Daimler Chrysler Ag

Mercedes-Benz Aktiengesellschaft

Daimler Ag

Temic Telefunken Microelectronic Gmbh

Wolfgang Kiesewetter

Manfred Steiner

Bernd Knoff

Lorenz Maack

Alexander Fuchs

Eberhard Pfeifle

Carsten Lauer

Joachim Nell

Werner Reichelt

Franz Brugger

Siegfried Rump

Albrecht Eckl

Reinhard Helldorfer

Christoph Steffi

Brian Douglas

Thomas Just

Frank Schlosser

Adam Weimann

Joerg Burghardt

Bernd Gebhart

Heinz Eyyinger

Jan Kipping

A method for monitoring the pressure of motor vehicle tires is provided. In the method, a tire pressure value of the tire filling pressure and a tire temperature value are determined. While taking into account the tire temperature value, the determined tire pressure value is compared with a stored nominal value and the comparison result is used to determine whether the motor vehicle tire is at an incorrect tire pressure, in particular, a low tire pressure. If the tire pressure is incorrect when a characteristic change in the tire pressure occurs, the stored nominal value is replaced by a new nominal value, and the comparison result is used to determine the new nominal value of the determined tire pressure value.

Method for monitoring the pressure of motor vehicle tires

A brake system for a vehicle is equipped with a brake servo assistance unit for the automatic generation of brake force and with at least one sensor for the generation of a measuring signal. This signal represents an activity on the part of the driver and can be fed to a brake pressure control unit. An activation control signal for the actuation of the brake servo assistance unit can be generated should the measuring signal lie within an activation value range. In order to improve operating reliability, at least two sensors are provided for measurement of an activity on the part of the driver, and an activation control signal can be generated should the measuring signals from the sensors each exceed a reference value.

Brake system for a motor vehicle

In a method for carrying out an automatic braking operation in a vehicle, a stte variable for describing driver's reactions and/or events outside the vehicle is sensed by means of a sensor, compared with a reference value and, when the reference value is exceeded, a higher braking pressure than the braking pressure corresponding to the brake pedal position is generated. In order to increase reliability, the automatic generation of braking pressure is suspended for a specific holding time if the state variable which is sensed by sensor means lies outside an acceptable tolerance range.

Method for automatic braking of a vehicle

A method for determining an initiation threshold value for an automatic braking process, in which an automatic braking process is used and a brake pressure is produced which is greater than the brake pressure which corresponds to the operation of the brake pedal by the driver. Short distances between vehicles increase the risk of accidents. If a driver operates the brakes when there is a short distance between the vehicle and the preceding vehicle, in the vast majority of cases, the driver of the following vehicle is often required to perform an emergency braking due to the short distance between the vehicles. To improve the safety of vehicles, an emergency braking is performed, as quickly as possible, when the distance between vehicles is short. This emergency braking, within what is physically possible, ensures rapid deceleration of the vehicle and thus helps to avoid rear-impact accidents. While performing the automatic braking process, the method incorporates a reduction of the initiation threshold value if it is determined that the distance to a preceding vehicle is less than a predetermined limit.

Method for determining an initiation threshold value for an automatic braking process

A process and device are disclosed for preventing a vehicle from colliding with an obstacle during parking. The object of the invention is therefore to ensure that a collision can be reliably avoided without any additional intervention of the drive. In a device with at least one sensor for generating signals which represent the distance between the vehicle and an obstacle, the signals are processed in an evaluation unit. When at least one distance-representing signal falls below a limit value, a warning signal is generated. This warning signal drives a control valve which generates a pressure difference between the working chamber and the vacuum chamber in a brake booster when the warning signal is generated. This pressure difference causes the braking pressure to rise in the wheel brake cylinder and therefore slows the vehicle down to a standstill.

Preventing the collision of a vehicle with an obstacle

The invention provides a method for determining a threshold value for triggering an automatic brake application wherein a braking pressure greater than that corresponding to the position of the brake pedal is developed when the actuating speed of the brake pedal exceeds a triggering threshold value determined from a preset threshold value and a vehicle-specific correction factor. According to the invention, a standard curve is stored representing the relationship between the vehicle deceleration and the pedal travel, said standard curve having a pedal travel value sP0 for a vehicle deceleration aFZG0=0 m/s.sup.2. During a brake application, pairs of values for pedal travel and vehicle deceleration are determined several times, with a pedal travel value sPi0 being determined for a vehicle deceleration of 0 M/s.sup.2 corresponding to each value pair, based on a curve that is the same as the standard curve. A sliding average sPm is then calculated from the values of sPi0 obtained, and the relative deviation ABW=sPm/sP0 is then determined from the value sP0 as a vehicle-specific correction factor ABW. The triggering threshold value is then determined as a function of the product of the preset threshold value VS and the vehicle-specific correction factor ABW.

Method for determining a triggering threshold value for an automatic

In a method for controlling the braking process of a motor vehicle, nonlinear boosting of the braking force is performed if the actuating speed of the brake pedal exceeds a specified trigger threshold value. This trigger threshold value is formed as a function of the instantaneous speed of the motor vehicle, the pedal position of the brake pedal or a variable directly proportional thereto, and of a motor vehicle specific, brake dependent correction value.

Method for controlling the braking process in a motor vehicle

A method is provided for determining the start and the end of an automatic braking process to optimize the triggering of the automatic braking process. When a set value is exceeded, an automatic braking process is triggered. The threshold value is changed as a function of the driving state, in particular, as a function of the speed of the vehicle when the brake pedal is actuated, and independently thereof, as a function of the position of the brake pedal. In addition, various criteria terminate the automatic braking process as a function of the actuation force of the brake pedal, of the speed of the vehicle and of the pedal travel.

Method for optimizing triggering of an automatic braking process

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Altdorf, Germany

Wolfgang Kiesewetter