KR20030048598A - Self diagnostic apparatus for automobile and diagnosis method using the same - Google Patents

Abstract

PURPOSE: A self-diagnosis device of vehicle and diagnosis method using the same is provided to perform self-diagnosis function regardless of the kind of the vehicle. CONSTITUTION: An input/output unit(30) is interfaced with a connector(20) connected to a plurality of Electronic Control Units(ECU)(10), and a terminal(70). A central processing unit(40) performs the processes of: scanning each ECU, and storing the information on communication protocol to each ECU in a memory(50); using the information on the communication protocol, communicating with each ECU, and receiving diagnosis code from the ECU; outputting the diagnosis code to the terminal with graphic interface.

Description

Self diagnostic apparatus for automobile and diagnosis method using the same

The present invention relates to a diagnostic apparatus for outputting a self-diagnosis code in an automobile having at least one electronic control unit (ECU). In particular, the communication protocol of a plurality of electronic control units (ECUs) mounted in the vehicle is a type of automobile. Check the communication protocol for each electronic control unit (ECU) by scanning automatically, regardless of the vehicle type, etc.) and use the corresponding communication protocol to check the diagnostic code output from each electronic control unit (ECU) based on this. The present invention relates to a vehicle self-diagnosis device capable of receiving a transmission and notify the driver in a form (visual or auditory) that can be recognized by the driver, and a self-diagnosis method using the same.

Most automobiles currently on the market include: an engine ECU (Engine ECU) for receiving detection signals from various sensors and controlling the operation of the engine based on the detection signals; A / TM ECU (Automatic Transmission ECU) for controlling the operation of the automatic transmission; There are many electronic control units (ECUs) such as anti-lock break system (ABS) ECUs that control the operation of the brakes. Each of the plurality of electronic control units (ECU) as described above has a self diagnosis function using a micro computer, and thus detects a state of a function of a device to be diagnosed and then corresponds to a diagnosis. The code is stored in the internal memory, and the diagnostic code stored in the electronic control unit (ECU) is output to the outside by various methods. At this time, the electronic control unit (ECU) outputs a diagnostic code according to a predetermined protocol (for example, DTC code system), and outputs a predetermined diagnostic code based on the fact that the diagnostic code system is stored in a predetermined storage medium. Will be stored in its own memory.

Automotive diagnostic devices belong to the power / wire harness diagnosis, and are generally classified into on board diagnosis I and off board diagnosis II.

On-board Diagnosis continuously diagnoses the abnormality of the device to be diagnosed in the ECU, and if any abnormality occurs, it operates the backup or fail safe function, processes it, and codes the data of the failure to provide itself. The offboard diagnosis system is a fault diagnosis device installed in a repair shop or a service shop that reads out the diagnosis code stored in the onboard diagnosis and outputs maintenance instructions. It is a device that makes it easy to diagnose and repair a vehicle by continuously and automatically diagnosing the status of a diagnosis target device.

Such a conventional vehicle diagnostic apparatus has a problem in that it is possible to read the diagnostic code value only by connecting an offboard diagnosis system installed at a service factory with an abnormality of the vehicle detected by the onboard diagnosis. In other words, the onboard diagnosis and the offboard diagnosis are separated from each other, so it is impossible to know whether the car is abnormal until the driver visits the service factory and decodes the diagnosing code. There was a problem that can not be done. In addition, it is not possible to take prompt measures for various abnormalities occurring during driving, and must visit a repair shop, and a measurement device provided at the repair shop has a problem in that it is not possible to accurately identify a failure symptom of a car generated while driving.

In addition, by using a self-diagnostic device that is portable to the output of the self-diagnosis output device connected to the vehicle, the device enables the light bulb and the buzzer to operate simultaneously according to the trouble code signal corresponding to the broken part so that the failure code can be detected in the car. Has been developed, but there is a problem that increases the inconvenience of use because the diagnostic code for each manufacturer is displayed differently for the same system and the same diagnostic output.

When the GPS receiver and the wireless communication device are installed in the car to transmit the state of the car to the control station through the wireless communication device, the control station makes a database of the state of the car transmitted through the wireless communication device and manages the database. When it is determined that a problem has occurred, a remote diagnosis device has been developed to notify the driver and to perform the corresponding processing operation. However, the remote diagnosis device has a problem that the device is complicated and expensive because the GPS receiver and the wireless communication device must be installed. In addition, the remote diagnosis device has a problem that the driver can not know the diagnostic information directly, and must know the diagnostic information only through the car repair shop.

