JP2000085569A - Diagnosing method and device for electrical brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the diagnosis and/or the service work in an electrical control type brake device. SOLUTION: A service and diagnosis device 102 can be connected to the control unit 19 of a brake device 100 through an interface 15. The control unit memorizes a service information and/or the error information in memory devices 29 and 30, and those informations are read by the service and diagnosis device through the interface. The control unit receives an examination program 13 through the interface. Furthermore, the service and diagnosis device reads the memorized informations from the control unit, it selects the examination program as the function of the read error code, and transmits it to the control unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for diagnosing an electric brake device.

[0002]

2. Description of the Related Art An electric brake system is known from DE 196 34 567 A1. There is described a control arrangement for an electromechanical brake device, in which the individual wheel brakes are controlled by an electromechanical setting element as a function of a brake request derived from a brake pedal actuation signal. In this connection,
Error conditions within the control device are determined and indicated to the driver or stored in an error memory. Emergency braking is activated as a function of the respective error condition. No means is described for assisting diagnostic and service work on such electric brake systems.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide measures and a method for improving diagnostic and / or service work in an electrically controlled braking device.

[0004]

The above object is achieved by a control unit operating an actuator as a function of a driver's braking desire, the control unit storing error information and / or service information in at least one storage device. A method for diagnosing an electric brake device to which a service diagnostic device is connectable via an interface, wherein the control unit outputs stored information to the service diagnostic device via the interface, and the control unit outputs the service diagnostic device. Modified to receive and / or write inspection programs and / or service programs as a function of the stored information from the device to perform inspection steps through the interface. Information or Is solved by the diagnostic method of the electric brake apparatus of the present invention, wherein the receiving the information or both of these provisions.

[0005] The above object is also provided in that the service diagnostic device can be connected via an interface to a control unit of the electric brake device, via which the service diagnostic device is stored with respect to error conditions and / or service information. In the method for diagnosing an electric brake device provided with the service diagnostic device for reading the read information, the service diagnostic device selects an inspection program or a service program based on the read error code or service code or both, and The diagnosis method for an electric brake device according to the present invention is characterized in that the selected inspection program or service program is transmitted to the control unit of the electric brake device via the interface.

The above object is further achieved by a control unit for controlling the electric brake device, which operates the actuators of the wheel brakes as a function of the driver's braking desire, and the control unit stores error information and / or service information. Diagnostic device for an electric brake device, comprising a storage device to be connected and a service diagnostic device capable of being connected to the control unit via an interface, wherein the control unit stores the stored information via the interface. Output to a service diagnostic device, wherein the control unit receives a test program and / or a service program from the service diagnostic device via the interface as a function of the stored information to perform a test step, or Receive information or both these modified information or new to write to the storage device, or is solved by the diagnostic device of the electric brake apparatus of the present invention which is characterized in that both the receipt.

The above object is further attained by the fact that the service diagnosis device can be connected to the control unit of the electric brake device via an interface, and the service diagnosis device can be configured to write the error code or the service code written in the control unit, or the like. A diagnostic device for an electric brake device provided with the service diagnostic device, including means for reading both via the interface, wherein the service diagnostic device has a storage device, and the inspection program or the service program has a read code. Wherein the test program or the service program is transmitted to the control unit of the electric brake device through the interface as a function of the diagnosis of the electric brake device according to the present invention. Solved by device It is.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an electromechanical brake device 100 and a diagnostic or service device 102 according to the invention. The essential components of the electromechanical brake device 100 are a brake control unit 19, a calculation unit 20 for determining a driver's braking desire, actuators 21 to 24 which are electromechanical brake setting devices, and wheel brakes 25 to 28. , Service memory 29, error memory 30, driver information display 31, and real-time clock 16. As is known from the state of the art described at the outset, the control unit 19 includes, in addition to the brake control, the known functions of anti-lock control, drive slip control and / or driving stability control for controlling the braking system. Calculation unit 2
At 0, the driver's braking request is formed as a function of at least one actuating variable of the brake pedal, and this driver's braking request is transmitted to the control unit 19 via the illustrated interface (ie, line). The control unit 19 forms the individual wheel setpoints and / or the individual axle setpoint values for the braking torque to be generated or the braking force to be generated as a function of the braking request. These setpoints are transmitted to the electromechanical setting devices 21 to 24 for the braking devices 25 to 28 via the interface. From the setting devices 21 to 24, the control unit 19 is supplied with the applied braking torque or the applied braking force and, if necessary, the actual values of the current flowing through the motor, which actual values provide the braking force or the braking torque. Evaluated to control to a predetermined target value.

