KR100762096B1 - A fuel efficiency measurement and trouble diagnostic apparatus for vehicle and the method thereof - Google Patents

Abstract

An apparatus and a method for measuring a fuel ratio and detecting malfunction of a vehicle are provided to improve driving habit of a driver by displaying a fuel ratio and the consumption amount of fuel to the driver. An apparatus for measuring a fuel ratio and detecting malfunction of a vehicle comprises a connector unit(1) attached to a diagnostic link connector of the vehicle. A keypad unit(7) receives various user commands. A storage unit(5) stores user input information, running software, fuel ratio learning information. A signal analyzing unit(3) comprises a CAN analyzer and a signal analyzer that are connected to the connector to extract and output the state information of the vehicle. A control unit(4) stores information output from the signal analyzing unit, and learned fuel ratio information of the vehicle in the storage unit. A display unit(6) outputs a fuel ratio when the vehicle actually runs.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fuel efficiency measurement apparatus,

1 is a block diagram of an apparatus for measuring and diagnosing fuel consumption of a vehicle according to an embodiment of the present invention,

FIG. 2 is a flowchart showing a fuel economy learning process by the apparatus of FIG. 1,

FIG. 3 is a flowchart showing a failure diagnosis process based on the oxygen sensor value by the apparatus of FIG. 1,

FIG. 4 is a flowchart showing an entire process of fuel consumption measurement and failure diagnosis by the apparatus of FIG. 1;

DESCRIPTION OF THE RELATED ART [0002]

1: Connector (DLC connector) 2: CAN analyzer

3: Signal analyzer 4: CPU

4a: Fuel consumption measuring module 4b: Fault diagnosis module

5: Memory 6: Display

7: Keypad 8: Power supply

9: Battery

The present invention relates to an apparatus and a method for fuel consumption measurement and fault diagnosis of a vehicle, and it is an object of the present invention to provide an apparatus and a method for fuel consumption measurement and fault diagnosis of a vehicle, And monitoring the value of an oxygen sensor attached to the vehicle, thereby solving the fuel efficiency problem due to the failure of the vehicle.

Due to the surge in oil prices, many drivers have become interested in the fuel economy of their vehicles and know roughly the fuel economy of their vehicles, calculated as "mileage (km) / fuel consumption (L)". However, the fuel economy designated according to the vehicle is indicative of the fuel consumption state at the time of a specific standard driving, and does not indicate the fuel consumption considering driver's driving habit.

As it is well known, the fuel economy of a car is bad or bad, and it is influenced by the number of times of sudden start and sudden acceleration of the driver and the speed of the driver, and sudden start and rapid acceleration and high speed driving cause low fuel efficiency.

However, since drivers can not see the fuel mileage of the vehicle at present, knowing that sudden acceleration and rapid acceleration are not helpful for fuel economy, unexpected driving habits are not fixed, so they push the accelerator pedal without knowing themselves, , It is possible to incur such a large amount of fuel expenses and traffic accidents, and there is a problem that socially the oil is imported more.

In addition, vehicles with a lot of driving in the city are increasing the number of vehicles whose fuel consumption is reduced without knowing the driver due to the decrease of the intake-exhaust efficiency due to the increase of the internal EGR due to accumulation of carbon in the combustion chamber, intake air and exhaust gas engine. It is possible to reduce the exhaust gas and improve the fuel efficiency.

For this reason, there has been a need to make it possible to accurately confirm the fuel efficiency of the vehicle, and to be able to automatically diagnose a fault such as the accumulation state of carbon in the intake system or the engine related to the fuel consumption.

According to this necessity, the conventional technology calculates the fuel consumption of the vehicle by calculating the injector (fuel) injection amount, the engine speed, and the vehicle speed through the communication with the ECU K line and calculates the fuel consumption, and performs the failure by the ECU Respectively.

