the one or more weights to generate the fluctuating vertical force includes sensing a parameter of the operation of load on the actuator.   
     
     
         6 . The method of  claim 1 , wherein:
 the base includes a roller; and   the method further includes rolling the roller across the surface.   
     
     
         7 . The method of  claim 1 , wherein:
 the drive system includes a fluid-operated actuator for adjusting the relative position of the weights; and   sensing a parameter of the operation of the drive system includes sensing pressure in the operating fluid for the actuator.   
     
     
         8 . The method of  claim 1 , wherein automatically adjusting the
 operation of the vibratory mechanism to adjust the fluctuating vertical force based at least in part on the sensed parameter includes automatically adjusting the operation of the vibratory mechanism to adjust the amplitude of the fluctuating vertical force based at least in part on a relationship between a first frequency component of the sensed parameter and a second frequency component of the sensed parameter.   
     
     
         9 . The method of  claim 8 , wherein:
 the first frequency component is the fluctuation in the sensed parameter at the frequency of the fluctuating vertical force; and   the second frequency component is the fluctuation in the sensed parameter at half the frequency of the fluctuating vertical force.   
     
     
         10 . A surface compactor, comprising:
 a base;   a vibratory mechanism, including a drive system that moves one or more at least two weights in a manner that generates a fluctuating vertical force on the base, the drive system including an actuator to move the weights relative to one another to change a net centrifugal force generated by the weights as the weights rotate;   a control system that senses a load in the surface compactor that fluctuates in reaction to the drive system moving the one or more weights and generating the fluctuating vertical force, wherein the control system adjusts the operation of the vibratory mechanism to adjust the fluctuating vertical force based at least in part on the sensed load.   
     
     
         11 . The surface compactor of  claim 10 , wherein the control system includes a sensor adapted to sense the load in the surface compactor, the load being in the vibratory mechanism. 
     
     
         12 . A surface compactor, comprising:
 a base;   a vibratory mechanism, including a drive system that moves at least two weights in a manner that generates a fluctuating vertical force on the base, the drive system including an actuator to move the weights relative to one another to change a net centrifugal force generated by the weights as the weights rotate; and   a control system that senses a load in the surface compactor that fluctuates in reaction to the drive system moving the one or more weights and generating the fluctuating vertical force, wherein the control system adjusts the operation of the vibratory mechanism to adjust the fluctuating vertical force based at least in part on the sensed load, wherein the control system includes a sensor adapted to sense the load in the surface compactor, the load being on an actuator.   
     
     
         13 . The surface compactor of  claim 12 , wherein:
 the actuator is a fluid-operated actuator; and   the sensor is a pressure sensor adapted to sense pressure in the operating fluid for the actuator.   
     
     
         14 . The surface compactor of  claim 12 , wherein the actuator is part of the vibratory mechanism. 
     
     
         15 . The surface compactor of  claim 10 , wherein the control system is adapted to adjust the vibratory mechanism to reduce the amplitude of the fluctuating vertical force in response to an amplitude of the sensed load exceeding reference value. 
     
     
         16 . The surface compactor of  claim 15 , wherein the reference value substantially corresponds to an amplitude of the sensed load that occurs when the amplitude of the fluctuating vertical force becomes large enough to cause the base to separate from an underlying surface. 
     
     
         17 . A method of operating a surface compactor, the method comprising:
 supporting a base of the surface compactor on a surface;   generating a fluctuating vertical force on the base with a vibratory mechanism, including moving one or more weights of the vibratory mechanism with a drive system of the vibratory mechanism;   sensing a load on an actuator of the drive system of the vibratory mechanism; and   adjusting the operation of the vibratory mechanism to reduce the magnitude of the fluctuating vertical force in response to the sensed load fluctuating by an amount greater than a reference value.   
     
     
         18 . The method of  claim 17 , wherein adjusting the operation of the vibratory mechanism to reduce the magnitude of the fluctuating vertical force includes activating the actuator to adjust the relative position between two or more components of the vibratory mechanism. 
     
     
         19 . The method of  claim 17 , wherein:
 the actuator is a fluid-operated actuator; and   sensing a load on the actuator includes sensing pressure in the operating fluid for the actuator.   
     
     
         20 . The method of  claim 17 , wherein the reference value substantially corresponds to an amplitude of fluctuation in the sensed load that occurs when the amplitude of the fluctuating vertical force becomes large enough to cause the base to separate from the surface.