WO2014005771A1

WO2014005771A1 - Vehicle diagnostic device for ascertaining a requirement for a check of at least one motor vehicle component, and vehicle diagnostic method for ascertaining a requirement for a check of at least one motor vehicle component

Info

Publication number: WO2014005771A1
Application number: PCT/EP2013/061293
Authority: WO
Inventors: Patric FINKBEINER; Dominik Ebert
Original assignee: Robert Bosch Gmbh
Priority date: 2012-07-06
Filing date: 2013-05-31
Publication date: 2014-01-09
Also published as: DE102012211787A1

Abstract

The invention relates to a vehicle diagnostic device (100) for ascertaining a requirement for a check of at least one motor vehicle component, comprising: a receiving device which is designed to receive and provide a specified component state for the at least one motor vehicle component; an ascertaining device (20) which is designed to ascertain an actual component state of the at least one component; a comparison device (30) which is coupled to the receiving device and the ascertaining device (20) and which is designed to compare the provided specified component state of the at least one component with the ascertained actual component state of the at least one component and thus ascertain a comparison result; and a decision device which is coupled to the comparison device (30) and which is designed to ascertain the requirement for the check of the at least one motor vehicle component using the comparison result.

Description

Description title

A vehicle diagnostic device for determining a need for a review of at least one component of a motor vehicle and vehicle diagnostic method for determining a need for a review of at least one component of a motor vehicle

The invention relates to a vehicle diagnostic device for determining a need for a review of at least one component of a motor vehicle and a vehicle diagnostic method for determining a need for a review of at least one component of a motor vehicle.

State of the art motor vehicles are periodically, usually after one

given mileage or after a certain time interval one

Inspection, which serves to verify the functionality of the motor vehicle. The aim of the inspection is to prevent safety risks and to ensure high value retention of the motor vehicle. Many motor vehicle manufacturers have specifications on how often and to what extent an inspection is to be carried out. It can

Inspections may be coupled with certain warranty

The list of vehicle components to be checked is not motor vehicle-specific in the current state of the art, that is to say that frequently occurring fault patterns are not checked more intensively in one model than in another model for which the specific fault pattern is of less relevance. Thus, the inspection is inefficient in the state of the art because errors can easily be overlooked or too much effort is invested in improbable defects. Special diagnostic devices are used to diagnose faults in a motor vehicle. These read the fault memory of the motor vehicle and can test vehicle functions to a limited extent. Software supports the workshop staff in troubleshooting. Usually, a symptom, a so-called 5 DTC, Digital Trouble Code, too German, digital error code, can not be clearly assigned to an error, but indicate various errors.

DE 195 437 84 A1 describes a device for recording, displaying and outputting data in the context of a vehicle diagnosis, a portable unit with a receiver for wirelessly transferrable data signals, a screen for

Representation of data and / or information about data, and a transmitter for the delivery of wirelessly transferable data signals.

DE 197 25 916 A1 discloses a computer-aided diagnostic device and a

5 diagnostic method for electronically controlled systems, in particular for electronically controlled systems in a motor vehicle, known. This diagnostic device comprises computers of the second kind, which can exchange current data and programs with a computer of the first type at any time via networks based on Internet technology. o Are on the computer of the first kind of the diagnostic device described therein

Diagnostic programs and diagnostic data, such as updated information on the respective vehicle type or model series stored. In the computers of the second type of the diagnostic device described therein, dynamically loadable libraries are stored, around which a diagnostic program downloaded from the computer of the first type is expanded and enabled to intervene in the electronically controlled systems for diagnostic purposes.

In this way, determined real-time data of the electronically controlled systems of the diagnostic device described therein are processed on the computers of the second type of the extended diagnostic program, displayed on request and stored in the computer o second type or transferred to the computer of the first kind.