However, the fuel economy calculation method of the related art does not compensate for the difference in the fuel injection amount despite the same fuel injection time depending on the vehicle, the displacement amount, and the fuel pressure, so that the fuel consumption can be calculated differently from the actual fuel consumption, The protocol is different, and a program operation for matching the program is required, which requires a lot of time and cost to develop the program.

Although the above-described ECU has a designated fault diagnosis function to provide a diagnosis function of the vehicle, it can not diagnose faults due to accumulation of carbon in the intake system or the engine.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems occurring in the prior art, and it is an object of the present invention to provide a fuel injection control system for a vehicle, The learned data is substituted into the actual injector injection time after the injection amount is converted into data, and the actual fuel consumption at the time of driving the vehicle is shown to the driver so that the vehicle can be operated at the best fuel efficiency,

By applying OBD-II protocol, which is commonly used by vehicle manufacturers, and CAN PROTOCOL, which is applied recently, it is possible to solve the problem of developing each ECU communication program for each manufacturer and vehicle,

The fuel consumption measurement and the failure of the vehicle which can keep the condition of the engine at the best condition by monitoring the oxygen sensor and informing the driver of the malfunction of the intake system or the engine system of the vehicle which the ECU can not detect, And an object thereof is to provide a diagnostic apparatus and a method thereof.

In order to accomplish the above object, the present invention provides a fuel consumption measuring and trouble diagnosis apparatus for a vehicle, comprising: a connector unit connected to a K-line and a CAN line and attached to a DLC (Diagnostic Link Connector) of the vehicle; A keypad unit for receiving a user control command; A storage unit for storing user input information, driving software, and fuel economy learning information; (CAN) analyzing section and a signal analyzing section, connected to the connector, for extracting state information of the vehicle including the consumed fuel amount of the vehicle, the injector injection time, the engine speed and the vehicle speed information from the output signal of the DLC of the vehicle, A signal analyzer having a signal analyzer; And a fuel consumption measuring unit for measuring the consumption amount of the user input amount of fuel by detecting the analysis signal outputted from the signal analyzing unit and measuring the consumption amount according to the driving state of the vehicle to generate fuel consumption measurement data at the time of actual driving, A control unit; And a display unit for outputting the fuel consumption during the actual driving.

The signal analyzer preferably includes at least one of a CAN analyzer or a signal analyzer.

The fuel consumption measuring unit detects the running state information including the injector injection time, the engine speed and the vehicle speed information, and measures the fuel injection amount by using the consumed fuel information, the injector injection time, After making data by idling, by driving speed and by engine speed, measure the fuel consumption by dividing the distance according to the vehicle speed.

The controller may be configured to output the injector injection time and engine speed information to the display unit. When the detected value of the oxygen sensor is out of a predetermined range, the controller outputs a failure signal of the intake system and the engine system to the display unit, .

According to another aspect of the present invention, there is provided a fuel consumption measuring method for a vehicle, including: a fuel consumption learning process for collecting data for measuring an actual fuel consumption by a driving state of a vehicle using total consumed fuel; And a fuel consumption measuring step of calculating an actual fuel consumption during driving of the vehicle by using the fuel consumption measurement data measured in the fuel consumption learning process and the driving state information of the current vehicle.

The fuel economy learning process includes a fuel amount setting process in which a user of the vehicle registers and sets an injected fuel amount; A CAN analysis unit and a signal analysis unit including a CAN analysis unit and a signal analysis unit from a signal input through a connector unit connected to a K line and a CAN line and attached to a DLC (Diagnostic Link Connector) Wherein the fuel consumption measuring unit outputs the state information of the vehicle including the consumed fuel amount of the vehicle, the injector injection time, the engine speed and the vehicle speed information, and the fuel consumption measuring unit calculates the consumed fuel amount of the vehicle, A fuel consumption measuring data collection step of accumulating fuel consumption and vehicle speed information in the storage unit; The fuel injection amount per unit time is measured using the injector injection time, the engine speed, and the vehicle speed information until the consumed fuel amount of the user is consumed, and the fuel injection amount is measured by dividing the measured fuel injection amount by the distance according to the vehicle speed, And the fuel consumption measurement data is accumulated in the storage unit.

