KR20010054352A - A valve malfunction detecting apparatus and the method - Google Patents

Abstract

PURPOSE: Detecting device and method for the malfunction of a valve are provided to check the operation of the valve according to the operation of a cam sprocket and a crank sprocket by each stroke of an engine. CONSTITUTION: An electronic control unit receives an engine output, battery voltage, and the temperature of cooling water from a vehicle speed sensor, a voltage sensor, and a water temperature sensor to decide the operation state of a vehicle. In case of a normal operation state of the vehicle, input of signals from a cam sensor and a crank position sensor is decided. By input of the signals, errors in the cam sensor and the crank position sensor are detected. In case of detection of the errors, a second alarming instrument is operated. In case of normal states of the cam sensor and the crank position sensor, the electronic control unit receives first and second signals from the crank position sensor and the cam sensor. Then, the first signal corresponding to an elevating terminal and a lowering terminal of the second signal is detected for deciding an order of a tooth on a crank target wheel generating the first signal. In case of the order of the tooth of the crank target wheel located within a normal range, the normal operation of the vehicle is decided. Otherwise, malfunction of the vehicle is decided for operating the second alarming instrument.

Description

Valve malfunction detection device and detection method {A VALVE MALFUNCTION DETECTING APPARATUS AND THE METHOD}

The present invention relates to an apparatus for detecting a malfunction of a valve and a detection method thereof, and more particularly to an apparatus for detecting a malfunction of a valve using a cam sensor and a crank position sensor and a detection method thereof.

Cam sprocket and crank sprocket are respectively connected to the cam shaft and the crank shaft of the automobile engine, and the cam sprocket and the crank sprocket are rotated by interlocking belts around the cam sprocket and the crank sprocket, respectively. At this time, the ratio of the diameter of the crank sprocket and the cam sprocket is 1 to 2, and generally, when the crank sprocket rotates 2 times, the cam sprocket rotates once and performs the intake, compression, explosion and exhaust stroke of the engine.

However, the intake, compression, explosion and exhaust strokes of the engine are made by the correct linkage between the crankshaft and the camshaft. If this linkage does not occur correctly, the valve may malfunction, and the engine may be damaged due to the collision between the valve and the piston. .

The present invention has been made to solve such a problem, and to provide a detection apparatus and a detection method capable of confirming that the operation of the cam sprocket and the crank sprocket is performed according to the respective strokes of the engine to ensure the correct operation of the valve.

1 is a valve malfunction detection apparatus of the present invention.

Figure 2 is a comparison of the first signal and the second signal of the present invention.

3 is a valve malfunction detection method of the present invention.

In order to achieve the above object, the present invention provides a cam target wheel connected to a cam shaft, a cam sensor for detecting a position of the cam target wheel, a crank target wheel connected to a crank shaft, and a crank target wheel. By using the crank position sensor to determine the position of the cam target wheel and the position of the crank target wheel is compared to detect the malfunction of the valve.

A valve malfunction detection apparatus according to a feature of the present invention includes a crank sprocket, a crank target wheel, a crank position sensor, a cam sprocket, a cam target wheel, a cam sensor, a belt, a timing mark, an electronic control unit and warning means.

The crank sprocket is directly connected to the crank shaft.

The crank target wheel is directly connected to the crank shaft and has a predetermined number of teeth around it.

The crank position sensor forms a first signal that can distinguish between the tooth and the tooth bottom by using a distance difference between the tooth and the tooth bottom formed around the crank target wheel.

The cam sprocket is directly connected to the cam shaft.

The cam target wheel is directly connected to the cam shaft and alternately formed with a fan-shaped recess and a convex portion having the same center angle size around the cam shaft.

The cam sensor forms a second signal that can distinguish the recessed portion from the recessed portion using the distance difference between the recessed portion and the recessed portion formed around the cam target wheel.

The belt is wound around the crank sprocket and the cam sprocket to allow rotation according to the rotation ratio of the crank sprocket and the cam sprocket.

The timing mark is attached to the engine rotation part in order to know the timing at the ignition of the engine, the injection of fuel and the opening and closing of the valve.

The electronic control unit receives the first signal from the crank sensor, receives the second signal from the cam sensor, and is the first signal corresponding to the falling end and the rising end of the second signal formed by the number of teeth of the crank target wheel? The controller detects whether the valve is malfunctioning and outputs a warning signal.

The warning means receives a warning signal output from the electronic control unit to warn the driver of malfunction of the valve.

At this time, one of the predetermined teeth of the crank target wheel is removed to define the removed tooth as the first tooth.

