KR200178225Y1 - System for car self diagnosis - Google Patents

Abstract

The present invention discloses a diagnostic system for an automotive electronic control system. The vehicle diagnostic system 1000 according to the present invention reads a plurality of actuators 130 to be controlled, a plurality of sensors 110 for detecting a state of a vehicle, and measured values of the sensors 110. In order to diagnose a failure of the vehicle 100 equipped with an electronic control unit (ECU) 120 which controls the actuator 130 and performs a self-diagnosis, the air in the cylinder during the intake cycle of air Intake manifold absolute pressure (MAP) sensor 210 for measuring the vacuum pressure, the output value and the control value of the plurality of sensors 110 through the electronic control device 120, the intake manifold vacuum pressure The output of the sensor 210 is a scanner 200 for directly scanning and storing the intake manifold vacuum pressure sensor 210, a client computer 400 receiving the scan data, all the sensors 110 for each vehicle type Standard The scan data is read from the client computer 400 through a database 600 and a network (for example, the Internet) storing output data values, maintenance instructions, and diagnostic protocols for each vehicle type, and a failure is detected by a diagnostic algorithm. And a server computer 500 for diagnosing and delivering the diagnosis result to the client computer 400.

According to the present invention described above, the conventional scanner can raise the role of the fault diagnosis contribution of only about 30% to about 60%, thereby maximizing the area of the scanner.

Description

System for car self diagnosis}

The present invention relates to a system for diagnosing a car using a cascade and a manifold absolute pressure (MAP) sensor. In particular, the present invention relates to a system for diagnosing a vehicle through the Internet.

In general, today's automobiles employ an Electronic Control System in each part. That is, an engine control system (ECS) to control the engine, a transmission control system (TCS) to control the automatic transmission, and an anti-skid brake system (ABS) to control the brake system. ) And automatic suspension systems (ASS), which are increasingly used in electronic control systems.

The configuration of such an electronic control system is generally as shown in FIG. The electronic control system receives data according to various situations from various sensors 10, and based on this, the electronic control device 20 operates according to an internal program, and then generates control data to control actuators as output parts. It is. The electronic control device 20 is a microprocessor.

An example of an engine control system is based on sensors that can read what the driver's will is, throttle position sensors (TPS) and air flow sensors (AFS) that measure the air intake. After calculating the air-fuel ratio, calculate the fuel amount by calculating the compensation value from the cooling water temperature sensor (WTS), air temperature sensor (ATS), air pressure sensor (BPS) Command a fuel injector on fuel.

The problem that arises as the introduction of advanced control systems continues to improve the performance of automobiles is trouble shooting. In addition to the control program, self-diagnosis programs have been added to assist in troubleshooting the control system.

The electronic control device 20 configured as a microprocessor continues the self-diagnosis while performing the control, and if a failure part is found during the control, the electronic control device 20 stores the code number of the failed part in a specific memory address. When an engine failure condition is displayed, the scanner 40 is connected to the self-diagnosis terminal of the vehicle and a diagnosis command is issued. The microprocessor transmits the failure code stored in the memory to the scanner 40. The scanner (40) receives this fault code value and converts it into a textual fault part name for display by the mechanic. This method for fault diagnosis of complex vehicle systems has contributed a lot to fault diagnosis.

Thanks to the fact that the diagnosis by the fault code of the electronic control device 20 contributes a lot, it has begun to add the sensor input value and the control output value to the self-diagnosis. It is designed to transmit up to. That is, the values of various sensors and various control values by calculation are output by the command of the scanner 40. These values are very useful data for judging the situation of the system. If used properly, they can contribute to the diagnosis of the technical situation and failure of each vehicle.

However, understanding the meaning of these data is a very difficult technology, and these data are not helpful for diagnosing actual failures. As a result, the fault diagnosis utilized in the maintenance field is only used for the diagnosis result by the fault code stored and transmitted by the electronic control apparatus 20, but the diagnosis by the sensor data or the control data is not performed at all. It is not used at all. In other words, the conventional scanner 40 merely displays various values transmitted by the electronic control apparatus 20.

On the other hand, even if the scanner 40 diagnoses that the specific sensor 10 is broken, there are many cases in which the specific sensor 10 is not broken in an actual situation. This means that accurate troubleshooting was difficult with the conventional method described above. Therefore, the diagnosis checks were made well by a considerable number of skilled workers in the designated maintenance shops of auto companies.However, the lack of skilled workers and the lack of data on the diagnosis made it difficult to make accurate diagnosis. .

