Pump system for generating a brake pressure

• US 6,179,389 B1
• Filed: 06/07/1999
• Issued: 01/30/2001
• Est. Priority Date: 06/05/1998
• Status: Expired due to Fees

• Current Assignee: Moog GmbH (Moog Incorporated), Daimler Chrysler Company LLC (Stellantis NV)
• Original Assignee: Moog GmbH (Moog Incorporated), Daimler Chrysler Company LLC (Stellantis NV)
• Inventors: Ringer, Franz, Duvenbeck, Michael, Müller, Armin, Freitag, Rainer, Tröster, Harry
• Primary Examiner(s): Butler, Douglas C.
• Application Number:
  US09/326,553
• Time in Patent Office: 603 Days
• Field of Search: 303/10, 303/2, 303/3, 303/115.4, 303/115.5, 303/116--11, 303/188, 303/113.5, 303/114.1, 303/114.2, 303/15, 303/146, 303/155, 303/113.4, 303/147, 605/472, 605/473, 605/48, 605/471, 605/49, 605/60, 188/358, 188/359, 701/41, 701/42, 137/505.18, 180/441, 180/422, 180/406, 180/305, 180/400, 180/403, 180/421, 180/442, 180/443, 913/71, 913/78, 914/45, 91/44, 914/59, 914/62
• US Class Current: 303/2
• CPC Class Codes: B60T 8/00 Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force by changing number of effective brake cylinders in power brake systems B60T17/10
• CPC Class Codes: B60T 8/18 responsive to vehicle weight or load, e.g. load distribution using electrical circuitry on regulation means B60T8/17; B60T8/30 takes precedence; responsive to weight and speed condition B60T8/58
• CPC Class Codes: B60T 8/328 Systems sharing components with other fluid systems onboard the vehicle
• CPC Class Codes: B62D 5/07 Supply of pressurised fluid for steering also supplying other consumers ; control thereof

Abstract

A system generates a brake pressure with a pump which delivers a volume into the chamber of a master brake cylinder and builds up a pressure which is used by at least one additional assembly, particularly a power-assisted steering system. The system has at least one distributing and throttling element for admitting a definable pressure to the chamber of the master brake cylinder and/or the additional assembly. The one or more distributing and throttling elements can be triggered, as a function of the brake pedal position and/or of driving condition values and/or of operating values of the vehicle, such that the chamber and/or the additional unit can be acted upon by a pump generated adjustable pressure.

Claims

1. A system for generating a brake pressure, comprising a master brake cylinder, a pump configured to deliver a volume into a chamber of the master brake cylinder and build up a pressure utilizable by at least one additional assembly, including a power-assisted steering system, and at least one distributing and throttling element configured to admit a definable pressure to at least one of the chamber of the master brake cylinder and the at least one additional assembly, wherein the at least one distributing and throttling element is configured to be triggerable as a function of at least one of brake pedal position, driving condition values and operating values of the vehicle, such that at least one of the chamber and the at least one additional unit is acted upon by an adjustable pressure generatable by the pump.

2. The system according to claim 1, wherein the distributing and throttling element comprises at least one controllable proportional valve through which the at least one of the chamber and the at least one additional assembly is acted upon by an adjustable pressure.

3. The system according to claim 1, wherein the distributing and throttling element is a controllably operable 4/3-way proportional valve having a first switching position in which the additional assembly is connected unthrottled with the pump, and the chamber of the master brake cylinder is connected with a fluid reservoir, a second switching position in which the chamber is connected unthrottled with the pump and the at least one additional assembly is controllably-throttled connected with the pump, and a third switching position in which the at least one additional assembly is connected unthrottled with the pump and the chamber of the master brake cylinder is controllable-throttled connected with the fluid reservoir.

4. The system according to claim 3, wherein the distributing and throttling element comprises at least one controllable proportional valve through which the at least one of the chamber and the at least one additional assembly is acted upon by an adjustable pressure.

5. The system according to claim 1, wherein the distributing and throttling element comprises a 5/3-way valve having a first switching position in which the chamber and the at least one additional assembly are acted upon by pressure by way of a flow control valve in a throttled manner, a second switching position in which the additional assembly are acted upon by pressure in an unthrottled manner, and a third switching position in which the at least additional assembly and the chamber are acted upon by pressure in an unthrottled manner, and, a controllable 2/2-way flow control proportional valve is arranged in a line leading to the chamber and has an outlet connected with a fluid reservoir.

