Zf Friedrichshafen Ag

Franz-Josef Schuler

Friedemann Jauch

Markus Henneken

Thomas Mauz

Kai-Uwe Herbster

Peter Spoerl

Michael Kiefer

Detlef Plath

Peter Schiele

Armin Gierling

Bernd Allgaier

Johannes Kemler

Walter Hecht

Clemens Kuhn

Adolf Bucher

Uwe Reitemeier

Wolfgang Vallaster

Andreas Maus

Norbert Müller

Eric Bosch

A method for operating a motor vehicle, the motor vehicle including a prime mover (), a transmission (), and a driven end (), wherein the transmission () is an automatic or automated transmission and is connected between the prime mover () and the driven end (). The method includes activating a sailing mode of the motor vehicle depending on at least one operating condition of the motor vehicle; performing a gear select interlock in the transmission (), while maintaining the sailing mode, when the sailing mode is active; and deactivating the sailing mode is subsequently depending on at least one operating condition of the motor vehicle. The gear select interlock is implemented in the transmission () depending on a rotational speed of the prime mover () and depending on synchronous speeds of the gears of the transmission ().

Method and control device for operating a motor vehicle

A selector lever for a transmission of a vehicle may include a monostable control element. Actuation of the monostable control element, without moving the selector lever, may triggers engagement of a parked position of the transmission when the transmission is not in the parked position and the drive motor is running. Further, actuation of the monostable control element may trigger a start process of the drive motor when the drive motor is off. Further, actuation of the monostable control element may trigger a shutdown process of the drive motor when the transmission is in the parked position and the drive motor is in on.

Selector lever for an automatic transmission or an automated manual transmission of a motor vehicle

A method for operating an automatic transmission of a motor vehicle, whereas the automatic transmission features several interlockable shifting elements, involves determining, from the data made available from the driving operation of the motor vehicle, a change to consumption of the motor vehicle expected to be caused by an activated interlocking of the shifting elements and a change to the shifting dynamics of the motor vehicle expected to be caused by an activated interlocking of the shifting elements. The changes are evaluated such that, depending on the change to consumption and depending on the change to shifting dynamics, an interlocking of the shifting elements is permitted or not permitted.

Method and control device thereto for operating an automatic transmission

A method of determining and shifting to an optimal gear in a vehicle prior to entering a curve in a vehicle which comprises an automatic transmission. A curve speed limit is determined for an anticipated curve which is recognized by a navigation device, an anticipated road pattern and dependent on the vehicle and curve or road data, and a sportiness indicator (Ftyp). For each anticipated curve, an actual, optimal gear is determined, based on the determined curve speed limit and the sportiness indicator (FTyp) and, after determining the optimal gear, the method performs a check to determine whether or not the optimal gear deviates from the engaged gear (RGA_DEST). When a deviation is recognized and a driver reaction, which causes a deceleration of the vehicle and/or a reduction of the vehicle speed, is present, a down shift down to the actual, optimal gear occurs.

Method for determining and selecting the optimal gear before driving into a curve for a motor vehicle having an automatic transmission

A method for operating a transmission of a vehicle drivetrain. A transmission ratio can be automatically changed during an operating state depending on a comparison of current operating state parameters with operating parameters stored in a control unit, and can be manually changed depending on a driver's request. Accordingly when the driver requests a change of the transmission ratio, the transmission ratio changes, and a timer starts. If the driver continues the ratio change from an actual transmission ratio value toward a larger or smaller transmission ratio value, the current operating parameters are compared with the stored operating parameters. Upon this comparison, the transmission shifts to higher ratios in comparison to the operating parameters stored in a control device at higher vehicle speeds, and/or a delay between sequential, cyclical transmission ratio changes varies depending on a vehicle deceleration and/or braking pressure in the region of a vehicle brake.

Method for operating a transmission unit of a vehicle driveline with an engine

A method of operating a transmission having a plurality of gears which can operate in an automatic shifting mode, during which a gear is selected automatically depending on the current driving situation, and also in a manual shifting mode during which a gear is selected depending on a driver's command. When the driver commands a shift, a change takes place from the automatic shifting mode to the manual shifting mode. A specific threshold value of the transmission output speed or an equivalent rotational speed value is associated with each gear and, when the driver commands a downshift, a target gear is determined as a function of the current transmission output speed or the equivalent rotational speed value. The gear selected as the target gear is the gear whose specific threshold value is higher than or equal to the current transmission output speed or the equivalent rotational speed value.

Transmission control method

A method for controlling a vehicles drivetrain including an engine and automatic transmission, such that transmission ratios are shifted within a range of transmission ratios in a continuous and/or stepped manner as function of preset target speeds that are adjustable via a vehicle speed control and actual vehicle inclinations in relation to the vehicles longitudinal axis. When the actual speed of the vehicle differs from a preset threshold speed, a request to change an actual ratio of the transmission is generated, if it has been determined that the output torque is smaller than a threshold value or an output torque required to adjust the preset threshold speed of the vehicle. The ratio of the transmission is shifted so the torque applied to the output is modified toward the output torque required to adjust the threshold speed.

