Bayerische Motoren Werke Aktiengesellschaft

Other

Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg

Josef Neuner

Rudolf Ehrmaier

Norbert Woeste

Sigmund Fuerst

Joerg Michael

Anette Sedlmaier

Wolfgang Kundermann

Guenter Ruehle

Achim Siepker

Gunther Petrzik

Karl-Heinz Hodermann

Roland Gollmer

Marco Noack

Renate Walk

Alois Abel

Norbert Wöste

A vehicle has an internal combustion engine, an automatic transmission with an electrohydraulic transmission control unit, a transmission oil pump driven by the engine, and an electronic engine start and stop system. The start and stop systems switches off the internal combustion engine in operating phases, in which the vehicle is temporarily stopped, if predefined operating parameters are present, and starts the internal combustion engine if a restart signal is present. A purely mechanical pressure accumulator device provides stored hydraulic pressure to the electrohydraulic transmission control unit in a time period following the starting of the internal combustion engine, in which time period, the transmission oil pump is still building-up pressure.

Vehicle having an automatic transmission and an automatic engine start/stop system

A method for controlling a hydraulic circuit for a twin-clutch transmission, wherein the hydraulic circuit comprises a first and a second clutch that can be hydraulically actuated, the pressures of said clutches being controlled with respective pressure control valves, and wherein a safety circuit substantially guarantees a safe state for the hydraulic circuit if a malfunction occurs. The safety circuit is configured such that if a partial malfunction affecting only one of the two clutches occurs, the affected clutch is disengaged and if a total malfunction affecting both clutches occurs, the clutch with the lower clutch pressure at the time of the total malfunction is disengaged and the other clutch with the higher clutch pressure at the time of the total malfunction remains engaged to maintain the transfer of torque via said clutch.

Hydraulic circuit and method for controlling said circuit

A double clutch drive has a first and a second clutch, wherein for normal operation for the closing and opening of the first clutch a first hydraulic device governed by an electronic control is provided, and for the closing and opening of the second clutch a second hydraulic device is provided. Also, a position-holding hydraulic device is provided to which position signals are delivered corresponding to the momentary position of the first and second clutch, and which is connected via hydraulic control lines with the first and second hydraulic device, while in the event of a failure of the electronic control the position-holding hydraulic device hydraulically operates the first and the second hydraulic control such that, at least in many positions of the clutches, the clutch positions that are present immediately prior to the failure of the electronic control are sustained.

Double clutch drive with position maintaining function

Monostable shifting mechanism, in which two shifting channels are provided for the shift lever. 'Monostable' means that the shifting element or the shift lever has only one stable position. As a function of the actual 'operating condition' of the shifting mechanism, certain other operating conditions can be selected by means of the deflection of the shift lever. For this purpose, the shift lever is deflected manually in either one or the other shifting channel and, after the release, automatically returns into the stable starting position from any possible deflected position.

Transmission shifting mechanism

The invention relates to a device for increasing the security of a motor vehicle comprising an automatic transmission, which is impinged upon by an electrical transmission control system and a detection unit for detecting a critical driving situation and for generating a corresponding signal. In order to increases driving security, an evaluation device is provided which checks whether the generated signal has reached a specific value or exceeded a specific threshold. If said value has been reached or the threshold has been exceeded, the evaluation device causes the transmission control system to interrupt the positive engagement of the transmission.

Device for increasing the security of a motor vehicle

A driving coupling for the torque transmission in the transmission line of a motor vehicle includes a shaft-hub coupling provided with longitudinal toothings for the releasable coupling of a crankshaft with a coaxially arranged hydrodynamic torque converter. The longitudinal toothings of the shaft-hub coupling have tooth cross-sections which become larger and smaller respectively in the longitudinal direction of the teeth. An elastomer layer is situated at least between the tooth flanks of the shaft and the hub which transmit the torque.

Torque converter coupling

A driving position selector for selecting at least the driving steps of the automatic transmission, &ldquo;D&rdquo;, &ldquo;N&rdquo;, &ldquo;R&rdquo;, &ldquo;P&rdquo;, which are selected by the driver over a control device and engaged by electro-hydraulic setting elements is provided. It is possible to disengage a parking position by a release device in the automatic transmission housing. An operating device is connected by a Bowden cable with a release lever of the release device. The swiveling motion of the release lever is not transferred to the Bowden traction cord, since the release lever can move along a Bowden traction cord suspended in the release lever.

Driving position selector with an emergency release for a parking position

An assembly including a driving connection for torque transmission in a drive train of an engine by means of a shaft-hub connection. The shaft-hub connection is provided with lengthwise teeth for releasable connection of a crankshaft with a coaxial hydrodynamic torque converter. The lengthwise teeth of the shaft-hub connection have tooth cross sections that increase or decrease in the lengthwise direction of the teeth.

