KR20040043807A - Valve timing monitoring control device of engine and method thereof - Google Patents

Abstract

PURPOSE: A monitoring control device of timing of a valve for an engine is provided to improve performance, and to decrease exhaust gas by controlling valve timing accurately with detecting wrong assembling or failure and alarming fault of valve timing to a driver. CONSTITUTION: A monitoring control device of valve timing of an engine comprises a monitoring detecting unit(110) detecting monitoring condition of valve timing of the engine; a knock sensor(120) detecting a knock signal from vibration of the engine by abnormal combustion in knocking while operating the engine; and a control unit(130) sampling the knock signal by analyzing the knock signal from the knock sensor in satisfying the monitoring condition of valve timing, comparing the mean value of the knock signal with the predetermined value, and controlling by deciding normality of valve timing. A warning unit(150) operates and warns the abnormal state of valve timing of the engine corresponding to the warning control signal from the control unit.

Description

VALVE TIMING MONITORING CONTROL DEVICE OF ENGINE AND METHOD THEREOF}

The present invention relates to an apparatus and method for controlling valve timing of an engine, and more particularly, to an apparatus and method for controlling valve timing of an engine.

Typically, the valve timing of an engine has a very large impact on engine performance (torque, power) and fuel economy / emission gas.

If the valve timing of the engine is wrong during initial assembly of the engine, it becomes difficult to monitor it.

The reason why it is difficult to determine whether the valve timing of the engine mounted in a vehicle is normal by using a conventional fixed timing engine or a variable valve timing engine as an example will be described.

For example, in the case of the fixed timing engine, it is possible to see whether the signal of the top dead center (TDC) sensor (or cam sensor) mounted on the intake cam side deviates from the reference value (design value), but the machining tolerance of the cam target wheel Considering engine assembly tolerances and sensor characteristics, it is difficult to determine the accuracy of the valve timing with the absolute position of the cam signal.

In addition, in the case of the variable valve timing engine, the valve timing is controlled with only the relative position difference from the cam signal position at the most angular position after starting the engine.

For this reason, the variable valve timing engine has a problem of controlling the valve timing with an off-optimal timing.

An object of the present invention is to measure the valve timing accurately, to diagnose the failure of valve timing misassembly, etc., the valve timing monitoring control device of the engine that can provide information to the driver if the valve timing is excessively wrong and To provide a method.

1 is a view showing the configuration of a valve timing monitoring control apparatus of an engine according to an embodiment of the present invention.

2 is a flowchart illustrating a valve timing monitoring control method of an engine according to an exemplary embodiment of the present invention.

3 illustrates a knock window section according to an embodiment of the present invention.

In order to achieve the above object, the present invention provides a valve timing monitoring control apparatus for an engine, comprising: a valve timing monitoring detector for detecting a valve timing monitoring condition of the engine; A knock sensor for detecting a knock signal according to vibration of the engine due to abnormal combustion when a knock occurs during operation of the engine; When the valve timing monitoring condition is satisfied, the knock signal inputted from the knock sensor is analyzed, the knock signal is sampled, the average value of the sampled knock signal is obtained and compared with the set knock signal value, and the valve timing is normal according to the comparison result. It is characterized in that it comprises a control unit for determining whether or not to perform a corresponding control operation.

In addition, to achieve the above object, the present invention provides a valve timing monitoring control method for an engine, comprising: detecting a valve timing monitoring condition of the engine; Detecting a knock signal according to vibration of the engine due to abnormal combustion when knock occurs during operation of the engine when the valve timing monitoring condition is satisfied; Analyzing the detected knock signal and sampling the knock signal; Obtaining an average value of the sampled knock signals and comparing them with a set knock signal value; And determining whether the valve timing is normal according to the result of the comparison, and performing a corresponding control operation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

Referring to Figure 1 will be described the configuration of the valve timing monitoring control apparatus of the engine according to an embodiment of the present invention.

An embodiment of the present invention is configured to include a monitoring detection unit 110, a knock sensor 120 (Knock Sensor), a control unit 130, a memory unit 140 in the valve timing monitoring control apparatus of the engine.

The monitoring detector 110 is composed of a plurality of sensors for detecting a valve timing monitoring condition of the engine, the configuration comprising: a coolant temperature detector for detecting a coolant temperature of the engine; An engine speed detection unit detecting a rotation speed of the engine; And an engine load detector for detecting a load state of the engine.

