Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Patent
1998-03-02
1999-11-23
Cuchlinski, Jr., William A.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
701 71, 701 83, 701 78, 188152, 188141, 303 3, 180244, B60K 2816, B60T 832
Patent
active
059916818
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a brake system for automotive vehicles including a controllable pneumatic brake power booster and a master brake cylinder, wherein a control valve of the brake power booster is operable by an actuating pedal, on the one hand, and is actuatable by a solenoid irrespective of the driver's wish, on the other hand, including an arrangement for determining the actuating force applied to the actuating pedal, and an electronic controller having control signals which are used to activate the solenoid.
In a combined actuation of the brake power booster by independent activation and by the actuating force applied to the actuating pedal, it is necessary to know about the actuating force in some possible applications, for example, in driving stability control operations.
German patent No. 33 25 854 discloses a brake controller for controlling a vehicle brake system which interacts with a brake power booster that is activatable irrespective of the driver's wish, preferably electrically. The mentioned electric activation is done by way of a control valve which is arranged outside the brake power booster and takes effect on a pneumatic differential pressure adapted to be introduced in the booster housing. The control valve is furnished with control signals of a data processing system which processes, as input quantities, signals from two sensor assemblies. The first sensor assembly includes a speed sensor having signals which are differentiated to determine the vehicle deceleration. The second sensor assembly is a force sensor which is used to determine the actuating force applied to the actuating pedal. The data processing system has static characteristic curves from which nominal deceleration values are derived.
A disadvantage of the prior art controller is the use of the force sensor for determining the above mentioned actuating force. The force sensor must be installed in the actuating rod of the brake power booster. Installation of the force sensor requires sophisticated structure, on the one hand, and involves problems, on the other hand, which are due to a limited mounting space.
Therefore, an object of the present invention is to provide measures which permit indirectly determining the actuating force that acts upon the actuating pedal.
SUMMARY OF THE INVENTION
According to the present invention, this object is achieved because the assembly includes a first sensor for determining the hydraulic pressure introduced into the master brake cylinder, a second sensor for determining the pneumatic differential pressure introduced into the brake power booster, and the electronic controller which calculates a third signal, representative of the actuating force, from the signals sent by the sensors.
The third signal is calculated preferably pursuant the relation A(bW)-F(Stor) master cylinder piston, cylinder, brake power booster, boosting force of the brake power booster, and in the system.
BRIEF DESCRIPTION OF THE DRAWINGS
The only FIGURE in the drawing shows a schematic view of a brake system design according to the present invention.
DETAILED DESCRIPTION OF THE DRAWINGS
The automotive vehicle brake system of the present invention, shown only schematically in the drawing, includes an actuating unit 1 and an electronic controller 6. The actuating unit 1 has a pneumatic brake power booster, preferably a vacuum brake power booster 2, which is operable by an actuating pedal 4. Vehicle brakes (not shown) are connected to pressure chambers (not shown) of the master brake cylinder, preferably a tandem master cylinder 3 connected downstream of booster 2, by hydraulic lines 9, 10. An actuating rod 5 is coupled to the actuating pedal 4. Rod 5 permits actuating a control valve 19 (shown only schematically) which controls the build-up of pneumatic differential pressure in the housing of the vacuum brake power booster 2. A solenoid 20, activatable by control signals of the electronic controller 6, renders possible actuation of the control valve 19 independently of t
REFERENCES:
patent: 5499049 (1996-03-01), Every
patent: 5662388 (1997-09-01), Wuerth et al.
patent: 5720534 (1998-02-01), Stumpe
Bill Karlheinz
Klesen Christof
Semsch Martin
Cuchlinski Jr. William A.
Hernandez Olga
ITT Manufacturing Enterprises Inc.
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