Abstract: A predictive load management system is provided. A power source is operable to generate a power output and has a desired operating range. A transmission has a drive member operably engaged with the power source and a driven member. A control system is operable to receive at least one input indicative of a load on the transmission and to identify a desired load of the transmission based on the at least one input. The control system is also operable to receive at least one input indicative of current power output of the power source. The control system limits the desired transmission load applied to the driven member of the transmission based on the current power output of the power source to thereby prevent the power source from operating outside of the desired operating range.

Abstract: A method of conditioning a signal being communicated between a system to be controlled and a controller may include monitoring an actual output signal and conditioning the actual output signal. The method also includes determining the difference between the actual output signal and the condition signal and causing the actual output signal to be filtered based on the relationship between the difference between the actual output signal and the conditioned signal.

Abstract: A system for controlling intake pressure of a combustion engine operably coupled to a power generation system includes a sensor configured to output a signal indicative of a pressure in an intake system of the combustion engine and a sensor configured to output a signal indicative of a load on the power generation system. The system further includes a turbocharger operably coupled to the intake system. The system also includes an electric machine operably coupled to the turbocharger. The electric machine is configured to supply torque to the turbocharger. The system further includes a turbocharger controller operably coupled to the electric machine. The turbocharger controller is configured to control operation of the electric machine such that the turbocharger supplies a desired intake pressure to the combustion engine based at least partially on the signal indicative of a pressure in the intake system and the signal indicative of a load on the power generation system.

Abstract: A method of dissipating power in a propelled machine having an electric drive includes converting undesired power to electric power by the electric drive, and driving an internal combustion engine with at least a portion of the electric power prior to substantially dissipating power with any other power dissipating device.

Abstract: A predictive load management system includes a power source operable to generate power output, the power source having a desired operating range. A transmission having a drive member is operably engaged with the power source. A control system is in communication with the power source and the transmission. The control system receives at least one input indicative of a load on the transmission and identifies a change in the load on the transmission based on the at least one input. The control system is further operable to determine a desired power output of the power source to account for the change in the load on the transmission. The control system modifies a performance characteristic of the power source to cause the power source to generate the desired power output when the change in the load on the transmission will result in the power source operating outside of the desired operating range.

Abstract: A method of conditioning a signal being communicated between a system to be controlled and a controller may include monitoring an actual output signal and conditioning the actual output signal. The method also includes determining the difference between the actual output signal and the condition signal and causing the actual output signal to be filtered based on the relationship between the difference between the actual output signal and the conditioned signal.

Abstract: A method of controlling a motor may include controllably operating a motor with a desired input command to attain a desired output response of the motor, monitoring an output of the motor, and determining a difference between the monitored output and the desired input command. The method may further include establishing a deadband around the difference and determining a torque command based on a relationship between the difference and the deadband.

Abstract: A transmission assembly having a variable displacement hydraulic device which controls a ratio of an input speed to an output speed of the hydrostatic transmission is disclosed. The transmission assembly further includes a torque reversing mechanical transmission coupled to the hydrostatic transmission and having a first range and a second range. The transmission assembly further includes an output shaft driven by one or more of the hydrostatic transmission and the mechanical transmission which causes a work machine to move at a travel speed and a controller. The controller is operable to determine a transmission load and an equal displacement travel speed ratio based on the transmission load. A shift from the first gear range to the second gear range is based on the equal displacement travel speed ratio. A method of operating a transmission assembly is also disclosed.

Abstract: An apparatus for controlling a continuously variable transmission includes an input shaft driven by an engine, an output shaft, an operator input for generating speed commands and a controller operable to receive the speed commands and generate transmission ratio commands which control a ratio of a speed of the output shaft to a speed of the input shaft. Torque of the output shaft is limited in a torque limited region near zero speed of the output shaft and the transmission ratio command is modified in the torque limited region.

Abstract: A transmission assembly is disclosed. The transmission assembly includes a continuously variable transmission driven by an input shaft at an input speed, a mechanical transmission coupled to the continuously variable transmission for selecting a first gear range and a second gear range, an output shaft driven by the mechanical transmission at an output speed, and controller operable to receive a speed command and generate a transmission ratio is command which control a ratio of the output speed to the input speed, and generate a shift command which causes the mechanical transmission to shift from the first gear range to the second gear range. An upper transmission ratio limit defined by an engine lug limit. A lower transmission ratio limit is defined by an engine overspeed limit. The controller causes the transmission to execute a shift from the first gear range to the second gear range which causes an instantaneous change in output speed.

Abstract: A transmission assembly driven by an engine is disclosed. The transmission assembly includes a hydrostatic transmission having a variable displacement hydraulic pump and a hydraulic motor, a mechanical transmission coupled to the hydrostatic transmission for selecting a first gear range and a second gear range, and a controller for receiving operator inputs and generating a displacement command operable to control a displacement of the variable displacement pump. The controller determines the actual displacement. The controller determines a displacement shift level from the actual displacement. The controller executes a shift from the first gear range to the second gear range when the actual displacement reaches displacement shift level. A method of controlling a transmission assembly is also disclosed.

Abstract: A transmission assembly having a continuously variable transmission, a mechanical transmission coupled to the continuously variable transmission for selecting a first gear range and a second gear range, and a controller for receiving operator inputs and generating commands operable to control an output of the continuously variable transmission is disclosed. The controller executes a first shift between the first gear range and the second gear range at a shift point in response to the commands. The controller places the transmission in a first mode of operation whereby a second shift from the second gear range to the first gear range is inhibited. The controller places the transmission in a second mode of operation where the second shift from the second gear range to the first gear range is allowed when the output progresses beyond the shift point by a first value or the command falls past the shift point by a second value.

