KR20140037348A - Vehicle analysis apparatus using earth level signal - Google Patents

Abstract

The present invention relates to a method and an apparatus for inspecting and analyzing the state of a vehicle using a grounding level signal of a vehicle, which can inspect and analyze the state of a grounding line of a vehicle using the cycle and shape of the output signal wave form of a grounding level sensor capable of measuring the grounding level of the vehicle, and then can diagnose the charging state of a battery and the failure of the grounding line. The advantage of the present invention is to be able to analyze various states of a vehicle in order to diagnose failure only by analyzing and comparing a grounding sensor signal of the vehicle and a voltage signal of a battery with an engine RPM or an injector ignition signal. Another advantage of the present invention is to be able to perform effective state diagnosis and failure checks using the characteristics of the grounding sensor signal and the voltage signal of the battery according to the basic operational principles and characteristics of the engine of a vehicle for engines of various vehicle types having different conditions without the need to form additional characteristic database by vehicle types. [Reference numerals] (AA) No: Normal power supply state because of a low grounding level; (BB) Yes: Serious grounding noise; (CC) No: Unrelated with engine RPM; (DD) Yes: In proportion to engine RPM; (EE) Diagnosable through generator voltage; (FF) No: Only noise in proportion to engine RPM exists; (GG) Yes: Other noise exists besides the noise in proportion to engine RPM; (H1,Q1,R1,S1,T1) Detail description; (H2,Q2,R2,S2,T2) Failure cases; (H3,Q3,R3,S3,T3) Repair description; (II) No: No change; (JJ) Yes: Noise increases during acceleration; (KK) No: No voltage drop; (LL) Yes: Serious voltage drop during startup; (MM) Firstly check the injector wiring; (NN) Firstly check the ignition system; (OO) Firstly check the engine and the car body grounding; (PP) Firstly check the battery/generator; (S1) Simultaneously receive (measure) the battery voltage/TPS grounding voltage; (S10a) Normal; (S10b,S10c,S10d,S10e) Suggest a check direction; (S1a) Convert the battery voltage/signal grounding filtering; (S2) Measure the grounding voltage level; (S3) Is the grounding voltage level high?; (S4) In proportion to engine RPM?; (S5) Does noise out of proportion to engine RPM exist?; (S6) Order deceleration; (S7) Does noise change?; (S8) Order to restart the engine by N times; (S9) Is a voltage decrease serious?

Description

Vehicle condition inspection analysis method and device using vehicle ground level signal {Vehicle Analysis Apparatus Using Earth Level Signal}

The present invention relates to a vehicle condition inspection analysis method and apparatus using a ground level signal of a vehicle. The present invention relates to a vehicle ground line state by using a period and a shape of an output signal waveform of a ground level sensor capable of measuring a ground level of a vehicle. The present invention relates to a vehicle condition inspection analysis method and apparatus using a ground level signal of a vehicle capable of diagnosing a state of charge of a battery and a failure of a ground line.

Generally, electrical components such as electronic equipment for engine management system (EMS) of a vehicle have an electronic control unit (ECU) such as the ground (GND) line of the component circuit thereof is shown in FIG. 9. It is connected to the terminal and the wiring shown for the maintenance of the internal ground circuit of the electronic control control unit is connected to the mechanical element of the chassis or the mechanical element of the engine through a separate wiring. In addition, the mechanical element of the chassis or the mechanical element of the engine is connected to the battery negative terminal by a separate thick wire.

In this state, the potential between the battery ground (-) terminal and the drive system ground (GND) line has a slight potential difference depending on the power wiring connection state of the electrically operated drive system or the battery charging state of the vehicle. Occurs.

The potential difference between the ground (GND) line of the electric drive system and the negative terminal of the battery may be measured by various kinds of ground level sensors, and according to the ground level value according to the output signal of the ground level sensor, As such, it is possible to roughly distinguish the state of the vehicle.

When the ground level value according to the output signal of the ground level sensor is 0V and there is no noise at all, it can be regarded as a normal state.

When the ground level value according to the output signal of the ground level sensor is 0-50mV, the ground level value may be slightly but it may be expected that there is no problem in operation.

When the ground level value according to the output signal of the ground level sensor is 51-100 mV, it may be expected that side effects (sensor signal abnormality) of some control systems may occur because the ground level value is slightly higher.

When the ground level value according to the output signal of the ground level sensor is 101-500mV, it can be expected that a lot of side effects of the control system side effects (sensor signal abnormality / processor bug, etc.) due to the high point level value.

When the ground level value according to the output signal of the ground level sensor is 500 mV or more, the ground level value is very high, which may cause most control system side effects (sensor signal abnormality / processor bug) as well as damage to the internal hardware of the unit.

