DE102007037447A1 - Pressure regulator for slip-controlled hydraulic brake system in motor vehicle, has wireless transducer operated between measuring point and rotary sensor, and producing wireless information transmission between point and sensor - Google Patents

Abstract

The regulator (1) has a housing (3) for accommodating electrically operable pressure-regulation valves, and another housing (8) for accommodating a carrier (20). A rotary component i.e. rotor of an electric motor (6), is arranged on a flange surface (4) provided at the former housing and lying opposite to the latter housing so as to drive a hydraulic displacement pump. A rotary sensor (22) is directly arranged on the carrier. A wireless transducer (23) is operated between a measuring point (21) and the sensor and produces wireless information transmission between the point and the sensor.

Description

The The invention relates to a pressure regulator for a Slip-controlled hydraulic brake system in a motor vehicle, with a first housing for receiving preferably a plurality of electrically operated pressure control valves, and with a on one side attached second housing, the a support for electrical and / or electronic components receiving, being in the range of one to be sensed, rotating Component - in particular a rotor of an electric drive - a Measuring point is provided for a rotary sensor, and the rotating Component preferably on a, the second housing opposite lying, side is arranged on the first housing, to drive a hydraulic positive displacement pump.

A generic pressure regulator goes out of the EP 1 360 098 B1 out. To detect the speed of the electric drive, the pressure regulator has an optical sensor placed directly at the measuring point in the area of the rotor and connected to a board of an electronic controller with a plurality of electrical cables or wires. Furthermore, a shaft has a rotationally fixed thereto attached coding with optical contrast. The obtained rotation information is intended to serve for engine speed control or engine speed control.

Especially the arrangement of the rotation sensor, but also its connection in the direction Board is in need of improvement. It is therefore an object of present invention, an improved pressure control device to provide that a simple education allows for the speed detection of a rotating component.

to Solution to the problem is proposed that the rotation sensor directly directly on the support for the electrical and / or electronic components is arranged, and that between the measuring point and the rotation sensor a wireless converter effective is that a wireless information transfer between Measuring point and rotation sensor causes. Dissolves according to the invention the invention of the known procedure, the rotation sensor immediately to place directly at the measuring point, as well as from the previous approach, for the connection between Measuring point and board provide electrical contact. Rather, a wireless connection is proposed. According to the invention reduced installation costs.

Under the requirement that a mechanical over carbon brushes Commutated electric drive is used is in development the invention provided that the measuring point at a distance, in particular shielded from a carbon brush commutation device, placed in a motor housing. This is sure provided that information gathering and information transmission are not affected by disturbances of any kind.

In Another advantageous embodiment of the invention is the converter between measuring point and rotation sensor without contact with at least arranged an air gap, which has the advantage that mechanical Losses and wear are largely avoided. there is preferably provided that the converter has a through hole penetrates in the first housing.

at a particularly favorable embodiment of the invention the converter attached to the second housing such that In a way, by the way - by assembling the two housings together - just into the through hole can be plugged in, so that also a easy to assemble design is present.

in the Connection with a particularly lossless embodiment of the Invention, the converter comprises at least one optical waveguide, and that the rotation sensor comprises at least a photodiode and a photodetector having. Consequently, a light information is transmitted by the rotation sensor, which modulates in a special way by the rotation of the rotor becomes. The rotation sensor is in turn capable of such modulated Light signal a specific rotor rotational behavior (direction of rotation, speed, Spin). Accordingly, the optical waveguide Flooded bidirectionally. Consequently, the converter has on a rotating component in the area of the measuring point a transmitter, in particular an optical reflector, with integrated Modulator, wherein the modulator is designed such that a Direction of rotation detection is enabled by the electric drive.

From Of particular importance in this context is that the optical waveguide is provided with end portions, and that the end portions at least a light entry surface and / or a light exit surface exhibit. This results in a defined and loss-free light entry and light emission allows reflection losses to be minimized, by defining the end sections respectively at right angles to one Axis through the optical fiber ends. In conjunction with the preferred Embodiment, it is particularly advantageous if the end portion with the light entry surface and / or with the light exit surface is aligned plane-parallel to the rotor-side measuring point.

