Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-02-12
1999-09-14
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188356, 3031143, 3031192, 303166, 303DIG4, 3031134, B60T 844, B60T 848, B60T 1372
Patent
active
059511192
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a brake system for motor vehicles using an actuation unit which can be actuated by an actuation pedal, the actuation unit consisting of a pneumatic brake booster and a master brake cylinder, to which the wheel brakes are connected, where the control valve of the brake booster can be controlled independently of the driver's will by means of a solenoid, by means of whose armature one of the sealing seats of the control valve can be actuated, with a brake pressure controller, which is supplied with a control difference from a desired brake pressure and an actual brake pressure and from whose output variable, corresponding to a desired armature travel, a signal is subtracted, which corresponds to the actual armature travel, and where the second control difference thus generated is applied to a positioning controller which influences the position of the control valve, where the output variable of the positioning controller corresponds to the electrical current which is to be applied to the solenoid.
Such a brake system is known from International Patent Application WO 95/03196. The mentioned document contains, however, no concrete indications how the brake system described therein could be used for a deceleration control, proportional to the force of actuation.
In German Patent DE 33 25 854 C2 a brake controller for the control of a vehicle brake system has been disclosed, which works in cooperation with a brake booster which can be controlled independently of the driver's will, preferably electrically. The mentioned electrical control occurs by means of a control valve, located outside of the brake booster, which influences a pneumatic difference pressure which can be applied to the amplifier housing and which receives control signals of a data processing installation which processes, as input variables, signals of two sensor setups. The first sensor setup consists of a velocity sensor, whose signals are differentiated to determine vehicle decelerations. The second sensor setup consists of a force sensor, which is used for the determination of the actuation force applied at an actuation pedal. The second sensor setup can be replaced, as selected, by a third sensor setup, which determines the initial force of the brake booster, which is proportional to the hydraulic pressure or brake pressure which is generated in a master brake cylinder which is connected after the brake booster. The data processing installation contains statistical parameter lines, from which the desired values of the deceleration are determined.
In the already known controller, a drawback results from the errors in the control which occur during rapid operation by the driver, as a result of the use of the statistical characteristic lines, and which do not correspond to the natural desired behavior of the brakes.
Therefore, the problem of the present invention is to propose measures which make it possible, in the generic brake system, to obtain a problem-free post-control as well as a more slow, and a more rapid, actuation process. In addition, the desired vehicle deceleration should be reached rapidly, independently of influences which lead to a decrease in the deceleration, such as, for example, additional loading of the vehicle, trailer operation, fading/frictional losses or slope drag force in the case of downward trips.
SUMMARY OF THE INVENTION
A first solution of the problem on which the invention is based includes an installation for the generation of a signal, which represents an actuation force applied at the actuation pedal and which is applied as an input variable to a prefilter, which contains a dynamic model of the actuation unit and whose output variable corresponds to the desired brake pressure, and in providing a pressure monitor, to which a signal representing the vehicle speed is applied, as input variable, which monitor contains a dynamic model of the parts of the brake system attached to the actuation unit and of the vehicle behavior, and whose output variable repres
REFERENCES:
patent: 3795426 (1974-03-01), Sisson
patent: 3856105 (1974-12-01), Lewis et al.
patent: 4512615 (1985-04-01), Kita et al.
patent: 4659153 (1987-04-01), Klech
patent: 5044700 (1991-09-01), Willmann
patent: 5150951 (1992-09-01), Leiber et al.
patent: 5178441 (1993-01-01), Heibal et al.
patent: 5201573 (1993-04-01), Leiber et al.
patent: 5248189 (1993-09-01), Izumi et al.
patent: 5261730 (1993-11-01), Steiner et al.
patent: 5342120 (1994-08-01), Zimmer et al.
patent: 5350224 (1994-09-01), Nell et al.
patent: 5350225 (1994-09-01), Steinere et al.
patent: 5367942 (1994-11-01), Nell et al.
patent: 5427442 (1995-06-01), Heibel
patent: 5454279 (1995-10-01), Castel et al.
patent: 5460074 (1995-10-01), Balz et al.
patent: 5605088 (1997-02-01), Balz et al.
patent: 5788337 (1998-08-01), Eckert
patent: 5816667 (1998-10-01), Jokic
Search Report of the German Patent Office Relating to Parent German Patent Application No. 195 14 382.5.
Butler Douglas C.
ITT Manufacturing Enterprises Inc.
LandOfFree
Braking system for motor vehicles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Braking system for motor vehicles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Braking system for motor vehicles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1502036