[0009] The control unit 19 further includes error detection means, which detects an error condition with respect to the control of the brake device. An error memory 30 is provided to store the error information. A time signal emanating from the real-time clock 16 is stored together with the error information, whereby the stored information is uniquely determined with respect to time. For example, the error between the current and the braking torque or the braking force is deduced from the setting device and / or the error in the braking torque or the braking force measurement is determined by examining the sensor signals. The error code, symbolized by block 18 in FIG. 1, is stored in the memory component 30 when an error condition is detected in the area of the wheel brake or when there are restrictions around the function of the braking device. You. Further, in the case of an error that restricts the brake operation, information is given to the driver via the driver information display 31. In one embodiment, errors that do not lead to a limit are written into service memory 29,
This error is taken into account in determining the service interval.

Further, the control unit 19 determines the wear information, and the control unit 19 stores the wear information in the service memory 29. The driver information display 31 is optically and / or acoustically provided to the driver via the interface regarding the need for service. In a preferred embodiment, the control unit 19
Writes the corresponding information in the memory component 29 at every fixed time interval or with each wear of the wheel brakes, this information being indicated symbolically by the reference numeral 17 in FIG. 1 (service code 17). At the same time, the control unit 19
Informs the driver about the need for service on the wheel brakes when the wheel brakes have become significantly worn and / or after a certain operating time has elapsed. In a preferred embodiment, the wear or wear of the wheel brakes is determined via the motor current or the motor voltage and, in the case of step motors or electric commutation motors, via the number of elapsed steps. In this case, the greater the motor current, the motor voltage or the step required to generate a given braking torque or a given braking force, the greater the wear or wear of the respective wheel brake. In another embodiment, a stroke sensor is provided in the wheel brake, which measures a measure of the travel stroke of the brake lining, and which determines the contact of the brake lining with the disc or drum. You. From this signal, it is possible to derive a measure for the wear or wear of the respective wheel brake, for example, when this contact shifts to a very large value. When the amount of wear or wear reaches the corresponding amount, the corresponding information in the service memory 29 for the corresponding wheel brake is optionally stored together with the time at that time.

In addition, information relating to the type and equipment of the braking device, in particular to the type of actuator used and / or to the software level used, is also stored in the service memory 29. When exchanging components, such information can be stored in the service memory 29 by an attending technician via the interface described below.

For communication with the diagnostic device and the service device 102, an interface 15, in particular a serial interface, is provided, but in other embodiments, a parallel interface is also provided, through which a technician in charge is provided. Can read, change and / or erase information from, or write information to, storage devices 29 and 30, and test and service programs are transmitted via these interfaces.

The diagnostic device and service device 102 includes a service diagnostic unit 1, an energy source 7, a service program memory 8, an error program memory 14, and a display 4 which consist essentially of the following components: a computational component.

In response to the inquiry symbol 11, in the connected service device or diagnostic device 102, a technician in charge can enter the service memory 29 and the error memory in response to a corresponding command input by, for example, a keyboard (not shown). Reading information stored in 30 and writing information in service memory 29 or changing the written information is shown.

The service diagnosis unit 1 operates the corresponding service program 9 based on the information content read from the service memory 29, and the service program 9 is read from the memory 8 and supplied to the control unit 19 via an interface. In this case, such a service program is engaged as a function of the information read from the service memory 29 in the brake control, for example, in the function test of the brake system, in which the correct function and the correct function in the wheel brakes are determined. The increase in braking force is checked. After the service check has been completed without error, the service diagnostic unit 1 stores the corresponding code indicated by the reference numeral 12 in FIG.
Is stored within. This information represents the successful execution of a functional test of the brake system as a basis for a future service test. If, for example, the service information is not present when the electronic control unit is replaced, a standard program is read from the memory 8 and transmitted to the brake device.

