KR100405723B1 - System for measuring aeration for vehicles - Google Patents

Abstract

A vehicle measurement system is disclosed. The aeration measurement system of the disclosed vehicle includes an engine; A heating wire flowmeter installed on one side of the engine to measure aeration; An oil flow measuring unit connected to the hot wire flowmeter and measuring a flow rate and an air content; A signal compensating device connected to the hot wire flowmeter to compensate for signal characteristics according to temperature; And a linearization device connected to the oil flow measuring unit and the signal compensating device so as to generate a signal linearly according to the degree of these devices. According to the present invention, there is an advantage that real-time measurement can be performed online without sampling the aeration characteristics in each part of the engine through a simple correction operation.

Description

Aeration measurement system for vehicles {SYSTEM FOR MEASURING AERATION FOR VEHICLES}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle aeration measurement system. More particularly, the present invention relates to an aeration measurement system of a vehicle improved to minimize measurement errors by real-time measurement of aeration online.

Aeration in the engine lubrication circuit can have a fatal effect on the flow characteristics supplied by the oil pump and on the lubrication characteristics of the engine parts. In particular, consideration is inevitable because the influence on the hydraulic lash adjuster is huge.

Therefore, such aeration detection method is to measure the density by using ultrasonic waves, etc. by sampling at a specific position to be measured, or to measure bulk modulus, or by applying a method such as an upward substitution method, and when air is not mixed at all. Since it is common to measure the relative value with respect to the relative value, the technique for measuring the aeration that changes over time has not been applied yet.

These sampling methods are usually measured off-line because the sampling characteristics and the apparatus for analyzing them cannot be operated at high speeds and thus cannot measure aeration characteristics that change in real time within a cycle.

In addition, if the pressure or temperature conditions in the engine cannot be maintained when sampling at a specific position, it is impossible to accurately measure the amount of air actually mixed, but it is very difficult to maintain this in the conventional method.

Therefore, the existing methods are difficult to measure in real time, and can measure only an average value of tens to hundreds of cycles in a steady state, and since these measurements are offline analysis by sampling, it is necessary to accurately maintain the conditions of each part sampled in the engine. Because of the difficulty, accurate measurement has its limitations.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an aeration measurement system of a vehicle which minimizes errors that may occur due to maintaining the measurement conditions by real-time measurement online.

1 is a block diagram schematically showing the configuration of the aeration measurement system of a vehicle according to the present invention.

2 is a schematic representation of a hot wire tachometer calibration system.

Figure 3 is a graph of an embodiment showing a measurement signal by the hot wire tachometer during aeration.

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

10. Engine

20. Heating wire tachometer

30. Oil flow measuring unit

40. Signal Compensation Device

50. Linearizer

The vehicle aeration measurement system of the present invention for achieving the above object, the engine; A heating wire flowmeter installed on one side of the engine to measure aeration; An oil flow measuring unit connected to the hot wire flowmeter and measuring a flow rate and an air content; A signal compensating device connected to the hot wire flowmeter to compensate for signal characteristics according to temperature; And a linearization device connected to the oil flow measuring unit and the signal compensating device so as to generate a signal linearly according to the degree of these devices.

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

1 is a block diagram schematically showing the aeration measurement system of a vehicle according to the present invention. Here, the description of the configuration of the general aeration measurement system of the vehicle will be omitted, and only the configuration according to the features of the present invention will be described.

Referring to the drawings, the aeration measurement system of a vehicle according to the present invention, the engine 10, the hot wire anemometer (20) installed on one side of the aerosion can be measured in the engine 10 and And an oil flow and aeration measuring unit 30 connected to the hot wire tachometer 20 to measure flow rate and air content, and connected to the hot wire tachometer 20 to compensate for signal characteristics according to temperature. Temperature compensating unit 40 and the oil flow measuring unit 30 and the signal compensating unit 40 which enable the signal generation to be linear according to the degree of these devices. And a signal linearizing unit 50.