The controller 130 analyzes the respective signals input through the valve timing monitoring detector 110 to determine a valve when the coolant temperature is higher than the set temperature, the engine speed is within the set speed range, or the engine load exceeds the set intake flow rate. It is determined that the timing monitoring condition is satisfied.

Here, signals compared with the signals input through the monitoring detector 110 are preset and stored in the memory 140.

The memory unit 140 includes a ROM and a RAM, and stores respective setting values and programs set in association with valve timing monitoring control of an engine according to an exemplary embodiment of the present invention.

The knock sensor 120 detects a knock signal according to vibration of the engine due to abnormal combustion when a knock occurs during the operation of the engine, and supplies the knock signal to the controller 130.

The controller 130 is configured as an engine control unit (ECU) for performing overall control operations of the engine. In the embodiment of the present invention, in particular, when the valve timing monitoring condition is satisfied, the controller 130 analyzes the knock signal input from the knock sensor 120. Sampling the knock signal, obtaining an average value of the sampled knock signal, comparing the knock signal with the set knock signal value read from the memory unit 140, and determining whether the valve timing is normal according to the result of the comparison, and performing a corresponding control operation. do.

It should be noted that the controller 130 according to the embodiment of the present invention samples the knock signal only in the set knock window period.

Here, the knock window section is set to a section not including the time point at which the intake valve is closed.

For reference, a knock window section refers to an area from a start point and an end point of sampling a knock signal.

In this state, if the average value of the sampled knock signal does not exceed the set knock signal value, the controller 130 monitors the knock signal while changing the set knock window section.

On the contrary, the controller 130 determines that the valve timing is abnormal when the average value of the sampled knock signal exceeds the set knock signal value and generates a warning control signal.

The embodiment of the present invention further comprises a warning unit 150 which is driven according to the input of the warning control signal supplied from the control unit 130 to warn the valve timing abnormal state of the engine.

A method of controlling valve timing monitoring of an engine according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 2 is a flowchart illustrating a method for controlling valve timing monitoring of an engine according to an exemplary embodiment of the present invention, and FIG. 3 is a diagram illustrating a knock window section according to an exemplary embodiment of the present invention.

First, the controller 130 detects a valve timing monitoring condition of the engine through the valve timing monitoring detector 110 in FIG. 2 (S210).

If the valve timing monitoring condition is satisfied, the controller 130 proceeds to step S212 and inputs a knock signal according to the vibration of the engine due to abnormal combustion when a knock occurs during operation of the engine from the knock sensor 120. Receive.

In operation S214, the knock signal received from the knock sensor 120 is analyzed to sample the knock signal.

The knock sensor currently applied to most engines is a kind of accelerometer which determines whether knock occurs by detecting vibration of the engine due to abnormal combustion when knock occurs.

In this case, the controller 130 does not acquire a knock signal in all sections, but samples the knock signal only in a specific section ① as shown in FIG. 3.

For example, in the case of a four-cylinder engine, when cylinder 1 is the combustion process, cylinder 4 is the condition that the intake valve is closed at the end of the intake stroke.

If a knock occurs during combustion, a knock signal usually occurs between 10 and 40 degrees after compression top dead center (TDC).

Precise knock control is performed only by setting the knock window section ① so that the controller 130 can sample a more precise knock signal.

In this case, care should be taken that the knock window section ① must be set to avoid the closing time of the intake valve.

The reason is that the intake valve closes and causes vibration in the engine. Unfortunately, this frequency band is similar to the knock signal generated when abnormal combustion occurs, so the knock sensor 120 cannot distinguish it.

On the other hand, the controller 130 proceeds to step S216 to obtain the average value of the sampled knock signal and compares it with the set knock signal value.

Then, it is determined whether the valve timing is normal according to the comparison result and performs the corresponding control operation.

For example, if the average value of the knock signal sampled in S216 described above does not exceed the set knock signal value, the controller 130 proceeds to S218 and changes the set knock window section ①. Monitor the knock signal.

On the contrary, if the average value of the knock signal sampled in the above-described S216 exceeds the set knock signal value, the controller 130 proceeds to S220, and the knock window section (①) in which the intake valve closing time point is set. Compare if you are inside

If the intake valve closing timing is not within the set knock window section ① in S220, the controller 130 proceeds to S222 and stores the valve timing in the memory unit 140.