If a fault occurs in the operation of the brake device, the control unit 19 of the brake device generates a corresponding error code stored in an error memory 30. If the detected fault does not adversely affect the braking function, no information is provided to the driver. The information 18 stored at this time is read by the service inspection correspondence inspection program 9 within the range of the service inspection, and is instructed on the display 4 to the engineer in charge via the interface 2. If the obstacle adversely affects the braking function of the vehicle, information is provided to the driver via the driver information 31. At the same time, the error code 18 is stored in the error memory 30. This error code is read by the service diagnostic unit 1, and the service diagnostic unit 1 assigns a corresponding inspection program 13 to each error code. Next, the inspection program 13
5 to the control of the brake. The brake control then performs a corresponding test step, which identifies the detected error condition and possibly eliminates it.

When the service diagnostics unit 1 reads the information, an error message is formed in step 2 as a function of the code read and indicated to the technician in the display. In the case of a service code, the program menu that can be used by the brake device is
Formed in step 3 and indicated in display 4. Then, according to step 5, the selection of the test program or service program is made as a function of the read code, in which case, subsequently, in step 6, the selected test program or service program (9, 13) Is started.

When in a factory, the service diagnostic device 10
2 provides a technician with a method of manually controlling the brake device via an input unit (not shown). The service program 9 is therefore read from the memory 8 and is controlled by the service diagnostic unit 1 via the interface 15 via the control unit 19 of the braking device.
Is transmitted to Such an inspection program is, for example, a program in which a technician can engage in the control of the brakes on the premises when the energy storage device of the braking device has to be disconnected. For example, the parking brake function can be released to keep the vehicle rotatable for factory operation. Brake control unit 19
Stores the corresponding error message in the memory 30 at this time. If, for example, the brake linings of the wheel brakes have to be renewed, the electromechanical brake actuator is likewise reset by the service program for each individual wheel or for each individual axle. After the service operation has been completed, a predetermined test program 9 is selected by the service diagnostic unit 1 and a final function test is automatically performed, which erases an error message written, for example, regarding the parking brake function. The function test of the brake device is performed as described above.

In addition to being used in electromechanical braking systems, the solution according to the invention is used for other electrically controllable braking systems, for example electrohydraulic or electropneumatic braking systems. The above-mentioned advantages can also be obtained in

[0020]

The solution according to the invention improves the method of diagnosis and the service of an electrically controlled braking device, in particular an electromechanical braking device.

The control device of the brake system constantly monitors all components in order to ensure the braking function and stores the detected errors in an error memory, which are detected via a predetermined diagnostic interface. Readable.

[0022] Furthermore, it is advantageous that all the information stored relates to technical coding (for example the type of error) and temporal coding (for example at the time of storage).

It is particularly advantageous for the service memory to store the specific equipment of the brake system to be investigated, for example the type of actuator used, the respective software level, etc. This information is also readable via the diagnostic interface. It is furthermore advantageous that this information can be supplemented or changed externally, which supports the serviceability of the braking device.

It is particularly advantageous that, in the event of a fault and / or a service request, the control unit of the braking device notifies the driver of this and the corresponding information is stored in a memory.

Furthermore, it is particularly advantageous for the diagnostic device or the service device to call and start the appropriate service program and test program for the respective brake device on the basis of the information about the brake device stored in the storage device. It is.

In general, the solution according to the invention provides an advantageous, on-demand and cost-effective software support in the maintenance or service of an electrically controlled braking device.

The use of this solution in a braking device with an electromechanical clamping device requires that sufficient diagnostic and service methods (for example, an inspection program can provide an important premise for service work). It is particularly advantageous because it is provided.