The driving state information stored in the fuel consumption measurement data collection step is an injector injection time, an engine speed, and vehicle speed information.

The fuel consumption measurement data generation process is a process of data-izing the fuel injection amount per injector injection time according to the idling speed, the running speed, and the engine speed.

The fuel consumption measurement data generation step may further include a fuel consumption output step of measuring and outputting the real time fuel consumption of the driving state using the generated fuel consumption measurement data.

According to the fuel consumption measuring method of the present invention as described above, the driver can accurately grasp the fuel consumption consumed during the actual running of the vehicle, thereby reducing the amount of fuel consumed by detecting poor driving habits or failures in advance.

According to another aspect of the present invention, there is provided a method of diagnosing a vehicle failure, comprising: setting an oxygen sensor measurement range of a steady-state oxygen sensor; And outputting a failure signal when the oxygen sensor measurement value is out of the oxygen sensor measurement range after the oxygen sensor measurement range setting process.

And the failure signal outputted in the failure signal output process is an intake system and an engine system failure signal.

In general, the oxygen sensor in the electronic control engine causes the ECU controlling the engine to determine the increase or decrease of the fuel. Also, since the oxygen sensor senses the amount of oxygen in the engine exhaust gas, the state of the engine can be indirectly confirmed through the signal. In the failure diagnosis method of the present invention using the oxygen sensor value as described above, It is possible to diagnose the malfunction of the intake system or the engine system of the engine.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings which show a preferred embodiment of the present invention.

In the description of the embodiment of the present invention, the connector section is composed of a connector 1, the signal analyzing section is composed of a CAN analyzer 2 and a signal analyzer 3, the control section is a CPU 4, The failure diagnosis unit 4b, the storage unit 5, the memory 5, the display unit 6, and the keypad unit 7, respectively.

1 is a block diagram of an apparatus for measuring and diagnosing fuel consumption of a vehicle according to an embodiment of the present invention.

As shown in FIG. 1, the apparatus for measuring fuel consumption and diagnosing faults of a vehicle according to an embodiment of the present invention includes a connector 1 connected to a DLC of a vehicle, transmits and receives CAN signals to and from the connector 1, And a signal analyzer 3 for receiving a K-line signal and performing signal processing are connected to the CAN analyzer 2 and the SIGNAL analyzer 3. The CAN analyzer 2 and the SIGNAL analyzer 3 are connected to an ECU A CPU (4) having a fuel consumption measuring module (4a) for calculating and outputting actual fuel consumption according to the vehicle condition during running, and a failure diagnosis module (4b) for diagnosing a failure by oxygen sensor signal analysis, A memory 5 for storing a normal value for signal analysis of the CPU 4 and a program for fuel consumption calculation, a display unit 6 for displaying the information, Display, self-diagnosis and car line A power supply unit 8 for receiving the power from the vehicle DLC and for driving the apparatus, and a battery (not shown) for supplying backup power of the system 9). The CPU 4 is connected to a buzzer (not shown) for outputting an output sound indicating the operation state of each function of the vehicle.

In the above configuration, the DLC refers to a device that is forcedly attached to a vehicle for the purpose of repairing a vehicle and diagnosing an exhaust gas item.

In the above-described configuration, the CAN analyzer 2 and the signal analyzer 3 are the signal analysis unit of the present invention, and the CAN analyzer 2 and the signal analyzer 3 can be configured or selectively configured have.

In the above-described configuration, the fuel consumption meter and the failure diagnosis module basically obtain information (injector injection time, etc.) through communication with the ECU of the vehicle. At this time, the information is analyzed through a signal analyzer or a CAN analyzer, which can be selectively configured according to the vehicle.

