KR100482540B1 - Method of ascertaining operating state of continuously variable valve timing apparatus - Google Patents

Abstract

Disclosed is a method of checking an operating state of a continuously variable valve timing (CVVT) device. The method of confirming the operation state of the continuously variable valve timing device disclosed is (a) detecting the first falling edge of the first crank signal after the check start and before the operation of the continuously variable valve timing device, and the first falling edge at the next rotation. Detecting a portion, receiving an engine RPM signal from the crank signal, checking the falling edge portion of the cam signal to obtain cam time, and confirming the continuously variable valve timing through a process of measuring the timing of the cam shaft; (b) giving a full advance signal of the oil control valve of the continuously variable valve timing to the multi ECU of the vehicle; (c) after the full advancement, confirming continuous variable valve timing; (d) determining NG or OK and displaying the same on the display device. According to the present invention, there is an advantage that the quality of the continuously variable valve timing device and the engine can be improved.

Description

METHOOD OF ASCERTAINING OPERATING STATE OF CONTINUOUSLY VARIABLE VALVE TIMING APPARATUS}

The present invention provides a continuous variable valve timing CVVT; Continuously Variable Valve Timing) The present invention relates to a method for checking an operating state, and more particularly, to a method for checking an operating state of a continuously variable valve timing device for contributing to early quality assurance of a continuously variable valve timing and an improvement in engine quality.

Referring to the inspection principle of the continuous variable valve timing apparatus, as shown in FIG. 1, a crank position sensor 11 and a cam position sensor 12 installed on one side of the engine 10. And the sensors (11, 12) to confirm that the engine timing (engine timing) is assembled correctly, and to determine the OK or NG in the range of about 6 degrees.

The inspection of the present continuous variable valve timing apparatus determines the timing OK when the 54th falling edge portion of the crank signal matches the falling edge portion of the cam signal.

On the other hand, the timing error is ± 3 degrees due to the backlash of the timing belt and the timing chain.

By the way, in the case of the continuously variable valve timing apparatus, since the engine timing changes, the operation of the continuously variable valve timing apparatus cannot be confirmed by the fixed timing comparison, and the angle detection within ± 2 degrees is impossible.

The present invention has been made to solve the above problems, a method of checking the operating state of the continuous variable valve timing device to determine the operating state of the continuous variable valve timing device by measuring the change in the timing within ± 2 degrees range The purpose is to provide.

In order to achieve the above object, a method of confirming an operating state of a continuous variable valve timing apparatus according to the present invention includes: (a) detecting the first falling edge of the first crank signal after a check start before operating the continuous variable valve timing apparatus; Using this as a reference point, the first falling edge is detected at the next rotation, the engine RPM signal obtained by Equation 1 below is received from the crank signal, and the cam edge is checked by checking the falling edge of the cam signal. Confirming the continuously variable valve timing through a process of measuring the timing of the camshaft; (b) giving a full advance signal of the oil control valve of the continuously variable valve timing to the multi ECU of the vehicle; (c) after the full advancement, confirming continuous variable valve timing; (d) determining NG or OK and displaying the result on the display device. In the step (c), the confirmation of the continuous variable valve timing includes (a) the continuous variable valve timing of the engine to the multi ECU. Obtaining the continuously variable valve timing in the same manner as the method for obtaining the reference timing after full advance; (b) displaying the difference between the reference timing and the timing after the advance on the operation screen; and (c) the difference of the timing It is characterized in that the equipment is automatically judged whether it meets the specification and is carried out by repair. [Equation 1] RPM = 3600 (sec) / 1 rotation once No. 1 falling edge time (sec)-2 times Polling edge time (sec)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic flowchart sequentially illustrating a method for checking an operating state of a continuous variable valve timing apparatus according to the present invention.

Referring to the drawings, the method for checking the operating state of the continuous variable valve timing apparatus according to the present invention is, first, before the operation of the continuous variable valve timing apparatus, after check start, and then, 1 of the first crank signal. Detects the falling falling edge, detects the falling first edge in the next rotation, receives the engine RPM signal from the crank signal, checks the falling edge portion of the cam signal to find cam time, and is shown in FIG. Through the process of measuring the timing of the camshaft 21 as described above, the continuous variable valve timing device is checked (step 110). That is, the crank angle sensor does not determine and determine the height (peak) of the signal, It determines whether the signal goes from low to high (Rising edge) and from high to low (Falling edge). In other words, in the case of the magnetic sensor, when the signal is about 20 mV or more, it is determined to be ON, and when it is about -5 to -10 mV, it is determined to be OFF, and one cycle of ON / OFF is determined as one signal for each crank. By counting the number of OFF (Falling edges) or the number of times the signal is ON (Rising edge), the height of the signal is a high threshold or an OFF (falling edge) If it comes out lower, it is recognized as a signal. This principle is a well-known technique that applies signal waveform analysis such as a crank angle sensor. Then, the total advance of the oil control valve (OCV) of the continuously variable valve timing is applied to a multi ECU, an ECU for testing an engine of a vehicle. , Give a full advanced signal (step 120).

