Zf Friedrichshafen Ag

Stefan Wallner

Johannes Kaltenbach

Notker Amann

Christian Mittelberger

Klaus Kruber

Ulrich Mair

Stefan Blattner

Mesut Er

Friedrich Saibold

Winfried Fakler

Ralf Dreibholz

Kai Bornträger

Friedrich Tenbrock

Grzegorz Ziemski

Markus Hülsmann

The invention relates to a method for controlling a creep mode of a vehicle comprising a hybrid drive (), a drive train () which essentially comprises an internal combustion engine (), an electric machine (), a gear-shift element () arranged between the internal combustion engine () and the electric machine (), a transmission () and a power take-off (). The aim of the invention is to allow an efficient creep mode which is substantially temporally unlimited and reliable and wherein an electrical energy storage device () is used as little as possible. The method according to the invention is characterized in that primarily the gear-shift element () is used when the internal combustion engine () is running and secondarily, depending on a monitoring of defined operation parameters of the gear-shift element () and/or of variables relevant for the creep mode, the electric machine () is used to implement the creep mode. A device for carrying out the method comprises control and monitoring means () which are used for producing a creep torque, taking into consideration an admissible load of the gear-shift element (), primarily by operating the gear-shift element () in a slip mode and secondarily by operating the electric machine () in a creep mode.

Method and device for controlling a creep mode of a vehicle comprising a hybrid drive

A method and a device for operating a hybrid drive of a vehicle includes a parallel hybrid drive train having an internal combustion engine, at least one electric machine, a shift element interposed between the internal combustion engine and the electrical machine, a automatic transmission, and a power take-off. The internal combustion engine is frictionally connected to the electrical machine via the shift element and may be started by the electric machine. A coordinated sequence of functions with defined intermediate states is called up. A state of the shift element for the synchronization of a transmission input of the transmission to a target transmission input speed is varied once the engine has been started. The synchronization is performed either purely with an electromotive force or with a force produced by a combination of the electrical machine and the internal combustion engine.

Method and device for operating a hybrid drive of a vehicle

The invention relates to a method and a device for controlling a creep mode of a vehicle having a hybrid drive system ('), having a parallel hybrid drivetrain (&#x2032;) comprising an internal combustion engine (), at least one electrical machine (), a first switching element () designed as a frictional element and disposed between the internal combustion engine () and the electrical machine (), by means of which the internal combustion engine () can be connected to the electrical machine (), a gearbox (), an output (), and at least one second switching element () designed as a frictional element and disposed between the electrical machine () and the output (), by means of which the electrical machine () can be operationally connected to the output (). In order to allow low-cost, effective long-term creeping that is gentle on the components, and thereby ensures reliable availability of electrical energy for electrical loads of the vehicle, the creep mode is alternately implemented by an internal combustion engine creep mode generated by means of operating at least one switching element () in slip, and an electrical motor creep mode at least supported by means of the electrical machine ().

Method and device for controlling a creep mode of a vehicle having a hybrid drive system

The invention relates to a method and device for controlling a creep operation of a vehicle with a hybrid drive (), comprising a parallel hybrid drivetrain (), with an internal combustion engine (), at least one electric motor (), a first switching element () in the form of a friction element between the internal combustion engine () and the electric motor (), a gearbox (), an output () and a second switching element () arranged between the electric motor () and the output (). According to the invention, a simple, effective and component-friendly continuous creeping can be achieved without additional constructional or economic costs can be achieved, wherein the creeping operation is carried out with the internal combustion engine () running and both switching elements () simultaneously operating with slip, wherein the total operating power required to generate a required creeping torque is variably distributed over both switching elements ().

Method and device for controlling a creep operation of a vehicle with a hybrid drive

A method for determining conditions of a hybrid drive train of a motor vehicle. The method determines, the actual conditions () of the drive train from predetermined condition parameters of the actuating device of the hybrid control. The condition parameters include whether or not a flow of force is present between a combustion engine (VM) and an electrical engine (EM), whether or not the combustion engine (VM) is operating, and whether or not a flow of force to the output is present.

Method for determining states of hybrid drive train of a vehicle

A motor vehicle control system for controlling a motor vehicle with a hybrid drive comprising an internal combustion engine and an electric motor, with a strategy sub-component, a control sub-component and an actuator sub-component. The functional components include at least an internal combustion engine functional component, a transmission functional component, such that the strategy sub-component () of the hybrid functional component () comprises an operating status prescription module which determines a prescribed value for the operating status of the hybrid drive and transmits the prescribed value to the control sub-component () of the hybrid functional component () such that the control sub-component () of the hybrid functional component () comprises a first module () and a second module ().