The fuel consumption measuring and fault diagnosis device of the vehicle of FIG. 1 constructed as described above is attached to a DLC (Diagnostic Link Connector) which is forcibly attached to a vehicle under the OBD-II regulation, and then, to prevent visual disturbance during operation, And the fuel consumption is automatically measured after performing the fuel consumption learning process to display the fuel consumption during the current running and the detected value of the oxygen sensor is analyzed to determine whether the failure due to the accumulation of carbon in the intake system or the engine And performs a diagnostic function.

Fuel economy measurement will be described first. Generally, fuel consumption calculation using communication with an ECU can be performed using injector injection time (ms), vehicle speed (Km / h), and engine speed (rpm). The engine, which is a four-stroke cycle engine, completes one cycle through two rotations (suction-compression-explosion-exhaust). That is, the injector injection time (ms) is the fuel injection amount (cc) per two revolutions. The vehicle speed (km / h) .

First, the equation for calculating the fuel injection quantity using the designated data

Fuel injection amount (cc) = injector injection time (ms) * cylinder number (n) * engine revolution number (rpm) / 2/60.

Here, 2 means one cycle for two revolutions of the engine, and 60 means a value for converting the revolution per minute to the revolution per second.

Therefore, the equation for obtaining the fuel consumption (L)

Fuel ratio L = total mileage / fuel injection amount cc.

That is, by accurately measuring the fuel injection amount cc during the injector injection time according to the running state, it is possible to measure and display the actual fuel consumption by the running state of the vehicle.

However, the fuel injection amount cc according to the injector injection time (ms) shows a great difference depending on the exhaust amount, the fuel pressure, and the injector specification. In addition, since the fuel injection amount cc per injector injection time (ms) is not disclosed for each vehicle, there is no known method. Therefore, in order to accurately measure the fuel injection amount (cc), the total fuel amount actually used, the total injector injection time and the actual traveling distance are required, and the injector injection time in the idling state (vehicle speed 0 km / h) It should be calculated.

That is, in order to measure the actual fuel consumption of the vehicle, the fuel injection amount data per injector injection time is obtained after determining the total injector dispersion time with respect to the actually used fuel amount as shown in FIG. 2, and the fuel consumption can be accurately measured.

FIG. 2 is a flowchart showing a fuel consumption learning process by the fuel consumption measurement module 4a of FIG. 1. Referring to FIG. 2, the fuel consumption learning process as described above will be described below.

As shown in FIG. 2, the user inputs the amount of fuel injected for fuel consumption learning through the keypad 7 and stores it in the memory 5 for execution of the fuel economy learning process. In this case, it is preferable to input the amount of fuel injected at the time when the fuel warning lamp of the automobile is turned on. In this case, the fuel consumption measuring module 4a of the CPU 4 can automatically end the fuel consumption learning process at the time when the fuel warning lamp is turned on after gasoline. However, the end point of the fuel economy learning process may be manually input at the time when the fuel warning lamp is turned on (fuel amount setting process) (S10).

Next, when the driver drives the vehicle and runs, the fuel consumption measuring module 4a mounted in the CPU 4 of the fuel consumption measuring and fault diagnosis apparatus 100 is connected to the CAN analyzer 2 and the signal analyzer 3, The injector injection time, the engine speed, and the vehicle speed information are extracted and stored in the memory 5 (fuel consumption measurement data collection process) (S20).

Thereafter, the fuel consumption measurement module 4a of the CPU 4 determines that the fuel set as a default by the warning light or the user's input is exhausted. That is, the fuel consumption measurement module 4a repeatedly performs the step S20 to collect data for fuel consumption measurement (fuel consumption determination process) (S30) before the warning light is turned on or the user inputs the fuel consumption measurement module 4a.

If it is determined in step S30 that all of the initially set fuel has been consumed, the fuel consumption measurement module 4a generates the fuel consumption measurement data and ends the fuel consumption learning process. The fuel consumption measurement data generated at this time becomes the fuel injection amount per injector injection time. Then, the measured fuel injection amount per injector injection time is data for each driving speed when idling. (Fuel consumption measurement data generation process) (S40)

2, the amount of fuel consumed per unit time can be accurately calculated for each vehicle according to the running state or the running speed, so that the fuel efficiency of the running vehicle can be displayed in real time.