The conventional scanner 40 performs a function of greatly defining and displaying a fault code, a function of scanning data, and a function of forcibly driving and checking the actuator 30. Among them, the fault code diagnosis function can transmit data by simplifying the output code. However, what can be represented by the fault code is only about 30% of the total fault as mentioned above.

In order to solve the above problems of the prior art, the present invention provides a system capable of accurately diagnosing a failure of a vehicle by using data received through an electronic control device and measurement data of a map sensor added in the present invention. The purpose.

1 is a configuration example of a conventional vehicle diagnostic system.

2 is a preferred embodiment of a vehicle diagnostic system according to the present invention.

3 is a view illustrating a scanner and a MAP sensor mounted on the docking station of FIG. 2;

<Brief Description of Major Parts of Drawings>

100: vehicle 110: sensor

120: ECU 130: actuator

200: scanner 210: MAP sensor

300: docking station 400: client computer

500: server computer 600: database

1000: car diagnostic system

The configuration of the vehicle diagnostic system 1000 according to the present invention is the same as that shown in FIG. 2, and FIG. 3 shows an exemplary diagram in which a scanner and a MAP are mounted on a docking station.

The vehicle diagnostic system 1000 according to the present invention reads a plurality of actuators 130 to be controlled, a plurality of sensors 110 for detecting a state of a vehicle, and measured values of the sensors 110. In order to diagnose a failure of the vehicle 100 equipped with an electronic control unit (ECU) 120 which controls the actuator 130 and performs a self-diagnosis, the air in the cylinder during the intake cycle of air Intake manifold absolute pressure (MAP) sensor 210 for measuring the vacuum pressure, the output value and the control value of the plurality of sensors 110 through the electronic control device 120, the intake manifold vacuum pressure The output of the sensor 210 is a scanner 200 for directly scanning and storing the intake manifold vacuum pressure sensor 210, a client computer 400 receiving the scan data, all the sensors 110 for each vehicle type Standard The scan data is read from the client computer 400 through a database 600 and a network (for example, the Internet) storing output data values, maintenance instructions, and diagnostic protocols for each vehicle type, and a failure is detected by a diagnostic algorithm. And a server computer 500 for diagnosing and delivering the diagnosis result to the client computer 400.

In the system 1000, the scanner 200 preferably includes a means for detecting a poor contact due to a fine short circuit of the conductive wire.

The electronic control device 120 includes an engine control system, a transmission control system, an anti-skid brake system for controlling braking, and an automatic suspension system.

The scanner 200 preferably has a means for forcibly driving the actuator 130 to check whether there is a failure.

The scanner 200 preferably includes means for performing a volt meter function, an ohm meter function and a tachometer function.

The docking station 300 may further include a docking station 300 for mounting the scanner 200 to upload the scan data to the client computer 400.

In this case, the docking station 300 preferably communicates with the client computer 400 using a card that can interface with RS232, USB, or other PC.

When the user inputs a failure symptom of the vehicle 100 through the client computer 400 at the time of a medical check, when the server 500 provides the client computer 400 with a standardized and detailed failure symptom, the user may enter the client computer 400. It is preferable to select and input a failure symptom closest to the symptoms of the vehicle 100 through.

The diagnosis result provided by the server 500 to the client computer 400 includes a definition of a fault code, a diagnosis content, maintenance instructions related to the diagnosis content, and scan data in hexadecimal. Preferably, a conversion table for expressing in a natural language is included.

The docking station 300 and the client computer 400 transmit and receive data by wire or wireless means. As an example, it is preferable to use a photodiode, a phototransistor or an antenna as the radio means.

Docking station 300 preferably further comprises means for charging the scanner 200.

Referring to the operation of the vehicle diagnostic system according to the present invention in more detail as follows. First, the scanner 200 is connected to the diagnostic terminal of the electronic control device 120, the intake manifold vacuum pressure sensor 210 is connected to the scanner 200 and the intake pipe, and the data is scanned through the scanner 200. Save it. After mounting the scanner 200 to the docking station 300, the docking station 300 is connected to the client computer 400, and then the scanned data through the docking station 300 to the client computer Upload to (400).

When the client computer 400 transmits the scanned data to the server computer 500 through a network, a diagnosis algorithm of a car is diagnosed using a diagnostic algorithm based on the scan data received by the server 500. The diagnosis result is transmitted to the client computer 400.