The present invention has been made to solve the above-mentioned conventional problems, the object of the present invention is to self-diagnosis vehicle according to the present invention to a connector coupled to the unit (ECU) in a vehicle having at least one electronic control unit (ECU) By connecting the devices, each vehicle automatically checks the communication protocols for each different unit (ECU), and the driver can easily identify by receiving the diagnostic code output from each unit using the identified communication protocol. The present invention provides a self-diagnosis apparatus for a vehicle that can be output in the form of a graphic interface or a voice alarm, and a self-diagnosis method using the same.

1 is a system block diagram of a vehicle self-diagnosis apparatus according to the present invention.

2 is a process for automatically checking the communication protocol for each electronic control unit (ECC) regardless of the type of vehicle in order to implement the self-diagnosis function of the vehicle in the vehicle self-diagnosis method according to the present invention Is a flow chart schematically showing the following.

Automotive self-diagnosis apparatus according to the present invention for achieving the above technical problem is connected to a connector to which a plurality of electronic control unit (ECU) mounted on the vehicle is connected to communicate the electronic control unit (ECU) regardless of the type of the vehicle The present invention relates to a vehicle self-diagnosis device for outputting a self-diagnosis code for a diagnosis target device through a predetermined terminal using a confirmed communication protocol after scanning the protocol in a form recognizable by a driver. More specifically, the vehicle self-diagnosis apparatus according to the present invention comprises: (a) a terminal having a plurality of electronic control units (ECUs) mounted on a vehicle, and a terminal having a graphic interface output means and an interface for code input and output; An input / output unit (I / O unit) to be formed; And (b) scanning each electronic control unit (ECU) connected to the connector through the input / output unit (I / O) in an initialization mode after power is first applied to communicate with each unit (ECU). A first process of generating type information of the protocol and sequentially storing the information in the inactive memory; In the continuous mode after the initialization mode, the communication code is stored in the inactive memory and communicates with each electronic control unit (ECU) to receive the diagnostic code of the diagnosis target device from the electronic control unit (ECU). Two processes; And a central processing unit configured to perform a third process for outputting a diagnostic code transmitted from the second process to a terminal having a display means through the input / output unit (I / O unit) through a graphic interface. It features.

In the vehicle self-diagnosis apparatus according to the present invention, an inactive document containing a communication protocol scanner program capable of reading communication protocol information for each unit by scanning an electronic control unit (ECU) in an initialization mode of the first process. Preferably, the memory unit includes a memory unit configured to include an active memory temporarily storing work data generated in the process of performing the first to third processes.

The vehicle self-diagnosis apparatus according to the present invention further includes an A / D converter which receives and receives an analog signal input to an input / output unit (I / O unit) through the connector and digitalizes the analog signal of the battery through the connector. When the voltage signal is input, the A / D converter digitally converts the analog voltage signal, and the central processing unit outputs the digitized battery voltage information to the graphic interface through the terminal.

In the present invention, the terminal comprises a liquid crystal display unit for displaying in a graphical interface to visually check the self-diagnostic code output through the input / output unit (I / O unit) under the control of the central processing unit; An alarm light for visually notifying the diagnosis state or an alarm for visually notifying the diagnosis state when the diagnosis code indicates a dangerous state of the device to be diagnosed as a result of the central processing unit determined according to a predetermined criterion; And a keypad unit capable of transmitting a predetermined process request code to the central processing unit.

According to another aspect of the present invention, there is provided a self-diagnostic method including: a terminal for outputting a self-diagnostic code output from n electronic control units (ECUs) mounted in a vehicle in a form recognizable by a driver; An input / output unit (I / O unit) for forming a signal transmission interface with a connector to which the units (ECUs) are connected and the terminal; And automatically collecting the respective communication protocol information by scanning the units (ECUs), and then reading a self-diagnosis code from the units (ECUs) based on this, and outputting the self-diagnostic code through the terminal. The present invention relates to a diagnostic method using a vehicle self-diagnosis device including a central processing unit for controlling a system process. More specifically, the self-diagnostic method according to the present invention includes (a) when communication protocol scanning events for n electronic control units (ECUs) occur, the central processing unit performs m communication for each of the n units (ECUs). The communication protocol is attempted according to a predetermined order using the protocol, and the communication protocol with a response from the unit ECU is determined to be the communication protocol of the scanning unit ECU, and communication with the unit identification information scanned in the inactive memory is completed. Matching protocol type information and sequentially storing the protocol type information in the order of scanned units (ECUs); (b) The central processing unit communicates with each other through a predetermined unit (ECU) and input / output unit (I / O unit) requiring self-diagnosis by referring to communication protocol matching information for each unit (ECU) stored in the inactive memory. Reading a self-diagnosis code from a unit ECU; And (c) outputting the self-diagnosis code read out from the central processing unit to the terminal through an input / output unit (I / O unit), the self-diagnosis code being output in a form recognizable by the driver by the terminal. It is characterized by.

