Continental Teves, Ag and Company Ohg

Itt Manufacturing Enterprises, Inc.

Itt Automotive Europe Gmbh

Continental Automotive Technologies Gmbh

Ralph Gronau

Gunther Buschmann

Andreas Neu

J&uuml;rgen Woywod

Tobias Scheller

Dieter Burkhard

Ralf Richard Reviol

Holger Kollmann

Lothar Kienle

Peter Leska

Michel Wagner

Artur Kost

Jörg Berntheusel

Georg Roll

Norbert Ehmer

Alexander Stiller

Peter Säger

Dirk Waldbauer

Torsten Herrmann

Peter Wanke

Thomas Kranz

Roland Caspari

Thomas Striegel

Jürgen Woywod

Hans Georg Ihrig

Michael Kremer

Jurij Schmidt

Alexander Treib

Hans-Georg Ihrig

Gerold Schneider

Guntjof Magel

Nathan Zambou

Peter Schubert

Dirk Leise

Tobias Franke

Burkhard Sappok

Jusuf Muratoski

Utz Lambert

Harald Heyn

Alexander Bauer

Erik Händler

Silvio Färber

Patrik Henke

Patrick Merzoug

Ralf Revoil

Michael Wagner

A method for regulating a pressure setting in a braking system includes receiving a pressure demand and determining a pressure demand gradient from the pressure demand, determining a volume flow requirement from the pressure demand gradient, generating a hydraulic pressure by utilizing a pressure application device, determining an actual volume flow of the pressure application device, regulating an overflow valve on the basis of the pressure demand and the difference between the actual volume flow and the volume flow requirement. A special mode is activated when the pressure demand gradient exceeds a gradient limit value, a minimum value for the volume flow requirement being set in the special mode on the basis of a last maximum of the volume flow requirement. The special mode is deactivated when a difference between the pressure demand and a system pressure falls below a first limit value.

Method for regulating the pressure position in a braking system

In a method for optimizing the pressure setting accuracy, a hydraulic pressure is built up according to a pressure requirement of a hydraulic pump, and overflow control is performed using an analog-controlling hydraulic valve and a known control characteristic curve of the analog-controlling hydraulic valve, which overflow control counteracts a pressure build-up produced by the hydraulic pump that exceeds the pressure requirement. In addition to the known control characteristic curve of the analog-controlling hydraulic valve, at least one additional valve characteristic is taken into account for the overflow control.

Method for optimizing the pressure setting accuracy

A control valve conditioning method in an electrohydraulic pressure control unit comprising at least one electrically triggered solenoid valve that is controlled in an analog manner. The solenoid valve is operated at a specific operating current according to a functional correlation or characteristic diagram between the valve current and the differential pressure characteristic curve when the pressure is controlled, said functional correlation or characteristic diagram being stored in the pressure control unit. The method comprises the following steps: a) temporarily applying at least one anti-hysteresis pulse to the solenoid valve during which a current is set far below or far above the operating current in the valve; b) applying the anti-hysteresis pulse at the desired operating current before or during controlled operation, and c) applying the anti-hysteresis pulse wherein the duration is limited in such a way that the anti-hysteresis pulse has largely no influence on the brake pressure.

Method for conditioning a control valve

A vacuum brake booster and a method of operation of a vacuum brake booster of a vehicle brake system is disclosed. The vacuum brake booster includes a housing subdivided into at least one vacuum chamber and at least one working chamber. The vacuum chamber is connected to a vacuum source by way of a vacuum port. A sensor unit is associated with the vacuum chamber and is configured for sensing a pressure in the vacuum chamber and supplying a sensed pressure value to an electronic control unit (ECU). The ECU includes an evaluating unit for evaluating the sensed pressure value and calculating the operating point of the vacuum brake booster solely on the basis of the sensed pressure in the vacuum chamber. Plausibilization of the sensed pressure value is performed to monitor the overall system and identify defects of the sensor unit or the vacuum brake booster.