Next, the fault diagnosis process by the oxygen sensor will be explained.

One of the features of the present invention is that the oxygen sensor data is continuously monitored to notify the owner of a failure that is not recognized by the ECU of the automobile and can be repaired using the repair shop.

A typical gasoline engine adjusts the mixture ratio of air and fuel to an air-fuel ratio of 14.7: 1. For precise control of the mixture ratio, the ECU adds or reduces the air volume, or adds or reduces the amount of fuel. At this time, the oxygen sensor is a sensor that notifies the ECU of the mixture ratio of fuel and air. When the engine and the air-fuel ratio are normal, the oxygen sensor repeats up and down movements of 0 to 1V with a duty of 50%, and moves by the amount of controlling the fuel and air in the ECU.

At this time, when the oxygen sensor goes down to the 0V range due to the increase of the air amount due to the intake air leaking or the like, the ECU continuously increases the fuel injection amount in order to adjust the air-fuel ratio.

If the air-fuel ratio control by the ECU is impossible due to the accumulation of carbon in the intake system or the engine or the like as described above, the fuel consumption of the vehicle is inevitably deteriorated. In many cases, the ECU, which controls the electronic control system of the vehicle, decides that the above- .

Therefore, in the present invention, when a threshold value is set for a measured voltage value of an oxygen sensor value, a failure related to fuel consumption that can not be detected by the ECU due to a failure of the intake system or accumulation of carbon in the engine is diagnosed .

Fig. 3 is a flowchart showing a failure diagnosis process by the measurement value of the oxygen sensor as described above by the failure diagnosis module 4a of the CPU 4 in Fig.

As shown in FIG. 3, in the fault diagnosis method based on the measured value of the oxygen sensor of the present invention, first, a range of the oxygen sensor measured value in a steady state is set in order to diagnose the fault (S50).

Next, the failure diagnosis module 4b during the running of the vehicle judges whether the oxygen sensor measurement value inputted from the CAN analyzer 2 and the signal analyzer 3 is inputted and then goes out of the range of the oxygen sensor measurement value set in the step S50 The failure signal is outputted so that maintenance for the failure of the intake system or the engine system can be performed (S60).

FIG. 4 is a flowchart showing the entire process of real-time fuel consumption output and failure diagnosis of the vehicle during running through the fuel consumption learning process and the failure diagnosis process of the fuel consumption measuring and fault diagnosis apparatus 100 of the present invention as described above.

4, after starting the engine (S70), the fuel consumption measuring and fault diagnosis apparatus 100 of the present invention carries out communication with the vehicle (S80) and collects driving state information of the vehicle (S80) . At this time, the traveling state information of the collected vehicle is the injector injection time, the engine speed, the vehicle speed, the oxygen sensor value, and the like.

Thereafter, fuel consumption in the current running state is calculated using the injector injection time, the engine speed, the vehicle speed information, the fuel injection amount information according to the vehicle speed and the engine speed learned in the fuel consumption learning process, It is determined whether the measured value exceeds the range of the measured value of the normal state and the failure diagnosis is performed (S100).

Then, fuel mileage information and failure diagnosis information calculated in S100 are displayed on the display 6 (S110).

In step S120, the CPU 4 periodically monitors whether the engine is turned off and repeats the process from step S80 periodically until the startup is turned off, thereby repeating the fuel consumption measurement, the fuel consumption output, and the failure diagnosis.

The present invention as described above allows the driver to improve the driving habits of the user who exacerbates the fuel cost by showing the fuel consumption and the amount of fuel consumed at present, thereby providing the effect of reducing the fuel cost of the vehicle.

In addition, the present invention provides the effect of enhancing sales of vehicles by stimulating curiosity of automobile enthusiasts showing sensor values such as engine speed, oxygen sensor, and intake air amount.