The hot wire tachometer 20 is installed on one side of the main gallery, the head gallery, the crankshaft, or the con-rod of the engine 10. In particular, the oil flow measuring unit and the signal compensating device are signal processing devices.

Referring to the operation of the vehicle aeration measurement system according to the present invention having the configuration as described above are as follows. Here, the description of the operation of the general vehicle aeration measurement system will be omitted, and only the operation according to the features of the present invention will be described.

Referring back to the drawings, the aeration measurement system of the vehicle according to the present invention can be measured online (on-line) by mounting the hot wire tachometer 20 at the position to measure the aeration without sampling (sampling) Therefore, it is possible to minimize the error that can occur due to the maintenance of the measurement conditions. In addition, since the response speed of the heating wire flowmeter 20 is also high (typically 40 kHz or more), real time measurement is possible.

In more detail, when the heated hot wire is generally exposed to the oil having flow, the temperature of the hot wire is lowered by heat transfer according to its speed, and in order to maintain it, it must be supplied by the hot wire flowmeter 20 signal processing device. Current changes.

This property is called King's law, and temperature compensation is essential because these signals can change with temperature.

On the other hand, when the hot wire flowmeter 20 encounters an air bubble in addition to oil, a change occurs in the signal characteristic thereof. Therefore, by using the hot wire flowmeter calibration system as shown in FIG. 2, a calibration curve is obtained by pre-testing a reduction characteristic of the signal included in the flow of oil, and then linearized to generate a linearized signal according to aeration. The aeration may be measured in real time by analyzing signals measured in each part of the engine 10 through a compensation circuit.

That is, as shown in Figure 3, the signal of the hot wire tachometer 20 has a characteristic that the air is contained in the oil is rapidly reduced in the waveform that normally fluctuates constantly (fluctuation), the decrease is the amount of air mixed Constant according to.

Therefore, by using a signal processing method such as Fast Fourier Transformation (FFT) or Dicrete Wavelet Transformation (DWT) or differential signal characteristics, the calibration curve for the signal characteristics according to the amount of air mixed in advance is measured, and then the By mounting and applying a variety of methods known to a specific location (for example, using a slip ring on the crankshaft or camshaft), it is possible to solve the problems that may occur during sampling and to measure in real time.

The basic operation according to the present invention applies the signal characteristics of the heating wire flowmeter 20 according to aeration to aeration measurement by applying a signal processing method such as DWT or FFT.

Accordingly, the present invention enables real-time measurement of the aeration characteristics in each part of the engine 10 through sampling and the operation characteristics according to the configuration of FIG. 1 without sampling.

As described above, the vehicle aeration measurement system according to the present invention has the following effects.

The aeration measurement system using the hot wire flowmeter of the present invention has a problem that the conventional measurement system has, namely that it is possible to measure in real time and can be minimized because the measurement is made online by simply mounting at a desired position without sampling. .

Therefore, it is possible to know the real-time characteristics of the aeration that changes according to the operating conditions of the engine. Therefore, it is impossible to measure by the conventional method, for example, it is possible to accurately measure the aeration characteristics according to the oil level change when driving on curved roads or slopes. It is possible to obtain data that can be reflected in oil pan shape or strainer shape design.

In addition, it is possible to measure the aeration that changes in each crank angle unit, so that real-time measurement of data that can be applied to the lubrication circuit design during cold start or acceleration, and also can be applied to oil pump control to minimize aeration in the future.

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.

Claims (2)

An engine; A heating wire flowmeter installed on one side of the engine to measure aeration; An oil flow measuring unit connected to the hot wire flowmeter and measuring a flow rate and an air content; A signal compensating device connected to the hot wire flowmeter to compensate for signal characteristics according to temperature; And a linearization device connected to the oil flow measurement unit and the signal compensator to linearly generate signals according to the degree of these devices. The method of claim 1, The heating wire tachometer is aeration measurement system of the vehicle, characterized in that installed on any one side of the main gallery, head gallery, crankshaft, or condensation of the engine.