Continental Teves, Ag and Company Ohg

Henning Kerber

Mario Roszyk

Dieter Burkhard

Jochen Müller

Manuel Kasten

Arne Cornils

Markus Jäger

Roger-Lutz Müller

Jochen MÜLLER

The invention relates to a method for improving the control behavior of an electronic motor vehicle braking system which comprises at least a slip control function. Wheel dynamic information which is evaluated as a criterion for initiating a control intervention is used individually for each wheel and is compared with control thresholds for a pressure reduction phase, a pressure maintenance phase, and a pressure buildup phase for generating corresponding braking torques by means of a vehicle braking system. According to the invention, the expected acceleration change of a vehicle wheel is calculated from a pressure change at said wheel, said pressure change being caused by a control intervention; the actual acceleration change at the vehicle wheel, said acceleration change being caused by the pressure change, is determined from measured wheel speeds as wheel dynamic information; and the control behavior of the slip control is adapted when the actual acceleration change deviates from the expected acceleration change by a defined degree such that the deviation is minimized.

Method for improving the control behavior of an electronic motor vehicle braking system

A method for setting a slip threshold for a vehicle movement dynamics control device of a motor vehicle is provided. The method includes defining a slip threshold starting from which the vehicle movement dynamics control device is activated in order to reduce slip, and determining wheel-specific minimum slip values for the wheels of the motor vehicle, which slip values are derived from the respective wheel-specific slip signals. The method also includes detecting a geometric slip by correlating all the determined wheel-specific minimum slip values with one another, and evaluating the wheel-specific minimum slip values that are correlated with one another. The method also includes raising the slip threshold in the event of geometric slip being detected. The present disclosure also relates to a vehicle movement dynamics control device.

Method for setting a slip threshold and vehicle movement dynamics control device

The disclosure relates to a method for adapting a control strategy of a slip-control system of a brake system of a vehicle in a &#x3bc;-split situation, in which different wheel-specific brake pressures, are set at opposite wheels of a vehicle axle. The resulting brake pressure difference is limited. In some examples, to generate a brake pressure request, a maximum pressure difference value deviating from a reference pressure difference with a predefined tolerance value is determined on a wheel-specific basis for the wheels lying opposite one another. The reference pressure difference corresponds to the value of the current low-pass-filtered brake pressure difference, and the brake pressure request for each wheel is determined as a minimum of the wheel-specific brake pressure determined from the control strategy of the slip-control system, and from the sum of the average brake pressure of the wheel lying opposite and the wheel-specific maximum pressure difference value.

Method for adapting the control strategy of a slip-control system of a vehicle in a &#x3bc;-split-situation

A method for avoiding false excitations of a slip control system comprises monitoring of a wheel speed signal for a predefined first monitoring time period for the start of a negative half-wave of an oscillation applied to a vehicle wheel, when a brake pressure gradient initiated by a brake start rises above a predetermined threshold. A ruck signal is derived from the wheel speed signal. An acceration signal is derived from the wheel speed signal during a predetermined second monitoring period. The wheel speed signal is monitored for a turning point of the ruck signal and a start of the acceleration signal. The oscillation imposed on the vehicle wheel is identified as a braking-induced vibration, and slip control is not carried out when the turning point of the ruck signal and the re-acceleration of the wheel are detected.

Method for avoiding false excitations of a slip control system of a brake system of a vehicle

A method for determining the conditions of an underlying surface during unbraked or braked travel of a vehicle by a wheel-specific characteristic variable which is derived from a change over time in the wheel speed detected at at least one vehicle wheel. According to invention there is provision that a) a jolt signal is formed by double differentiation of the wheel speed, b) in order to form the characteristic variable the difference between the absolute value of the jolt signal and a tolerance value is summed or integrated over time, and c) the condition of the underlying surface is determined by comparing the characteristic variable with an oscillation signal threshold value.

Method for determining the conditions of an underlying surface during unbraked or braked travel of a vehicle

A method for operating a vehicle brake system and a corresponding vehicle brake system, particularly for motor vehicles. The vehicle wheels of the motor vehicle associated with an axle are at least partially driven by 'WV' an electric motor that can be operated as a generator during regeneration of braking energy, thus exerting a braking regeneration el torque on the respective axle. To prevent overbraking on the rear axle, the regeneration torque acting on at least one rear axle (HA) is limited such that the slippage present on the at least one vehicle wheel of the rear axle (HA) does not exceed or only negligibly exceeds a first slippage threshold individually associated with the respective vehicle wheel.

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Darmstadt, Germany

Henning Kerber