With regard to potential contamination in the area of carbon brushes in the form of Ab Riebpartikeln is conceivable, it is advantageous if means are provided which allow automatic cleaning of the light entry surfaces and / or the light exit surfaces. According to a particularly favorable design, these means are driven by the rotating component. This may be, for example, a fan which acts on the end sections in such a manner with an air flow or air suction that particles and dusts are removed from one or more end sections. The blower may, for example, have an impeller for this purpose.

advantageously, is the end section with the sensor-side light entry surface and / or light exit surface plane-parallel to a light-active portion formed of the rotary sensor.

All In principle, it is not only possible optical, in particular Infrared-based wireless data transmission techniques but other wireless transmission techniques, such as in particular radio links between a transmitter and a receiver be provided without departing from the invention.

The Invention will be described below with reference to several embodiments describe, which are shown in the drawing. In the drawing shows:

1 a pressure regulator comprising a first housing, a second housing and an electric drive in each case in section, in a slightly enlarged scale,

2 Details in the range of a sensor-side end portion of 1 on average and on a larger scale,

3 a modified rotor-side end section in section and on a larger scale,

4 a basic variant for an optical encoder,

5 a further, fundamental variant of an optical encoder with additional commutation information for an electronically commutated drive, and

6 an encoder with sections for additional commutation information and sections for additional direction of rotation detection for an electronically commutated drive.

A slightly enlarged illustrated pressure regulator 1 according to 1 is used for slip control within a hydraulic brake system in a motor vehicle.

The pressure regulator 1 includes a valve or pump block 2 in the sense of a hydraulic control unit (HCU), which serves to accommodate in addition to a pump not shown in detail also hydraulic, electromagnetically controllable hydraulic pressure control valves. For flanging neighboring components on the first housing 3 serve two opposing flange surfaces 4 . 5 , On one, in the figure above, flange 4 there is an electric drive 6 (Electric motor), most of a non-drawn electrical connector, the first housing 3 engages, is connected to an electronic control device, which is in a second housing 8th located on the opposite, lower flange surface 5 is flanged.

The electric drive 6 comprises a stator comprising a cup-shaped, unilaterally open motor housing 9 which has a pot bottom 10 with a cup-shaped receptacle 11 for a first camp 12 having. Another component of the stator is a bearing plate 13 provided, which the open end of the motor housing 9 closes. The bearing plate 13 take a second camp 14 on. Camps 12 . 14 are for rotatably receiving a motor shaft 15 provided, which is part of a rotor, which depending on the embodiment as further components either windings 16 or magnets 17 includes.

At the camp sign 13 is also a passage 18 for the motor shaft 15 provided that allows the motor shaft 15 with a drive element in a recess 19 from the pump block 2 engages to drive pump piston directly or indirectly. Although in the figure a brushless electric drive is shown in principle, the end shield 13 be designed in a further embodiment of the invention at the same time as a brush holder plate, so that in the result a commutator motor with carbon brushes is obtained.

In the following, essentially the second housing 8th the electronic control device (ECU) described. The hardware of the electronic control device, comprising at least one microprocessor and power electronic components such as in particular so-called driver stages for connected valve coils, are essentially applied to a carrier, such as an electronic board, and serve to execute software-based control method, in which - in addition to a scheme the electro-hydraulic valves - also the power supply and the control or regulation of the electric drive 6 , and consequently, control of the characteristics of the hydraulic pump may be involved.

For the purpose of obtaining rotational information (rotational speed, rotational acceleration, direction of rotation) is in the range of the rotating component to be sensed - in particular the rotor of the electric drive 6 , So preferably the motor shaft 15 - a measuring point 21 with the involvement of a rotary sensor 22 intended.

Here is the rotation sensor 22 directly on the carrier 20 arranged for the electrical and / or electronic components, wherein between the measuring point 21 and the rotation sensor 22 to bridge the spatial distance a wireless converter 23 is effective, the wireless information transmission between the measuring point 21 and rotation sensor 22 allows.

As a rotation sensor 22 Advantageously, an optical sensor or a magneto-sensitive sensor with an optical or magneto-sensitive sensor element is provided. Possible applications use laser light and a photosensitive receiving cell. For this reason is in 1 a light-emitting diode and a photocell symbolizes. Other principles are based on infrared technology.