Disclosure of the invention

The present invention provides a vehicle diagnostic apparatus for determining a need for a review of at least one component of a motor vehicle, comprising: a receiver configured to receive and provide a predetermined component status for the at least one component of the motor vehicle; a detection device which is designed determine an actual component state of the at least one component; a comparison device, which is coupled to the receiving device and the determining device and which is designed to compare the provided predetermined component state of the at least one component with the determined actual component state of the at least one component and thereby to determine a comparison result; and one

Decision device, which is coupled to the comparison device and which is designed to determine the need for the verification of the at least one component of a motor vehicle based on the comparison result.

Further, the present invention provides a vehicle diagnostic method for determining a need for a review of at least one component of a vehicle

Motor vehicle having the following method steps: receiving and providing a predetermined component state for the at least one component of the

Motor vehicle; Determining an actual component state of the at least one component; Comparing the predetermined component state of the at least one component with the determined actual component state of the at least one component for determining a comparison result; and determining the need to review the at least one component based on the comparison result.

Advantages of the invention

The core of the invention is a vehicle diagnostic device for determining a need for a review of at least one component of a motor vehicle with: a

Receiving device which is adapted to receive and provide a predetermined component state for the at least one component of the motor vehicle; a determining device which is designed to determine an actual component state of the at least one component; a comparison device, which with the receiving device and the

Determining means is coupled and which is adapted to compare the provided predetermined component state of the at least one component with the determined actual component state of the at least one component and thereby to determine a comparison result; and one

Decision device, which is coupled to the comparison device and which is designed to determine the need for the verification of the at least one component of a motor vehicle based on the comparison result. The vehicle diagnostic device generates motor vehicle-specific inspection specifications for the respective motor vehicle by determining the need for checking the vehicle components and thereby achieves a reduction of the effort in the vehicle inspection. Only those components for which a need for verification has been determined are checked.

The main advantage of such a vehicle diagnostic device for determining the need for the review lies in the determination of the need for early diagnosis and thus in the possibility of saving unnecessary diagnostic steps.

Thus, in a motor vehicle inspection of the motor vehicle, the inspection objectives, such as the avoidance of failures of components of the motor vehicle and the preservation of the value of the motor vehicle, can be better achieved.

The idea of the present invention is to place individual components at the center of the diagnosis in order to obtain detailed information about the components of the motor vehicle from the "active trouble shooting", in short ATS process, for example "active fault finding process" and to identify any premature need for a review of the component based on different causes.

Advantageous embodiments and developments emerge from the

Subclaims and from the description with reference to the figures.

According to one embodiment of the invention, it is provided that the predetermined component state of the at least one component of the motor vehicle is formed by a predetermined operating time and / or by a predetermined mileage and / or by a predetermined component state of a further component influencing the function of the at least one component, and the actual component state of the at least one component of the

Motor vehicle is formed by an actual operating time and / or by an actual mileage of the at least one component of the motor vehicle and / or by the actual component state of the function of the at least one component affecting further component. This advantageously makes it possible to determine the need for diagnosis based on easily determined operating parameters of the components. According to one embodiment of the invention it is provided that changing means are provided which the predetermined component state of the at least one component of the motor vehicle depending on one of the at least one

Modify component of the motor vehicle associated error image. This allows advantageously that by the modified associated error image

motor vehicle-specific errors from the vehicle diagnostic device more efficient, d. H. without unnecessary testing steps, can be found.

According to one embodiment of the invention, it is provided that the provided predetermined component state of the at least one component of the

Motor vehicle is modifiable by one of the at least one component of the motor vehicle associated error pattern and that the determined actual

Component state of the at least one component of the motor vehicle with the modified by the error image provided predetermined component state of the at least one component of the motor vehicle is comparable. This allows end users to benefit from faster repair and increase customer satisfaction. Further, changes in the predetermined component state allow implementing a learning function and forming the vehicle diagnostic device as a self-learning system.

According to a further embodiment of the invention, it is provided that the error image associated with the at least one component depends on a

actual component state of another, a function of the at least one component affecting component. This can be a reliable

Determination of a diagnostic requirement can be ensured.

