Abstract: A method and a device for starting an internal combustion engine of a motor vehicle, the internal combustion engine exerting a drive torque on a crankshaft in one direction of the internal combustion engine, a starting motor exerting a starting torque on the crankshaft during a starting process to achieve a minimum rotational speed of the internal combustion engine, and a control unit regulating the starting torque. The control unit regulates the starting torque in a time-dependent manner between a positive maximum starting torque and a negative minimum starting torque during the starting process, a positive starting torque acting on the crankshaft in one direction and a negative starting torque in the opposite direction.

Abstract: A method and a device for starting an internal combustion engine of a motor vehicle, the internal combustion engine exerting a drive torque on a crankshaft in one direction of the internal combustion engine, a starting motor exerting a starting torque on the crankshaft during a starting process to achieve a minimum rotational speed of the internal combustion engine, and a control unit regulating the starting torque. The control unit regulates the starting torque in a time-dependent manner between a positive maximum starting torque and a negative minimum starting torque during the starting process, a positive starting torque acting on the crankshaft in one direction and a negative starting torque in the opposite direction.

Abstract: A method actuates two clutches which transmit torque in parallel in a drive train of a motor vehicle and have different successive fixed speed transmissions as gear stages between a drive shaft and an output shaft. The clutches are triggered during acceleration processes of the motor vehicle that both clutches simultaneously transmit torques and a resulting transmission of torque takes place continuously between the drive shaft and the output shaft. The rotational speed of the drive shaft is greater than the respective rotational speed of the respective transmission input shaft of the respective partial train at the secondary end of the respective clutch during the entire starting process, or the rotational speed of the drive shaft is greater than or the same as the respective rotational speed of the respective transmission input shaft of the respective partial train at the secondary end of the respective clutch during an acceleration process.

Abstract: A method is proposed for determining a clutch application point in a transmission of a vehicle having a spring-actuated clutch system in which the clutch application point is adapted according to at least one adequate regulated quantity of the clutch system.

Abstract: A method is proposed for determining a clutch application point in a transmission of a vehicle having a spring-actuated clutch system in which the clutch application point is adapted according to at least one adequate regulated quantity of the clutch system.

Abstract: A known device for increasing the functional reliability for a hydraulic circuit of a hydraulic clutch having a pressure reservoir (25) and a release cylinder (5) which comprises a primary piston (14) and a secondary piston (16). A compensation volume is developed in the sense that when the vehicle is at a standstill and the parking brake released, an unintentional release of the clutch is prevented. A pressure-monitoring/pressure-supply device (28) is used for determining a reference operating pressure and establishes a static pressure which, in case of any system error, only allows displacement of the secondary piston (16) such that the contact pressure of the clutch discs, against one another, is still sufficient to maintain the vehicle at a standstill.

Abstract: A method actuates two clutches which transmit torque in parallel in a drive train of a motor vehicle and have different successive fixed speed transmissions as gear stages between a drive shaft and an output shaft. The clutches are triggered during acceleration processes of the motor vehicle that both clutches simultaneously transmit torques and a resulting transmission of torque takes place continuously between the drive shaft and the output shaft. The rotational speed of the drive shaft is greater than the respective rotational speed of the respective transmission input shaft of the respective partial train at the secondary end of the respective clutch during the entire starting process, or the rotational speed of the drive shaft is greater than or the same as the respective rotational speed of the respective transmission input shaft of the respective partial train at the secondary end of the respective clutch during an acceleration process.

Abstract: A method for clutch actuation at low temperatures for a motor vehicle having a hydraulically actuatable clutch, below a predetermined temperature a situation-dependent pre-opening of the clutch is executed when a braking is probable.

Abstract: A device for rendering a hydraulic actuating device operational. A motor vehicle clutch with an emitter-receiver system located in the transmission path of the actuating device comprising two pistons whose positions, relative to one another, can vary as a function of the desired operating behavior of the actuating device and is developed further such that in relation to the emitter-receiver system that is to be filled with fluid, operationality can be established comparatively quickly and by simple way. A fluid supply unit (24) comprises one impulse valve (25) that serves to release an essentially constant volume flow, acted upon by an impulse valve control device (26) which is constructed such that the fluid volume flow released by the fluid supply unit (24) and flowing into the emitter-receiver system (5) does not exceed a limiting volume flow QK.

Abstract: A known device for increasing the functional reliability for a hydraulic circuit of a hydraulic clutch having one pressure reservoir and one release cylinder which comprises a primary piston, a secondary piston and a compensation volume is to be further developed in the sense that when the vehicle is at a standstill and the parking brake released, an unintentional release of the clutch is prevented. According to the invention there is used for the purpose a pressure-monitoring/pressure-supply device (28) which determines a reference operating pressure and establishes a static pressure which in case of system errors allows only a displacement of the secondary piston (16) such that the contact pressure of the clutch discs against each other is still sufficient to hold the vehicle at a standstill.

