Method for Operating an Automatic Transmission
AssigneeZF Friedrichshafen AG
InventorsChristoph Hess, Philipp Kölbl, Ruben Cueppers
Life of this patent
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Abstract
A method for operating an automatic transmission is provided. The method includes disengaging a shifting element of the automatic transmission and measuring an input speed of the automatic transmission while the shifting element is disengaging. A command pressure of the shifting element is adjusted to a target command pressure based at least in part on the input speed of the automatic transmission while the shifting element is disengaging.
Claims19
A method for operating an automatic transmission, comprising:
- adjusting a shift lever to a neutral position or a park position;
- commanding a shifting element of the automatic transmission to actuate from an engaged configuration to a disengaged configuration;
- measuring an input speed of the automatic transmission;
- establishing a launch time for a turbine of a torque converter of the automatic transmission based at least in part on when the input speed of the automatic transmission exceeds zero at said step of measuring;
- and
- changing a command pressure to the shifting element of the automatic transmission based at least in part on the launch time for the turbine of the torque converter from said step of establishing.
A method for operating an automatic transmission, comprising:
- disengaging a shifting element of the automatic transmission after a shift lever is adjusted to a neutral position or a park position;
- measuring a turbine speed of a torque converter of the automatic transmission during said step of disengaging;
- and
- adjusting a command pressure supplied to the shifting element of the automatic transmission based at least in part on a launch time of a turbine of the torque converter, the launch time corresponding to a time when the turbine speed exceeds zero during said step of measuring.
A method for operating an automatic transmission, comprising:
- adjusting a shift lever to a neutral position or a park position;
- actuating a shifting element of the automatic transmission from an engaged configuration to a disengaged configuration after said step of adjusting;
- measuring an input speed of the automatic transmission;
- and
- step for adjusting a command pressure of the shifting element to a target command pressure based at least in part on the input speed of the automatic transmission.
Dependencies are inferred from the claim text.