On the other hand, the ground level value according to the output signal of the ground level sensor is not only a numerical value, but a value that changes with time, and has a feature of the shape of a signal waveform. The signal waveforms with the corresponding ground level values can be used to more accurately examine and analyze the condition of each part of the vehicle.

However, conventionally, only devices that determine the normal / abnormal state of the ground state of the vehicle using only the magnitude of the ground level value according to the output signal of the ground level sensor exist, and even the waveform characteristics of the output signal of the ground level sensor. There was a problem that it is impossible to examine and analyze the condition of each part of the vehicle more accurately by analyzing.

The present invention solves the above problems of the present invention, and diagnoses a failure by analyzing various states of the vehicle only by analyzing the ground sensor signal of the vehicle and the voltage signal of the battery in comparison with the engine speed or the injector ignition signal. An object of the present invention is to provide a vehicle condition inspection analysis method and apparatus using a ground level signal of a vehicle.

In addition, the ground sensor signal and battery voltage according to the basic operating principle and characteristics of the vehicle engine, without having to configure a characteristic database for each vehicle type, even for engines of various vehicles having different conditions such as the displacement amount and the number of cylinders. An object of the present invention is to provide a method and apparatus for analyzing vehicle condition inspection using a ground level signal of a vehicle to enable efficient condition diagnosis and fault check using characteristics of a signal.

Vehicle condition inspection analysis method using the ground level signal of the vehicle of the present invention to achieve the above object,

A sensor signal input step S1 for receiving an output signal s of the ground level sensor, an engine speed signal r, and a voltage signal V of the battery;

A ground voltage level measuring step (S2) of detecting and measuring a ground voltage level (e) of the output signal (s) of the ground level sensor;

A ground voltage determination step (S3) of comparing the ground voltage level (e) measured in the ground voltage level measurement step (S2) with a reference ground voltage (E);

When the ground voltage level (e) exceeds the reference ground voltage (E) range in the ground voltage determination step (S3), the signal waveform of the ground voltage level (e) is applied to the engine speed signal (r). A rotation proportion determination step (S4) of determining whether or not it occurs in proportion;

When the signal waveform of the ground voltage level (e) is determined to occur in proportion to the engine speed signal r in the rotation proportion determination step (S4), the signal waveform of the ground voltage level (e) of the A noise determining step (S5) of determining whether a portion not proportional to the engine speed signal r also occurs;

When it is determined that the signal waveform of the ground voltage level e is generated only in proportion to the engine speed signal r through the rotation proportion determining step S4 and the noise determining step S5, An acceleration / deceleration step S6 for instructing acceleration / deceleration;

A noise change determination step (S7) of judging whether the noise of the signal waveform of the ground voltage level (e) changes during the acceleration / deceleration step (S6);

It is determined that the signal waveform of the ground voltage level e is not proportional to the engine speed signal r in the rotation proportion determination step S4, or the ground voltage level e in the noise determination step S5. An engine restart instruction step (S8) of instructing the engine restart one or more times when it is determined that a portion of the signal waveform of i) is not proportional to the engine speed signal r;

In the engine restart instruction step (S8), the voltage drop and noise increase determination step (S9) of comparing the decrease level of the voltage signal (V) of the battery with a reference drop voltage (V0) and determining whether the initial ground level is increased. ; And a control unit.

In addition, when the ground voltage level (e) is less than the reference ground voltage (E) range in the ground voltage determination step (S3), the normal determination step (S10a);

An injector failure determination step (S10b) of determining injector-related failures when the noise of the signal waveform of the ground voltage level (e) does not change in the noise change determination step (S7);

An ignition system failure determination step (S10c) of determining an ignition system failure when noise of the signal waveform of the ground voltage level (e) increases during acceleration in the noise change determination step (S7);

A ground fault determination step (S10d) of determining that the ground fault of the engine and the vehicle body is poor when the degree of degradation of the voltage signal V of the battery is less than a reference drop voltage V0 in the voltage drop and noise increase determination step (S9);

In the voltage drop and noise increase determination step (S9), when the engine is started, the voltage signal V of the battery is lower than the reference voltage V0 and the ground voltage level e is increased. Determination step of determining the power supply failure of the power supply (S10e); And further comprising:

In addition, the sensor signal input step (S1),

And filtering to remove noise of the output signal s of the ground level sensor (S1a),

Contents description steps S11a to S11e for displaying the details of the failures, similar failure cases, and necessary repair measures after the normal determination step (S10a) to the power supply failure determination step (S10e), respectively;