In addition, the engine rotation part is a cam sprocket and a crank sprocket.

Valve malfunction detection method according to a feature of the present invention is a valve malfunction detection apparatus including a crank sprocket, a crank target wheel, a crank position sensor, a cam sprocket, a cam target wheel, a cam sensor, a belt, a timing mark, an electronic control unit and warning means To

The electronic control unit receives the first signal and the second signal from the cam sensor and the crank position sensor, respectively, to determine whether the first signal corresponding to the rising end and the falling end of the second signal is generated by the value of the crank target wheel. Identifying and determining if the order of these values is within a predetermined range,

If outside the predetermined range, the electronic control unit determines that the valve is malfunctioning, and operates the warning means.

At this time, the predetermined range includes the performance of the cam sensor, the shape of the crank target wheel and the cam target wheel, the error of the spatial spacing between the crank position sensor and the crank target wheel, the error of the spatial spacing between the cam sensor and the cam target wheel, and the crank axis. And the camshaft assembly error.

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

1 is a valve malfunction detection apparatus of the present invention.

As shown in FIG. 1, the valve malfunction detection apparatus of the present invention includes a crank sprocket 100, a crank target wheel 110, a crank position sensor 120, a cam sprocket 130, a cam target wheel 140, and a cam sensor. 150, the belt 160, the electronic control unit 170, the first warning means 180, the second warning means 190 and the belt idler 200.

The crank sprocket 100 is directly connected to the crank shaft.

The crank target wheel 110 is directly connected to the crank shaft and has a predetermined number of teeth around it. At this time, one of the predetermined teeth is removed to define a position where the removed tooth is the first tooth.

The crank position sensor 120 forms a first signal that can distinguish the tooth from the tooth bottom by using a distance difference between the tooth and the tooth bottom formed around the crank target wheel 110.

The cam sprocket 130 is directly connected to the cam shaft.

The cam target wheel 140 is directly connected to the cam shaft, and the recessed portion and the convex portion of the fan shape having the same center angle size are alternately formed around the cam shaft.

The cam sensor 150 forms a second signal that can distinguish the recessed portion from the recessed portion by using a distance difference between the recessed portion and the recessed portion formed around the cam target wheel 140.

The belt 160 is wound around the crank sprocket 100 and the cam sprocket 130 so that rotation occurs according to the rotation ratio of the crank sprocket 100 and the cam sprocket 130.

The timing mark 210 is a mark attached to the engine rotation part in order to know the timing at the ignition of the engine, the injection of fuel, and the opening and closing of the valve.

The electronic control unit 170 receives an engine output, a battery voltage, and a cooling water temperature to determine a vehicle driving condition in each of the vehicle speed detection sensor, the voltage detection sensor, and the water temperature sensor. In addition, the electronic control unit 170 receives a first signal formed by the teeth and the bottom of the crank target wheel 110 from the crank sensor, and the second formed by the recessed and recessed portions of the cam target 로부터 from the cam sensor 150. The signal is input to determine whether the first signal corresponding to the falling end and the rising end of the second signal is a signal formed by the value of the crank target wheel 110 to detect whether the valve is malfunctioning. If a malfunction of the valve is detected, the electronic control unit 170 outputs a warning signal. At this time, the rising end represents the moment when the second signal is changed from 'low' to 'high', and the falling end represents the moment when the second signal is changed from 'high' to 'low'.

FIG. 2 is a comparison diagram of the first signal and the second signal of the present invention. FIG. 2A shows the waveform of the first signal and FIG. 2B shows the waveform of the second signal.

As shown in FIG. 2A, the first signal is a signal formed by the crank position sensor 120 using the distance between the teeth and the bottom of the tooth when the number of teeth of the crank target wheel 110 is 60, as shown in FIG. 2B. The second signal is a signal formed by the cam sensor 150 when the recessed portion and the convex portion are each formed at a center angle of 180 °.

At this time, since the timing mark 210 displayed on the crank sprocket 100 and the cam sprocket 130 and the timing mark 210 displayed on the fixed body are aligned, the first signal appearing at the rising and falling ends of the second signal is determined. have. That is, the number of teeth of the crank target wheel 110 determines whether the first signal appears at the rising and falling ends of the second signal. By comparing the first signal with the second signal in this way, a malfunction of the valve timing can be detected. However, an error occurs in the first signal appearing at the rising and falling ends of the second signal due to various reasons. When the first signal appearing at the rising and falling ends of the second signal is within a predetermined range, the valve is normal. It can be said to work. At this time, the cause of such an error is caused by the performance of the cam sensor, the shape of the crank target wheel 110 and the cam target wheel 140, the crank position sensor 120, between the cam sensor 150 and each target wheel. Errors of spatial spacing and assembly errors of crankshaft and camshaft.

