Active ride control on construction vehicles

Abstract

A hydraulic system including a pump, a flow director in hydraulic communication with the pump outlet and configured to adjust a flow of hydraulic fluid between one or more hydraulic components, a hydraulic actuator, a load sensor configured to receive an indication of the pressure exerted on the hydraulic actuator and transmit the indication of the pressure exerted on the hydraulic actuator to the pump to adjust a hydraulic displacement of the pump. The hydraulic system also includes a control system including processing circuitry configured to receive a desired angle of the work implement, a command to reduce oscillations of a work vehicle, and transmit a signal to the flow director to adjust a flow of hydraulic fluid from the pump outlet to both the first chamber and the second chamber of the hydraulic actuator.

1 . A work vehicle comprising:
 one or more user input devices;   a work implement;   a hydraulic system comprising;
 a pump configured to cause a differential in hydraulic pressure between a pump inlet and a pump outlet; 
 a flow director in hydraulic communication with the pump outlet and configured to adjust a flow of hydraulic fluid between one or more hydraulic components; 
 a hydraulic actuator comprising a first chamber and a second chamber and configured to adjust a position of the work implement; and 
 an angle sensor configured to receive a signal associated with an angle of the work implement; 
   a load sensor configured to;
 receive an indication of the pressure exerted on the hydraulic actuator; and 
 transmit the indication of the pressure exerted on the hydraulic actuator to the pump to adjust a hydraulic displacement of the pump; and 
   a control system comprising processing circuitry and configured to:
 receive, by a processor from the one or more user input devices, a desired angle of the work implement; 
 receive, by the processor from the one or more user input devices, a command to reduce oscillations of the work vehicle; and 
 transmit a control signal, by the processor, to the flow director to adjust the flow of hydraulic fluid from the pump outlet to both the first chamber and the second chamber of the hydraulic actuator. 
   
     
     
         2 . The work vehicle of  claim 1 , wherein the flow director is an independent metering valve configured to independently control the flow of hydraulic fluid from the pump outlet to both the first chamber and the second chamber of the hydraulic actuator. 
     
     
         3 . The work vehicle of  claim 1 , wherein the hydraulic actuator is a hydraulic piston and cylinder, wherein the cylinder is rotatably coupled to the work implement and the hydraulic piston is rotatably coupled to the work vehicle. 
     
     
         4 . The work vehicle of  claim 1 , wherein the hydraulic system does not comprise an accumulator or a dissipating valve. 
     
     
         5 . The work vehicle of  claim 1 , wherein the work implement is a boom. 
     
     
         6 . The work vehicle of  claim 1 , wherein the load sensor is a load sensing hydraulic circuit. 
     
     
         7 . The work vehicle of  claim 1 , wherein the load sensor is an electronic circuit comprising a pressure sensor configured to receive the signal associated with the pressure at the hydraulic actuator. 
     
     
         8 . A method for reducing oscillations in a work vehicle, the method comprising:
 receiving, by a load sensor circuit, an indication of a pressure exerted on a hydraulic actuator;   transmitting, by the load sensor circuit, the indication of the pressure exerted on the hydraulic actuator to a pump to adjust a hydraulic displacement of the pump;   receiving, by a processor, from one or more user input devices, a desired angle of a work implement coupled to the hydraulic actuator;   receiving, by the processor from the one or more user input devices, a command to reduce oscillations of the work vehicle; and   transmitting a signal, by the processor, to a flow director to adjust a flow of hydraulic fluid from a pump outlet to both a first chamber and a second chamber of the hydraulic actuator.   
     
     
         9 . The method of  claim 8 , wherein the flow director is an independent metering valve configured to independently control the flow of hydraulic fluid from the pump outlet to both the first chamber and the second chamber of the hydraulic actuator. 
     
     
         10 . The method of  claim 8 , wherein the hydraulic actuator is a hydraulic piston and cylinder, the cylinder is rotatably coupled to the work vehicle and the hydraulic piston is rotatably coupled to the work vehicle. 
     
     
         11 . The method of  claim 8 , wherein the command to reduce the oscillations of the work vehicle is associated with an engageable driving mode. 
     
     
         12 . The method of  claim 8 , wherein the load sensor circuit is a load sensing hydraulic circuit. 
     
     
         13 . The method of  claim 8 , wherein the load sensor circuit is an electronic circuit comprising a pressure sensor configured to receive the signal associated with the pressure at the hydraulic actuator. 
     
     
         14 . A hydraulic system comprising;
 a pump configured to cause a differential in hydraulic pressure between a pump inlet and a pump outlet;   a flow director in hydraulic communication with the pump outlet and configured to adjust a flow of hydraulic fluid between one or more hydraulic components;   a hydraulic actuator comprising a first chamber and a second chamber and configured to adjust a position of a work implement; and   an angle sensor configured to receive a signal associated with an angle of the work implement;   a load sensor configured to;
 receive an indication of the pressure exerted on the hydraulic actuator; and 
 transmit the indication of the pressure exerted on the hydraulic actuator to the pump to adjust a hydraulic displacement of the pump; and 
   a control system comprising processing circuitry and configured to:
 receive, by a processor from one or more user input devices, a desired angle of the work implement; 
 receive, by the processor from the one or more user input devices, a command to reduce oscillations of a work vehicle; and 
 transmit a control signal, by the processor, to the flow director to adjust the flow of hydraulic fluid from the pump outlet to both the first chamber and the second chamber of the hydraulic actuator. 
   
     
     
         15 . The hydraulic system of  claim 14 , wherein the flow director is an independent metering valve configured to independently control the flow of hydraulic fluid from the pump outlet to both the first chamber and the second chamber of the hydraulic actuator. 
     
     
         16 . The hydraulic system of  claim 14 , wherein the hydraulic actuator is a hydraulic piston and cylinder, the cylinder is rotatably coupled to the work vehicle and the hydraulic piston is rotatably coupled to the work vehicle. 
     
     
         17 . The hydraulic system of  claim 14 , wherein the hydraulic system does not comprise an accumulator or a dissipating valve. 
     
     
         18 . The hydraulic system of  claim 14 , wherein the command to reduce the oscillations of the work vehicle is associated with an engageable driving mode. 
     
     
         19 . The hydraulic system of  claim 14 , wherein the load sensor is a load sensing hydraulic circuit. 
     
     
         20 . The hydraulic system of  claim 14 , wherein the load sensor is an electronic circuit comprising a pressure sensor configured to receive the signal associated with the pressure at the hydraulic actuator.