A database storage step of storing a test analysis result for each vehicle inspected for each of the normal determination step (S10a) to the power supply failure determination step (S10e) and storing the database including the history of each vehicle; And further comprising:

On the other hand, the vehicle condition inspection analysis apparatus using the ground level signal of the vehicle according to an embodiment of the present invention, is connected to the sensor signal output unit 20 including the OBD-2 connector 10 of the vehicle is the sensor signal input A sensor input / output connection unit 110 for receiving an output signal s of the ground level sensor, an engine speed signal r, and a battery voltage signal V required in step S1;

A main control device (120) connected to the sensor input / output connection unit (110) to perform a vehicle condition inspection analysis method using the ground level signal of the vehicle according to any one of claims 1 to 3;

A display unit 130 connected to the main control device 120 to visually display a vehicle state inspection analysis process and results;

An operation input unit 140 connected to the main control unit 120 and receiving a user's operation input; And a control unit.

In addition, by using any one or more of the wireless communication module 150 or the Internet network 160 connected to the main control device 120 is connected to the main control device 120, using the ground level signal of the vehicle An external terminal device 170 capable of inquiring the execution result of the vehicle condition inspection analysis method; And further comprising:

According to the present invention, there is an advantage that the failure can be diagnosed by analyzing various states of the vehicle, by only analyzing the ground sensor signal of the vehicle and the voltage signal of the battery in comparison with the engine speed or the injector ignition signal. .

In addition, the ground sensor signal and battery voltage according to the basic operating principle and characteristics of the vehicle engine, without having to configure a characteristic database for each vehicle type, even for engines of various vehicles having different conditions such as the displacement amount and the number of cylinders. Using the characteristics of the signal has the advantage that it is possible to efficiently diagnose the condition and check the failure.

1 is a flowchart showing the flow of a vehicle condition inspection analysis method using a ground level signal of a vehicle according to an embodiment of the present invention.
2 is a view showing a ground level signal of a vehicle in a normal state in a vehicle state inspection analysis method using a ground level signal of a vehicle according to an embodiment of the present invention;
3 is a diagram illustrating a ground level signal of a vehicle in an injector-related failure state in a vehicle state inspection analysis method using a ground level signal of a vehicle according to an exemplary embodiment of the present invention.
4 is a view illustrating a ground level signal of a vehicle in a bad state related to an ignition system in a vehicle state inspection analysis method using a ground level signal of a vehicle according to an embodiment of the present invention;
5 is a diagram illustrating a ground level signal of a vehicle in a ground failure state of an engine and a vehicle body in a vehicle state inspection analysis method using a ground level signal of a vehicle according to an embodiment of the present invention;
6 is a view showing a ground level signal of a vehicle in a bad state of a power supply in a vehicle state inspection analysis method using a ground level signal of a vehicle according to an embodiment of the present invention;
7: Block diagram of the vehicle condition inspection analysis apparatus using the ground level signal of the vehicle according to an embodiment of the present invention.
8 is a schematic diagram illustrating a case where a voltage meter is used as a ground level sensor in a vehicle state inspection and analysis apparatus using a ground level signal of a vehicle according to an embodiment of the present invention.
9 is a schematic diagram showing a grounding configuration in a general vehicle.
10 is a schematic diagram showing an ignition waveform when the ground resistance is increased.

Hereinafter, with reference to the accompanying drawings, a vehicle condition inspection analysis method and apparatus using a ground level signal of a vehicle according to an embodiment of the present invention will be described in detail. First, it should be noted that, in the drawings, the same components or parts are denoted by the same reference numerals whenever possible. In describing the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

First, the vehicle condition inspection analysis method using the ground level signal of the vehicle according to an embodiment of the present invention will be described.

Vehicle condition inspection analysis method using the ground level signal of the vehicle of the present invention is largely as shown in Figure 1, the sensor signal input step (S1), ground voltage level measurement step (S2), ground voltage determination step (S3), Rotation proportion determination step S4, noise determination step S5, acceleration / deceleration step S6, noise change determination step S7, engine restart instruction step S8, voltage drop and noise increase determination step S9 and respectively It is configured to include the analysis of the step (S10).

First, the sensor signal input step S1 will be described. The sensor signal input step S1 may include a driving state of an angle drive system related to engine control including an output signal s of the ground level sensor, an engine speed signal r, and a voltage signal V of the battery. It is a step of receiving input of general information related to the operation state of the engine (this is referred to as service data in the technical field related thereto).

