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Details for Patent: 5,599,076

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Details for Patent: 5,599,076

Title: Process for determination of friction/slip characteristics of the tires of a road vehicle and slip control system for carrying out the process
Abstract:A slip control system determines friction/slip characteristics of tires of a road vehicle equipped both with an antilock system to permit an individual brake pressure control on individual vehicle wheels. The front wheel brakes are connected to a primary output pressure space of the tandem master cylinder, and the rear wheel brakes are connected to a secondary output pressure space of the tandem master cylinder. A first bore stage of a housing of the tandem master cylinder forms a housing-defined boundary of the secondary output pressure space. An inner piston flange movably seals off a pressureless downstream chamber in relation to an inner portion of the first bore stage. An intermediate wall of the housing delimits the bore stage relative to a central bore stage which extends from a third bore stage receiving a primary piston. An actuating piston is displaceably guided in the central bore stage in a pressure tight manner and forms an axially movable, inner boundary of the primary output pressure space relative to a pressureless downstream chamber in the central bore stage which is bounded by the intermediate wall. An annular space is bounded in an axially movable manner by an inner piston flange of a secondary piston and by the intermediate wall and is connected to the pressure output of the controllable pressure source.
Inventor(s): Burckhardt; Manfred (Waiblingen, DE), Eilert; Gerd (Schwaikheim, DE), Freitag; Rainer (Nuertingen, DE), Mueller; Armin (Backnang, DE), Schoeb; Reinhold (Filderstadt, DE), Spiecker; Rainer (Kernen, DE), Kazan; Sinan (Esslingen, DE), Zimmer; Richard (Fellbach, DE)
Assignee: Mercedes-Benz AG (DE)
Filing Date:May 10, 1994
Application Number:08/256,250
Claims:1. A slip control system for carrying out a process for determining friction/slip characteristics of tires, on a road vehicle equipped both with an antilock system to permit an individual brake pressure control on individual vehicle wheels, comprising an apparatus for electronically controlled distribution of brake forces exertable via front wheel brakes and via rear wheel brakes, a braking device having a tandem master cylinder and a control pressure source with an electrically controllable output pressure configured to be coupled into a control pressure space of the tandem master cylinder and thereby additively superposed upon brake pressure generated by pedal actuation of the braking device alone and is further configured to be coupled into the rear wheel brakes, the control pressure source comprising an electronic control unit configured to generate control signals required for brake force distribution from processing at least wheel speed-of-rotation sensor output signals individually allocated to the vehicle wheels and pressure sensor output signals characteristic of generatable brake pressures wherein the front wheel brakes connected to a primary output pressure space of the tandem master cylinder and the rear wheel brakes are connected to a secondary output pressure space of the tandem master cylinder, a first bore stage of a housing of the tandem master cylinder, forming a housing-defined boundary of the secondary output pressure space, within which first bore stage a secondary piston with an outer piston flange delimits the secondary output pressure space in relation to a pressureless downstream chamber, an inner piston flange movably sealing off the downstream chamber in relation to an inner portion of the first bore stage, an intermediate wall of the housing delimiting the bore stage relative to a central bore stage which extends from a third bore stage receiving a primary piston, a cross-sectional area of the third bore stage is greater than a cross-sectional area of the central bore stage, an actuating piston being displaceably guided in the central bore stage in a pressure tight manner, the actuating piston forming an axially movable, inner boundary of the primary output pressure space relative to a pressureless downstream chamber in the central bore stage which is bounded by the intermediate wall, the actuating piston being provided with a thrust rod configured to axially penetrate the central downstream chamber and to pass displaceably in a pressure tight manner through a central bore of the intermediate wall and being axially supported on an inner piston flange of the secondary piston, an annular space which is bounded in an axially movable manner by the inner piston flange of the secondary piston and by the intermediate wall, centrally penetrated by the thrust rod and is connected to the pressure output of the controllable pressure source.

2. The slip control system according to claim 1, wherein an end portion of the thrust rod of the actuating piston engages at the secondary piston, and is operatively arranged in a blind bore of the secondary piston displaceably in pressure tight manner relative thereto and is supportable on a base of the blind bore.

3. The slip control system according to claim 2, wherein the inner piston flange of the secondary piston has a compensating bore opening centrally in the blind bore at the base and connects the blind bore with the downstream chamber.

4. The slip control system according to claim 2, wherein a secondary cylinder is provided between the output pressure space of the tandem master cylinder allocated to a front axle braking circuit of the braking system of the vehicle and a main brake line to the front wheel brakes, of the front axle braking circuit and acts as a pressure converter, the secondary cylinder having a control pressure space configured to be coupled with a controllable output pressure of the control pressure source which output pressure can be additively superposed upon the output pressure generatable in the output pressure space of the secondary cylinder solely by actuation of the master cylinder.

5. The slip control system according to claim 4, wherein a specifically associated control pressure output of the control pressure course is associated with the secondary cylinder.

6. The slip control system according to claim 2, wherein a pressure sensor is operatively connected to at least one of the pressure outputs, including a pressure output, of the primary output pressure space of the tandem master cylinder, and is configured to generate an electrical output signal characteristic of pressure in the tandem master cylinder and to feed the output signal to the electronic control unit.

7. The slip control system according to claim 1, wherein respective pressure sensors are operatively connected to the control pressure outputs of the control pressure source and are configured to generate electrical output signals characteristic of the control pressure available at the respective pressure output and to feed the output signals to the electronic control unit.

8. The slip control system according to claim 1, wherein respective pressure sensors are operatively associated with each of the front wheel brakes and with each of the rear wheel brakes and are configured to generate electrical output signals characteristic of the brake pressures prevailing in the wheel brakes and to feed the output signals to the electronic control unit.

9. The slip control system according to claim 1, wherein at least one of a transverse acceleration sensor and a yaw angle sensor is operatively arranged with the electronic control unit and configured to generate electrical output signals for evaluation by the electronic control unit in units of transverse forces acting on the vehicle.

10. The slip control system according to claim 1, wherein a force sensor is operatively associated with the electronic control unit and configured to generate an electrical output signal characteristic of a force with which the driver actuates a brake pedal of the braking system and to feed the output signal to the electronic control unit.
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