Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Reexamination Certificate
1997-04-18
2001-03-27
Cuchlinski, Jr., William A. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
C701S071000, C701S082000, C303S003000, C303S169000, C303S068000, C303S090000
Reexamination Certificate
active
06208926
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method and an apparatus for controlling the brake system of a vehicle.
DE 195 26 659, to which U.S. application Ser. No. 08/663,677 corresponds, discloses a method and an apparatus for controlling the brake system of a vehicle, in which the braking force at the wheels is actively controlled during a braking event according to the way the brake pedal is actuated by the driver. A deceleration regulator is provided for control, and a nominal deceleration value for the vehicle is derived from the way in which the driver operates the brake pedal. This nominal deceleration value is converted by the regulator to a factor representing the braking moment to be applied to the wheel brakes. This factor is in turn adjusted preferably in a braking moment regulator by controlling the brake force at the wheel brakes (e.g., by controlling the brake pressure). In the preferred embodiment a PID (proportional-integral-differential) regulator is used as the this regulator.
The brake system itself has a great influence on the performance of the regulator since the way in which it increases and reduces the brake moment can be very different. In one preferred embodiment a hydraulic brake system is used in which the dynamic differences have an important influence on the controlling action.
DE 43 38 399 A1 discloses a driving speed regulator which on the basis of the difference between a nominal or target speed and the actual speed forms a target deceleration value which is the basis for intervention into the brake system of the vehicle toward sustaining the target speed.
For the brake control, it is desirable to have a driving speed regulator of this kind act on the same deceleration regulator. Due to the abrupt changes in the nominal value generated by the deceleration regulator, which in such a case occur in switching between the various value setting means, the controlling action of the deceleration regulator, and thus the action of the brake control itself, might be perceptibly impaired.
It is the object of the invention to offer a deceleration regulator for controlling the brake system of a vehicle, which is adapted to the requirements of automatic braking of the vehicle in various situations.
SUMMARY OF THE INVENTION
A deceleration regulator for controlling the brake system is offered, which adapts itself to different requirements of automatic deceleration.
It is especially advantageous that the dynamics of the engagement of the brakes are considerably improved by a preliminary control of the intervention factors given by the deceleration regulator. It is furthermore especially advantageous that, by controlling the integral component of the deceleration regulator, a decided improvement of control performance is achieved with regard to the dynamics of brake application. This improvement is seen especially in hydraulic brake systems. This eliminates any special adaptation of the regulator to the various time factors in brake systems.
Advantageously, furthermore, a structural changeover or command variable filter is used whereby, in the event of a change of the setting means (e.g., from the driving speed regulator to the brake pedal) the performance of the regulator is considerably improved. Any possible abrupt changes of nominal values result in no adverse effect on the regulator and its performance, so that in this operational situation the application of the brakes has no adverse effect on comfort.
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Derwant Abstract of DE 43 38 399 A (1994).
Wagner Jochen
Wiss Helmut
Cuchlinski Jr. William A.
Fulbright & Jaworski LLP
Hernandez Olga
Robert & Bosch GmbH
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