In the present invention, the step (c) may include: comparing, by the central processing unit, the diagnostic code read out from the predetermined unit (ECU) with the fault diagnosis code list previously stored in the inactive memory; If the read out diagnostic code is identical to a predetermined fault diagnosis code, the central processing unit reads out the action information according to the fault diagnosis by referring to the action information storage unit for each fault diagnosis code previously stored in the inactive memory. ; And outputting, by the central processing unit, the action information according to the failure diagnosis to the terminal through an input / output unit (I / O unit) in a form recognizable by the driver.

In the present invention, in step (a), the communication protocol confirmation process of the communication unit (ECU) is performed in a predetermined order for the m communication protocols for each of the n electronic control units (ECUs). Once confirmed, the step ends.

Communication is attempted sequentially from the first address to the last address used by the applicable communication protocol (kth: 1≤k≤m) until there is a response from the unit (ECU, pth: 1≤p≤n), and scanning If there is a response from the attempted unit (ECU: pth), the corresponding address is determined as the unit (ECU: pth) address, and the scanned address is matched with the type information of the applied communication protocol (kth) and stored in the inactive memory. After that, it is preferable to terminate the communication protocol verification process of the scanned unit (ECU).

In the present invention, the application order of the m communication protocols applied in the communication protocol confirmation process for each of the n electronic control units (ECUs) is preferably determined according to the statistically popular order for the corresponding units (ECUs). Do.

In this case, the protocol refers to a communication protocol. For example, communication between people can be regarded as language. In other words, when two people try to communicate, they must have a common language or rule that they can understand. These rules in computers embedded in automobiles can be classified into KWP System, ISO System and Carb System. Therefore, in order for the driver to know the diagnostic information of the vehicle other than the diagnostic information displayed on the instrument panel, the driver must decode the protocol specified for the vehicle.

Hereinafter, the present invention will be described in detail with reference to examples, and in order to help the understanding of the present invention, it will be described in detail with reference to the accompanying drawings. However, embodiments according to the present invention may be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

1 is a system configuration diagram schematically showing the configuration of a vehicle self-diagnosis apparatus according to the present invention.

As shown in FIG. 1, the vehicle self-diagnosis apparatus according to an embodiment of the present invention is connected to a connector 20 to which a plurality of electronic control units (ECU: 10) mounted on a vehicle are connected to correlate with the type of vehicle. After scanning the communication protocol of the electronic control unit (ECU: 10), and outputs the self-diagnosis code for the diagnosis target device through a predetermined terminal 70 in a form that can be recognized by the driver using the identified communication protocol. .

More specifically, the vehicle self-diagnosis apparatus according to the embodiment of the present invention, the terminal 70 having a connector 20 and graphic interface output means connected to a plurality of electronic control unit (ECU: 10) mounted on the vehicle An input / output unit (I / O unit 30) forming an interface for code input and output; A central computing unit 40 for managing the overall process of the self-diagnosis apparatus for a vehicle according to the present invention; The protocol scanner program, which is a program that performs the automatic confirmation process for the communication protocol of the electronic control unit (ECU: 10), is included. Data is not lost even when the power is not applied, but the data can be changed by an electromagnetic method. Flash memory which is an inactive memory, RAM when data is lost and RAM which is an active memory temporarily storing work data generated from the central processing unit 40 in the process of implementing the technical idea according to the present invention, and a vehicle. And a memory unit 50 configured to include ROM, which is an inactive memory in which information such as the type and the type of data is permanently stored, and data is not lost even when power is not applied.