In this case, the ground level sensor may be implemented in a wide variety of embodiments. In general, as shown in FIG. 8, a ground level sensor may be used as an electronic device of a vehicle through a voltage measuring instrument (hereinafter, referred to by those skilled in the art as an oscilloscope). Measure the potential difference between the ground line (wire between the sensor or drive system ground and the control unit internal ground circuit) of the electrical components and the negative terminal of the battery. This potential difference is called the ground level, which is typical for evaluating the ground level of the potential difference between the ground line of the throttle position sensor and the negative terminal of the battery, which should normally detect the signal most sensitively in electronic control of the engine. Used as

On the other hand, the sensor signals are transmitted from the sensors mounted on the vehicle according to the characteristics of each sensor, via a controller area network (CAN) or K-Line, or data of the voltage measuring instrument according to the OBD-2 standard It is preferable to be transmitted through the communication line.

The OBD-2 (On-Board Diagnosis-2) is one of the regulations related to automobile emissions in the United States, which is applied similarly in Korea, and diagnoses emission control parts or systems while the vehicle is running by using a computer embedded in the vehicle. If a situation in which harmful emissions can come out above the standard appears, determine the abnormality of the parts or system related to it and save the trouble code (DTC) when it is determined to be a failure and use the Malfunction Indicator Light (MIL). It is a law that regulates to turn on and expresses the service data related to it.

Since the existing OBD systems that were applied for the first time only checked the short-circuit of electronic parts and wiring, it is not known that the exhaust gas increases due to deterioration of the catalyst or oxygen sensor, abnormal behavior of sensor or actuator, The connector, the failure code, the warning light, and the type of the stored information are not standardized. Therefore, different connectors are required for each vehicle or manufacturer, and various other data for interpreting the failure code are required. Respectively.

In order to solve this problem, use the terminology of general diagnostic equipment connection connector and communication specification electronic control parts, unit and display method of fault code and service data as standardized ones, and break down each item that will increase emissions when failure occurs. The OBD-2 Act is amended by adding criteria and diagnostic requirements.

OBD-1 is defined as OBD-1, which diagnoses only simple faults related to engine control with a computer built in the vehicle and OBD-1, The OBD-2 is defined as OBD-2. In this case, the OBD-2 is defined as OBD-2. In this case, 2 If the warning light is on If there is not a functional fault and the exhaust gas is too much, there is no problem in driving the vehicle even if it is not repaired. If the warning light is lit, And OBD-3 are defined as comprehensive technical contents for enforcing the improvement measures in case of excessive emission of exhaust gas, such as limiting the operation of the vehicle, etc.

Diagnosis items in accordance with OBD-2 regulations include catalysts, engine burns, fuel gauges, coolant coolant leaks, evaporative gas leaks, oxygen sensors, EGR, Thermostat, PCV (Positive Crankcase Ventilation) valves and other engine or transmission controls. It includes all sensors and solenoids used for diagnosis, and does not specify a specific name or range, but includes "all factors that can cause harmful emissions above the standard".

The transmission of data according to OBD-2 regulations is done via CAN or K-Line using ISO9141-2 or KWP2000's vehicle fault diagnosis standard protocol. The ISO 9141-2 and KWP 2000 are standard protocols for vehicle failure diagnosis specified by ISO (International Organization for Standardization) and SAE (Society of Automotive Engineers).

The CAN (Controller Area Network) is a network communication method that can be used in a small range, and is a vehicle network system for providing digital serial communication between various measurement control equipment of a vehicle by a next generation vehicle diagnostic communication method. The CAN replaces intelligent electrical wiring and relays of electronic components in vehicles with serial communication lines, thereby reducing weight and complexity, and transmitting data at a very high speed, thereby meeting various kinds of real-time demands in a vehicle. In addition, it can diagnose abnormality caused by electronic interference and communicate organically in case of accident during driving. As an ISO standard, it is applied to advanced automotive electronic systems and can integrate systems such as engine management, anti-lock braking systems (ABS), transmission management systems (TMS), air conditioning, door locks, and mirror adjustment. . The transmission speed of the CAN is 500Kbps ~ 1Mbps, which is more than 50 times faster than the existing communication speed. On the other hand, K-Line is a vehicle diagnostic communication line named by the OBD regulations and has a speed of 10.4 Kbps.

In the case of the present invention, receiving the service data from the vehicle control computer can determine that the signal of the ground level sensor is proportional to the number of revolutions of the engine. If the sampling rate is slow (less than 100 times per second but less than 100H) when receiving service data by a method other than CAN communication and recognizing a signal from a vehicle-mounted sensor from a computer in the vehicle. It is not easy to see that the period of change in the waveform of the ground level sensor signal is proportional to one cycle of the engine because the signal received much less sensitivity even though the service data was received through CAN communication. Therefore, in this case, it is preferable to further have a function of measuring the ground level sensor signal and the injector driving signal I or the ignition signal among the engine cylinders of the engine through the voltage meter.

