Fluid-pressure and analogous brake systems – Speed-controlled – Braking pressure demand or braking force desire
Patent
1997-02-10
1999-09-21
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Braking pressure demand or braking force desire
3031134, B60T 834
Patent
active
059544074
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process and device for controlling a brake system of a vehicle.
BACKGROUND INFORMATION
Such a process and such a device are known, for example, from U.S. Pat. No. 5,230,549 describes a conventional process and device, where a brake system with an electronic control unit actuates the wheel brakes as a function of the actuation of an operating element (brake pedal) by the driver. Actuation of the brake pedal is sensed both by a first sensor, which senses the actuation force and by a second sensor, which senses the path traveled by the pedal. For open- or closed-loop control of the brake system, a value for the driver brake command is formed from one of the measured quantities, in particular a setpoint for a control loop to actuate the brakes. The measured quantities such as actuating force or pedal path are selected according to the operating parameters such as deceleration or by the actual measured quantities. Since in this conventional process the braking effect of the brake system depends on the brake command, in the case of an error in sensing the brake command, in particular in sensing actuation, or in the case of an error in the electronic control unit itself, an undesired braking effect may be produced. No measures are described in U.S. Pat. No. 5,230,549 to detect an error or to control the brake system in the case of an error.
The object of the present invention is to provide measures to improve braking command detection in an open- or closed-loop control of the braking system of a vehicle with respect to possible error conditions.
SUMMARY OF THE INVENTION
The operating reliability of the brake system is ensured and error conditions in braking command detection are reliably identified by using three sensors to detect pedal actuation, each preferably operating via a different measuring principle.
This makes it possible to locate any errors and to perform open- or closed-loop control of the brake system without being limited by fail-safe elements, which results in considerable increase in the availability of the braking system.
It is also advantageous that a redundant measuring system with redundant processing channels is provided for determining the braking command.
An optional simple monitoring component with low accuracy requirements ensures location of a defective channel.
It is further advantageous to formulate equivalent values for the braking command in operating areas where an error condition cannot be located.
These measures according to the present invention are advantageously used in conjunction with all conventional measurement principles for pedal force and pedal path sensing, as well as with all conventional brake systems whether hydraulic, pneumatic, or electric, with or without emergency brakes.
The measures according to the present invention are also used in conjunction with braking force definition, vehicle deceleration definition, braking torque definition, braking power definition, braking pressure definition, etc., for open- and closed-loop brake control, i.e., for all defined parameters representing the braking effect.
It is further advantageous to design the open- or closed-loop control system with at least two microcomputers that are independent of one another.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of a first embodiment for determining a braking command according to the present invention.
FIG. 2 shows a block diagram of a second embodiment for determining the braking command according to the present invention.
FIG. 3 shows a block diagram of a computer system according to the present invention.
FIG. 4 shows a first diagram of a basic relationship of a pedal and braking command sensing on the basis of which the process according to the present invention operates.
FIG. 5 shows a second diagram of the basic relationship of a pedal and braking command sensing on the basis of which the process according to the present invention operates.
FIG. 6 shows a first flow chart of a process for ident
REFERENCES:
patent: 1952679 (1934-03-01), Leveen
patent: 4671576 (1987-06-01), Fourie
patent: 4784442 (1988-11-01), Petersen
patent: 5230549 (1993-07-01), Osada et al.
patent: 5572187 (1996-11-01), Williford
Blessing Peter
Keller Frieder
Kellner Andreas
Schramm Dieter
Oberleitner Robert J.
Robert & Bosch GmbH
Siconolfi Robert A.
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