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After the full advancement, the continuous variable valve timing is checked (step 130).

In addition, after confirming in step 130, NG or OK is determined and displayed on the display device as shown in FIG.

In this way, the feedback of the RPM signal is fed back to calculate the timing when the initial angle and the continuous variable valve timing of the camshaft 21 are fully advanced regardless of the falling edge. Check.

In the step 110, the first falling edge signal of the crankshaft 22 is detected and made a reference point. And the RPM is calculated by the following equation 1.

[Equation 1]

RPM = 3600 (sec) / 1 rounding edge time in 1 rotation (sec)-2 rounding edge time in seconds (sec)

The reference timing is obtained by the following equation.

[Equation 2]

360 degrees / {Cam Time (sec)-Cam Position Sensor Time 1 (sec) * RPM / 60}

In operation 120, a full advance signal is provided to an oil control valve (OCV) for supplying oil to the continuous variable valve timing device in order to operate the continuous variable valve timing device in the multi ECU. This advance signal consists of an electrical signal of + 5V.

Further, in the step 130, the confirmation of the continuous variable valve timing, first, the full-advanced continuous variable valve timing of the engine with the multi-ECU, and then obtains the continuous variable valve timing in the same manner as the method for obtaining the reference timing. )

Subsequently, the difference between the reference timing and the timing after advance is displayed on the operation screen (step 220).

Then, the equipment automatically determines whether the difference in timing satisfies the spec and takes it out as a repair (step 230).

Here, after the advancement, the engine control according to the explosion time change is added so that there is no relief of the engine even after the advancement, and an engine control map is added.

In FIG. 3, reference numeral 23 denotes a timing belt and 24 timing marks, respectively. As described above, the present invention provides a multi-ECU system that checks valve timing before a continuous variable valve timing apparatus operates. The full advance signal is given to the oil control valve of the continuous variable valve timing device, and after full advance, the valve timing is checked to determine whether it is defective (NG) or good (OK) and displayed on the display device. In the conventional timing comparison, the operation of the continuous variable valve timing device could not be confirmed, and in particular, the angle detection within ± 2 degrees was not possible. However, the present invention can confirm whether the operation of the continuous variable valve timing device is performed correctly.

As described above, in the method for checking the operating state of the continuously variable valve timing apparatus according to the present invention, a signal is supplied to the oil control valve using a multi ECU to feed back an engine RPM signal indicating that the timing of the cam shaft is changed, and the timing change amount is ± 2. Measure within the range to confirm the operational status of the continuous variable valve timing.

Therefore, it is possible to contribute to securing the early quality of the continuous variable valve timing device and improving the engine quality.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1 is a schematic block diagram showing the inspection principle of a typical continuous variable valve timing apparatus.

2 is a schematic flowchart sequentially showing a method for checking an operating state of a continuous variable valve timing apparatus according to the present invention.

3 is a view schematically showing a timing belt device of a vehicle engine.

4 is a view showing a screen of the display device displaying the operation state check result of the continuous variable valve timing apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

21. Camshaft

22. Crankshaft

23. Timing Belt

Claims (6)

(a) before operation of the continuously variable valve timing device, After check start, the 1st falling edge of the first crank signal is detected and set as the reference point. Detects the first falling edge at the next rotation, receives the engine RPM signal obtained by Equation 1 below from the crank signal, checks the falling edge of the cam signal to find the cam time, and measures the timing of the camshaft. Confirming continuous variable valve timing through a process; (b) giving a full advance signal of the oil control valve of the continuously variable valve timing to the multi ECU of the vehicle; (c) after the full advancement, confirming continuous variable valve timing; (d) determining NG or OK and displaying the same on the display device; In the step (c), the determination of the continuous variable valve timing may include: (a) obtaining continuous variable valve timing in the same manner as the method for obtaining a reference timing after fully advancing the continuous variable valve timing of the engine with the multi ECU; (B) displaying the difference between the reference timing and the timing after the advancement on the operation screen; and (c) automatically determining whether the difference in the timing satisfies the specification and carrying it out for repair. How to check the operating status of the continuously variable valve timing device. [Equation 1] RPM = 3600 (sec) / 1 rounding edge time in 1 rotation (sec)-2 rounding edge time in seconds (sec) delete delete The method of claim 1, wherein in step (a), And said reference timing is obtained by Equation 2 below. [Equation 2] 360 degrees / {Cam Time (sec)-Cam Position Sensor Time 1 (sec) * RPM / 60} The method of claim 1, wherein in step (b), And said advance signal comprises an electrical signal of + 5V. delete