Electrohydraulic brake system for motor vehicles

• US 20070108836A1
• Filed: 07/30/2004
• Published: 05/17/2007
• Est. Priority Date: 08/06/2003
• Status: Abandoned Application

• Current Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Original Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Inventors: Feigel, Hans-Jorg
• Application Number:
  US10/567,300
• Publication Number:
  US 20070108836A1
• Time in Patent Office: Days
• US Class Current: 303/115.100
• CPC Class Codes: B60T 13/165 Master cylinder integrated or hydraulically coupled with booster
• CPC Class Codes: B60T 8/368 combined with other mechanical components, e.g. pump units, master cylinders
• CPC Class Codes: B60T 8/4072 Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking

Abstract

Disclosed is an electrohydraulic brake system for motor vehicles, which has a brake pressure sensor or main brake cylinder, a pressurizing medium reservoir, an electrohydraulic pressure source, separation valves, which are inserted in the connection between the main brake cylinder and the wheel brakes, inlet valves, which are connected before the wheel brakes, and outlet valves which are connected after the wheel brakes, as well as a valve block, which receives the pump, the separation valves as well as the inlet valves and the outlet valves, where the pressure source, the wheel brakes as well as the brake pressure sensor can be connected with the pressurizing medium reservoir. To produce a compact electrohydraulic equipment assembly, the brake pressure sensor (2) is integrated in such a manner in the valve block (16) that all the hydraulic connections between the brake pressure sensor (2) and the separation valves (27-30) as well as the inlet valves (47-50) are formed by bores in the valve block (16).

Claims

1-22. -22. (canceled)

23. An electrohydraulic brake system for motor vehicles comprising:

a brake pressure sensor, which can be actuated by a brake pedal;

a pressurizing medium reservoir, having at least one electrohydraulic pressure source, by which pressure can be applied to wheel brakes of the motor vehicle, wherein the brakes can be connected via at least one hydraulic connection, which can be sealed off by a separation valve;

a device for identifying a deceleration instruction from a driver;

inlet valves which are connected before the wheel brakes and outlet valves which are connected after the wheel brakes;

an electronic control and regulation unit, which, as a function of signals which are generated by the device for the detection of deceleration instruction from a driver, actuates the pressure source, the separation valve, as well as the inlet valves and the outlet valves; and

a valve block, which receives the separation valve, as well as the inlet valves and the outlet valves, where the pressure source, the wheel brakes as well as the brake pressure sensor can be connected with the pressurizing medium reservoir, wherein the brake pressure sensor (2) is integrated in the valve block (16) in such a manner that all of the hydraulic connections between the brake pressure sensor (2) and the separation valve (27-30), of which there is at least one, as well as the inlet valves (47-50) are formed by bores in the valve block (16).

24. An electrohydraulic brake system according to claim 23, wherein the electrohydraulic pressure source consists of a pump (26) which is driven by an electromotor (21) and which is also integrated in the valve block (16) in such a manner that the connections between the pump (26) and the inlet valves (47-50) consist of bores in the valve block (16).

25. An electrohydraulic brake system according to claim 23, wherein the electrohydraulic pressure source consists of a high-pressure reservoir, which is loaded by means of a motor-pump aggregate.

26. An electrohydraulic brake system according to claim 23, wherein the pressurizing medium reservoir (6) is arranged on the valve block (16) and it is formed in its entirety or partially by the valve block (16), and in that the hydraulic connections between the pressure source (26) and the pressurizing medium reservoir (6), as well as between the hydraulic connections between the brake pressure sensor (2) and the pressurizing medium reservoir (6), consists of bores in the valve block (16).

27. An electrohydraulic brake system according to claim 23, wherein the electronic control and regulation unit (14) is attached directly to the valve block (16) in such a manner that electrical, magnetic and thermal signal and power transmissions occur without the use of lines.

28. An electrohydraulic brake system according to claim 27, wherein that the hydraulic connection (22) between the pressure source (26) and the pressurizing medium reservoir (6), and optionally parts of the pressure medium reservoir (6) can be heated.

29. An electrohydraulic brake system according to claim 23, wherein the valve block (16) and a piston rod (24), which is used to actuate the brake pressure sensor (2), are connected in a manner which allows elastic oscillations with the body or a dashboard (66) of the motor vehicle or to a pedal system.

30. An electrohydraulic brake system according to claim 23, wherein the pressurizing medium reservoir (6) presents a first chamber (61) as well as a second chamber (62), where the aspiration side of the pump (26) and, via the outlet valves (57-60), the wheel brakes (17-20) are connected to the first chamber (61), while the brake pressure sensor (2) is connected to the second chamber (62) via a first, current-free closed (CC) valve (5), which can be regulated by analog means.