Here, the central processing unit 40 manages the following process to implement the technical idea according to the present invention. More specifically, the central processing unit 40 is the input and output unit when the power is first applied to the vehicle self-diagnostic apparatus through a predetermined power supply unit 80 or when the user requests the progress of the device initialization mode ( Inert memory after scanning each electronic control unit (ECU: 10) connected to the connector 20 through I / O: 30 to read the type of communication protocol for each unit (ECU: 10). Proceed with a first process of sequentially storing (e.g., flash memory); In the normal use mode after the initialization mode, the communication code of each electronic control unit (ECU: 10) is mutually communicated with each other using the communication protocol information of the electronic control unit (ECU: 10) stored in the inactive memory, and the diagnostic code of the device to be diagnosed is obtained. Proceeding with the second process received from the electronic control unit (ECU: 10); Through the input / output unit (I / O: 30), a third process is performed so that the diagnostic code transmitted from the second process can be output through the graphic interface to the terminal 70 having the display means.

The self-diagnosis code is used to compare a predetermined diagnostic system (e.g., P-code system) with a predetermined code system (e.g., P code system) from a sensor value transmitted from a sensor installed in the main part of the vehicle to the unit ECU. It is a code that is generated after judging the state and stored in the memory of the electronic control unit (ECU), and then outputted when a failure state is determined at the vehicle repair station through the connector.

In some cases, the vehicle self-diagnosis apparatus according to the present invention receives the analog signal input to the input / output unit (I / O unit: 30) through the connector 20 to A / D conversion unit 60 for digital signal It may further include. In this case, when the analog voltage signal of the battery is input through the connector 20, the A / D converter 60 digitally converts the analog voltage signal and the central processing unit 40 according to a predetermined process. It is preferable that the vehicle self-diagnosis apparatus according to the present invention be configured to output the digitized battery voltage information through the terminal 70 through a graphic interface.

The terminal 70 includes a liquid crystal display that displays a graphic interface to visually check the self-diagnosis code output through the input / output unit (I / O: 30) under the control of the central processing unit 40; As a result of the determination by the central processing unit 40 according to a predetermined criterion, when the diagnostic code indicates a dangerous state of the device to be diagnosed (that is, by using the risk level information for each diagnostic code included in the inactive memory, the read-out self-diagnosis code Is a code belonging to a hazard class for which the driver is to be informed of the dangerous condition) visually indicating an alarm or an audible alarm; And a keypad capable of transmitting a predetermined command code to the central processing unit 40 to perform a progress request of a predetermined process (eg, device initialization; reading a self-diagnosis code of a specific electronic control unit (ECU) 10, etc.). It is preferable to include a part.

On the other hand, the power source 80 is transferred from the battery of the vehicle to the electronic control unit (ECU: 10) and then to the input / output unit (I / O: 30) and applied to each part of the vehicle self-diagnosis apparatus according to the present invention. Preferably, but not limited to the technical idea according to the present invention. The drawing arrangement of the power supply 80 shown in FIG. 1 is for convenience, and this illustration of the power supply 90 should not be construed as limiting the technical idea according to the present invention.

Hereinafter, the self-diagnosis process of the diagnosis target device using the device according to the present invention having the system configuration described above will be described in detail. However, assuming that the number of scanning target electronic control units (ECU: 10) is n, the number of communication protocols applied is m (all the electronic control unit (ECU: 10) communication protocols applicable in the present invention, for example, the KWP2000 protocol; ISO9142-2 protocol; the method of finding any one of the Carb protocol, etc.) is assumed. These assumptions are not intended to limit the technical spirit of the present invention, but are merely for convenience of description.

More specifically, the self-diagnosis method according to the embodiment of the present invention outputs the self-diagnosis codes output from the n electronic control units (ECUs) mounted in the vehicle in a form that can be recognized by the driver (visual or audio form). terminal; An input / output unit (I / O unit) for forming a signal transmission interface with a connector to which the units (ECUs) are connected; And automatically collecting the respective communication protocol information by scanning the units (ECUs), and then reading a self-diagnosis code from the units (ECUs) based on this, and outputting the self-diagnostic code through the terminal. It is implemented using a vehicle self-diagnosis device that includes a central processing unit to control the system process.