According to one embodiment of the invention, it is provided that the error image assigned to the at least one component is dependent on data on warranty returns of the motor vehicle or data on failures of the at least one component or data on vehicle tests of the motor vehicle. As a result, a reliable determination of a diagnostic requirement can be ensured.

According to a further embodiment of the invention it is provided that the

Vehicle diagnostic device further comprises a display device, which is adapted to the need of checking the at least one component of

Motor vehicle display. As a result, the need for checking the at least one component can be conveniently displayed in the workshop. According to a further embodiment of the invention it is provided that the

Vehicle diagnostic device further comprises a first interface device, which is coupled to the receiving device and an external database and which is adapted to retrieve a predetermined component state for the at least one component of the motor vehicle from the external database and transmit it to the receiving device. This allows use of predetermined component states stored in external databases and saves

Storage space in the vehicle diagnostic device. According to a further embodiment of the invention it is provided that the

Vehicle diagnostic device further comprises a second interface device, which is coupled to the comparison device and which is adapted to forward the need of checking the at least one component of the motor vehicle. Error messages of the vehicle diagnostic device can then later advantageous by a specialist or service workshop on the standardized

Interface device to be queried.

According to a further embodiment of the invention it is provided that the

Vehicle diagnostic device further comprises a memory device which is adapted to the predetermined component state for the at least one

Store and provide component of the motor vehicle. This advantageously allows the secure storage of the data to the given and the

actual component states and quick access in case of a new need.

The described embodiments and developments can be combined with one another as desired.

Further possible refinements, developments and implementations of the invention also include combinations of previously or not explicitly mentioned combinations

The following with respect to the embodiments described features of the invention.

Brief Description of the Drawings The accompanying drawings are provided to provide further understanding of the embodiments of the invention. They illustrate embodiments and, together with the description, serve to explain principles and concepts of the invention. Other embodiments and many of the stated advantages will become apparent with reference to the drawings. The illustrated elements of the drawings are not necessarily shown to scale to each other.

Show it:

Fig. 1 is a schematic representation of a flowchart of the

A vehicle diagnostic method for determining a need for a

Checking at least one component of a motor vehicle according to an embodiment of the invention;

Fig. 2 is a schematic representation of a vehicle diagnostic device for

Determining a need for a review of at least one component of a motor vehicle according to another

Embodiment of the invention; and

Fig. 3 is a schematic representation of a with a database device

coupled vehicle diagnostic device for determining a need for a review of at least one component of a motor vehicle according to another embodiment of the invention.

In the figures of the drawing, like reference numerals designate the same or functionally identical elements, components, components or method steps, unless indicated otherwise. It is further understood that components and elements in the drawings are not necessarily to scale to each other for clarity and clarity.

FIG. 1 shows a schematic representation of a flow chart of the FIG

A vehicle diagnostic method for determining a need for a review of at least one component of a motor vehicle according to an embodiment of the invention.

The vehicle diagnostic method for determining a need for a review of at least one component of a motor vehicle includes the following

Steps: As a first method step, receiving S1 and providing a predetermined component state for the at least one component of the

Motor vehicle. As a second method step, a determination S2 of an actual

Component state of at least one component. The determination S2 of the actual component state of the at least one component can take place by means of an evaluation of a generated error code. The error code is generated when a malfunction has been detected in the at least one component of the motor vehicle by an error message.

The error code includes, for example, a number, but may also have a string. The decisive criterion is the uniqueness of the error code of the at least one component of the motor vehicle to avoid confusion.

As a third method step, a comparison S3 of the predetermined

Component state of at least one component with the determined

actual component state of the at least one component for determining a comparison result.

As a fourth method step, a determination is made of the need for the verification of the at least one component S4 on the basis of the comparison result.

For example, as the predetermined component state, one each

predetermined operating time and / or a predetermined mileage for a

Component of the motor vehicle to be stored.

Furthermore, as the predetermined component state in the database, an error image of each component of the motor vehicle can be stored. In the error image, the respective dependent components are assigned to the respective component.