32. An electrohydraulic brake system according to claim 23, wherein the brake pressure sensor (2) is connected to the input connection of the inlet valves (47-50) via a second, current-free closed (CC) valve (13), which can be regulated by analog means.

33. An electrohydraulic brake system according to claim 23, wherein the inlet valves and the outlet valves (47-50, 57-60) are designed as electromagnetically activated, current-free closed (CC) 2/2-way control valves.

34. An electrohydraulic brake system according to claim 23, wherein the separation valves (27, 28, 29, 30) is assigned to each wheel brake (17, 18, 19, 20), and in that the separation valves (27-30) are designed as electromagnetically activated, current-free open (CO) valves, which can be regulated by analog means.

35. An electrohydraulic brake system according to claim 34, wherein the brake pressure sensor (2) is designed as a two-circuit main brake cylinder, whose secondary pressure space (45) is connected via the first, current-free closed (CC) valve (5), which can be regulated by analog means, to the second chamber (62), while the primary pressure space (25) of said cylinder is connected via an electromagnetically actuated 2/2-way control valve (32) to the secondary pressure space (45).

36. An electrohydraulic brake system according to claim 23, wherein the brake pressure sensor (2) is designed as a single-circuit main brake cylinder.

37. An electrohydraulic brake system according to claim 23, wherein a hydraulic pressure space (33) is connected before the piston (42) of the main brake cylinder (2), where the pressure space receives pressure that is generated by the pump (26).

38. An electrohydraulic brake system according to claim 37, wherein the line (34) which connects the pressure side of the pump (26) to the pressure space (33), an electromagnetically activated, current-free (CO) 2/2-way or control valve (35) is inserted, which makes it possible to cut off the line (34).

39. An electrohydraulic brake system according to claim 37, wherein the hydraulic pressure space (33) is connected with the insertion of a check valve (41) to the pressuring medium reservoir (6).

40. An electrohydraulic brake system according to claim 37, wherein the piston (42) delimits a trailing space (44), which is connected to the pressurizing medium reservoir (6), which in turn is connected via the check valve (41) to the pressure space (33).

41. An electrohydraulic brake system according to claim 37, wherein an air regulator (53) is provided between the check valve (41) and the pressurizing medium reservoir (6), and a parallel connection is provided between the hydraulic series connection, which consists of the check valve (41) and the air regulator (53), and an electromagnetically activated, current-free open (CO) control valve (52).

42. An electrohydraulic brake system according to claim 23, wherein the pressure sensor (2) is connected to the aspiration side of the pump (26) and, between the connection of the pressure sensor (2) and the pressurizing medium reservoir (6), a check valve (56) is arranged, which opens towards the pump (56).

31. An electrohydraulic brake system according to claim 31, wherein one or more devices (11, 12) are provided for detecting the pressurizing medium level in the first and the second chamber (61-62).

43. A method for operating an electrohydraulic brake system for motor vehicles, with a brake pressure sensor, which can be actuated with a brake pedal, with a pressurizing medium reservoir, with at least one electrohydraulic pressure source, by means of which pressure can be applied to the wheel brakes of the motor vehicle, which brakes can be connected via at least one hydraulic connection, which can be sealed off by means of a separation valve, with a device for the identification of the driver'"'"'s deceleration instruction, with inlet valves which are connected before the wheel brakes and outlet valves which are connected after the wheel brakes, with an electronic control and regulation unit, which, as a function of signals which are generated by the device for the detection of the driver'"'"'s deceleration instruction, actuates the pressure source, the separation valve, of which there is at least one, as well as the inlet valves and the outlet valves, as well as with a valve block, which receives the separation valve, of which there is at least one, as well as the inlet valves and the outlet valves, where the pressure source, the wheel brakes as well as the brake pressure sensor can be connected with the pressurizing medium reservoir, the method comprising:

in a normal braking operation, producing a continuous buildup of hydraulic pressure in wheel brakes (17-20) by electrohydraulic pressure source (26); and

producing a continuous decrease of the hydraulic pressure in the wheel brakes (17- 20) by at least one separation valve (27-30).

44. A method according to claim 43, wherein during the actuation of the brake pressure sensor (2), the displaced pressurizing medium volume is led, in a first phase, via the separation valves (27-30), to the wheel brakes (17-20) and, in a second phase, via at least one electrically actuated valve (5), which can be controlled by analog means, to the pressurizing medium reservoir (6).