More specifically, first, when a communication protocol scanning event for n electronic control units (ECUs) occurs (when power is first applied or when a user requests through a keypad unit), the central processing unit is configured for each of the n units (ECUs). When communication is attempted in a predetermined order using m communication protocols and a response is received from the unit ECU, the central processing unit 40 is a communication protocol of the unit (ECU) that scans the communication protocol applied at the present time. Determined to be. Then, the scanning unit (ECU) identification information (e.g., address information) is matched with the communication protocol type information in an inactive memory (e.g., flash memory) and sequentially stored in the order of the unit (UU) being scanned. In this case, it is preferable that the order of application of the m communication protocols applied in the communication protocol confirmation process for each of the n electronic control units (ECUs) is determined according to the communication protocol order that is widely used for the corresponding units (ECUs). Do.

The communication protocol confirmation and the storage process for each electronic control unit (ECU) will be described in more detail as shown in FIG. 2.

As shown in Fig. 2, the central processing unit first selects the first electronic control unit (ECU) (step S10) and selects the first protocol according to a predetermined order (step S20). At this time, it is preferable that the order information for applying the communication protocol for each ECU is stored in an inactive memory (for example, a flash memory) of the vehicle self-diagnosis apparatus according to the present invention. Then, the first address among the addresses allocated to the first protocol is selected (step S30) and communication with the first electronic control unit (ECU) is attempted according to the contents selected in steps S10 to S30. As such, when communication is attempted, the central processing unit determines whether the first electronic control unit (ECU) responds (step S50), and branches the process to step S60 or step S70 according to the result. If the result of the determination in step S50 is that the first electronic control unit (ECU) responds to the communication using the first address, the central processing unit proceeds to step S70 to process the address of the first electronic control unit (ECU). And matching communication protocol type information to an inactive memory (eg, flash memory). However, if it is determined in step S50 that the first electronic control unit (ECU) does not respond when communicating with the first address, it is determined whether the next address is allocated to the first communication protocol (step S60). Therefore, the process branches to S80 or S90. If it is determined in step S60 that there is a next address for the first communication protocol, the process proceeds to step S80 to set the next address, and then the process proceeds to step S40 again to the first protocol using the second address. Based communication is attempted. The communication attempt by the first communication protocol by this address counting continues until the branching condition from step S50 to step S70 is obtained. On the other hand, if it is determined in step S60 that there is no next assigned address in the first communication protocol, it is determined that mutual communication with the first electronic control unit (ECU) is impossible by the first communication protocol and the process is performed in step S90. The processor determines whether the next communication protocol exists according to a predetermined order, and according to the result, the central processing unit branches the process to steps S100 to S30. If it is determined in step S90 that there is a next communication protocol in a predetermined order, the central processing unit proceeds to step S30 and attempts communication by address counting for the next communication protocol. The communication attempt with the electronic control unit (ECU) by address counting for each communication protocol continues until the branch condition from the step S50 to the step S70 is satisfied. As a result, there is a response from the communication attempt using the specific address of the specific communication protocol. When the central processing unit proceeds to step S70 and then proceeds to step S100 again, it attempts communication by address counting for each communication protocol in a predetermined order for the next electronic control unit (ECU). Since the communication protocol confirmation process for the second electronic control unit (ECU) is substantially the same as the technical idea described above, a detailed description thereof will be omitted herein. On the other hand, by applying m communication protocols to a predetermined electronic control unit (ECU) and attempting communication by address counting by performing a series of procedures as shown in FIG. 2, but there is no confirmed communication protocol, the central processing unit In step S95, error processing is performed to store unit (ECU) information whose communication protocol is not confirmed in a memory and notify it through the terminal.

After the communication protocol confirmation process for all the electronic control units (ECU) is finished as described above, after the communication protocol type information for each unit (ECU) is stored in the inactive memory, the central processing unit is sequentially stored in the inactive memory (ECU). The self-diagnosis code is read from the unit ECU by communicating with each other through the predetermined unit (ECU) and the input / output unit (I / O unit) requiring self-diagnosis with reference to each communication protocol matching information. The aspect of self-diagnosis is determined by how the process of the central processing unit is defined. For example, the user can directly select a device for self-diagnosis and the self-diagnosis of the corresponding diagnosis target device by the central processing unit according to the user's selection. A process may be defined to perform a code reading operation, a process may be defined such that the central processing unit performs a self-diagnostic code reading operation for all the diagnosis target devices at regular intervals, and the user selects a plurality of diagnosis target devices. For the selected device, a process of the central processing unit may be defined to perform a read operation on the self-diagnosis code at regular intervals. However, the reading process for the self-diagnosis code is only one embodiment, and it will be apparent that various applications and modifications are possible by those skilled in the art. When the central processing unit reads the self-diagnosis code from a predetermined electronic control unit (ECU) through the same process as above, it outputs the read code to the terminal through the input / output unit (I / O unit). The self-diagnosis code is output by the terminal in a form that can be recognized by the driver (graphic interface, voice alarm or alarm flashing, etc.).