On the other hand, the sensor signal input step (S1), as shown in Figure 1, when considering the sensitivity or resolution of the various types of ground level sensor, filtering to remove the noise of the output signal (s) of the ground level sensor It is preferable to further comprise a filtering step (S1a).

In this case, a wide variety of embodiments are possible to filter to remove noise of the output signal s of the ground level sensor.

In one embodiment, after discretizing the time axis of the output signal (s) of the ground level sensor for each time zone having a predetermined time width, it is possible to filter by a discrete equation as shown in Equation 1 below. Do.

In this case, s (n) is the actual value of the output signal s of the ground level sensor in the nth discrete section, and s (n-1) is the output of the ground level sensor in the n-1th discrete section. Is the actual value of the signal s. On the other hand, S (n) is the filtered correction value of the output signal s of the ground level sensor in the nth discrete section, and S (n-1) is the ground level sensor of the ground level sensor in the n-1th discrete section. The filtered correction value of the output signal s. K in Equation 1 is a correction coefficient or a filtering coefficient, and when the value is 1, the filtered correction value has the same value as the actual value of the output signal s of the ground level sensor. If the value is smaller than 1, the change in the actual measured value is mitigated to have a filtered value. Matters related to the sampling rate for accepting this data and the technique for discretizing and filtering the received signal are well known in the field of engine electronic control development to which the present invention pertains, and thus detailed descriptions thereof will be omitted.

Next, the ground voltage level measuring step S2 will be described. The ground voltage level measuring step S2 is a step of detecting and measuring the ground voltage level e of the output signal s of the ground level sensor as shown in FIG. 1. Since the technique of detecting and measuring the ground voltage level e of a signal that varies with time, such as the signal s, is a well-known technique in the art, the detailed description thereof will be omitted.

Next, the ground voltage determination step S3 will be described. As shown in FIG. 1, the ground voltage determining step S3 compares the ground voltage level e measured in the ground voltage level measuring step S2 with a reference ground voltage E. As shown in FIG. In this case, the reference ground voltage E is a value set arbitrarily to determine whether the ground voltage level e exceeds a predetermined reference value, and in general, the ground level value according to the output signal of the ground level sensor is 0. In case of 50mV, there may be some ground level value but there may be no problem in operation.In case that the ground level value according to the output signal of the ground level sensor is 51-100mV, the ground level value is slightly high. Considering the characteristics that can be expected to cause side effects (sensor signal abnormality) of some control systems, it is preferable to set the value around 50mV for sensitive analysis and the value around 100mV for insensitive analysis.

Next, the rotation proportion determination step S4 will be described. The rotation proportion determination step S4 is performed when the ground voltage level e exceeds the reference ground voltage E range in the ground voltage determination step S3, as shown in FIG. 1. It is a step of determining whether a signal waveform of level (e) occurs in proportion to the engine speed signal r. In this case, it means that the signal waveform of the ground voltage level e is proportional to the engine speed signal r. As shown in FIG. 3, the period t is the engine speed signal r. This means that the detection is performed in conjunction with the period of the injector driving signal I which is proportional to an integer multiple, or having an integer multiple.

On the other hand, the injector drive signal I has a property that it is proportional to an integer multiple of the engine speed signal r. That is, in the four-stroke engine, the injector of one cylinder is operated once during two rotations of the engine shaft, and the injector of one cylinder is operated once during one rotation of the engine shaft in the two-stroke engine. Accordingly, the injector drive signal I of any one cylinder occurs once during the occurrence of the engine revolution number signal r twice in the case of a four-stroke engine, and in the case of the two-stroke engine, (r) occurs one time.

Next, the noise determination step S5 will be described. In the noise determining step S5, as shown in FIG. 1, the signal waveform of the ground voltage level e is generated in proportion to the engine speed signal r in the rotation proportion determining step S4. If it is determined, it is a step of determining whether a portion of the signal waveform of the ground voltage level e that is not proportional to the engine speed signal r also occurs. Here, the meaning that there is also a portion of the signal waveform of the ground voltage level (e) that is not proportional to the engine speed signal r is constant in the engine speed signal r as shown in FIG. 4. The signal waveform of the ground voltage level (e) is present even in a portion that does not coincide with the period of the injector drive signal (I) which is proportionally doubled.

Next, the acceleration / deceleration step S6 will be described. As shown in FIG. 1, the acceleration / deceleration step S6 is performed through the rotation proportion determination step S4 and the noise determination step S5. The signal waveform of the ground voltage level e is the engine speed. If it is determined to occur only in proportion to the signal r, the step of instructing the acceleration and deceleration of the engine.