The first warning means 180 warns the driver of this when the cam sensor 150 and the crank position sensor 120 have failed.

The second warning means 190 receives a warning signal output from the electronic control unit 170 to warn the driver of malfunction of the valve.

The belt idler 200 is a sprocket attached to adjust the tension of the belt 160.

3 is a flowchart of a valve malfunction detection method according to the present invention.

As shown in FIG. 3, the valve malfunction detection method of the present invention includes a detection condition determination step S310, a failure determination step S320 of the cam sensor 150 and a crank position sensor 120, and a first warning means 180. ) Operation step S330, valve malfunction determination step S340, and second warning means 190 operation step S350.

The electronic control unit 170 receives the engine output, the battery voltage, and the water temperature of the coolant from the vehicle speed detection sensor, the voltage detection sensor, and the water temperature sensor, respectively, and determines whether the vehicle is in a normal operating state to detect malfunction of the valve. (S310).

When it is determined that the electronic control unit 170 is in a normal operating state, it is determined whether a signal is input from the cam sensor 150 and the crank position sensor 120 to determine whether the cam sensor 150 and the crank position sensor 120 are broken. If it is determined that the failure (S320) the second warning means 190 is operated (S330).

When the electronic control unit 170 determines that the cam sensor 150 and the crank position sensor 120 are normal, the electronic control unit 170 may determine the first signal from the crank position sensor 120 and the cam sensor 150, respectively. If the first signal corresponding to the rising end and the falling end of the second signal is received by the second value of the crank target wheel 110, it is determined that the signal is generated. If it is determined (S340), otherwise it is determined that the malfunction is operated to operate the second warning means 190 (S350).

The embodiment of the present invention described above is only one embodiment, and the present invention is not limited to the above-described embodiment, and of course, many modifications and variations are possible.

As described above, the valve malfunction detection apparatus and detection method thereof of the present invention can minimize damage to the engine by detecting a malfunction of the valve.

Claims (5)

A crank sprocket directly connected to the crank shaft; A crank target wheel directly connected to the crank shaft and having a predetermined number of teeth around the crank shaft; A crank position sensor for forming a first signal for distinguishing the tooth and the tooth bottom by using a distance difference between the tooth and the tooth bottom formed around the crank target wheel; A cam sprocket directly connected to the cam shaft; A cam target wheel which is directly connected to the cam shaft and has a concave portion and a convex portion having a fan shape having the same center angle as the circumference of the cam shaft; A cam sensor for forming a second signal that can distinguish the recessed portion from the recessed portion by using a distance difference between the recessed portion and the recessed portion formed around the cam target wheel; A belt surrounding the crank sprocket and the cam sprocket to allow rotation according to the rotation ratio of the crank sprocket and the cam sprocket; A timing mark affixed to the engine rotating portion to know timing of ignition of the engine, injection of fuel, and opening / closing of the valve; Is the first signal received from the crank sensor, the second signal from the cam sensor, the first signal corresponding to the falling end and the rising end of the second signal is a signal formed by the second value of the crank target wheel An electronic control unit for determining whether the valve is malfunctioning and outputting a warning signal; And And warning means for receiving a warning signal output from the electronic control unit to warn the driver of a malfunction of the valve. The method of claim 1, And remove one of the predetermined teeth of the crank target wheel to define the removed tooth as the first tooth. The method of claim 1, And said engine rotation part is a cam sprocket and a crank sprocket. In the valve malfunction detection device comprising a crank sprocket, a crank target wheel, a crank position sensor, a cam sprocket, a cam target wheel, a cam sensor, a belt, a timing mark, an electronic control unit and a warning means, The electronic control unit receives a first signal and a second signal from the cam sensor and the crank position sensor, respectively, and a first signal corresponding to the rising end and the falling end of the second signal is generated by the number of teeth of the crank target wheel. Determining whether it is a signal and determining whether the order of the values is within a predetermined range; And And operating the warning means by the electronic control unit determining that the valve is malfunctioning when out of the predetermined range. The method of claim 4, wherein The predetermined range includes the performance of the cam sensor, the shape of the crank target wheel and the cam target wheel, the error of the spatial spacing between the crank position sensor and the crank target wheel, and the spatial spacing between the cam sensor and the cam target wheel. A valve malfunction detection method comprising an error and an assembly error of the crankshaft and the camshaft.