If the intake valve closing time point is within the set knock window section (①) in step S220 described above, the controller 130 proceeds to step S224 to determine that the valve timing is abnormal, and the warning part 150. Supply warning control signal.

In the embodiment of the present invention, in the case of the method of fixing the intake valve timing, the knock signal is detected in the knock window section ① that is set during engine operation, or while the set knock window section ① is changed. Accurate valve timing can be measured through the detected knock signal, fault diagnosis such as valve timing misassembly can be performed, and information to the driver can be provided when the valve timing is excessively wrong.

In the case of the method of varying the intake valve timing, the valve timing can be learned so as to be controlled at the optimum valve timing.

In particular, in the case of the variable valve timing engine, more accurate valve timing control can be made possible, thereby improving performance during deployment operation and reducing fuel consumption and exhaust gas during partial load operation.

As described above, the valve timing monitoring control apparatus and method of the engine according to the present invention can enable more accurate valve timing control, thereby improving performance during deployment operation and reducing fuel economy and exhaust gas during partial load operation. There is.

Claims (14)

In the valve timing monitoring control device of the engine, A valve timing monitoring detector for detecting a valve timing monitoring condition of the engine; A knock sensor for detecting a knock signal according to vibration of the engine due to abnormal combustion when a knock occurs during operation of the engine; When the valve timing monitoring condition is satisfied, the knock signal inputted from the knock sensor is analyzed, the knock signal is sampled, the average value of the sampled knock signal is obtained and compared with the set knock signal value, and the valve timing is normal according to the comparison result. Valve timing monitoring control apparatus for the engine, characterized in that it comprises a control unit for determining whether to perform a corresponding control operation. The method of claim 1, wherein the valve timing monitoring detector A coolant temperature detector detecting a coolant temperature of the engine; An engine speed detection unit detecting a rotation speed of the engine; And an engine load detector for detecting a load state of the engine. According to claim 2, wherein the control unit analyzes each signal input through the valve timing monitoring detection unit coolant temperature is above the set temperature, the engine speed is within the set speed range, or the engine load exceeds the set intake flow rate And a valve timing monitoring control device for the engine, characterized in that the valve timing monitoring condition is satisfied. The apparatus of claim 1, wherein the controller samples the knock signal only in a set knock window section. The apparatus of claim 4, wherein the knock window section is set to a section that does not include a time point at which the intake valve is closed. The engine of claim 4, wherein the controller monitors the knock signal while changing the set knock window interval when the average value of the sampled knock signal does not exceed the set knock signal value. Valve timing monitoring control. 5. The apparatus of claim 4, wherein the controller determines that the valve timing is abnormal when the average value of the sampled knock signal exceeds the set knock signal value and generates a warning control signal. 8. The valve timing monitoring control apparatus for an engine according to claim 7, further comprising a warning unit which is driven according to an input of a warning control signal supplied from the control unit and warns a valve timing abnormal state of the engine. In the valve timing monitoring control method of the engine, Detecting a valve timing monitoring condition of the engine; Detecting a knock signal according to vibration of the engine due to abnormal combustion when knock occurs during operation of the engine when the valve timing monitoring condition is satisfied; Analyzing the detected knock signal and sampling the knock signal; Obtaining an average value of the sampled knock signals and comparing them with a set knock signal value; And determining whether the valve timing is normal according to the result of the comparison, and performing a corresponding control operation. 10. The valve timing monitoring condition of claim 9, wherein the valve timing monitoring condition of the engine satisfies the valve timing monitoring condition when the coolant temperature is equal to or higher than the set temperature, the engine speed is within the set speed range, or the engine load exceeds the set intake flow rate. The valve timing monitoring control method of the engine, characterized in that judged. The method of claim 9, wherein the sampling of the knock signal is performed only in a set knock window section. The method of claim 11, wherein the set knock window section is set to a section that does not include a time point at which an intake valve is closed. 12. The method of claim 11, further comprising: monitoring a knock signal while changing the set knock window interval if the average value of the sampled knock signal does not exceed a set knock signal value. Valve timing monitoring control method of the engine. 12. The method according to claim 11, further comprising: determining that the valve timing is abnormal when the average value of the sampled knock signal exceeds a set knock signal value and warning.