BRAKE SYSTEM HAVING A PRESSURE MODEL AND PRIORIZATION DEVICE

• US 20120306261A1
• Filed: 02/11/2011
• Published: 12/06/2012
• Est. Priority Date: 02/13/2010
• Status: Abandoned Application

• Current Assignee: IPGATE AG
• Original Assignee: IPGATE AG
• Inventors: Leiber, Heinz, Van Zanten, Anton, Koeglsperger, Christian
• Application Number:
  US13/577,342
• Publication Number:
  US 20120306261A1
• Time in Patent Office: Days
• US Class Current: 303/146
• CPC Class Codes: B60T 13/745 acting on a hydraulic system, e.g. a master cylinder
• CPC Class Codes: B60T 8/4077 Systems in which the booster is used as an auxiliary pressure source

Abstract

A brake system may include a brake booster, the piston-cylinder system of which is driven mechanically or hydraulically by an electric motor, in particular by means of transmission means, at least one working chamber of the piston-cylinder system being connected to at least two wheel brakes via hydraulic lines, each wheel brake being associated with a 2/2 distribution control valve and the hydraulic connecting lines between the wheels brakes and the piston-cylinder system being selectively disconnectable or jointly closable by means of the 2/2 distribution control valves such that in the wheel brakes a pressure can be adjusted consecutively in terms of a multiplex method and/or simultaneously, the electric motor and the control valves being actuated by a regulating device, characterized in that the regulating device calculates the respective pressure in the wheel brakes by means of a pressure model and transmits the calculated pressure values to at least one ABS-ESP regulator and to a pressure regulating device, wherein the pressure regulating device actuates at least the 2/2 distribution control valves and the electric motor, and a prioritization device performs a wheel selection on the basis of the data transmitted by the ABS/ESP regulator and transmits it to the pressure regulating device.

Claims

1. A brake system including:

a brake booster, including a piston-cylinder system driven mechanically or hydraulically by an electric motor the piston-cylinder system including at least one working chamber, wherein at least one working chamber of the piston-cylinder system is connected via hydraulic lines to at least two wheel brakes;

2/2-way switching valves associated respectively with wheel brakes, wherein the hydraulic connecting lines between the wheel brakes and the piston-cylinder system are closable or are closed as desired separately or jointly by means of the 2/2-way switching valves to adjust a pressure in the wheel brakes in succession in the sense of a multiplex method and/or simultaneously;

a controlling device coupled to actuate the electric motor and the switching valves, wherein the controlling device is configured to calculate, by means of a pressure model, one or more respective pressures in the wheel brakes, wherein the and the one or more calculated pressures are transmitted at least to an ABS/ESP controller and to a pressure controlling device, wherein the pressure controlling device is configured to actuate at least the 2/2-way switching valves and also the electric motor; and

a prioritisation device configured to perform a wheel selection at least on the basis of data transmitted by the ABS/ESP controller and to transmit the wheel selection to the pressure controlling device.

2. The brake system according to claim 1, the ABS/ESP controller is configured to determine at least one target pressure and/or pressure change for the wheels and wheel brakes on the basis of sensor signals and the one or more pressure values based on the pressure model.

3. The brake system according to claim 1, further comprising a computer configured to simulate the pressure model, the ABS/ESP controller and the pressure control and to perform the respective calculations.

4. The brake system according to claim 1, wherein the pressure model is configured to calculate the one or more pressures on the basis of a pressure in the at least one working chamber of the piston-cylinder system, on the basis of the piston position, or on the basis of the pressure and the piston position.

5. The brake system according to claim 4, wherein the pressure controlling device is configured to adapt parameters of the pressure model on the basis of a temperature measured in the brake system or on the basis of temperatures measured at specific points in the brake system.

6. The brake system according to claim 1, wherein the prioritisation device is configured to perform prioritisation of the wheel selection on the basis of “

optimal braking distance” and

/or “

stability of the regulation”

.

7. The brake system according to claim 1, wherein in the event of a directly occurring pressure reduction in one or more wheel brakes, the prioritisation device does not allow simultaneously a pressure build-up in one or more wheel brakes, and vice versa.

8. The brake system according to claim 1, wherein in the event of a wheel slip greater than a predetermined slip limiting value and/or with a wheel acceleration or deceleration greater than +/−

10 G, the prioritisation device is configured to switch to a simultaneous or partially simultaneous pressure build-up or pressure reduction.

9. The brake system according to claim 1, further comprising a second computing unit configured to perform a plausibility examination of the input signals, output signals and/or intermediate signals of the overall system and/or of the pressure model, ABS/ESP controller, prioritisation device and pressure controlling device.