Abstract: An operating time is determined by an approximation method within the scope of the method for determining the actual operating time of a hydraulic, electrohydraulic or electric component of a motor vehicle or of a working machine within a reference time or a monitoring period.

Abstract: A device for rendering a hydraulic actuating device operational. A motor vehicle clutch with an emitter-receiver system located in the transmission path of the actuating device comprising two pistons whose positions, relative to one another, can vary as a function of the desired operating behavior of the actuating device and is developed further such that in relation to the emitter-receiver system that is to be filled with fluid, operationality can be established comparatively quickly and by simple way. A fluid supply unit (24) comprises one impulse valve (25) that serves to release an essentially constant volume flow, acted upon by an impulse valve control device (26) which is constructed such that the fluid volume flow released by the fluid supply unit (24) and flowing into the emitter-receiver system (5) does not exceed a limiting volume flow QK.

Abstract: A method is proposed for determining a clutch application point in a transmission of a vehicle having a spring-actuated clutch system in which the clutch application point is adapted according to at least one adequate regulated quantity of the clutch system.

Abstract: An actual operating time is determined by an approximation method within the scope of the method for determining the actual operating time of a hydraulic, electrohydraulic or electric component of a motor vehicle or of a working machine within a reference time or a monitoring period.

Abstract: The invention relates to a method for controlling a pressure supply device in a hydraulic circuit, especially in a hydraulic circuit in an automatic gearbox which comprises an hydraulic pump, a pressure control valve and a consumer. The hydraulic pump is controlled if the system pressure falls below a specific lower threshold value and is switched off if a specific higher threshold value of the system pressure is reached or exceeded. In the data on the system pressure is not available, the current system pressure is calculated.

Abstract: A method for clutch actuation at low temperatures for a motor vehicle having a hydraulically actuatable clutch, below a predetermined temperature a situation-dependent pre-opening of the clutch is executed when a braking is probable.

Abstract: Within the scope of the method for adjusting the ratio value for a continuously variable transmission having a variator, a minimum contact pressure force P1,min, and/or P2,min is continuously calculated for the two variator discs on the basis of the actual ratio and of the actual torque to be transmitted and according to the calculated contact pressure minimum force the primary or the secondary disc is determined as controlled variable to be used for the variator ratio, the controlled variable being determined by a comparison of the required pressure values P1,soll or P2,soll with the calculated contact-pressure minimum value in a manner such that if P1,soll≦P1,min, the controlled variable changes from the primary to the secondary side and if the condition P2,soll≦P2,min is fulfilled, the secondary side changes to the primary side, the primary side being the controlled variable at the start of the method.

Abstract: Within the scope of the method for regulating the rotational speed difference of a switchable frictional engagement control, specially of a clutch or brake, in the driving train of a motor vehicle by means of a control closed loop with the desired rotational speed difference as reference input and the actual rotational speed difference as controlled variable, together with the clutch pressure or brake pressure to be adjusted, at least one other controlled variable is used, wherein the closed loop comprises a linear governor and damping members (TP1, TP2, TP3) in a manner such that the time shift of the damped variable per reading step does not exceed a predetermined value so that the exciting of the closed loop remains within a stable range for controlling.

Abstract: Within the scope of the method for controlling the engine rotational speed via the torque converter lock-up clutch during the starting and stopping phases of a motor vehicle having a continuously variable transmission combined with other elements of the drive train, the closing and opening of the torque converter lock-up clutch are used as implicit function so as to ensure optimum comfort via the most asymptotic adjustment possible of the rotational speeds gradients of engine and turbine during starting and by a soft, defined separation of the speed characteristic curves of the engine and turbine during stopping. When the vehicle is standing still the forward clutch is moved into standstill disengaged mode so that the torque converter lock-up clutch can be fully closed.

Abstract: In a method for controlling the multiplication for a continuously variable transmission with electrohydraulic control by means of a control loop having a linear PID controller with the specified multiplication of the variator iv_soll as command variable, the actual multiplication iv as regulating variable and the multiplication changing speed as correcting variable, the correcting variable delivered by the PID controller is limited to limiting values determined by the design for an upshift and downshift wherein said limiting values are calculated form the limits determined by construction and from the operating-point dependent limits determined by volume flow and the intersection of both admissible intervals determined by construction and by volume flow is defined as admissible multiplication changing speed range.