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Friedrichshafen, Germany

ZF Friedrichshafen AG, also known as ZF Group, and commonly abbreviated to ZF , is a German car parts maker headquartered in Friedrichshafen, in the south-west German region of Baden-Württemberg.Specialising in engineering, it is primarily known for its design, research and development, and manufacturing activities in the automotive industry. It is a worldwide supplier of driveline and chassis technology for cars and commercial vehicles, along with specialist plant equipment such as construction equipment. It is also involved in rail, marine, defence and aviation industries, as well as general industrial applications. ZF has 121 production locations in 27 countries with approximately 71,500 employees. Wikipedia.


Patent
ZF Friedrichshafen AG | Date: 2015-04-13

A method for rocking a motor vehicle free. The vehicle has a drive-train with an automatic drive torque adjusting element, which transmits torque to a wheel, and a rotational speed and direction sensor system for detecting movement of the vehicle such that when the accelerator pedal is biased to a position different from its non-actuated position a desired drive torque can be produced. The torque adjusting element can be controlled based on the accelerator pedal position in relation to the drive torque that can be produced by the driver, and, in a rocking-free process, alternating deflection and release of the accelerator pedal causes the drive torque to fluctuate. With the rotational speed and direction sensor system, the drive torque adjusting element is controlled to suppress drive torque transmission if the travel direction of a current unpowered vehicle movement is not the same as a forthcoming power-driven vehicle movement.


Patent
ZF Friedrichshafen AG | Date: 2015-04-13

A method of rocking a vehicle free, the vehicle having a drive-train (


Patent
ZF Friedrichshafen AG | Date: 2015-04-13

A method of releasing a stuck vehicle, in which a stuck situation is recognized and a rocking-free process is initiated and continued until the rocking-free process is suppressed. The rocking-free process is suppressed either after the activation of a parking brake of the vehicle, which was inactive at the beginning of and during the rocking-free process, for a predetermined time interval, or after the registration of a limit value of a deflection of a drive pedal of the vehicle and after the limit value of the deflection of the drive pedal is maintained or exceeded for a predetermined time interval, or after a vehicle speed falls to almost zero km/h, a minimum actuation of a drive pedal of the vehicle is registered, the vehicle speed is maintained for a predetermined time interval and the minimum actuation is maintained for the predetermined time interval.


Patent
ZF Friedrichshafen AG | Date: 2015-04-13

A method for releasing a vehicle from a recognized stuck condition including initiating a rocking-free process which is continued until the rocking-free process is automatically discontinued. The rocking-free process is discontinued after the registration and persistence of a vehicle movement for a predetermined time span while, at the same time, vehicle acceleration is registered for the predetermined time span, the extremes of the acceleration during the time span lie within a band-width-limited vehicle acceleration function range whose limits correspond almost to the global extremes of the vehicles acceleration, or after reaching and maintaining or exceeding a vehicle speed limit value for a predetermined time span and reaching or exceeding a steering path limit value during the predetermined time span, or after the activation of a door switch which was inactive before the beginning of the rocking-free process and maintaining the switch active for a predetermined time span.


Patent
ZF Friedrichshafen AG | Date: 2015-04-14

A clutch for an automatic transmission for a motor vehicle includes a clutch housing and a retaining ring. In an inner circumferential surface of the clutch housing concentrically at a central axis (M) of the cylinder jacket-shaped inner circumferential surface, a ring groove that is open radially inward is formed, within which the retaining ring is arranged. The retaining ring is thereby open and features two spaced ends. In the area of the ring groove, at least one stop is formed, whereas a distance between the ends from each other or the position of the stop is selected in such a manner that, in the assembled state, only one end of the retaining ring may come into contact with a stop, while the other end is spaced from this stop or an additional stop.

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