Next, the noise change determination step S7 will be described. As shown in FIG. 1, the noise change determining step S7 includes determining whether the noise of the signal waveform of the ground voltage level e changes as shown in FIG. 4 during the acceleration / deceleration step S6. to be.

In general, an engine with an ignition device may cause a large amount of electrical noise, which may cause side effects in the control system. Among the electrical devices, the most frequently occurring side effect is noise generation in the injector and the ignition system. Both have properties that are proportional to engine speed and integer multiples.

Therefore, when the noise is proportional to the engine speed, it is predicted as a state defect in the injector or the ignition system. Among them, the ignition system has the characteristic of increasing the electrical noise in the acceleration phase.

This is because the ignition spark of the ignition system is made from the spark plug. Since the tip part is separated by a certain gap (0.8-1.2 mm), the spark is generated when the high voltage flows. The electrical resistance at the moment of discharge when this spark is generated increases the pressure at the tip gap portion when the accelerator pedal is pressed, thereby increasing the electrical discharge resistance at the tip portion. Therefore, when the accelerator pedal is pressed, a large amount of fuel and air mixture flows into the combustion chamber, thereby increasing the pressure in the combustion chamber and increasing the resistance to ignition and discharge. On the other hand, when the discharge resistance is increased, as shown on the right side in Fig. 10, the discharge voltage generated at that time also increases significantly, and electrical noise increases.

On the other hand, in the case of the injector, when the accelerator pedal is pressed, noise is generated constantly regardless of acceleration and deceleration because there is almost no change in resistance or driving voltage in the electric drive system of the injector system. If the noise level increases during acceleration through the acceleration / deceleration step S6 by using the electrical characteristic, the injector failure is expected if the noise level does not change due to the ignition system failure.

Next, the engine restart instruction step S8 will be described. In the engine restart instruction step S8, as shown in FIG. 1, the signal waveform of the ground voltage level e is not proportional to the engine speed signal r in the rotation proportion determination step S4. If it is determined, or in the noise determination step (S5) it is also determined that the portion of the signal waveform of the ground voltage level (e) is not proportional to the engine speed signal r occurs, the engine restart is indicated one or more times It's a step.

Next, the voltage drop and noise increase determination step S9 will be described. In the voltage drop and noise increase determination step S9, as shown in FIG. 1, the degree of reduction of the voltage signal V of the battery is compared with a reference drop voltage V0 in the engine restart instruction step S8. It is the step of determining whether the initial ground level is increased. In this case, the reference drop voltage V0 serves as a criterion for determining the degree of fall or drop of the voltage signal V of the battery, and generally has a value that can be set according to temperature. Therefore, when the outside temperature is less than 0 ° C, the reference drop voltage V0 is preferably set to 5.7V, 6.5V for 0 ° C to 20 ° C, and 8V for 20 ° C or more.

However, when a large load is applied to engine rotation (starting in this technical field, cranking) at start-up due to a mechanical state of the starting system (starting motor, etc.), the voltage signal V of the battery may be greatly reduced. . Even when the mechanical load at the time of such cranking is large and a large voltage drop occurs, the noise level does not increase when the state of charge is good. Therefore, if the voltage drops a lot during cranking but the noise does not rise significantly, the battery's state of charge can be expected to be due to normal or mechanical conditions (such as gear tooth biting).

Therefore, when the voltage drop and noise increase determination step (S9) occur both of the battery voltage drop and the noise level increases, it is determined that the power supply system is defective. If not, it can be determined that the connection of the ground wire such as the engine and the vehicle body is poor.

The criterion for the significant increase in noise during cranking is more than three times the average value of the noise level that occurs after the engine has been started, most of which exceeded 200-300mV.

Next, each analysis determination step (S10) will be described.

First, the normal determination step S10a will be described. 1 and 2, when the ground voltage level e is less than or equal to the reference ground voltage E in the ground voltage determination step S3, the normal determination step S10a is determined to be normal. It's a step.

Next, the injector failure determination step (S10b), as shown in Figures 1 and 3, even when the noise of the signal waveform of the ground voltage level (e) in the noise change determination step (S7) is subjected to acceleration and deceleration If not, it is determined that the injector is bad.

Next, the ignition system failure determination step (S10c), as shown in Figures 1 and 4, when the noise of the signal waveform of the ground voltage level (e) in the noise change determination step (S7) increases during acceleration It is a step of judging that the ignition system is bad.

