Caterpillar Inc.

Christopher Rhoades

Michael David Beyer

Brian Eugene Lister

Adam Vaccari

Jason J Stoller

Adam Martin Nackers

Chad Timothy Brickner

Michael John Barngrover

Mike Barngrover

A transmission includes a transmission output speed (TOS) sensor providing a signal indicative of an output speed of the transmission. A controller estimates an actual torque output of the transmission and determines, in real time, a first TOS acceleration based on the signal provided by the transmission output speed sensor and a second TOS acceleration based on the actual torque estimation. The first and second accelerations are compared and a torque transient trigger is activated when the divergence exceeds a threshold value.

System and method for machine load detection

A method of controlling a transmission () for a machine is disclosed. The transmission includes a variator (). The transmission is operated in a first operating range (). It is determined whether a current speed ratio is within a first predetermined range of a speed ratio associated with a first synchronous point () lying between the first operating range () and the second operating range (). A desired speed ratio is determined and it is determined if the desired speed ratio is within a second predetermined range of the speed ratio. A shift between the first and second operating ranges () is prevented and the variator () is controlled to hold the current speed ratio if the desired speed ratio is within the second predetermined range or the rate of acceleration of the machine is below the threshold acceleration.

System and method for controlling shift hunting in variable transmissions

A powertrain includes an engine, a transmission having a first input connected to an engine output shaft, and a variator. The variator includes a pump connected to the engine output shaft and a motor connected to a second input of the transmission. The pump has a variable setting that is determinable by a position of a pump actuator in response to a command signal. A controller associated is disposed to control operation of the variator, at least in part, by providing the command signal to the pump actuator. The command signal is determined based on an operator command and on a compensation term, which depends on a correlation function of a parameter related to the speed ratio between a pump speed and a motor speed and a flow characteristic of the pump actuator.

Variable transmission and method

A method for preventing shift hunting in a powertrain including an engine and a transmission having a variator, a first gearset, and a second gearset is disclosed. The method includes operating the engine at a first substantially constant speed, detecting a shift condition, and operating the engine at a second substantially constant speed as a function of detecting the shift condition. The second speed is different than the first speed.

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Metamora, IL, United States of America

Christopher Rhoades