Abstract: A deslugging method and system for an agricultural combine, providing several semi- and fully automated operating modes or routines for removing or dislodging a slug of crop and/or other material from the threshing system and/or a feeder of the combine for conveying crop material to the threshing system. The routines can include reciprocating, agitating and jogging routines, which can be automatically altered during execution responsive to sensed or changing conditions, as processed by a suitable filter such as a simplified Kalman type signal filter, for generating a real time estimation and prediction of the various states of the threshing system.

Abstract: A deslugging method and system for an agricultural combine, providing several semi- and fully automated operating modes or routines for removing or dislodging a slug of crop and/or other material from the threshing system and/or a feeder of the combine for conveying crop material to the threshing system. The routines can include reciprocating, agitating and jogging routines, which can be automatically altered during execution responsive to sensed or changing conditions, as processed by a suitable filter such as a simplified Kalman type signal filter, for generating a real time estimation and prediction of the various states of the threshing system.

Abstract: A deslugging method and system for an agricultural combine, providing several semi- and fully automated operating modes or routines for removing or dislodging a slug of crop and/or other material from the threshing system and/or a feeder of the combine for conveying crop material to the threshing system. The routines can include reciprocating, agitating and jogging routines, which can be automatically altered during execution responsive to sensed or changing conditions, as processed by a suitable filter such as a simplified Kalman type signal filter, for generating a real time estimation and prediction of the various states of the threshing system.

Abstract: A deslugging method and system for an agricultural combine, providing several semi- and fully automated operating modes or routines for removing or dislodging a slug of crop and/or other material from the threshing system and/or a feeder of the combine for conveying crop material to the threshing system. The routines can include reciprocating, agitating and jogging routines, which can be automatically altered during execution responsive to sensed or changing conditions, as processed by a suitable filter such as a simplified Kalman type signal filter, for generating a real time estimation and prediction of the various states of the threshing system.

Abstract: An agricultural combine has a variable displacement pump connected to four drive motors that drive four wheels. An electronic controller monitors the speed of each wheel and reduces the torque of the motor that drives the wheel when the wheel slips. The controller reduces the torque by reducing the specific displacement of the slipping motor. Once the wheel has ceased slipping, the controller increases the specific displacement of the motor back to its original displacement.

Abstract: An agricultural combine has a variable displacement pump connected to four drive motors that drive four wheels. An electronic controller monitors the speed of each wheel and reduces the torque of the motor that drives the wheel when the wheel slips. The controller reduces the torque by reducing the specific displacement of the slipping motor. Once the wheel has ceased slipping, the controller increases the specific displacement of the motor back to its original displacement.

Abstract: An agricultural combine has a variable displacement pump connected to four drive motors that drive four wheels. An electronic controller monitors the speed of each wheel and reduces the torque of the motor that drives the wheel when the wheel slips. The controller reduces the torque by reducing the specific displacement of the slipping motor. Once the wheel has ceased slipping, the controller increases the specific displacement of the motor back to its original displacement.

Abstract: An agricultural combine includes a rotor drive system to which sensors are coupled to signal the rotational speed of a hydraulic motor and an engine. An electronic controller that contains a mathematical model of the system reads the sensors and using the model estimates additional parameters of the system. The estimated parameters include a gearbox's gear ratio and a planetary ring gear's speed. These estimated parameters and the sensor readings are used in a PID feedback control loop to control the speed of a planetary ring gear by controlling the speed of a hydraulic motor driving the sun gear. In this manner, the controller can drive the ring gear to a predetermined speed that reduces the difference in the input and output speeds of a hydraulic clutch and thereby engage that clutch while reducing shock to the clutch and other mechanical components of the combine.

Abstract: An agricultural combine includes a rotor drive system to which sensors are coupled to signal the rotational speed of a hydraulic motor and an engine. An electronic controller that contains a mathematical model of the system reads the sensors and using the model estimates additional parameters of the system. The estimated parameters include a gearbox's gear ratio and a planetary ring gear's speed. These estimated parameters and the sensor readings are used in a PID feedback control loop to control the speed of a planetary ring gear by controlling the speed of a hydraulic motor driving the sun gear. In this manner, the controller can drive the ring gear to a predetermined speed that reduces the difference in the input and output speeds of a hydraulic clutch and thereby engage that clutch while reducing shock to the clutch and other mechanical components of the combine.

Abstract: A hydro-mechanical control system for an agricultural combine threshing rotor is operable 1) to transfer torque to the rotor so as to maintain rotor velocity within an acceptable range of a commanded velocity despite small fluctuations in rotor load and engine speed, 2) to reduce wear on mechanical components of the rotor drive system during rotor acceleration, 3) to employ the most efficient combination of mechanical and hydrostatic rotor drive characteristics during steady state operation of the rotor and 4) to reduce the likelihood of engine stall. The system includes a mechanical motor such as an engine, a hydrostatic motor, and a gearset disposed between both motors and the rotor. A clutch is operable to selectively couple the mechanical motor to the gearset, and a brake is selective operable to selectively arrest a driven gear of the gearset from rotation.