The converter 23 allows wireless transmission of information between the measuring point 21 and rotation sensor 22 , It is advantageous if the measuring point 21 at least at a distance, that is offset, preferably arranged to a greater extent by housing walls mechanically, optically, magnetically and / or electrically shielded by a carbon brush commutation device, as far as such is used. This measure serves to avoid interference or interference signals.

By the converter 23 a through hole 24 in the first case 3 penetrates, an externally-exposed arrangement can be avoided. In other words, the converter 23 not accessible from the outside, and therefore protected from external damage. The converter 23 is between each measuring point 21 and rotation sensor 22 inserted without contact with an air gap. This eliminates the need for extensive work to produce a contacting electrical contact (soldering, welding, riveting or the like). By the converter 23 an optical fiber 25 , it is possible to choose a simple single-core training, which is nevertheless bidirectionally usable for signal transmission. In other words, it will allow the rotation sensor 22 a photoactive emitter such as in particular a photodiode and a photoactive recipient such as in particular a photodetector. The operation is as follows:
Starting from the issuer in the rotation sensor 22 the generated light is unmodulated in a sensor-side end portion 26 from the optical fiber 25 coupled, which the beam largely lossless up to a measuring point end section 27 forwards. There, the light beam is largely free from scattering, that is ideally coupled out in an extensively bundled manner in an extended converter, to an optical encoder 28 to meet, which is fixed on the rotor side. The optical encoder 28 is used to generate an optical, modulated signal, which is exploited for the determination of rotor blade information. For this purpose, the encoder has 28 to 4 via - according to a predetermined pattern provided - reflective and non-reflective sections. Upon impact of the unpulsed light beam on the sections 29 . 30 from the encoder 28 is a - depending on the rotational behavior - modulated (pulsed) signal generated, which again in the optical waveguide 25 coupled and back to the rotation sensor 22 is directed. The modulation frequency of the transmitted signal allows a conclusion about the current rotor speed.

With regard to the end sections 26 . 27 It should be added that these are arranged according to the optical laws as smooth as possible - with the lowest possible roughness - and at right angles to the desired beam direction in order to minimize scattering and reflection losses at interfaces. However, if it is essential in the light of the situation, it is possible to partially distance this principle, for example by the rotor-side end section 27 according to 3 is formed bevelled. Taking advantage of the principle that a light beam is refracted away from the solder during the transition from the optically dense medium into the optically less dense medium, and vice versa, this makes it possible to use the encoder 28 placed offset on the rotor, and not in directly projected extension of the end portion 27 the converter 23 ,

The optical encoder 28 is preferably disc-shaped, and can be modified in many ways to be available for other or additional tasks. The modification is preferably carried out by superimposing and transmitting an additional modulated optical signal in addition to a modulated optical signal, which is used to determine the rotor speed, which serves to complete the additional tasks. For example, it is conceivable to use a brushless electric drive 6 with two pairs of poles, which has electronic commutation and the possibility of obtaining rotor ore information. Depending on the number of pole pairs of the electric drive 6 For example, is it possible to use the encoder 28 according to 5 provided with two additional information K on the Kommutierungszeitpunkte, so that after a Kommutierungsinformation K the desired reversal of the electrical supply pre is taken.

Furthermore, according to 5 and 6 with a corresponding encoder 28 possible to aufzumodulieren the rotor rotation information signal an additional, usually equipped with a lower frequency signal, which serves to obtain a separate information on the specific direction of rotor rotation. Namely, at least once per revolution, for example, two different, especially in relation to the rotation angle, differently shaped, reflective (or non-reflective) special sections 31 . 32 are provided, information about the current direction of rotor rotation can be obtained. By this measure, the startup behavior of an electronically commutated drive 6 be monitored and improved in the event that the DC motor for some reason, or not in the correct direction starts. From the number of commutation information in 6 Incidentally, it can be concluded that the explanation in principle on the example of an electric drive 6 takes place with four magnetic pole pairs.

Even though The invention above almost exclusively by way of example described by an optical converter, it is conceivable the optical device by other means, such as by infrared or radio technical means to replace, without the To leave invention.