In particular, the system of the present invention, when the server 500 asks the client 400 a plurality of standard failure symptoms through the questionnaire process that the client 400 selects and answers the failure symptoms that are closest to the current vehicle failure among them. The standard output data of each sensor 110 corresponding to the type of the car is read from the database 600, and the selected items of the selected failure are sequentially selected. After determining whether there is an abnormality in the selected item from the scan data by the plurality of sensors 110, if there is an abnormality in the determination result, the first diagnosis is performed. If there is no next item, the scan data by the intake manifold vacuum pressure sensor 210 is analyzed, and the analysis result of the scan data by the intake manifold vacuum pressure sensor 210 and the corresponding standard value are obtained from the database 600. Read, compare, and make a second diagnosis. Finally, the closest one of the plurality of first diagnosis contents closest to the second diagnosis contents is determined as the final diagnosis contents.

Looking at the process of diagnosing the failure of idle idling using the system of the present invention is as follows. First of all, after confirming that the expected failure is a failure that causes idle idling, the main items to be checked in this condition are rpm, I / S (id switch) and injection status. Then read the standard values for them from the database.

And since the sensors received the readings as scan data, the server first checks whether rpm is normal, if not normal, makes a diagnosis of 'adjust idling' first, and then whether I / S is on. Check As a result, if I / S is off, it is diagnosed as 'throttle adjustment' or 'I / S bad'. Finally, check the injection status. As a result, if the injection occurs evenly, it is diagnosed as 'ignition system failure', 'fuel system failure', 'short-circuit instantaneous' or 'poor contact instantaneous'.

However, the first diagnosis result does not know exactly what is causing the failure. Finally, the value of the MAP sensor is analyzed. The reason is that the MAP sensor value is the value that best represents the overall symptom of the car. Thus, if only this value can be read correctly, it is possible to diagnose the fault condition of the vehicle relatively accurately without other measuring devices. From this point of view, the trend of the MAP sensor value over time is examined. In general, there are three major trends. That is, breathe synchronously, asynchronously, or evenly.

In case of synchronous breathing, it is diagnosed as 'ignition high pressure system defect', in case of asynchronous breathing, it is diagnosed as 'air leakage', and in case of breathing evenly, 'idle adjustment' is needed.

As described above, some faults can be accurately diagnosed using only the sensor value and control value, and there may be various causes of symptoms having the same sensor value and control value. Even failure can not play a role as a diagnostic without accurate diagnosis. In other words, in the above example, the general sensor value alone cannot accurately determine the cause of the failure. That is, since the sensor value and the control value are the same, for accurate fault diagnosis, the physical cause of the MAP sensor value is correctly distinguished to accurately diagnose the cause of the fault.

Although the present invention has only described one fault diagnosis example in which idle idling occurs, it is obvious to those skilled in the art that the fault can be diagnosed through a similar process as described above for other faults. to be.

In the present invention, when the data is scanned with the scanner 200, the vacuum pressure in the cylinder is measured at the same time to utilize the value in the diagnosis to make an accurate diagnosis. At this time, the vacuum pressure detected from the intake manifold vacuum pressure sensor 210 is synchronized with the values of the electronic control device 120.

On the other hand, in the present invention, various types of standardized failures used in paperweights are classified into various types and built in the database 600. For example, engine-related failure items are classified into failures at idle, failures at run, failures at start, and the like, and failures at idle are further subdivided into reliefs during cooling, reliefs at high temperatures, and the like.

And an example of the conversion table of the diagnostic code mentioned above is shown in Table 1. The diagnostic code is different for each vehicle type. For example, the diagnostic code can be shown in Table 1. However, because the hexadecimal value means that the general mechanic can not recognize it, it should be changed to a text that is easily understood by humans such as 'air flow' failure, that is, natural language.

Diagnostic code Breakdown Content 14 air flow sensor failure

In addition, the system of the present invention provides the client with the contents of the maintenance instructions for the maintenance according to the contents of the diagnosis. The reason is that it is very difficult for a general workshop to have all the extensive manuals for all vehicles. However, according to the implementation of the present invention, it is very convenient because the detailed maintenance instructions for the failure can be easily obtained through the Internet.

Meanwhile, as shown in Table 2 below, the values sensed by the sensors 110 and the control values may represent the same values for various failures. In this case, the existing technology could not accurately diagnose the failure. However, in the present invention, as shown in Table 2, by substituting the value of the map sensor 210, the type of failure can be accurately distinguished.