The sum of all given component states of the components of the

Motor vehicle may be stored in a storage device 15 as a vehicle state of the motor vehicle.

Likewise, an existing one of the vehicle diagnostic device 100

Vehicle condition of the motor vehicle based on all achieved

Component states of the components of the motor vehicle can be determined. The vehicle diagnostic method for determining the need for the review of the at least one component of the motor vehicle may also be repeated in a recursive or iterative manner to refer to a plurality of components of the vehicle

Motor vehicle to be applied and accordingly to determine a need for a review of a plurality of components.

In this case, a subset of the checked components of the motor vehicle can be generated, which includes those components of the motor vehicle, which have a need for verification.

2 shows a schematic representation of a vehicle diagnostic device for a plurality of components of a motor vehicle according to another

Embodiment of the invention.

A vehicle diagnostic device 100 for determining a need for a review of at least one component of a motor vehicle includes a

Receiving device 10, a determining device 20, a comparison device 30 and a decision device 35th

The vehicle diagnostic device 100 is designed, for example, as a microcontroller, also μΟοηίΓθΙΙβΓ, which in addition to a processor and units for

Peripheral functions united on one chip. The receiving device 10 is designed to receive and provide a predetermined component state for the at least one component of the motor vehicle.

The determining device 20 is designed to be an actual

Determine the component state of at least one component.

The comparison device 30 is adapted to the provided predetermined component state of the at least one component with the determined

Compare the actual component state of at least one component and thereby determine a comparison result. The decision device 35 is coupled to the comparison device 30 and designed to determine the need for checking the at least one component of a motor vehicle based on the comparison result. Furthermore, the vehicle diagnostic device 100 may have a first interface device 50, which is coupled to the receiving device 10 and an external database 300 and which is designed to retrieve a predetermined component state from the external database 300 for the at least one component of the motor vehicle and to the receiving device 10 transferred to.

In addition, in the vehicle diagnostic apparatus 100, a second

Interface device 60 may be provided, which is coupled to the comparison device 30 and which is adapted to the need to check the at least one component of the motor vehicle to a to the

Vehicle diagnostic device 100 to pass coupled external tester.

The first interface device 50 and the second interface device 60 may be configured as a parallel or serial hardware interface. The vehicle diagnostic device 100 may further include a memory device 15, which is configured to store the predetermined component state for the at least one component of the motor vehicle, and thus

provide. In the memory device 15 can be stored for each component of the motor vehicle in each case a predetermined operating time and / or a predetermined mileage. The memory device 15 may be formed as a data memory, the

having microelectronic memory structures in a semiconductor. For example, a display device 40 is for indicating the need of

Review of at least one component of the motor vehicle provided. The display device may be as a liquid crystal display or as a

Liquid crystal screen to be formed, whose function is based on that

Liquid crystals affect the polarization direction of light when a certain level of electrical voltage is applied.

Further, the vehicle diagnostic device 100 may include changing means 45 that satisfies the predetermined component state of the at least one component of the Motor vehicle dependent on one of the at least one component of

Change motor vehicle associated error image. The changing means 45 are for this purpose for example coupled to the receiving device 10 and the determining means 20. In this case, the changing means 45 can also access the memory device 15 integrated in the receiving device 10 and thus the predetermined one

Change the component state of at least one component.

The changing means 45 can further with a third, not shown

Interface device to be coupled, which allows communication with external database systems, also not shown. These external

Database systems may include data on warranty returns of the motor vehicle or failure data relating to the components of the motor vehicle or data about

Have motor vehicle tests of the motor vehicle.

The changing means 45 are designed, for example, as a processor unit or as another electronic data processing unit.

The receiving device 10, the determining device 20, the comparison device 30, the decision device 35 and the changing means 45 are embodied, for example, as network-connected computer units.

FIG. 3 shows a schematic illustration of a vehicle diagnostic device coupled to a database for a plurality of components of a motor vehicle according to a further embodiment of the invention.

The vehicle diagnostic apparatus 100 accesses an external one coupled thereto

Database 300, in the specific error images of vehicles are stored.

