DE102009022572A1 - System for testing compressed air unit of vehicle, has sensor and module that are attached at element of braking system, where sensor and module are provided for duct and breather - Google Patents

Abstract

The system has a sensor and a module that are attached at an element of a braking system. The system is arranged and integrated such that the measured signal of the sensor and control signal are transmitted at an electronic evaluated and control unit (1) with the module. The sensor and the module are provided for a duct and a breather. The sensor, module and the electronic evaluated and control unit are connected at an independent bus system, particularly a Controller area networkbus system (17). An independent claim is included for a method for testing the compressed air unit of vehicle with a system.

Description

The The invention relates to a system and method for verification of compressed air systems, in particular pneumatic brake systems of Vehicles, especially in occasion-related or periodic reviews, such as B. General inspection of commercial vehicles, as prescribed in the FRG, can be used. It can also be used for diagnostic purposes in workshops be used. This can be a check on Road vehicles alone and also their trailers respectively.

to Conducting tests or for diagnostic purposes are on vehicles by the manufacturer standardized test connections Installed. These test connections are measuring points in the compressed air system of a vehicle. The position of such test connections or Measuring points are not standardized or otherwise specified and varied from vehicle manufacturer, vehicle type, configuration of the respective Brake or compressed air system and a possibly expressed customer request.

Usually carried out on vehicles the review of each acting on wheels set braking force by a Pressure measurement of the brake pressure corresponding to the vehicle with calibrated, analogue manometers on existing test connections or measuring points of vehicles.

to Brake force determination at the wheels of to be tested Vehicles are stationary test benches in use.

The Results of reviews should be in the form of punctual read pressure values to corresponding respectively set Braking force the technically perfect condition and compliance confirm regulations if you are within a given Tolerance range have been determined.

The determined during conventional checks Measurement data is mostly entered manually in logs, which are required for documentation purposes. With the hitherto used technical Certain parameters can not or only in limited Scope are recorded and taken into account. As the reading and merging the determined measured values, such as braking force values and associated pressures are visually and manually there is a high potential for error. A subjective influence, such as B. the respective experience of the test personnel can not be avoided.

It is therefore an object of the invention in the review of compressed air systems further characteristics of the compressed air system and improved documentability to achieve a more objective assessment.

According to the invention This object is achieved by a system having the features of claim 1 has dissolved. In the review can with a method according to the claims 13 or 14 are worked.

At the The system according to the invention can be an electronic Evaluation and control unit, such as a PC, in conjunction with sensors and modules attached to elements of a compressed air system be attached or arranged or integrated into this can be used. This can be measured signals be transmitted from sensors and modules to the electronic evaluation and control unit. Optionally, however, control signals can also be transmitted for example, a program sequence during the review to be able to comply. For example, this can be done Valves of the compressed air or brake system are opened or closed. The sensors and modules can be used for the and vent the compressed air system to act appropriately.

Advantageous may be a native bus system, in particular a CAN bus system sensors, modules and electronic evaluation and control unit can be connected. This can be done using a data transmission line, the has a sufficiently large length and at the Connections for sensors, modules and electronic Evaluation and control unit are available. The bus system can be used as separate element that can be used with the electronic evaluation and control unit may be connected or integrated therein.

modules and sensors can also be combined or be used integrated.

at The invention may include pressure sensors, controlled vent modules and controlled ventilation modules used and for the review will be used.

Especially It is advantageous to use a brake pedal travel sensor whose the respectively covered brake pedal travel representative measuring signals can be recorded and alone or in addition to time-resolved recorded measurement signals are evaluated. A brake pedal travel sensor may be attached to a brake pedal of a vehicle attached or arranged there or connected.

It can also be a connection to an electrical onboard voltage source available be.

The individual sensors, modules and the electronic system Evaluation and control unit can also be designed that a wireless signal transmission is possible. For this purpose, the individual components with an electric energy storage be provided. The wireless signal transmission can with be achieved per se known means.

Cheap is it also a connection possibility (interface) for Brake force value signals of a stationary brake testing system provide with these also the measuring signals in the review can be included. This can also the braking deceleration determined with the brake test system transmitted to the electronic evaluation and control unit become.

sensors and / or modules should be at predetermined intervals at the Brake system can be arranged or attached, which in particular applies to compressed air lines. The distance to each other should not be larger than 2000 mm.

sensors and / or modules can be connected to compressed air lines of the respective Be connected vehicle. The connection is to pneumatic connections, such as test connections or filling connections possible. But you can also use a pressure regulator, a protective valve, a compressed air tank, a coupling head, Check valve, check valve, a parking brake valve, a trailer control valve, a spring-loaded cylinder, a brake valve, a brake cylinder, Relay valve, pressure relief valve, load / idle valve, to secondary compressed air consumers, on the automatic load-dependent brake force distribution (ALB) and / or a trailer brake valve be present.

As already mentioned, can be a time-resolved capture and evaluation of detected measurement signals during the check be performed. In this case, then measuring signals the sensors or modules used at the same time and also their time-varying course taken into account become.

With The invention is a high measured value resolution at about 20 ms possible. The data can be with high security captured in a timely manner and in logged form after their evaluation electronically provided, stored and logged become.

It is possible to make an adaptation to new technical systems and elements for brake systems or testing technology. It is an evaluation according to ISO 7638 (Brake pressure, error, status) possible.