Next, as shown in FIG. 1 and FIG. 5, the ground failure determination step S10d may be performed by determining the degree of degradation of the voltage signal V of the battery in the voltage drop and noise increase determination step S9. If it is less than V0), or if the voltage drop of the battery is greater than or equal to the reference drop voltage V0 but the noise level does not rise during cranking, it is determined that the grounding of the engine and the vehicle body is poor.

Lastly, as illustrated in FIGS. 1 and 6, in the power supply failure determination step S10e, the degree of degradation of the voltage signal V of the battery when the engine starts in the voltage drop and noise increase determination step S9 is increased. If the ground voltage level e is higher than the reference drop voltage V0, the generator or battery is determined to be defective.

On the other hand, after the normal determination step (S10a) to the power supply failure determination step (S10e), respectively, as shown in Figure 1, in response to the failure status, respectively, to display the failure details, similar failure cases and necessary repair measures It is preferable that the apparatus further includes contents description steps S11a to S11e. This is to explain a method for proper maintenance in the process of improving the content and the state of the exception in the normal determination step (S10a) to the power supply failure determination step (S10e).

The method may further include a database storing step of storing a test analysis result for each vehicle inspected for each of the normal determination step (S10a) to the power supply failure determination step (S10e) and storing the database including the history of each vehicle. It is preferred to be configured.

Next, a vehicle condition inspection analysis apparatus using the ground level signal of the vehicle according to an embodiment of the present invention will be described.

The vehicle state inspection and analysis apparatus 100 using the ground level signal of the vehicle is large, as illustrated in FIG. 7, and includes a sensor input / output connection unit 110, a main control unit 120, a display unit 130, and an operation input unit 140. It characterized in that it is configured to include.

First, the sensor input / output connection unit 110 will be described. As shown in FIG. 7, the sensor input / output connection unit 110 is connected to a sensor signal output unit 20 including an OBD-2 connector 10 of the vehicle, and the ground necessary for the sensor signal input step S1. General information related to the driving state of the angle drive system related to engine control, including the output signal s of the level sensor, the engine speed signal r, and the voltage signal V of the battery, In the related art, the service data may be referred to as service data, hereinafter referred to as service data). Meanwhile, as illustrated in FIG. 8, the sensor signal output unit 20 is a ground line (sensor) of electrical components such as electronic equipment of a vehicle through a voltage measuring instrument (technologists belonging to the art collectively referred to as oscilloscopes). Alternatively, when measuring the potential difference between the wiring between the drive system ground part and the internal ground circuit of the control unit and the negative terminal of the battery, it is preferable that the concept be broadly understood as a concept including a signal output part of the voltage measuring instrument.

Next, the main control device 120 will be described. As shown in FIG. 7, the main control device 120 is connected to the sensor input / output connection unit 110 and has a function of performing a vehicle condition inspection analysis method using the ground level signal of the vehicle. The technology for configuring and programming the main control device 120 to have a function of performing a vehicle condition inspection analysis method using the ground level signal of the vehicle is based on a technology level well known in the art. Therefore, detailed description is omitted.

Next, the display unit 130 will be described. As shown in FIG. 7, the display unit 130 is connected to the main control device 120 to visually display an engine combustion state inspection analysis process and results as shown in FIGS. 2 to 6. Have

Next, the operation input unit 140 will be described. As shown in FIG. 5, the operation input unit 140 has a function of being connected to the main control device 120 and receiving a user's operation input. The operation input unit 140 may include any one or more of various input means such as a keyboard, a keypad, a mouse, and a tablet.

On the other hand, the vehicle condition inspection analysis apparatus 100 using the ground level signal of the vehicle of the present invention, as shown in Figure 7, the wireless communication module 150 or the Internet network 160 is connected to the main control device 120 An external terminal device 170 is connected to the main control device 120 using any one or more of the above, and can inquire an execution result of the engine combustion state inspection analysis method using the ground level sensor signal. It is preferred to be configured. In this case, the external terminal 170 may include any one or more of various devices such as a PDA, a smart phone, a tablet PC, and a notebook computer.