This permits the vehicle-specific evaluation of the specific fault patterns in the external database 300, in the operating periods of vehicle components and / or given mileages of predetermined as component states

Vehicle components and / or component states of the respective component influencing components are stored.

As a result, if a motor vehicle of a particular model of a particular brand has a recurring failure in a particular component, the vehicle diagnostic apparatus 100 may be predetermined

Component state of the respective component and / or the given Change the component state of a component influencing the function of the respective component accordingly.

The error images may be implemented as a data table for error probabilities of the respective vehicle components. The error images also include, for example, error patterns for individual vehicle components or components of the

Motor vehicle, that is the error probability of the respective

Vehicle components are dependent on failures in a functional relationship with those of the respective vehicle components

Vehicle components or components of the motor vehicle.

The data tables can be generated by the vehicle diagnostic device 100, for example via the evaluation of data collected by means of a diagnostic software. However, other forms of data acquisition are also possible, for example by evaluating error data 200 via warranty returns or from error data 200 via field failures or from error data 200 from vehicle tests.

The data tables can also contain data from the functional development of the

Include vehicle components and employ qualitative diagnostic models or automated generated on-board diagnostics. This offers the advantage that the

Diagnostic modeling is accelerated, because the collection of empirical data can be omitted.

The error data 200 is evaluated by the vehicle diagnostic device 100 using a suitable statistical method. On the basis of the error data 200, fault images can thus be calculated for each individual vehicle component.

As a result of the evaluation of the vehicle diagnostic device 100, for example, a specification based on the defect images for the vehicle components or components of the motor vehicle to be inspected during the inspection is created.

This guideline can be adapted to specific aspects that are relevant for the occurrence of errors. For example, parts which often have a defect only after a certain period of operation or mileage of the motor vehicle can only be checked if this is relevant.

For example, a certain motor vehicle after a certain mileage of 120,000 km vulnerable to errors in the environment of the coupling device of the motor vehicle. This is in the model-specific inspection of the motor vehicle of the

Vehicle diagnostic device 100 explicitly considered.

As a result, the vehicle diagnostic apparatus 100 determines as the default one

Component state of the coupling device of the motor vehicle in the

Memory device 15 a predetermined mileage of 100,000 km for the

Clutch device stored, which is reduced for example by a safety margin of 20,000 km compared to the value of 120,000 km, to ensure safe operation of the coupling device of the motor vehicle during the specified mileage.

Furthermore, an electrical energy store in the form of a lithium-ion battery of the motor vehicle can have a specific calendar life, for example a period of four years. The life of the lithium-ion battery describes how long the lithium-ion battery of the vehicle without a noticeable

Power loss can be used. Consequently, the vehicle diagnostic apparatus 100 stores, as the predetermined component state or the predetermined operation period of the lithium ion battery in the memory device 15, a period of four years or less for the lithium ion battery of the vehicle.

Thus, from the vehicle diagnostic device 100 is continuously achieved

Operating time of the lithium-ion battery with the storage device in the 15th

stored periods of four years compared so that the lithium-ion battery can be replaced before the end of its expected life. Depending on the type of vehicle, the service life of the lithium-ion battery may vary, for example due to a different conditioning of the lithium-ion battery in the respective vehicle type or due to a different load of the lithium-ion battery in the motor vehicle. For example, a defect image of a coolant pump of the motor vehicle comprises a

Dependence of the probability of error or of the component state of the coolant pump on a V-belt driving the coolant pump

Motor vehicle. Furthermore, the predetermined component state can be adaptable to a malfunction of a component influencing the at least one component. Thus, in case of failure or defect of the V-belt a predetermined mileage than predetermined component state of the coolant pump of 130,000 km

For example, 5,000 km can be reduced to 125,000 km.

Alternatively, an immediate need for a diagnosis of the coolant pump by the vehicle diagnostic device 100 may be determined if as a predetermined

Component state of the coolant pump, a predetermined component state of the function of the coolant pump influencing V-belt is selected.

