Abstract: 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.

Abstract: 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.

Abstract: 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 ?-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.

Abstract: A method for operating a brake system for motor vehicles comprises in a normal control mode of the system, a displacement of a piston for a pressure supply device is terminated, and inlet valves of the wheel brakes are closed in the event of a specified brake condition. The normal control mode is switched to a special control mode in the event of a specified condition for the pressure supply device. In the event of the specified brake condition in the special control mode, a displacement of the piston of the pressure supply device is terminated by outputting an actuation signal to the pressure supply device, and for at least one selected wheel brake, the corresponding inlet valve is kept open and the corresponding outlet valve is opened at least temporarily while the inlet valves of the remaining wheel brakes are closed.

Abstract: A method for operating a brake system for motor vehicles comprises in a normal control mode of the system, a displacement of a piston for a pressure supply device is terminated, and inlet valves of the wheel brakes are closed in the event of a specified brake condition. The normal control mode is switched to a special control mode in the event of a specified condition for the pressure supply device. In the event of the specified brake condition in the special control mode, a displacement of the piston of the pressure supply device is terminated by outputting an actuation signal to the pressure supply device, and for at least one selected wheel brake, the corresponding inlet valve is kept open and the corresponding outlet valve is opened at least temporarily while the inlet valves of the remaining wheel brakes are closed.

Abstract: 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.

Abstract: 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.

Abstract: 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 ?-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.

Abstract: 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.

Abstract: 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.

Abstract: Method for determining a model upstream pressure (PTMC—mod) using a mathematical model in a motor vehicle brake system. An electrically controllable hydraulic valve (7a, 7b) control brake pressure on a wheel brake. Wheel sensors (10a, 10b) provide a vehicle speed signal. From the vehicle speed signal (vref) generating at least a first low pass filtered vehicle speed signal (Vref—fast, Vref—hard, Vref—soft) for using with a first limit frequency (fg1, fg2, fg3), from whose time profile the point in time (t1) of a significant decrease is detected, used for determining a time duration (Timer) starting with deceleration of the vehicle, which ends at the onset of regulation of the braking process. For the classification of the actuation speed of the brake pedal (16) the time duration (Timer) is compared with one or more threshold values (SW1, SW2). Depending on the comparison, determining a model upstream pressure (PTMC—mod) using the mathematical model.

Abstract: Method for determining a model upstream pressure (PTMC—mod) using a mathematical model in a motor vehicle brake system. An electrically controllable hydraulic valve (7a, 7b) control brake pressure on a wheel brake. Wheel sensors (10a, 10b) provide a vehicle speed signal. From the vehicle speed signal (vref) generating at least a first low pass filtered vehicle speed signal (Vref—fast, Vref—hard, Vref—soft) for using with a first limit frequency (fg1, fg2, fg3), from whose time profile the point in time (t1) of a significant decrease is detected, used for determining a time duration (Timer) starting with deceleration of the vehicle, which ends at the onset of regulation of the braking process. For the classification of the actuation speed of the brake pedal (16) the time duration (Timer) is compared with one or more threshold values (SW1, SW2). Depending on the comparison, determining a model upstream pressure (PTMC—mod) using the mathematical model.

Abstract: A correction method in which characteristic curves and/or correction values are produced, by way of which the drive current for one or more electrically activated hydraulic values operated in an analog fashion is measured during a pressure regulation in such a way that, during the operation of an anti-lock regulation, one or a respective characteristic curve is first prescribed and then the prescribed characteristic curve is corrected, particularly in a learning process, wherein, after a pressure build-up phase, the current pressure model value (Pmod) is compared to and/or analyzed using a model locking pressure level (Pmax).

Abstract: 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.

Abstract: A method shall render it possible that an especially favorable pilot control can be achieved with an electrically controllable hydraulic valve (10), in particular an analog/digital inlet valve of a friction brake of a motor vehicle brake system. To this end, an actuating current is applied to the hydraulic valve (10), which is determined by linking an available opening current characteristic curve (Iopen(?P)table) of the hydraulic valve (10) to a correction value (igrad), with the correction value (igrad) being predetermined depending on a number of parameters that are characteristic of the hydraulic valve (10).

Abstract: A motor vehicle brake system having a hydraulic cable, via which a wheel brake module can be pressurized by a brake medium using brake pressure from a brake cylinder and to which a low pressure accumulator is connected for temporarily receiving excess brake medium, wherein the low pressure accumulator is connected to the hydraulic cable via a backflow line and a return pump interposed in the return line in order to return temporarily stored brake medium, the return pump being cyclically actuated for adjusting the pump capacity such that an activation occurs within each braking cycle during a portion of pump cycles that corresponds to the pump capacity, is intended to provide particularly high operational safety while also providing a comfortable pedal sensation.

Abstract: 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.

Abstract: A correction method in which characteristic curves and/or correction values are produced, by way of which the drive current for one or more electrically activated hydraulic values operated in an analog fashion is measured during a pressure regulation in such a way that, during the operation of an anti-lock regulation, one or a respective characteristic curve is first prescribed and then the prescribed characteristic curve is corrected, particularly in a learning process, wherein, after a pressure build-up phase, the current pressure model value (Pmod) is compared to and/or analyzed using a model locking pressure level (Pmax).

Abstract: A motor vehicle brake system having a hydraulic cable, via which a wheel brake module can be pressurized by a brake medium using brake pressure from a brake cylinder and to which a low pressure accumulator is connected for temporarily receiving excess brake medium, wherein the low pressure accumulator is connected to the hydraulic cable via a backflow line and a return pump interposed in the return line in order to return temporarily stored brake medium, the return pump being cyclically actuated for adjusting the pump capacity such that an activation occurs within each braking cycle during a portion of pump cycles that corresponds to the pump capacity, is intended to provide particularly high operational safety while also providing a comfortable pedal sensation.

Abstract: A method shall render it possible that an especially favorable pilot control can be achieved with an electrically controllable hydraulic valve (10), in particular an analog/digital inlet valve of a friction brake of a motor vehicle brake system. To this end, an actuating current is applied to the hydraulic valve (10), which is determined by linking an available opening current characteristic curve (Iopen(?P)table) of the hydraulic valve (10) to a correction value (igrad), with the correction value (igrad) being predetermined depending on a number of parameters that are characteristic of the hydraulic valve (10).