The Testing can be done automatically so that the subjective influence is avoidable. It's a high one Given flexibility, so that also different types of vehicles can be considered.

following the invention is explained in more detail by way of example become.

there demonstrate:

1 in schematic form possibilities for examples of a system according to the invention on a utility vehicle for semitrailers;

2 a block diagram of an example of a system according to the invention with wired signal transmission and

3 a block diagram of an example of an inventive system with wireless signal transmission.

A mobile PC forms an electronic evaluation and control unit 1 and can be connected via a connection to a central data transmission line 3 , here referred to as measuring cable, to be connected to test terminals of the CAN bus. Modules and sensors are connected to the data transmission line.

It is also a brake pedal travel sensor 2 available and connected.

A connection of the data transmission line 3 , Sensors and / or modules can also be connected to an interface of the CAN bus system 17 be realized of the vehicle to be checked.

With the representation of 1 should be clarified that even a wireless signal transmission can be used.

To the data transmission line 3 are the brake pedal travel sensor 2 , the interface of the CAN bus system 17 , Pressure sensors 14 , the sensors of the ventilation modules 4 and the filling module 5 connected. The connection between brake pedal travel sensor 2 , Interface to the CAN bus system 17 and the data transmission line 3 is with module connecting cables 18 realized.

For the power supply is a connection to the electrical onboard voltage source 16 available.

In the 1 to 3 are the same technical elements, each with the same reference numerals Mistake.

So will from the into the 2 and 3 shown block diagrams clearly that the measurement and control signals from or to the electronic evaluation and control unit 1 he follows. In 2 is shown as this with the help of a data transmission line 3 can be done. At the in 3 As shown, a wireless measurement and control signal transmission has been selected. The individual sensors are, as well as the electronic evaluation and control unit 1 equipped with suitable transmitters and receivers.

Measurement signals are with one in two ventilation modules 4 integrated pressure sensor, which are intended for the two compressed air circuits detected. Another sensor is in a filling module 5 present over which the two compressed air tanks 6 and 7 can be filled.

Other pressure sensors 8th and 9 are available for checking the brake pressure on the front and rear axles of a vehicle. When checking the brake pressure for the rear axle, the function of an automated load-force-dependent brake force distribution can also be used 10 to be checked with.

With the brake pedal travel sensor 2 can be the one when pressing the brake pedal 11 returned brake pedal path corresponding measurement signal to the electronic evaluation and control unit 1 be transferred and used in the evaluation and logging.

The with a stationary brake tester 12 recorded measurement signals can also be sent to the electronic evaluation and control unit 1 be transmitted.

A stationary compressed air supply 13 , which is already installed, for example, in a motor vehicle workshop, can also be used to supply the vehicle brake system with compressed air and the compressed air reservoir 6 and 7 with compressed air during the inspection.

1

electronic Evaluation and control unit

2

Brake pedal travel sensor

3

Data transmission line

4

venting module

5

filling module

6

Air receiver

7

Air receiver

8th

pressure sensor

9

pressure sensor

10

automatic load-force-dependent brake force distribution

11

brake pedal

12

Bremsprüfanlage

13

Air Supply

14

pressure sensors

16

electrical Board voltage source

17

interface to the CAN bus system

18

Module connector cable

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 non-patent literature

• - ISO 7638 [0021]

Claims (17)

System for checking compressed-air systems of vehicles, in which sensors and modules are mounted, arranged and / or integrated in at least elements of a brake system, measuring signals of the sensors and additionally control signals at the modules to an electronic evaluation and control unit ( 1 ) are transferable. System according to claim 1, characterized in that sensors and modules for ventilation ( 4 . 5 ) available. System according to claim 1 or 2, characterized in that sensors, modules and electronic evaluation and control unit ( 1 ) are connected to a native bus system, in particular a CAN bus system. System according to one of the preceding claims, characterized in that pressure sensors ( 8th . 9 . 14 ), controlled deaeration modules ( 4 ) and / or controlled aeration modules ( 5 ) and to the electronic evaluation and control unit ( 1 ) and the compressed air system can be connected. System according to one of the preceding claims, characterized in that a brake pedal travel sensor ( 2 ) or to a brake pedal ( 11 ) adjoining or attachable thereto. System according to one of the preceding claims, characterized in that a connection to an electrical on-board voltage source ( 16 ) is available. System according to one of the preceding claims, characterized in that for the transmission of measurement and / or control signals a central data transmission line ( 3 ) is available. System according to one of the preceding claims, characterized in that measurement signals wirelessly transferable are. System according to one of the preceding claims, characterized in that measurement signals for brake force values and / or braking deceleration of a brake test system ( 12 ) are transferable. System according to one of the preceding claims, characterized in that sensors and / or modules in predetermined Distances arranged or attached to the brake system are. System according to claim 10, characterized that the distance from sensors and / or modules in each case not larger than 2000 mm. System according to one of the preceding claims, characterized in that sensors and / or modules to pneumatic Connections, test connections, coupling heads, Filling connections connected or connectable are. Procedure for checking Pneumatic systems of vehicles with a system according to one of previous claims, wherein the measurement signals from sensors and / or modules time-resolved recorded and evaluated become. Method for checking compressed air systems of vehicles with a system according to one of Claims 1 to 12, in which measuring signals from sensors and / or modules are dependent on a brake pedal travel sensor ( 2 ) detected measuring signals are detected and evaluated. Method according to claim 13 or 14, characterized that measurement signals from sensors and / or modules time resolved and detected depending on the particular brake pedal travel and evaluated. Method according to one of claims 13 to 15, characterized in that a signal transmission with a bus system is performed. Method according to one of claims 13 to 16, characterized in that a signal transmission wirelessly is carried out.