On the other hand, the self-diagnosis method according to the embodiment of the present invention disclosed above is for the case of outputting the self-diagnosis code itself read by the electronic control unit (ECU) through the terminal. In some cases, however, the central processing unit compares the diagnostic code read out from the predetermined electronic control unit (ECU) with the fault diagnosis code list previously stored in the inactive memory; If the read out diagnostic code is identical to a predetermined fault diagnosis code, the central processing unit reads out the action information according to the fault diagnosis by referring to the action information storage unit for each fault diagnosis code previously stored in the inactive memory. Wow; The central processing unit outputs the action information according to the failure diagnosis to the terminal through the input / output unit (I / O unit) in a form that can be recognized by the driver (graphical interface), thereby allowing the driver to easily diagnose the diagnosis information. You might be able to figure it out. In this case, the driver can easily know the type of fault and how to deal with it without having to look up the fault code book.

On the other hand, the vehicle self-diagnosis apparatus according to the present invention is the vehicle speed data sensed from a sensor mounted on a predetermined device in the vehicle and directly input to the input / output unit (I / O unit) via a connector; The sensor data values related to the coolant temperature, the mission oil temperature, etc. output from the predetermined electronic control unit (ECU) may be processed and output to the display unit of the terminal. In this case, the central processing unit uses the speed data and the sensor data value to input / output the input / output unit (I / O unit) information on the replacement point of the consumable according to the driving distance, whether the coolant temperature is abnormal or whether the mission oil temperature is abnormal. It would be more desirable to inform the driver of the terminal using a graphic interface (the replacement point information) or an alarm or alarm lamp (coolant temperature or mission oil temperature).

In addition, the vehicle self-diagnosis apparatus according to the present invention may digitize an analog voltage of a car battery, which is geodged from a car battery and directly inputs an input / output unit (I / O unit) through a connector, and outputs it to the display unit of the terminal. In this case, the central processing unit sends an analog battery voltage signal directly inputted to an input / output unit (I / O unit) to an A / D converter to convert the digital signal into a digital signal, and then receives the data previously inputted into an inactive memory (battery voltage According to the battery status information, for example, low voltage; medium voltage; high voltage, etc.) the terminal via the input / output unit (I / O unit) in a form that the driver can easily grasp the voltage state information (for example, low voltage alarm in the case of low voltage). It would be further desirable to make it possible to prevent the battery from being discharged while the driver is in trouble while driving the vehicle.

In the above, a preferred embodiment of the present invention has been disclosed. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims.

According to an aspect of the present invention, the vehicle self-diagnosis apparatus performs an initialization process of scanning and confirming a communication protocol of an electronic control unit (ECU) to transfer communication protocol type information for each electronic control unit (ECU) to an inactive memory. After storing it sequentially, it communicates with each electronic control unit (ECU) based on this and performs the self-diagnosis function of the vehicle. Therefore, the self-diagnosis apparatus for a vehicle according to the present invention can implement a self-diagnosis function regardless of the type of a vehicle without a separate apparatus operation.

According to another aspect of the present invention, the driver can be provided with the self-diagnosis code output by the electronic control unit (ECU) anytime, anywhere through the terminal mounted in the vehicle even without a separate device or operation. Accordingly, the driver can quickly and accurately grasp the failure of the vehicle even while driving the vehicle, thereby taking preliminary measures accordingly.

Claims (8)