Abstract: A hitch control system for a work vehicle combines a front suspension position signal, a hitch load signal and a hitch position signal to generate a valve command signal that controls hitch position so as to alleviate pitching and maximize front wheel ground contact time.

Abstract: An agricultural combine is provided that estimates a hydraulic pressure of a rotor drive system based upon the speeds of the pump (or engine) and motor that drive the rotor. The pressure is estimated by generating a pump displacement control signal in a convention feedback control algorithm and using that signal together with a sensed motor speed signal and a sensed pump speed (proportional to engine speed) to estimate the hydraulic pressure.

Abstract: An agricultural combine is provided with a controller that estimates a hydraulic pressure of a rotor drive system based upon the speeds of the pump (or engine) and motor that drive the rotor. The pressure is estimated by generating a pump displacement control signal in a convention feedback control algorithm and using that signal together with a sensed motor speed signal and a sensed pump speed (proportional to engine speed) to estimate the hydraulic pressure.

Abstract: A hitch control system for a work vehicle combines a front suspension position signal, a hitch load signal and a hitch position signal to generate a valve command signal that controls hitch position so as to alleviate pitching and maximize front wheel ground contact time.

Abstract: A hydro-mechanical control system for an agricultural combine threshing rotor is operable 1) to transfer torque to the rotor so as to maintain rotor velocity within an acceptable range of a commanded velocity despite small fluctuations in rotor load and engine speed, 2) to reduce wear on mechanical components of the rotor drive system during rotor acceleration, 3) to employ the most efficient combination of mechanical and hydrostatic rotor drive characteristics during steady state operation of the rotor and 4) to reduce the likelihood of engine stall. The system includes a mechanical motor such as an engine, a hydrostatic motor, and a gearset disposed between both motors and the rotor. A clutch is operable to selectively couple the mechanical motor to the gearset, and a brake is selective operable to selectively arrest a driven gear of the gearset from rotation.

Abstract: An agricultural combine is provided that estimates a hydraulic pressure of a rotor drive system based upon the speeds of the pump (or engine) and motor that drive the rotor. The pressure is estimated by generating a pump displacement control signal in a convention feedback control algorithm and using that signal together with a sensed motor speed signal and a sensed pump speed (proportional to engine speed) to estimate the hydraulic pressure.

Abstract: An agricultural combine is provided with a controller that estimates a hydraulic pressure of a rotor drive system based upon the speeds of the pump (or engine) and motor that drive the rotor. The pressure is estimated by generating a pump displacement control signal in a convention feedback control algorithm and using that signal together with a sensed motor speed signal and a sensed pump speed (proportional to engine speed) to estimate the hydraulic pressure.

Abstract: An agricultural combine includes a rotor drive system to which sensors are coupled to signal the rotational speed of a hydraulic motor and an engine. An electronic controller that contains a mathematical model of the system reads the sensors and using the model estimates additional parameters of the system. The estimated parameters include a gearbox's gear ratio and a planetary ring gear's speed. These estimated parameters and the sensor readings are used in a PID feedback control loop to control the speed of a planetary ring gear by controlling the speed of a hydraulic motor driving the sun gear. In this manner, the controller can drive the ring gear to a predetermined speed that reduces the difference in the input and output speeds of a hydraulic clutch and thereby engage that clutch while reducing shock to the clutch and other mechanical components of the combine.

Abstract: A servo system having a circuit for developing an error signal representing the deviation of a load condition from a desired condition represented by a command signal and forward and feedback paths at least one of which includes an impedance therein represented by a transfer function comprises a limiter receiving the command signal and connected to the error signal developing circuit for controllably limiting the command signal wherein the limiter has a variable saturation point and a circuit coupled to the limiter and to the impedance for controlling the saturation point of the limiter in accordance with the transfer function of the impedance to enable fast response without damage to an output device controlled by the servo system.

Abstract: A level detector includes first and second comparators each having two inputs and an output wherein the first comparator receives an input signal and a first reference signal at the two inputs thereof and develops a first comparison signal when the input signal level is greater than the first reference signal level and wherein the second comparator receives the input signal and a second reference signal at the two inputs thereof and develops a second comparison signal when the input signal is less than the second reference signal level. A flip-flop includes first and second inputs coupled to the outputs of the first and second comparators, respectively. The flip-flop develops a high state signal when the first comparator develops the first output signal and develops a low state signal when the second comparator develops the second output signal.