In addition, the present invention can diagnose faults due to the oxygen sensor value, thereby diagnosing faults in the fuel-related system that fail to detect faults in the ECU, thereby providing an effect of always maintaining the engine condition of the vehicle optimally do.

Claims (14)

A connector portion configured to be connected to a K-Line (K-Line) and a CAN line and attached to a DLC (Diagnostic Link Connector) of the vehicle; A keypad unit for receiving a user control command including a fuel injection amount of the vehicle, a failure diagnosis, and a fuel economy learning process execution command; A storage unit for storing user input information, driving software, and fuel economy learning information; (CAN) analyzing section and a signal analyzing section, connected to the connector, for extracting state information of the vehicle including the consumed fuel amount of the vehicle, the injector injection time, the engine speed and the vehicle speed information from the output signal of the DLC of the vehicle, A signal analyzer having a signal analyzer; Wherein the injector injecting time, the engine speed, and the vehicle speed information are accumulated and stored in the storage unit, and the injector injection time until the consumed fuel amount of the user is consumed, And fuel consumption information of the vehicle is learned by accumulating the fuel injection amount measured by dividing the measured fuel injection amount by the distance based on the vehicle speed and accumulated in the storage unit, A fuel consumption measuring unit for calculating a consumed fuel amount from the learned fuel consumption information and outputting the fuel consumption information as real time fuel consumption information according to a unit moving distance of the vehicle; And a display unit for outputting the fuel consumption at the time of actual running. delete delete delete The apparatus of claim 1, wherein the fuel consumption measuring unit is configured to perform data acquisition of the fuel injection amount per injector injection time according to the running speed and the engine speed when the engine is idling. The apparatus according to claim 1, wherein the controller is configured to output the injector injection time and engine speed information to the display unit. 2. The fuel consumption measuring apparatus according to claim 1, wherein the control unit further comprises a failure diagnostic unit for outputting a failure signal of an intake system and an engine system to a display unit when the detection value of the oxygen sensor is out of a predetermined range. Fault diagnosis device. A fuel amount setting process in which a user of the vehicle registers and sets an injected fuel amount; A CAN analysis unit and a signal analysis unit including a CAN analysis unit and a signal analysis unit from a signal input through a connector unit connected to a K line and a CAN line and attached to a DLC (Diagnostic Link Connector) Wherein the fuel consumption measuring unit outputs the state information of the vehicle including the consumed fuel amount of the vehicle, the injector injection time, the engine speed and the vehicle speed information, and the fuel consumption measuring unit calculates the consumed fuel amount of the vehicle, A fuel consumption measuring data collection step of accumulating fuel consumption and vehicle speed information in the storage unit; The fuel injection amount per unit time is measured using the injector injection time, the engine speed, and the vehicle speed information until the consumption of the injected fuel by the user is measured, and the fuel mileage is measured by dividing the distance according to the vehicle speed, And a fuel consumption measurement data generation step of accumulating fuel consumption measurement data in the storage unit; And a fuel consumption measuring step of calculating a consumed fuel amount from the learned fuel consumption information when the fuel consumption display signal is inputted from the user of the vehicle and outputting the consumed fuel amount as real time fuel consumption information according to the unit moving distance of the vehicle Fuel consumption measurement and fault diagnosis method of vehicle. delete delete The method of claim 8, wherein the step of generating the fuel consumption measurement data is a step of data-izing the fuel injection amount per injector injection time according to the idling speed, the driving speed, and the engine speed. delete 9. The fuel economy learning method according to claim 8, An oxygen sensor measurement range setting process for setting a range of oxygen sensor measurement values in a steady state; And a failure signal outputting step of outputting a failure signal when the oxygen sensor measurement value is out of the oxygen sensor measurement range after the oxygen sensor measurement range setting process. 14. The method according to claim 13, wherein the failure signal outputted in the failure signal outputting step is an intake system and an engine system failure signal.

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