US 6,650,989 B2Granted

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

AssigneeContinental Teves AG & Co. oHG

InventorsRalph Gronau, Dieter Burkhard

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Abstract

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.

Claims23

Dependent claims

Method for controlling an anti-lock braking system, intended for motor vehicles having all-wheel drive, comprising the steps of:

generating electric signals representative of the rotational behavior of the vehicle wheels,
using said electric signals for deriving braking pressure control signals,
using said brake pressure control signals when a locking tendency occurs, to decrease the brake pressure or maintain a constant brake pressure for a predetermined period and then increasing the brake pressure, and wherein the wheel slip, the wheel deceleration, or the wheel acceleration are evaluated as control criteria,
comparing the individual wheel speed to a vehicle reference speed which is produced by taking into account the rotational behavior of all wheels and wherein the vehicle reference speed is used as a reference quantity for controlling the braking pressure of the individual wheels,
detecting wheel rotational behavior that is typical of a spinning tendency,
starting a modified control mode and maintaining said modified control mode for a defined period of time wherein in said modified control concept the instantaneous wheel slip is ignored as a control criterion for said defined period of time and merely the wheel acceleration or the wheel deceleration becomes decisive for generating said braking pressure control signals,
wherein the detection, or starting, or maintaining of the modified control mode is evaluated in accordance with a TCS signal.

4 more elements

Circuit arrangement for controlling an anti-lock brake system for motor vehicles, comprising:

sensors for generating electric signals representative of the rotational behavior of the vehicle wheels,
circuits for conditioning, processing, and logically combining the sensor signals and for generating braking pressure control signals in dependence on the slip and the deceleration or acceleration of the individual wheels,
circuits for producing a vehicle reference speed in dependence on the rotational behavior of the wheels and for comparing the instantaneous speed of the individual vehicle wheels with the vehicle reference speed, and
switching means for influencing the control in the event of tendencies to spinning, wherein for detecting a spinning tendency, the rise of the vehicle reference speed (vREF) in excess of a predetermined limit value is evaluated,
change-over means for entering into a modified control mode when a tendency to spin is detected and when predetermined start conditions are reached which are satisfied at least when a limit value of the vehicle reference speed is reached, and this tendency continues to last during a predetermined time period,
means for maintaining said modified control mode until predetermined exit conditions occur,
means for detecting, or starting, or maintaining the modified control mode according to a TCS signal.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/182,972Filed 2 Aug 2002
Priority: DE 100 05 0714 Feb 2000
Published: US 2003/0018425 A123 Jan 2003
Granted: 18 Nov 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B60T 8/1769
Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS: specially adapted for vehicles having…
B60T 8/172
Using electrical or electronic regulation means to control braking: determining control parameters used in the regulation, e.g. by calculations…
B60T 8/175
Using electrical or electronic regulation means to control braking: brake regulation specially adapted to prevent excessive wheel spin during…
B60T 2250/042
Vehicle reference speed; Vehicle body speed: reference speed calculation in ASR or under wheel spinning condition