Method for controlling a drivetrain of a vehicle, with a drive motor and a gearbox

Described is a method for controlling a transmission for motor vehicles, especially an automatic transmission or an automatic gearbox, where a gear ratio (') is adjusted according to operating conditions by means of pre-determined shifting programs ('', &#x201c;Eco', &#x201c;Normal&#x201d;, &#x201c;Sport&#x201d;, &#x201c;Mountain II&#x201d;, &#x201c;Warm-up&#x201d;, &#x201c;Tip&#x201d;) and corresponding specific shifting values (HS, RS) and where in relation to a vehicle's actual operating condition at least one special function (&#x201c;Curve Recognition KE&#x201d;, &#x201c;Rapid Drive Pedal Release FO&#x201d;, &#x201c;Spontaneous Delay Vehicle SVF&#x201d;, &#x201c;Drive Speed Control FGR&#x201d;, &#x201c;Drive Dynamic control ESP&#x201d;) is activated, which prevents the change from an actual gear ratio to a target gear ratio requested by a shifting program within a pre-determined operating range of a vehicle. In a first version of the method, the operating range, wherein a gear ratio change of the transmission is prevented, is changed in relation to applied specific values that depend on the operating condition. In a second version of the method it is planned that the shifting characteristics are changed in relation to applied specific values that depend on the operating condition in such a manner that the operating points of the vehicle that are defined on the side of the shift characteristics, for which gear ratio changes must be performed, are adjusted to the actual operating condition of the vehicle.

Method for controlling the transmission of a vehicle

In the method for kick-down switching speed optimization in a motor vehicle with an automatic transmission, the kick-down upshift point is determined as a function of the load conditions and the road inclination in each case.

Kick-down switching speed optimization for an automatic transmission of a motor vehicle

A method for modifying a defined adaptive driving strategy, which is stored in the control system for an automatic transmission of a motor vehicle, for adaptation to another type of driver with a different driving style, consists in that the parameters used for the driving strategy are modified by the other driver, the data for this being input to the transmission electronics via an input unit and an interface with the electronics.

Method for modifying a defined adaptive driving strategy

A method is described for operating an automatic transmission in which a command for changing a current ratio of the automatic transmission is generated when achieving preset operating states of the vehicle automatically or by manual input in a manual shifting mode, the activated manual shifting mode being preferred to an automatic shifting mode. The manual shifting mode is quit when a current vehicle speed is less than a threshold value, or when a longitudinal acceleration of the vehicle is within a defined range, a lateral acceleration is less than a threshold value and a driver type evaluation counter is less than a limiting value.

Method for operating an automatic gearbox on a motor vehicle

A shift device for an automatic transmission of a vehicle, particularly of a motor vehicle, is proposed in which the request to change the current ratio of the automatic transmission upon reaching preset operating states of the vehicle can be automatically generated or by manual input in a manual shifting mode. A pulse counter is here provided by way of successive pulses and manual input can be functionally interlinked wherein a shift signal can be generated depending on the linkage.

Shift device for an automatic transmission of a vehicle

A method for controlling an automatic transmission of a motor vehicle in the event of a spontaneous gas/pedal release (FastOff). The automatic transmission is driven by an internal combustion engine which can be influenced by an accelerator pedal and a signal proportional to a pedal position is fed to an electronic transmission control in which shifting characteristic field is stored and the spontaneous gas/pedal release (FastOff) is detected and an upshift block (FFO=1) is activated when a pedal position gradient (PSTG) falls below a pedal gradient threshold (KF_PSTG). The mode of the upshift block (FFO=1) is removed when a traction operation is detected when an actual engine torque (MMM) exceeds a push-pull line (KL_ZS) stored as a function of a value equivalent to an engine rotational speed (NMO) in dependence on a vehicle acceleration/deceleration (AIST) dependent on an overall tractional resistance (GFW) and pedal gradient thresholds (KW_PSTGPOS, KW_PSTGNEG).

Method for controlling an automatic gearbox of a motor vehicle in the event that the gas/pedal is spontaneously released

A method for control of an automatic transmission for a motor vehicle equipped with cruise control consists in that during cruise control of the transmission control changes to a separate driving program which is function of external influences, especially of the road inclination. This driving program is updated according to external influences. In the &ldquo;set&rdquo; state, change is made to the separate driving program and in the &ldquo;restore&rdquo; state the control can be adjusted so that the separate driving program be activated immediately or not until reaching the &ldquo;set&rdquo; control state.

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Kressbronn, Germany

Franz-Josef Schuler