Method for actuating a starting process
AssigneeZF Friedrichshafen AG
InventorsKai Borntrager, Johannes Kaltenbach
Life of this patent
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Abstract
A method of actuating a starting process, in a selected driving direction, of a vehicle having a hybrid drive system and a hydraulically controlled transmission. When starting, the method checks whether the vehicle is moving in the selected direction, and if the vehicle is moving in the opposite direction, at least the shifting element (A, B, D, E, F) of the transmission that is involved in the engaged gear is actuated in such a manner that a continuous torque increase is produced by the electric machine (EM).
Claims9
A method of controlling a starting process, in a selected driving direction, of a vehicle having a hybrid drive system and a hydraulically controlled transmission, the method comprising the steps of:
- checking whether the vehicle, upon starting the vehicle in the selected driving direction, is moving in the selected driving direction, and
- if the vehicle is moving in an opposite direction that is opposite the selected driving direction, actuating at least one of a plurality of shifting elements (A, B, D, E, F) of the transmission, that are involved in an engaged gear, in such a manner that a continuous torque increase is produced by an electric machine (EM) and such that a torque transmission capacity of the at least one of the plurality of shifting elements, that are involved in the engaged gear, is reduced.
A method of controlling a starting process, in a selected driving direction, of a vehicle having a hybrid drive system and a hydraulically controlled transmission, the method comprising the steps of:
- checking whether the vehicle, upon starting tide vehicle in the selected driving direction, is moving in selected direction, and
- if the vehicle is moving in an opposite direction, actuating at least one of a plurality of shifting elements (A, B, D, E, F) of the transmission, that are involved in an engaged gear, in such a manner that a continuous torque increase is produced by a electric machine (EM):
- setting the at least one of the plurality of shifting elements (A, B, D, E, F) involved so as to have a predetermined slipping torque such that a value of the slipping torque chosen is smaller than a maximum possible torque of the electric machine (EM);
- and
- switching the electric machine (EM) to a rotational speed mode after a specific slipping torque has been set.
A method of controlling starting of a vehicle in a selected driving direction having a hybrid drive system and a hydraulically controlled transmission, the method comprising the steps of:
- starting driving in a selected driving direction by engaging a desired gear by actuation of at least one transmission shifting element;
- determining if the vehicle is moving in the selected driving direction, and
- if the vehicle is moving in a direction opposite the selected driving direction, setting a slipping torque at the at least one transmission shifting element (A, B, D, E, F) to reduce torque transmission capacity of the at least one transmission shifting element such that a continuous torque increase is produced by an electric machine (EM) of the hybrid drive system.
Dependencies are inferred from the claim text.