Torque transmitter connection assembly

The invention relates to an automatic gearbox for motor vehicles, comprising an electronic drive control device and an electric gear range selecting element. In case the drive control device fails such that the gears can no longer be changed when the gear range selecting element is actuated with a view to changing gear range, and if the gears which can be changed by means of the gear range selecting element can be identified, the driver receives a corresponding optical, acoustic and/or haptic feedback signal which indicates said failure. In case the gera rage selecting element fails in such a way that the gear ranges adjustable by means of said gear range selecting element can no longer be identified, a corresponding optical, acoustic and/or haptic feedback signal which indicates said failure is immediately transmitted to the driver.

Automatic gearbox for motor vehicles

A motor vehicle has a transmission controlled by an electronic transmission unit and an internal-combustion engine controlled by an electronic engine unit. The transmission unit normally shifts the selected gear by controlling actuators in the transmission, as a function of the adjustment of a gear selection switch. In an emergency, which can be detected by the engine unit via a communication connection with the transmission unit, and in which the adjustment of the gear selection switch is not detected by the transmission unit and/or the selected gear cannot be shifted in the transmission, the engine unit enforces a limitation of vehicle acceleration.

Motor vehicle having a transmission controlled by an electronic transmission unit

A motor vehicle having a driving engine and an automatically shifted transmission, particularly an automatic transmission, includes at least one selector lever used as the operating element. With this selector lever, a driver triggers an electric transmission control device which, as a function of an operating position for the automatically shifted transmission selected on the selector lever and of other operating parameters of the motor vehicle, controls the automatically shifted transmission. By deflecting the selector lever, certain operation positions of the automatically shifted transmission are selected. This selector lever can be moved along at least one shifting channel, for preselecting individual driving positions in the automatic operation, into at least two deflecting directions. The lever automatically returns from the two deflecting positions always into the same starting position. Always the same driving position of the automatically shifted transmission is assigned to each deflecting direction of the selector lever in the shifting channel for the preselecting of individual driving positions in the automatic operation, and, in at least one deflecting direction of the selector lever, two different driving positions can be selected. The selector lever, for selecting a first driving position, is movable a first distance to a first stop in the deflecting direction, and, for selecting a second driving position, the selector lever is movable a second, longer distance to a second stop in the same deflecting direction, in which case the first stop is overpressed.

Motor vehicle having a selecting device

A selecting device facilitates selecting operating positions of an automatic transmission of a motor vehicle by the deflection of a selector lever which moves back automatically from all deflecting directions for selecting the individual operating positions. The automatic transmission can be controlled by this selector lever in a first operating mode&mdash;selecting individual driving positions in the automatic operation&mdash;or, in a second operating mode&mdash;step-by-step shifting of the gears in the manual operation. For each operating mode, one operating position of the automatic transmission respectively is assigned to each deflecting direction of the selector lever. The selector lever is movable, in two shifting channels which are essentially disposed perpendicularly with respect to one another such that maximally four operating positions can be selected in each of the two operating modes. In a third operating mode, cruise control functions can be controlled by means of the selector lever.

Selecting device for an automatic transmission of a motor vehicle

A motor vehicle having an electronically controlled automatic transmission, which comprises a parking position, and a power parking brake. The parking position and the power parking brake are operable independently of one another. A redundant system is provided in that a device checks the parking position as well as the power parking brake with respect to its optional functioning and, in the event of an operating failure of one system, operates the respective other system to take over the function of the failed system.

Motor vehicle having an electronically controlled automatic transmission and a power parking brake

The invention relates to a method for selecting a gear position of an automatic vehicle transmission with at least one forward gear position and a reverse gear position, in the case of which, at defined operating conditions, a shifting operation from the forward gear position into the reverse gear position or vice versa is ignored. The object of avoiding faulty operations when operating an automatic transmission and increasing the driving comfort is achieved in that the shifting operation is carried out up to a defined first speed of the vehicle, in that, in a speed range of the vehicle between the first and a second speed, during the shifting operation, only a neutral gear position is engaged, and in that the shifting operation is ignored above the second speed.

Method for selecting a gear position of an automatic transmission

A selecting device for an automatic transmission of a motor vehicle is suggested in the case of which the selector lever can be swivelled back and forth between two different shifting channels. One shifting channel for the step shifting permits a manual shifting of the automatic transmission; the other shifting channel for engaging the individual driving positions permits the automatic operation of the transmission. The selecting device is designed such that it requires little space and is constructed in a simple manner of few component parts.

Growing community of inventors

Raubling, Germany

Josef Neuner