Abstract: An apparatus for controlling load on an engine is disclosed. The apparatus includes a continuously variable transmission driven by the engine. The apparatus further includes an engine speed sensor being adapted to sense the output speed of the engine and produce an engine speed signal indicative of the engine output speed and a travel speed sensor being adapted to sense the travel speed of the machine and produce a travel speed signal indicative of the machine travel speed. The apparatus yet further includes an electronic controller operable to compare the engine speed signal to an underspeed value and produce an integral error signal indicative of the difference between the engine speed signal and the underspeed value, supply an integral gain value based on the machine travel speed, modify the integral error signal through a proportional plus integral feedback controller to produce an underspeed request signal, and produce a command signal based on the underspeed request signal.

Abstract: A transmission assembly includes a variable displacement hydraulic pump, a hydraulic motor operatively connected to the pump, a speed sensor operable to sense the speed of an output shaft of the motor, a first actuator for setting displacement of the pump in a positive displacement range in response to a first actuator command and a second actuator for setting displacement of the pump in a negative displacement range in response to a second actuator command. A controller is operable to transmit first actuator commands to the first actuator and transmit second actuator commands to the second actuator in response to operator inputs. The operator inputs require that the displacement of the pump to move from the positive displacement range to the negative displacement range. The controller generates first actuator commands which cause the first actuator to set the displacement to zero.

Abstract: A transmission assembly having a hydrostatic transmission with a variable displacement hydraulic device which controls a motor speed ratio. The transmission assembly further includes a mechanical transmission coupled to the hydrostatic transmission and having a first range and a second range and an output shaft driven at a travel speed ratio. The torque through the hydrostatic transmission reverses when the mechanical transmission shifts from the first range to the second range. A synchronous travel speed ratio is the motor speed ratio which produces the same travel speed ratio in both the first gear range and the second gear range. An equal displacement travel speed ratio is the travel speed ratio at which a displacement of the variable displacement device in the second gear range is the same as the displacement in the first gear range. A travel speed ratio differential is a difference between the synchronous speed ratio and the equal displacement travel speed ratio.

Abstract: A transmission includes a transmission input speed sensor which generates transmission input speed signals indicative of an input speed to the transmission and a transmission output speed sensor which generates transmission output speed signals indicative of an output speed of the transmission. The transmission further includes a controller operable to receive the transmission input speed signal and the transmission output speed signal and determine a transmission ratio based on the transmission input speed signal and the transmission output speed signal. The controller is further operable to calculate a rate of change of the transmission ratio and initiate a transmission range shift based on the transmission ratio, the rate, and a shift completion ratio such that the transmission range shift is completed when the transmission is at the predetermined shift completion ratio.

Abstract: A transmission assembly having a hydrostatic transmission with a variable displacement hydraulic device which controls a motor speed ratio. The transmission assembly further includes a mechanical transmission coupled to the hydrostatic transmission and having a first range and a second range and an output shaft driven at a travel speed ratio. The torque through the hydrostatic transmission reverses when the mechanical transmission shifts from the first range to the second range. A synchronous travel speed ratio is the motor speed ratio which produces the same travel speed ratio in both the first gear range and the second gear range. An equal displacement travel speed ratio is the travel speed ratio at which a displacement of the variable displacement device in the second gear range is the same as the displacement in the first gear range. A travel speed ratio differential is a difference between the synchronous speed ratio and the equal displacement travel speed ratio.

Abstract: A control apparatus for a continuously variable transmission is disclosed. The control apparatus includes a transmission speed sensor which generates an actual velocity signal in response measuring speed of an output shaft of the continuously variable transmission. The control apparatus further includes a first input device, or speed pedal, which is positionable in one of an infinite number of positions and generates a desired velocity signal corresponding to the position of the speed pedal. The control apparatus yet further includes a controller operable to receive the desired velocity signal, receive the actual velocity signal, calculate a commanded acceleration ac, and generate a commanded velocity Vc based on the desired velocity signal, a jerk value j, and the commanded acceleration ac. A method of controlling a continuously variable transmission is also disclosed.

Abstract: A control apparatus for a continuously variable transmission is disclosed. The control apparatus includes a transmission speed sensor which generates actual velocity signals in response measuring a speed of an output shaft of the continuously variable transmission. The control apparatus further includes a first input device which is positionable in one of a number of positions and generates a desired velocity signal corresponding to the one of the number of positions. The control apparatus yet further includes a controller operable to receive the desired velocity signals, receive the actual velocity signals, determine when rapid changes in the desired velocity are requested by an operator, and generate a commanded acceleration and a commanded velocity based on a jerk value which exceeds a predetermined jerk limit in response to the rapid changes in the desired velocity. A method of controlling a continuously variable transmission is also disclosed.

Abstract: A system and process for providing different levels of jerk in response to speed pedal displacement in a machine including a speed pedal having a range of displacement, a continuously variable transmission, a mechanism for measuring output speed of the continuously variable transmission, and an electronic controller for generating a jerk command signal that is in a one-to-one correspondence with the displacement of the speed pedal and shaping the jerk command signal into a velocity profile command that is applied to the continuously variable transmission and then comparing the output speed of the continuously variable transmission with the velocity profile command for controlling the continuously variable transmission.