Abstract: A method and a device for controlling a brake system of a vehicle, with an automatic braking action being triggered when a threshold value is exceeded. The threshold value is varied as a function of a quantity derived from the distance to an obstacle located in front of the vehicle.

Abstract: A method and a device for controlling a brake system of a vehicle, with an automatic braking action being triggered when a threshold value is exceeded. The threshold value is varied as a function of a quantity derived from the distance to an obstacle located in front of the vehicle.

Abstract: A method and/or a device for estimating pressure and/or volume changes in a hydraulic system having two peripheral volume storage vessels connected to a central volume storage vessel, in which, to increase the response rate, the estimate is based at least at times on a model in which a direct connection to the peripheral volume storage vessels is assumed, regardless of whether or not the peripheral volume storage vessels are simultaneously connected directly to each other.

Abstract: A method and a device are proposed for driving a solenoid valve that has stroke ranges of a stable equilibrium of forces and stroke ranges of an unstable equilibrium of forces. For setting the predetermined differential pressure across the solenoid valve, a driving signal quantity is generated which is selected such that the stroke ranges of an unstable equilibrium of forces are avoided or the dwell time of the solenoid valve in these ranges is reduced.

Abstract: Device and method for determining a wheel braking pressure and/or an admission pressure in a braking system in which pressure medium is introduced from a reservoir for the pressure medium having an admission pressure into a wheel brake through at least one shutoff device for inlet and/or outlet and/or passage of a pressure medium, it being possible to remove pressure medium from the wheel brake through at least one means delivering the pressure medium. In so doing, a pressure quantity representing the admission pressure is estimated, at least one operating state of at least one actuator in the braking system is detected and the wheel braking pressure is estimated as a function of the estimated admission pressure and the detected operating states.

Abstract: A brake pressure control device is described. The device includes a pneumatic brake booster which has at least two chambers that are separable from each other. At least one of the chambers can be operated as a low-pressure chamber and at least another one of the chambers can be oerated as a working chamber. The device further includes a master braking cylinder in which a master cylinder pressure is generated over the pneumatic brake booster, and a hydraulic unit, which is installed between the master cylinder and at least one wheel brake cylinder of at least one wheel. The hydraulic unit includes an arrangement of switchable valves as well as least one pump. A hydraulic boost of the brake pressure is achievable with the assistance of the hydraulic unit. A wheel brake cylinder pressure may be generated in the at least one wheel brake cylinder with the assistance of the hydraulic unit, the wheel brake cylinder pressure being greater than the master cylinder pressure.

Abstract: An apparatus for kinesthetic signaling to a driver of a motor vehicle is described. The apparatus signaling the driver if, in the context of a system for controlling vehicle speed, a deliberate shutdown or one occasioned by a malfunction is imminent or exists; or if, in the context of a system for controlling vehicle speed, a preset maximum deceleration value is not sufficient to prevent a collision between the motor vehicle and a preceding vehicle or an obstacle. The apparatus includes a device that modulates a braking setpoint, or a variable derived from it, in such a way that the motor vehicle experiences a temporally fluctuating deceleration that is perceptible by the driver.

Abstract: An inlet pressure effected by the driver is detected in the brake system, and a driver's wish value formed from this pressure is used as the basis for controlling the brake system. In the formation of the driver's wish value the measured pressure value is corrected according to control parameters including either status information for a return pump and associated values, or flow information such as volume change in the master cylinder.

Abstract: A method and device for estimating pressure changes within a hydraulic system having a first reservoir and at least one second reservoir connected to the first reservoir via valves, including the following steps: (a) specifying a pressure differential between the first and second reservoirs; (b) calculating a volume exchanged within a specified time interval between the first and second reservoirs via the valve, on the basis of a value for the pressure differential that is valid at the start of the time interval; (c) calculating a volume to be exchanged between the two reservoirs to achieve equal pressures in them; (d) if the amount of the exchanged volume calculated in step (b) is greater than the volume to be exchanged as calculated in step (c), replacing the value of the exchanged volume with that of the volume to be exchanged; and (e) adopting the volume value obtained in step (d) as the change in the volume in the second reservoir and determining the pressure change in the reservoirs on the basis of

Abstract: A deceleration regulator which generates a nominal deceleration value, preferably a PID controller, can be adapted to the requirements of the brake engagement. A guidance magnitude filter is used, a preliminary control dependent on the nominal deceleration is performed, and the integral component of the regulator is activated only in certain states of operation. In certain courses of the nominal value, a portion of the regulator is corrected.

Abstract: A method and a device for determining a pressure variable, in particular in a braking system having a delivery pump. The differential pressure between a first line and a second line is determined using as a baseline a variable which represents a measure for the speed of the delivery pump.

Abstract: An acceleration signal is generated in a motor vehicle having acceleration and deceleration states. The signal generated is used in a vehicle control system. A first value, representing vehicle acceleration, is initially determined as a function of at least one value acquired by a sensor. Furthermore, a second value representing the instantaneous acceleration and deceleration state of the vehicle is determined. The magnitude of the first value determined is limited as a function of the second value determined. Then, the signal representing the vehicle acceleration is generated as a function of the limited first value.

Abstract: An operational state of a brake system is determined by detecting operating parameters such as actual vehicle acceleration, state of the brake light switch, vehicle velocity, inlet pressure at the master cylinder, and status of the ABS. A nominal value for vehicle deceleration is then determined based on the operation state of the vehicle. During a control phase, which may be switched on based on the rate of build-up of inlet pressure, the nominal value is determined independently of the magnitude of pedal actuation by the driver.

Abstract: A method and device for driving an electromagnetic valve, in particular an electromagnetic valve of a braking system having antilock protection and/or a traction control system. When switched over into the position that permits the passage of flow, the valve is so driven that, in a first phase for a specifiable time (DT), the current falls off in accordance with a first function and remains nearly constant over time in a second phase.

Abstract: A process and an apparatus are provided for controlling the brake system of a vehicle. A desired value representing the vehicle deceleration is formed depending on a depression signal derived from actuation of the brake pedal by the drive, and additionally depending on the rate of change that signal. The actual vehicle deceleration is compared to the desired value and the vehicle is automatically braked when the actual deceleration deviates from the desired value.

Abstract: When a threshold value is exceeded by the rate of change in the input pressure, an automatic braking operation is initiated. The threshold value becomes lower as the potential for danger increases.

Abstract: In a method and device for identifying a pressure variable, in particular in a brake system, the pressure difference is estimated on the basis of a pressure gradient and the actuation duration of a solenoid valve.

Abstract: A solenoid valve control circuit for controlling an actuation current of a solenoid valve when the valve is to be adjusted from its flow-permitting position into its closed position so that the actuation current is initially adjusted to a value beyond the current value at which the valve begins to drop out. However, the actuation current is subsequently adjusted back to the range which lies between the current value at which the valve goes into the closed position and the current value at which the valve goes into its flow-permitting position.

Abstract: When a differential speed determined from the wheel speeds has superimposed thereon a frequency typical of drive train vibrations, a vibration signal is generated. When the vibration signal exceeds a threshold, a torsional moment based on the difference between the engine speed and the differential speed is used to modify activation times of the brake pressure control valves so that the drive train vibrations decay.