Braking system for motor vehicles

Details Braking system for motor vehicles Braking system for motor vehicles

1999-10-29

2001-04-03

Butler, Douglas C. (Department: 3613)

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

C188S356000, C303S113400, C303S119200

Reexamination Certificate

active

06209968

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a brake system for motor vehicles with an actuating unit that is made up of a pneumatic brake force booster as well as a master brake cylinder located downstream of the booster, with such master brake cylinder having wheel brakes connected to it, wherein the control valve of the brake force booster can be actuated independently of the driver's actions by means of an electromagnet, whose armature can actuate one of the control valve's sealing seats, and with a brake pressure controller, to which a signal corresponding to a nominal brake pressure and a signal corresponding to the actual brake pressure are supplied and whose output variable corresponds to a nominal value of the electric current to be supplied to the electromagnet.
This type of brake system is known from the international patent application WO 95/03196. In the known system the output variable of the brake pressure controller, which corresponds to a nominal path of the electromagnetic armature, is compared with a signal that corresponds to the actual path of the electromagnetic armature, whereby a control difference corresponding to the result of the comparison is supplied to a position controller that affects the position of the control valve and whose output variable represents the electric current to be supplied to the electromagnet.
A less advantageous feature of the known system is the necessity of using a position controller that has to be able to realize very short cycle times and, hence, has a complicated structure and is very expensive. The displacement sensor, which is needed to sense the actuating path of the electromagnetically actuatable sealing seat, is another cost factor.
Consequently, it is the object of the present invention to propose measures, by means of which the above-mentioned system components could be eliminated and, consequently, considerable price reductions could be achieved.
SUMMARY OF THE INVENTION
According to the present invention, this object is achieved in that the brake pressure controller is formed by connecting in parallel an electromagnetic control circuit that processes the nominal brake pressure signal into a first current value and a regulating circuit that processes a control difference formed from the nominal brake pressure signal and the actual pressure signal into a second current value, with the output variable of the brake pressure controller being formed by adding together the two current values.
Additional details, characteristic features and advantages of the invention are described below on the basis of an example, with reference to the attached drawing, where corresponding elements are designated by the same reference numbers.


REFERENCES:
patent: 3636140 (1988-04-01), None
patent: 4324205 (1995-01-01), None
patent: 4409909 (1995-09-01), None
patent: 19515051 (1996-05-01), None
patent: 19505114 (1996-08-01), None
patent: 19508822 (1996-09-01), None
patent: 93/24353 (1993-12-01), None
patent: 95/03196 (1995-02-01), None
patent: 9717239 (1997-05-01), None
Search Report of the German Patent Office for Application 196 24 376.9.

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