[Brief description of the drawings]

FIG. 1 shows a schematic diagram of a control device for an electromechanical brake with an error memory and a service memory which can be connected to a diagnostic device or a service device via a diagnostic interface, ie an improved diagnosis or monitoring of the electromechanical control device. FIG. 1 is a system diagram of a diagnostic device or a service device that makes it possible.

[Explanation of symbols]

 1 Service Diagnosis Unit 2, 3, 5, 6 Step 4, 31 Display 7 Energy Source 8 Storage Device (Service Program Memory) 9 Service Program 11 Inquiry 12 Code 13 Inspection Program 14 Storage Device (Error Program Memory) 15 Interface 16 Real Time Clock 17 service code 18 error code 19 control unit 20 calculation unit (driver's brake request) 21-24 actuator 25-28 wheel brake 29 storage device (service memory) 30 storage device (error memory) 31 driver information display 100 electromechanical brake Device 102 Service diagnostic device

Claims (9)

[Claims] A control unit (19) operates actuators (21 to 24) as a function of a driver's braking desire (20), said control unit (19) being located in at least one storage device (29, 30). Error information and / or service information are stored, and the service diagnostic device (102) is stored via the interface (15).
The diagnostic method of the electric brake device to which the control unit (19) is connectable.
5) the stored information is stored in the service diagnostic device (10).
2), wherein the control unit (19) stores the inspection program and / or the service program in order to execute an inspection step from the service diagnostic device (102) via the interface (15). A method for diagnosing an electric brake device, characterized in that it receives changed information and / or new information for receiving and / or writing in the storage device as a function of the received information. 2. The method according to claim 1, wherein said braking device is an electromechanical braking device. 3. The information according to claim 1, wherein the information is information on the type and / or equipment of the brake device, and the information is readable, changeable or supplementable via the interface (15). The method according to claim 1. 4. The method according to claim 1, wherein the information stored in the storage device is stored together with time information holding a storage time. 5. Driver information (31) is provided for instructing a driver of an error, wherein the driver information (31) is activated only in the event of an error that limits the braking capacity or the effectiveness of the brake. The method according to any one of claims 1 to 4, characterized in that: 6. An inspection program or service program for performing a function test of said brake system, for releasing a parking brake function and for pulling a brake lining of at least one wheel away from a brake disk or a brake drum. 6. A method as claimed in any one of the preceding claims, wherein the method is used to do any combination of these. 7. A service diagnostic device (102) can be coupled to the control unit (19) of the electric brake device via an interface (15), and said service diagnostic device (102) via said interface (15). Read the stored information regarding error conditions and / or service information.
02), wherein the service diagnostic device (102) selects an inspection program or a service program based on the read error code or service code or both, and A diagnostic method for an electric brake device, wherein an inspection program or a service program is transmitted to the control unit (19) of the electric brake device (100) via the interface (15). 8. The wheel brake actuator (21 to 2) as a function of the driver's braking desire (20).
4) a control unit (19) for controlling the electric brake device for operating the electric brake device, and a storage device (29, 30) for storing error information and / or service information by the control unit (19). A diagnostic device for an electric brake device, comprising a service diagnostic device (102) connectable to the control unit (19) via an interface (15), the diagnostic device including the interface (15); The interface (1
5) the stored information is stored in the service diagnostic device (10).
2) wherein the control unit (19) stores a test program and / or a service program for executing a test step from the service diagnostic device (102) via the interface (15). Diagnostic device for an electric brake device, which receives changed information and / or new information for writing in the storage device, or both, or performs both of the above. 9. A service diagnostic device (102) can be coupled via an interface (15) to a control unit (19) of an electric brake device, said service diagnostic device (102) being located in said control unit (19). A diagnostic device for an electric brake device including the service diagnostic device (102), including means (1) for reading an error code and / or a service code written in the interface via the interface (15); The diagnostic device (102) is connected to the storage device (8, 1).
4) wherein an inspection program or a service program is read from the storage device (8, 14) as a function of the read code, and the inspection program or the service program is read via the interface (15). A diagnostic device for an electric brake device, which is transmitted to the control unit (19) of the brake device.