Vacuum brake booster and method for the operation thereof

In a method for controlling the pressure buildup in an electronically controllable brake system, preferably for use in motor vehicles, including a master brake cylinder, in particular a tandem master brake cylinder (TMC), a vacuum brake booster (booster), at least one additional pressure source for brake force assistance, preferably a hydraulic pump which is drivable by a controlling unit and the pressure of which can be applied to wheel brakes of the vehicle, an approach of a point where the auxiliary-force to actuating-force ratio (operating point) of the vacuum brake booster (booster) falls below a predetermined ratio is detected, that a pressure gradient in the master brake cylinder (TMC pressure gradient) is detected, and that in the event of a detected approach of the operating point of the booster and when a pressure gradient limit value of the detected TMC pressure gradient is exceeded, the additional pressure source is activated for brake force assistance, for the purpose of building up additional brake pressure.

Method for controlling the pressure buildup in an electronically controllable brake system

The invention relates to a method for controlling the driving stability of a vehicle, wherein it is determined when a stable or unstable driving behavior prevails whether a tendency to a subsequent unstable driving behavior exists as a result of a highly dynamic inward swerve. In order to provide a method for controlling driving stability, which allows a reaction to predicted unstable driving situations by means of an intervention diminishing or avoiding critical driving situations, the steering force and/or the steering angle of a steering handle is corrected in this case in such a manner that when the steering handle is operated, the driver is assisted in the direction of an understeering vehicle course.

Method for regulating driving stability

In a method for determining or calibrating the brake control characteristic of a vacuum brake booster of a vehicle brake system, the pressure in the working chamber or the pressure difference between the working chamber and the vacuum chamber of the vacuum brake booster is determined, and either the brake control characteristic is determined on the basis of the determined pressure or pressure difference of the vacuum brake booster, or the stored brake control characteristic is changed according to the determined pressure or pressure difference.

Method for determining or calibrating the brake control characteristic of a vacuum brake booster

A method for allocating wheels of a motor vehicle to a respective vehicle axle, each of the wheels includes an inflation tire whose tire pressure is monitored by a tire pressure monitoring device including at least one transmitting module in each wheel, and at least one receiving module arranged at or in the vehicle and one evaluation module, with each transmitting module transmitting tire pressure information and a wheel-specific identification number to the receiving module, which are sent to an evaluation process in the evaluation module, and tire pressure changes of the wheels are considered for the allocation, with the wheels having almost identical tire pressure changes being allocated to one vehicle axle by taking into account a vehicle-specific axle load.

Method for assigning wheels of a motor vehicle to the respective vehicle axle

The invention relates to a method for improving the control behavior of motor vehicle control systems such as ABS, ESP, etc. comprising electrically driven hydraulic pumps, inlet and outlet valves and low-pressure accumulators, wherein the low-pressure accumulators accommodate, at least in part, pressure fluid that is discharged from wheel brakes in a control operation, wherein the hydraulic pumps are used to return the pressure fluid into a master cylinder, in particular tandem master cylinder, wherein the delivery behavior of the hydraulic pumps is controlled in dependence on pressure values, and wherein the actuation of the hydraulic pumps takes place in conformity with demand, i.e. by evaluating slip variation, wherein in a pressure increase phase, the pressure fluid is intermediately stored in the low-pressure accumulators and there is no return delivery of the pressure fluid into the master cylinder until either a pressure increase phase or pressure buildup commences, or a critical filling level of the low-pressure accumulator necessitates actuation of the hydraulic pumps for safety reasons, with the result of balancing the volume flow demand and the delivery volume flow and thus achieving a reduction of vibrations of the brake pedal. Further, the invention relates to a computer program product defining an algorithm that comprises a method for improving the control behavior of motor vehicle control systems.