Optimal embodiments have been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: OBD-2 Connector
100: vehicle condition inspection analysis device using the ground level signal of the vehicle
110: Sensor I / O connection
120: Main control device
121: main control unit 122:
123: nonvolatile memory 124: volatile memory
130: display section 140: operation input section
150: wireless communication module 160: internet network
170: External terminal

Claims (5)

A sensor signal input step S1 of receiving a sensor signal including an output signal s of the ground level sensor, an engine speed signal r, and a voltage signal V of the battery;
A ground voltage level measuring step (S2) of detecting and measuring a ground voltage level (e) of the output signal (s) of the ground level sensor;
A ground voltage determination step (S3) of comparing the ground voltage level (e) measured in the ground voltage level measurement step (S2) with a reference ground voltage (E);
When the ground voltage level (e) exceeds the reference ground voltage (E) range in the ground voltage determination step (S3), the signal waveform of the ground voltage level (e) is applied to the engine speed signal (r). A rotation proportion determination step (S4) of determining whether or not it occurs in proportion;
When the signal waveform of the ground voltage level (e) is determined to occur in proportion to the engine speed signal r in the rotation proportion determination step (S4), the signal waveform of the ground voltage level (e) of the A noise determination step (S5) of determining whether or not noise n, which is a portion not proportional to the engine speed signal r, is also generated;
When it is determined that the signal waveform of the ground voltage level e is generated only in proportion to the engine speed signal r through the rotation proportion determining step S4 and the noise determining step S5, An acceleration / deceleration step S6 for instructing acceleration / deceleration;
A noise change determination step (S7) of judging whether the noise of the signal waveform of the ground voltage level (e) changes during the acceleration / deceleration step (S6);
It is determined that the signal waveform of the ground voltage level e is not proportional to the engine speed signal r in the rotation proportion determination step S4, or the ground voltage level e in the noise determination step S5. An engine restart instruction step (S8) of instructing the engine restart one or more times when it is determined that a portion of the signal waveform of i) is not proportional to the engine speed signal r;
In the engine restart instruction step (S8), the voltage drop and noise increase determination step (S9) of comparing the decrease level of the voltage signal (V) of the battery with a reference drop voltage (V0) and determining whether the initial ground level is increased. ; Vehicle condition inspection analysis method using a ground level signal of a vehicle, characterized in that comprising a.
The method according to claim 1,
A normal determination step (S10a) of determining that the ground voltage level (e) is less than the reference ground voltage (E) range in the ground voltage determination step (S3);
An injector failure determination step (S10b) of determining injector-related failures when the noise of the signal waveform of the ground voltage level (e) does not change in the noise change determination step (S7);
An ignition system failure determination step (S10c) of determining an ignition system failure when noise of the signal waveform of the ground voltage level (e) increases during acceleration in the noise change determination step (S7);
A ground fault determination step (S10d) of determining that the ground fault of the engine and the vehicle body is poor when the degree of degradation of the voltage signal V of the battery is less than a reference drop voltage V0 in the voltage drop and noise increase determination step (S9);
In the voltage drop and noise increase determination step (S9), when the engine is started, the voltage signal V of the battery is lower than the reference voltage V0 and the ground voltage level e is increased. Determination step of determining the power supply failure of the power supply (S10e); Vehicle status inspection analysis method using a ground level signal of a vehicle, characterized in that the configuration further comprises.
The method according to claim 1,
The sensor signal input step (S1)
And filtering to remove noise of the output signal s of the ground level sensor (S1a),
Contents description steps S11a to S11e for displaying the details of the failures, similar failure cases, and necessary repair measures after the normal determination step (S10a) to the power supply failure determination step (S10e), respectively;
A database storage step of storing a test analysis result for each vehicle inspected for each of the normal determination step (S10a) to the power supply failure determination step (S10e) and storing the database including the history of each vehicle;
Vehicle status inspection analysis method using a ground level signal of a vehicle, characterized in that the configuration further comprises.
A vehicle condition inspection analysis apparatus using a ground level signal of a vehicle for performing a vehicle condition inspection analysis method using a ground level signal of a vehicle according to claim 1,

Connected to the sensor signal output unit 20 including the vehicle OBD-2 connector 10, the output signal of the ground level sensor (s), the engine speed signal (r) required for the sensor signal input step (S1) And a sensor input / output connection unit 110 receiving a sensor signal including a battery voltage signal V.
A main control device (120) connected to the sensor input / output connection unit (110) to perform a vehicle condition inspection analysis method using the ground level signal of the vehicle according to any one of claims 1 to 3;
A display unit 130 connected to the main control device 120 to visually display a vehicle state inspection analysis process and results;
An operation input unit 140 connected to the main control unit 120 and receiving a user's operation input; Vehicle condition inspection and analysis device 100 using a ground level signal of a vehicle, characterized in that comprising a.
The method according to claim 4,
Vehicle status using the ground level signal of the vehicle connected to the main control device 120 using any one or more of the wireless communication module 150 or the Internet network 160 connected to the main control device 120 An external terminal device 170 capable of inquiring the execution result of the inspection analysis method; Vehicle condition inspection and analysis device 100 using the ground level signal of the vehicle, characterized in that it further comprises a.

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