Sensor value Control value Map sensor value Fault type ... ... ... ...

According to the present invention diagnosis system 1000 and the diagnosis method, the data diagnosis function can be improved to diagnose about 60% of all failures generated in the vehicle. In other words, the present invention provides a high-level diagnosis system for diagnosing a fault by detecting a state by receiving sensor values and control values transmitted from the self-diagnosis, and furthermore, by dividing the detailed fault by using a map (maniP absolute) sensor data. The failure diagnosis rate can be greatly improved. As a result, the weak contribution (about 30%) contributed by the scanner 200 depending on the conventional fault code can be increased more than twice as much as the intelligent diagnosis according to the present invention.

The present invention described above may be variously modified and may take various forms, and only the specific embodiments thereof are described in the detailed description of the present invention. It is to be understood, however, that the present invention is not limited to the particular form referred to in the detailed description of the invention, but rather includes all modifications, equivalents, and substitutes within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

According to the present invention described above it is possible to accurately diagnose about 60% of the total failure occurring in the vehicle. Therefore, it is possible to achieve almost twice the improvement of the diagnostic performance compared to the conventional, it is possible to improve the overall maintenance ability of the automobile maintenance industry, thereby having the advantage that can be relatively reduced car accidents due to poor maintenance. The maintenance technology level between the automaker's direct maintenance factory and the general car center is equalized, while the general car center is idle while the direct maintenance factory can solve the inconvenience of having to schedule maintenance a few days in advance to achieve consumer satisfaction. In addition, by establishing a database 600 for parts in connection with the server 500, it is possible to operate transparently from maintenance instructions to management and ordering of parts, part numbers, parts prices, etc., thereby increasing customer satisfaction. It is expected.

Claims (12)

A plurality of actuators to be controlled, a plurality of sensors for detecting a state of a vehicle, and an electronic control unit (ECU) for reading the measured values of each sensor and performing self-diagnosis while controlling the actuators In a car diagnostic system for diagnosing a failure of a vehicle, An intake manifold absolute pressure (MAP) sensor for measuring the vacuum pressure in the cylinder during the intake cycle of air; A scanner configured to scan and store output values of the plurality of sensors and control values through the electronic control device, and directly output the intake manifold vacuum pressure sensor from the intake manifold vacuum pressure sensor; A client computer receiving the scan data; A database storing standard output data values, maintenance instructions, and diagnostic protocols of each vehicle for each vehicle; And And a server computer that reads the scan data from the client computer through a network, diagnoses a failure by a diagnostic algorithm, and delivers the diagnostic result to the client computer. 2. The vehicle diagnostic system of claim 1, wherein the scanner comprises means for detecting a poor contact due to a fine short circuit of the conductive lead. 3. The vehicle diagnostic system according to claim 1 or 2, wherein the electronic control device includes an engine control system, a transmission control system, an anti-skid brake system for controlling braking and an automatic suspension system. 4. The vehicle diagnostic system according to claim 3, wherein the scanner has means for forcibly driving the actuator to check for failure if necessary. 5. The vehicle diagnostic system of claim 4, wherein the scanner includes means for performing a volt meter function, an ohm meter function, and a tachometer function. 2. The vehicle diagnostic system of claim 1, further comprising a docking station for mounting the scanner to upload the scan data to the client computer. 7. The vehicle diagnostic system of claim 6, wherein the docking station communicates with the client computer using a card that can interface with a RS232, USB, or other PC. 2. The method of claim 1, wherein when the vehicle enters a fault condition of the vehicle through the client computer at the time of a paperweight, if the server provides a standardized and granular fault condition to the client computer, the user has a fault closest to that of the vehicle through the client computer. The vehicle diagnostic system characterized by selecting and entering the symptoms. The diagnostic result of claim 1, wherein the diagnostic information provided by the server to the client computer includes a definition of a fault code, a diagnosis content, maintenance instructions related to the diagnosis content, and scan data in hexadecimal. And a conversion table for expressing in a natural language. 7. The vehicle diagnostic system according to claim 6, wherein the docking station and the client computer transmit and receive data by wire or wireless means. The vehicle diagnostic system according to claim 10, wherein the radio means is an optical element or an antenna. 7. The vehicle diagnostic system of claim 6, wherein the docking station further comprises means for charging the scanner.