The predetermined component state of the V-belt is chosen, for example, as a V-belt defect. If a V-belt is detected as the actual component condition of the V-belt, then the actual

Component state of the V-belt to the predetermined component state of the V-belt and thus corresponds to the actual component state of the belt

Coolant pump the predetermined component state of the coolant pump, so that a diagnosis requirement for the coolant pump is detected immediately.

In addition, it may be provided that several component states for the

Specify coolant pump and then determine a diagnostic need, if at least one of these predetermined component states is achieved by the corresponding actual component state.

In doing so, the vehicle diagnostic device 100 may perform a simultaneous check or a sequential check of the multiple component states. The checking of a particular subset of the multiple component states is also contemplated and may also be performed simultaneously or sequentially by the vehicle diagnostic device 100.

For example, as the predetermined component state of the coolant pump of the motor vehicle, a predetermined operating time of the coolant pump of a maximum of 8 years and then a predetermined mileage of the coolant pump of a maximum of 80,000 km can be checked by the vehicle diagnostic device 100.

Likewise, by the vehicle diagnostic device 100 as the predetermined

Component state a predetermined component state of the function of the coolant pump influencing further component - for example, the function of the V-belt - and then a predetermined operating time of

Coolant pump of a maximum of 8 years to be tested. In another example, the vehicle diagnostic device 100 may be configured to determine a need for a review of at least one component of a vehicle

Motor vehicle - in the present case again the coolant pump of the motor vehicle - proceed as follows:

For example, as the predetermined component state of the coolant pump of the motor vehicle, a predetermined mileage of the coolant pump of 80,000 km may be checked with an actual component state of the coolant pump of 70,000 km, and consequently no diagnostic need for the coolant pump may be initially determined by the vehicle diagnostic device 100.

Subsequently, as the predetermined component state of the coolant pump of the motor vehicle, a predefined operating time of the coolant pump of a maximum of 8 years can be checked with an actual component state of the coolant pump of 7 years and consequently also no diagnostic requirement for the coolant pump can be determined by the vehicle diagnostic device 100.

Then, as the predetermined component state of the coolant pump of the vehicle, a predetermined component state of the V-belt as a predetermined component state of a function of the coolant pump

influencing further component to be checked. As actual

Component condition of the V-belt while a defective V-belt is determined and checked with the predetermined component state. Consequently, this is a

Diagnostic needs for the coolant pump determined by the vehicle diagnostic device 100.

According to a further embodiment it is provided that data about

Guarantee returns of the motor vehicle concerning the coolant pump or regarding the failure data of the coolant pump or data on vehicle tests of the

Motor vehicle to be evaluated regarding the coolant pump and that, depending on the evaluation of the coolant pump associated error pattern is adjusted or changed if necessary. For example, if there are frequent returns to warranty at a mileage of

Motor vehicle of less than 80,000 km due to a defect of the coolant pump or the coolant pump driving V-belt, then the default Change the component state of the coolant pump to a mileage of the coolant pump, for example, 70,000 km.

The same results from the evaluation of failure data, which are determined for example in a network of workshops, or from the evaluation of independent vehicle tests.

Likewise, for example, in the error images of an alternator of the motor vehicle or a hydraulic pump of the motor vehicle or a power steering pump for

Power steering of the motor vehicle dependencies to which the respective

Vehicle components driving V-belt noted.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto, but modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention.

Claims

claims

A vehicle diagnostic apparatus (100) for determining a need for a vehicle

Checking at least one component of a motor vehicle with:

- A receiving device (10) which is adapted to receive and provide for the at least one component of the motor vehicle, a predetermined component state;

- A determination device (20) which is adapted to determine an actual component state of the at least one component;

- A comparison means (30) which is coupled to the receiving means (10) and the determining means (20) and which is adapted to the provided predetermined component state of the at least one

Compare component with the determined actual component state of at least one component and thereby determine a comparison result; and

- a decision device (35), which is coupled to the comparison device (30) and which is adapted to the need for the review of the at least one component of a motor vehicle on the basis of

To determine the comparison result.