1

Pressure Regulator

2

pump block

3

casing

4

flange

5

flange

6

electrical drive

7

control device

8th

second casing

9

motor housing

10

pot base

11

admission

12

camp

13

end shield

14

camp

15

motor shaft

16

winding

17

magnet

18

passage

19

recess

20

carrier

21

measuring point

22

rotation sensor

23

converter

24

Through Hole

25

optical fiber

26

end

27

end

28a, b, c

encoder

29a, b, c

section

30a, b, c

section

31b, c

special section

32b, c

special section

ECU

Electronic Control Unit (electronic control unit)

HCU

Hydraulic Control Unit (hydraulic control unit)

K

commutation

S

transmitter

e

receiver

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1360098 B1 [0002]

Claims (16)

Pressure regulator ( 1 ) for a slip-controlled hydraulic brake system in a motor vehicle, with a first housing ( 3 , HCU) for receiving preferably a plurality of electrically actuated pressure control valves, and with a second housing ( 8th , ECU) containing a support ( 20 ) for electrical and / or electronic components, wherein in the region of a to be sensed, rotating component - in particular rotor of an electric drive ( 6 ) - a measuring point ( 21 ) for a rotary sensor ( 22 ) is provided, and the rotating component preferably on one, the second housing ( 8th ) opposite, flange surface ( 4 ) on the first housing ( 3 ) is arranged to drive, for example, a hydraulic positive displacement pump, characterized in that the rotary sensor ( 22 ) directly directly on the support ( 20 ) is arranged for the electrical and / or electronic components, and that between the measuring point ( 21 ) and the rotation sensor ( 22 ) a wireless converter ( 23 ), which provides wireless information transmission between the measuring point ( 21 ) and rotation sensor ( 22 ) causes. Pressure regulator according to claim 1, characterized in that the measuring point ( 21 ) at a distance, in particular shielded, from a carbon brush commutation device, in a motor housing ( 9 ) is placed. Pressure regulator according to claim 1 or 2, characterized in that the converter ( 23 ) between measuring point ( 21 ) and rotation sensor ( 22 ) is arranged without contact with at least one air gap. Pressure regulator according to one of claims 1 to 3, characterized in that the converter ( 23 ) a through hole ( 24 ) in the first housing ( 3 ) penetrates. Pressure regulator according to claim 4, characterized in that the converter ( 23 ) on the second housing ( 8th ), and by mounting the two housings ( 3 . 8th ) to each other in the through hole ( 24 ) is inserted. Pressure regulator according to one of claims 1-5, characterized in that the converter ( 23 ) as an optical waveguide ( 25 ) is formed, and that the rotation sensor ( 22 ) has at least one photodiode and a photodetector. Pressure regulator according to one of claims 1-6, characterized in that the optical waveguide ( 25 ) is bidirectionally flooded. Pressure regulator according to claim 7, characterized in that the optical waveguide ( 25 ) with end sections ( 26 . 27 ), and that the end sections ( 26 . 27 ) have at least one light entry surface and / or one light exit surface. Pressure regulator according to claim 8, characterized in that the end sections ( 26 . 27 ) defined at right angles to an axis through the optical waveguide ( 25 ) end up. Pressure control device according to claim 8, characterized in that the end section ( 27 ) with the light entry surface and / or with the light exit surface plane-parallel to the rotor-side measuring point ( 21 ) is aligned. Pressure control device according to one of claims 8 to 10, characterized in that means are provided which allow automatic cleaning of the light entry surfaces and / or the light exit surfaces of the converter ( 23 ) enable. Pressure regulator according to one of the claims 11, characterized in that the means of the rotating Component are driven, and preferably as a fan are formed. Pressure control device according to claim 8, characterized in that the end section ( 26 ) with the sensor-side light entry surface and / or light exit surface plane-parallel to a light-active portion of the rotation sensor ( 22 ) is trained. Pressure regulator according to one of the preceding claims 1 to 5, characterized in that the converter ( 23 ) is designed as a wireless infrared connection or as a radio link between a transmitter and a receiver. Pressure control device according to claim 1, characterized in that the rotating component in the region of the measuring point ( 21 ) an encoder ( 28 ) and that the encoder ( 28 ) is designed such that an electronic commutation and / or direction of rotation detection of the electric drive ( 6 ) is possible. Pressure regulator according to claim 1, characterized that one signal for speed detection one or more additional signals for additional tasks are modulated.