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US 12,504,069 B2Granted
Gear shifting process for powertrain transmission
AssigneeCaterpillar Inc.
InventorsBrian E. Lister, Bernard M. Murphy
Life of this patent
Estimating the term…
Abstract
A transmission associated with a powertrain receives torque from a power source and includes a plurality of gear sets that can be selectively engaged and released. To shift gear sets, a shifting process conducted by an electronic controller may estimate a torque assist capacity of the power source to provide or accommodate changes in torque during the gear shift. If the torque assist capacity is less than a gear shift torque value, the shifting process prevents or ignores the gear shift.
Claims20
A method of operating a transmission in a powertrain comprising:
- detecting a gear shift occurring with the transmission;
- estimating a torque assist capacity associated with a power source connected to direct torque to the transmission;
- determining a gear shift torque value associated with the gear shift as detected;
- comparing the torque assist capacity with the gear shift torque value;
- and
- conducting the gear shift if the torque assist capacity complies with the gear shift torque value.
3 more elements
A powertrain for a mobile machine comprising:
- a transmission including a plurality of gear sets each associated with a clutch for selective engagement and release from engagement in response to a gear shift;
- a power source directing torque to the transmission;
- an electronic controller configured to detect the gear shift, estimate a torque assist capacity of the power source, determine a gear shift torque value, and compare the torque assist capacity and gear shift torque value in order to conduct the gear shift.
Dependencies are inferred from the claim text.