6. The system according to claim 5, wherein the distributing and throttling element comprises at least one controllable proportional valve through which the at least one of the chamber and the at least one additional assembly is acted upon by an adjustable pressure.

7. The system according to claim 5, wherein a delivery of the pump is controllably variable as a function of operating path of the master brake cylinder and of an extent of operation of the at least one additional assembly, including a turning velocity of a steering wheel of the power-assisted steering system.

8. The system according to claim 1, wherein at least one of the driving condition values and operating values of the vehicle comprise at least one of values of lateral wheel forces, normal wheel forces, longitudinal or lateral inclination of the vehicle, longitudinal or lateral acceleration, aerodynamic drag, lift forces and negative lifts of the vehicle, load condition of the vehicle, driving forces at the driven wheels of the vehicle, and longitudinal deceleration of the vehicle.

9. The system according to claim 1, wherein the pump is configured such that a vehicle pedal force/travel deceleration characteristic is adjustable by the controllably throttled introduction of volume deliverable by the pump into the chamber of the master brake cylinder.

10. The system according to claim 1, wherein the master cylinder is arranged such that brake force distribution is adjustable by a throttled volume introduceable into the chamber of the master brake cylinder as a function of forward or reverse driving of a vehicle.

11. The system according to claim 1, wherein a control unit is operatively arranged to trigger the distributing and throttling element as a function of brake pedal position and of the additional operating values of the vehicle and of driving condition values.

12. The system according to claim 11, wherein actual longitudinal vehicle deceleration is supplied to the control unit and compared with other operating values of the vehicle and with driving condition values, including a desired vehicle deceleration defined by a vehicle driver.

13. The system according to claim 12, wherein the distributing and throttling element comprises at least one controllable proportional valve through which the at least one of the chamber and the at least one additional assembly is acted upon by an adjustable pressure.

14. The system according to claim 12, wherein the distributing and throttling element is a controllably operable 4/3-way proportional valve having a first switching position in which the additional assembly is connected unthrottled with the pump, and the chamber of the master brake cylinder is connected with a fluid reservoir, a second switching position in which the chamber is connected unthrottled with the pump and the at least one additional assembly is controllably-throttled connected with the pump, and a third switching position in which the at least one additional assembly is connected unthrottled with the pump and the chamber of the master brake cylinder is controllable-throttled connected with the fluid reservoir.

15. The system according to claim 12, wherein the distributing and throttling element comprises a 5/3-way valve having a first switching position in which the chamber and the at least one additional assembly are acted upon by pressure by way of a flow control valve in a throttled manner, a second switching position in which the additional assembly are acted upon by pressure in an unthrottled manner, and a third switching position in which the at least additional assembly and the chamber are acted upon by pressure in an unthrottled manner, and, a controllable 2/2-way flow control proportional valve is arranged in a line leading to the chamber and has an outlet connected with a fluid reservoir.

16. The system according to claim 12, wherein a delivery of the pump is controllably variable as a function of operating path of the master brake cylinder and of an extent of operation of the at least one additional assembly, including a turning velocity of a steering wheel of the power-assisted steering system.

17. The system according to claim 12, wherein at least one of the driving condition values and operating values of the vehicle comprise at least one of values of lateral wheel forces, normal wheel forces, longitudinal or lateral inclination of the vehicle, longitudinal or lateral acceleration, aerodynamic drag, lift forces and negative lifts of the vehicle, load condition of the vehicle, driving forces at the driven wheels of the vehicle, and longitudinal deceleration of the vehicle.

18. The system according to claim 12, wherein the pump is configured such that a vehicle pedal force/travel deceleration characteristic is adjustable by the controllably throttled introduction of volume deliverable by the pump into the chamber of the master brake cylinder.

19. The system according to claim 12, wherein the master cylinder is arranged such that brake force distribution is adjustable by a throttled volume introduceable into the chamber of the master brake cylinder as a function of forward or reverse driving of a vehicle.

20. The system according to claim 13, wherein the distributing and throttling element is a controllably operable 4/3-way proportional valve having a first switching position in which the additional assembly is connected unthrottled with the pump, and the chamber of the master brake cylinder is connected with a fluid reservoir, a second switching position in which the chamber is connected unthrottled with the pump and the at least one additional assembly is controllably-throttled connected with the pump, and a third switching position in which the at least one additional assembly is connected unthrottled with the pump and the chamber of the master brake cylinder is controllable-throttled connected with the fluid reservoir.