Braking system and method for dimensioning a braking system

Patent metadata

Field	Value
Publication number	US-9566965-B2
Application number	US-201314653962-A
Country	US
Kind code	B2
Filing date	Nov 11, 2013
Priority date	Jan 3, 2013
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A method for dimensioning a component of a braking system; the braking system having at least two brake-circuit partial circuits; each brake-circuit partial circuit having at least one pump element for building up a brake-circuit pressure and/or for returning brake-circuit fluid in an ABS case, the pump elements of the at least two brake-circuit partial circuits being operable using a motor element; and the at least two brake-circuit partial circuits being separable using a separating element, so that different brake-circuit pressures may be created in the at least two brake-circuit partial circuits.

First claim

What is claimed is:

1. A method for dimensioning a component of a braking system that includes at least two brake-circuit partial circuits, each brake-circuit partial circuit having at least one pump element for at least one of building up a brake-circuit pressure and returning brake-circuit fluid in an ABS case, pump elements of the at least two brake-circuit partial circuits being operable using a motor element, and the at least two brake-circuit partial circuits being separable using a separating element, so that different brake-circuit pressures may be produced in the at least two brake-circuit partial circuits, the method comprising:
determining a first, defined operating point of a first operating state of the braking system, the first operating point including a first torque and a first speed of the motor element in the first operating state;
determining a second, defined operating point of a second operating state of the braking system, the second operating point including a second torque and a second speed of the motor element in the second operating state;
dimensioning the pump elements in such a way that in the second operating state, a shifted second operating point of the motor element arises, which is shifted along a motor characteristic curve of the motor element from the determined second operating point in a direction of the first operating point, whereby in a third operating state, an increase of a delivery capacity of at least one of the pump elements results such that a first volume flow rate of the at least one of the pump elements in the third operating state is increased to a second volume flow rate in the third operating state that is higher than the first volume flow rate.

2. The method as recited in claim 1 , wherein the shifted second operating point of the motor element in the second operating state essentially corresponds to the first operating point.

3. The method as recited in claim 1 , wherein the first operating point is an essentially extremal permissible operating point of the braking system, and wherein the second operating point is a permissible operating point of the braking system.

4. The method as recited in claim 1 , wherein in the first operating state, the at least two brake-circuit partial circuits are not separated, and wherein in the second operating state, the at least two brake-circuit partial circuits are separated using the separating element.

5. The method as recited in claim 1 , wherein the second operating state is an ABS operating state of the braking system.

6. A braking system for a vehicle, comprising:
a motor element;
at least two brake-circuit partial circuits, each brake-circuit partial circuit having at least one pump element for building up a brake-circuit pressure, the pump elements of the at least two brake-circuit partial circuits being operable using the motor element; and
a separating element for separating the at least two brake-circuit partial circuits, so that different brake-circuit pressures may be produced in the at least two brake-circuit partial circuits, wherein:
a first, defined operating point of a first operating state of the braking system is determinable, the first operating point including a first torque and a first speed of the motor element in the first operating state; and
a second, defined operating point of a second operating state of the brake circuit system is determinable, the second operating point including a second torque and a second speed of the motor element in the second operating state, and
the pump elements are dimensioned in such a way that a shifted second operating point of the motor element arises in the second operating state, which is shifted along a motor characteristic curve of the motor element from the determined second operating point in a direction of the first operating point, whereby an increase of a delivery capacity of at least one of the pump elements results in a third operating point such that a first volume flow rate of the at least one of the pump elements in the third operating state is increased to a second volume flow rate in the third operating state that is higher than the first volume flow rate.

7. The braking system as recited in claim 6 , wherein the shifted second operating point of the motor element in the second operating state essentially corresponds to the first operating point.

8. The braking system as recited in claim 6 , wherein the first operating point is an essentially extremal permissible operating point of the braking system, and wherein the second operating point is a permissible operating point of the braking system.

9. The braking system as recited in claim 6 , wherein in the first operating state, the at least two brake-circuit partial circuits are not separated, and wherein in the second operating state, the at least two brake-circuit partial circuits are separated using the separating element.

10. The braking system as recited in claim 6 , wherein the second operating state is an ABS operating state of the braking system.

11. The braking system as recited in claim 6 , wherein a first of the at least two brake-circuit partial circuits is associated with a front axle of the vehicle, and wherein a second of the at least two brake-circuit partial circuits is associated with a rear axle of the vehicle.

12. The braking system as recited in claim 6 , wherein the operating point of the motor element is determinable as a counter torque M of the motor element using the formula

M
=

M
fric

+

π
4

*
e
*

(

p
1

*

d
1
2

-

p
2

*

d
2
2

)

for friction torque M fric , eccentricity e of the at least one pump elements, and pressures p 1 and p 2 in first and second brake-circuit partial circuits of the at least two brake-circuit partial circuits, and
wherein the two pump elements are implemented as pump elements having diameter d1>d2, in particular d1=7.5 mm and d2=6 mm.

13. A vehicle, comprising:
a braking system, including:
a motor element;
at least two brake-circuit partial circuits, each brake-circuit partial circuit having at least one pump element for building up a brake-circuit pressure, the pump elements of the at least two brake-circuit partial circuits being operable using the motor element; and
a separating element for separating the at least two brake-circuit partial circuits, so that different brake-circuit pressures may be produced in the at least two brake-circuit partial circuits, wherein:
a first, defined operati

Assignees

• Bosch Gmbh Robert

Inventors

• Benzler Steffen
• Kunz Michael
• Strengert Stefan
• Druckenmueller Heiko

Classifications

• B60T2201/022

  Collision avoidance systems · CPC title

• B60T8/26

  characterised by producing differential braking between front and rear wheels {(using electrical circuitry or regulation means B60T8/17)} · CPC title

• B60T8/404 Primary

  Control of the pump unit · CPC title

• B60T8/4031 Primary

  Pump units characterised by their construction or mounting (pump units in combination with valve blocks B60T8/36) · CPC title

• B60T8/346

  2 Channel systems (B60T8/345 takes precedence) · CPC title