Method for improving the regulatory behavior of motor vehicle regulatory systems

The present invention relates to a method for regulating a predetermined modifiable brake pressure in the wheel brakes of a brake system, wherein input quantities determining the brake pressure in the individual wheel brakes are evaluated and correcting variables of hydraulic valves are defined in a control and/or data processing system. To obviate the need for additional pressure sensors which register the pressure in the wheel brakes, it is arranged for by the invention that a characteristic curve is stored in the control or data processing system, said curve correlating the valve characteristics of the hydraulic valve with a pressure difference of the hydraulic valve, and the correcting variable of the hydraulic valve is defined according to the characteristic curve.

Method for regulating a predetermined modifiable brake pressure

In a method for improving the operation of a hydraulic vehicle brake system with an active hydraulic brake boost, wherein a pressure fluid volume flow between a master brake cylinder and the wheel brakes of the vehicle is controlled by means of an analog or analogized separating valve, and wherein a hydraulic pressure is determined in the master brake cylinder, an increase of the hydraulic pressure in the master brake cylinder is monitored and/or controlled on the basis of the hydraulic pressure determined in the master brake cylinder in a transition of the separating valve from a closed switch position to an open switch position.

Method for improving the operation of a braking system

A method of improving the control performance of a traction slip control system so that faulty control activations of the TCS control system are prevented in critical situations such as driving downhill. The invention concerns a method wherein a vehicle reference speed and a vehicle deceleration signal are derived from the rotational behavior of the vehicle wheels and wherein a vehicle deceleration signal is obtained by way of a longitudinal deceleration sensor. The course of the two deceleration signals is compared and analyzed for detecting stable or unstable wheel rotational behavior. Preferably a difference signal is formed indicating the difference between the two deceleration signals. The difference signal is evaluated by a multistage filter arrangement.

Method of improving the control response of an automatic slip control system

A detection device for detecting braking of a vehicle during cornering on a road surface where the coefficient of friction of the road surface on a wheel on the outside of a curve is lower than on a wheel on the inside of the curve includes a comparison device for comparing the brake force or the brake force reduction of at least one wheel on the outside of a curve with the brake force or the brake force reduction of at least one wheel on the inside of the curve, and a device for generating a detection signal or initiating appropriate measures when the brake force of at least one wheel on the outside of a curve is lower or reduced to a greater degree than the brake force of at least one wheel on the inside of the curve. A device for influencing yaw torques has a so-called detection device and a reduction device which reduces the brake force in a brake of a wheel on the inside of a curve.

Method and device for detecting a braking situation

A method is provided for determining correction values for the wheel speeds of a vehicle, comprising the step of determining the speeds of the vehicle wheels during travel, with the speeds of the vehicle wheels being evaluated, in groups, for at least one vehicle axle and at least one vehicle side values of correction for the individual vehicle wheels being determined in accordance with the evaluation results. Moreover, a device is provided for determining corection values, comprising wheel sensors for determining the speeds of wheels of the vehicle during travel, and a determining means evaluating the speeds of the vehicle wheels, in groups, for at least one vehicle axle and at least one vehicle side, and determining correction values for the individual vehicle wheels in accordance with the results of evaluation.

Method and device for determining correction values for wheel speeds

A method for controlling an anti-lock braking system, intended for motor vehicles having all-wheel drive, electric signals representative of the rotational behavior of the vehicle wheels are produced and logically combined. When a locking tendency occurs, the braking pressure is controlled, and the instantaneous wheel slip, the wheel acceleration, and the wheel deceleration are evaluated as control criteria, and wherein the individual wheel speed is compared to a vehicle reference speed which is used as a reference quantity for controlling the braking pressure. In the event of a wheel rotational behavior that is typical of a spinning tendency and is revealed by a rise of the vehicle reference speed in excess of the actual vehicle speed, the control concept is modified up to a defined point of time in that the instantaneous wheel slip is left out of account as a control criterion for this spinning phase and the braking pressure control becomes dependent on merely the wheel acceleration or the wheel deceleration.

System for controlling an anti-lock braking system for motor vehicles having all-wheel drive

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Ralph Gronau