Hybrid drive motor vehicle control system comprising distributed functional components for controlling hybrid drive operating status

A method of operating a drive train of a motor vehicle whereby the drive train comprises at least a hybrid drive with a combustion engine and an electric motor, a transmission, positioned between the hybrid drive and an output, and a clutch, positioned between the combustion engine and the electric motor. When the electric motor is exclusively driving, the combustion engine can be started by engaging a clutch positioned between the combustion engine and the electric motor. In accordance with the invention, when there is an exclusive electromotive drive and the electric motor is operated in a deceleration mode and, when a request by a driver is interpreted as a desired change from a deceleration mode to a traction mode, the combustion engine is started, by using the deceleration/traction change, in a way that the clutch, positioned between the combustion engine and the electric motor, is at least partially engaged so that the clutch transfers the required torque which is needed for starting the combustion engine.

Method for operating a drive train

A method of controlling and/or regulating a hybrid drive system of a vehicle, with at least one internal combustion engine and at least one electric machine which can be coupled to the input shaft of an automated transmission, at least some of the time, by at least one clutch to facilitate driving of the vehicle such that at least one energy accumulator is charged by the electric machine which is operated as a generator and driven by the internal combustion engine. The electric machine is a synchronizer machine that is continually energized by maintaining a nominal speed of the synchronizer machine below an inflexion speed (n_Eck) during the charging process.

Method for controlling and/or regulating a hybrid drive arrangement

A control system for controlling a vehicle with a hybrid drive comprising an internal combustion engine and an electric motor and a plurality of functional components each divided into strategy, control and actuator sub-components. The functional components include engine, transmission and hybrid functional components. The strategy sub-component of the hybrid functional component comprises an operating status prescription module which determines a recommended value for the operating status of the hybrid drive and transmits the recommended value to the control sub-component. The possible recommended value that can be determined by the operating status prescription module is a preselected hybrid driving condition, and if the operating status prescription module of the strategy sub-component transmits the preselected hybrid driving condition, as the recommended value, to the control sub-component, then the strategy sub-component prescribes a change from electric to hybrid driving, while the control sub-component determines when change occurs.

A method of carrying out a shift under load in either an electric vehicle which has a change-under-load transmission or a hybrid vehicle which has a hybrid transmission while the vehicle is operating in a purely electrical mode. The speed adaptation of the electric machine, which is required for synchronization to a new gear, is carried out in a speed regulation mode.

Method for carrying out a load shift in vehicles with electric drive

A method of carrying out a shift with traction force interruption during hybrid operation in a parallel hybrid vehicle having an automated transmission. The method comprises the steps of maintaining the coupling between the internal combustion engine () and the electric machine (), eliminating the load before disengaging the old gear, and synchronizing to the new gear by the operation of the electric machine ().

Method for carrying out a shift during hybrid operation in a parallel hybrid vehicle

A method of carrying out a shift under load during hybrid operation in a parallel hybrid vehicle in which the speed adaptation of the electric machine and the internal combustion engine, required for synchronization to the new gear, is carried out by adapting the speed of the electric machine in a speed regulation mode.

Method for carrying out a load shift in a parallel hybrid vehicle during hybrid operation

A method for controlling a drivetrain including a combustion engine, electric motor/generator and a transmission inter-coupled, via a summarizing gear, with one output and two input elements and, via a clutch, with each other. One input element is fixed to the engine, the second input element is fixed to the motor/generator and the output element is fixed to the input shaft of the transmission. The clutch is between two elements of the summarizing gear. Before a gearshift, torques of the engine and motor/generator are reduced and the clutch disengaged. To quickly reduce torque in the summarizing gear, the engine torque is reduced after a defined time, such that the clutch disengages when the slippage is proportional to the lowering engine torque and the motor/generator torque, in a ratio of torques at the beginning of torque reduction, is reduced proportionally to the engine torque.

Method for controlling a motor vehicle drive train

A method of carrying out a shift operation with traction force interruption during hybrid operation when the electric machine has failed or the energy accumulator is full in a parallel hybrid vehicle having an automated transmission. During an upshift, the power inverter, connected to the electric machine, is actuated with an active short-circuit whereby a torque is generated, at the electric machine, which is used for synchronizing the transmission input.

Method for carrying out a tractive-force interrupted shifting in a parallel hybrid vehicle

A method for wear-free braking of a vehicle having an electrodynamic drive system including an electric machine and a planetary gearset with a crankshaft of the combustion engine being connected with a first element of the gearset, the electric machine connected to a second element of the gearset and a transmission input shaft connected to a carrier of the gearset. The friction clutch serves as a bridging clutch to detachably connect two elements of the gearset such that when the clutch is engaged, the gearset is locked and the combustion engine operating in thrust mode applies braking torque to the drive train, the clutch is disengaged and a transmission input speed exceeds a predetermined threshold value, the speed of the combustion engine is raised to a maximum speed by appropriate control of the electric machine.

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Friedrichshafen, Germany

Stefan Wallner