2. Vehicle diagnostic device (100) according to claim 1,

characterized,

that the predetermined component state of the at least one component of the motor vehicle by a predetermined operating time and / or by a predetermined mileage and / or by a predetermined

Component state of the function of the at least one component influencing further component is formed; and

the actual component state of the at least one component of the motor vehicle is formed by an actual operating time and / or by an actual mileage of the at least one component of the motor vehicle and / or by the actual component state of a further component influencing the function of the at least one component.

3. A vehicle diagnostic device (100) according to claim 1,

characterized,

that changing means (45) are provided, which correspond to the given

Change the component state of at least one component of the motor vehicle depending on one of the at least one component of the motor vehicle associated error.

4. Vehicle diagnostic device (100) according to claim 3,

characterized,

in that the error image assigned to the at least one component is dependent on an actual component state of another component influencing a function of the at least one component.

5. Vehicle diagnostic device (100) according to one of claims 3 and 4, characterized

in that the fault pattern assigned to the at least one component is dependent on data on warranty returns of the motor vehicle or data on failures of the at least one component or data on vehicle tests of the motor vehicle.

6. Vehicle diagnostic device (100) according to one of the preceding claims, characterized in that

in that the vehicle diagnostic device (100) further comprises a display device (40) which is designed to indicate the need for checking the at least one component of the motor vehicle.

7. Vehicle diagnostic device (100) according to one of the preceding claims, characterized in that

in that the vehicle diagnostic device (100) further comprises a first

Interface device (50) which is coupled to the receiving device (10) and an external database (300) and which is adapted for the at least one component of the motor vehicle to retrieve a predetermined component state from the external database (300) and to the receiving device (10) to transfer.

8. Vehicle diagnostic device (100) according to one of the preceding claims, characterized in that in that the vehicle diagnostic device (100) further has a second interface device (60) which is coupled to the comparison device (30) and which is designed to forward the need for checking the at least one component of the motor vehicle to an external unit.

9. Vehicle diagnostic device (100) according to one of the preceding claims, characterized in that

in that the vehicle diagnostic device (100) further has a memory device (15) which is designed to store and provide the predetermined component state for the at least one component of the motor vehicle.

10. A vehicle diagnostic method for determining a need for a review of at least one component of a motor vehicle with the following method steps:

- receiving (S1) and providing a predetermined component state for the at least one component of the motor vehicle; Determining (S2) an actual component state of the at least one

Component;

Comparing (S3) the predetermined component state of the at least one component with the determined actual component state of the at least one component for determining a comparison result; and

- determining (S4) the need for the verification of the at least one

Component based on the comparison result.

1 1. A vehicle diagnostic method according to claim 10,

characterized,

Component state of a function affecting the at least one component further component are formed; and

that the actual component state of the at least one component of the motor vehicle by an actual operating time and / or by a actual mileage of the at least one component of the motor vehicle and / or by the actual component state of the function of the at least one component influencing further component can be selected.

12. A vehicle diagnostic method according to claim 10,

characterized,

the provided predetermined component state of the at least one component of the motor vehicle is modified by an error image associated with the at least one component of the motor vehicle; and

in that the determined actual component state of the at least one component of the motor vehicle is compared with the predetermined component state of the at least one component of the motor vehicle modified by the error picture in order to determine the need for checking the at least one component.

13. Vehicle diagnostic device (100) according to claim 3,

characterized,

in that the error image assigned to the at least one component is formed as a function of an actual component state of a further component which influences a function of the at least one component.

14. Vehicle diagnostic device (100) according to one of claims 3 and 4, characterized

in that the fault pattern assigned to the at least one component is formed as a function of data on warranty returns of the motor vehicle or of data on failures of the at least one component or of data on vehicle tests of the motor vehicle.

15. Computer program product, which causes the execution of a vehicle diagnostic method according to one of claims 10 to 14 on a program-controlled device.