A plurality of electronic control units (ECUs) mounted on a vehicle are connected to a connected connector to scan a communication protocol of an electronic control unit (ECU) regardless of the type of vehicle, and then use the identified communication protocol to In the vehicle self-diagnosis apparatus for outputting the self-diagnosis code in a form that can be recognized by the driver through a predetermined terminal, (a) an input / output unit (I / O unit) for forming an interface for code input and output with a terminal having a connector coupled with a plurality of electronic control units (ECUs) mounted on an automobile, and a graphic interface output means; And (b) in communication with each unit (ECU) by scanning each electronic control unit (ECU) connected to the connector through the input / output unit (I / O) in an initialization mode that proceeds after power is first applied; A first process of generating type information of the protocol and sequentially storing the information in the inactive memory; In the normal use mode after the initialization mode, the communication code of the diagnostic target device is transmitted from the electronic control unit (ECU) by communicating with each electronic control unit (ECU) using the communication protocol information stored in the inactive memory. Second process; And a central processing unit configured to perform a third process for outputting a diagnostic code transmitted from the second process to a terminal having a display means through the input / output unit (I / O unit) through a graphic interface. Automotive self-diagnosis device. The method of claim 1, An inert memory including a communication protocol scanner program capable of scanning an electronic control unit (ECU) in the initial mode of the first process to read communication protocol information for each unit (ECU), and the central processing unit is configured to read the communication protocol scanner program. And a memory unit configured to include an active memory for temporarily storing work data generated in the course of the first to third processes. The method of claim 1, A / D conversion unit for receiving the analog signal input to the input / output unit (I / O unit) through the connector to digital signal, further comprising: When an analog voltage signal of a battery is input through the connector, the A / D converter digitalizes the analog voltage signal, and the central processing unit outputs the digitalized battery voltage information to the graphic interface through the terminal. Self-diagnostic apparatus for cars. The method of claim 1, The terminal includes a liquid crystal display that displays a graphic interface to visually check the self-diagnosis code output through the input / output unit (I / O unit) under the control of the central processing unit; An alarm light for visually notifying the diagnosis state or an alarm for visually notifying the diagnosis state when the diagnosis code indicates a dangerous state of the device to be diagnosed as a result of the central processing unit determined according to a predetermined criterion; And a keypad unit capable of transmitting a predetermined command code to the central processing unit. A terminal for outputting the self-diagnosis codes output from the n electronic control units (ECUs) mounted in the vehicle in a form that can be recognized by the driver; An input / output unit (I / O unit) for forming a signal transmission interface with a connector to which the units (ECUs) are connected and the terminal; And automatically collect the respective communication protocol information by scanning the units (ECUs), and then read a self-diagnosis code from each unit (ECU) based on the unit information, and output the self-diagnostic code through the terminal. In the diagnostic method using a vehicle self-diagnosis apparatus comprising a central processing unit for controlling the system process so that, (a) When communication protocol scanning events for n electronic control units (ECUs) occur, the central processing unit attempts communication in a predetermined order using m communication protocols for each of the n units (ECUs). The communication protocol with the response from the unit ECU is determined to be the communication protocol of the scanning unit ECU, and the identification of the scanned unit and the communication protocol type information are matched to the inactive memory. Storing sequentially; (b) The central processing unit communicates with each other through a predetermined unit (ECU) and input / output unit (I / O unit) requiring self-diagnosis by referring to communication protocol matching information for each unit (ECU) stored in the inactive memory. Reading a self-diagnosis code from a unit ECU; And (c) when the central processing unit outputs the read self-diagnosis code to the terminal through an input / output unit (I / O unit), the self-diagnosis code is output by the terminal in a form that can be recognized by the driver. Auto diagnosis method characterized in that. The method of claim 5, wherein step (c) Comparing, by the central processing unit, the diagnostic code read out from the predetermined unit (ECU) with the fault diagnosis code list previously stored in the inactive memory; If the read out diagnostic code is identical to a predetermined fault diagnosis code, the central processing unit reads out the action information according to the fault diagnosis by referring to the action information storage unit for each fault diagnosis code previously stored in the inactive memory. ; And And a central processing unit outputting the action information according to the failure diagnosis to the terminal through an input / output unit (I / O unit) in a form recognizable by the driver. The method of claim 5, wherein step (a) comprises: For each of the n electronic control units (ECU), the process of confirming the communication protocol of the corresponding unit (ECU) in a predetermined order for the m communication protocols is completed. Communication is attempted sequentially from the first address to the last address used by the applicable communication protocol (kth: 1≤k≤m) until there is a response from the unit (ECU, pth: 1≤p≤n), and scanning If there is a response from the attempted unit (ECU: pth), the corresponding address is determined as the unit (ECU: pth) address, and the scanned address is matched with the type information of the applied communication protocol (kth) and stored in the inactive memory. And then terminating the communication protocol verification process of the scanned unit (ECU). The method of claim 7, wherein The order of application of the m communication protocols applied in the communication protocol verification process for each of the n electronic control units (ECUs) is determined according to the statistically popular order for the corresponding units (ECUs). Device.