KR101910422B1 - Method and apparatus for controlling half-moon type cam of vehicle - Google Patents

Abstract

The present invention discloses a method and apparatus for cam control of a vehicle. According to the present invention, a first type of cam position signal supplied from the cam position sensor is converted into one of a plurality of types of cam position signals other than the received first type of cam position signal, The control unit controls the intake and exhaust valves by receiving a crank position signal supplied from the outside so that the cam position signal received on the basis of the cam position signal supplied from the cam position sensor and the long tooth and the tooth number of the crank position signal is supplied to the cam driving unit It is possible to provide compatibility between the cam position sensor and the cam driving unit by converting the cam position signal into an applicable form of the cam position signal and supplying the same to the cam driving unit, thereby further improving the reliability of the product.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cam control device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for controlling a cam of a vehicle, and more particularly, to a cam control apparatus and method for a vehicle which can control other types of cams through software logic for controlling a multi- will be.

In general, when the engine is in the intake stroke, the crank moves the piston downward, the cam opens the intake valve, and controls the exhaust valve close. During the compression stroke of the engine, the crank performs fuel injection while moving the piston upward, And the exhaust valve are both closed. In the engine explosion stroke, the crank moves the piston upwardly, then moves the piston downward after ignition, and then the cam closes both intake and exhaust valves. Here, compression and explosion strokes occur almost simultaneously.

On the other hand, at the time of the exhaust stroke of the engine, the crank moves upward the piston immediately after the explosion, and the cam closes the intake valve and controls the opening of the exhaust valve.

In the case of a four-stroke four cylinder which is widely used as an engine for an automobile, the camshaft makes one revolution while the crankshaft makes two rotations to complete one cycle (intake / compression / explosion / exhaust).

Therefore, when the speed of the engine is constant, the speed of the camshaft is half the speed of the crankshaft, and one crank position signal per cylinder (at least four for a typical four-cylinder vehicle) is needed to determine the position of the crankshaft. Only one cam position signal for confirming the TDC (top dead center) of the No. 2 cylinder was required.

This cam position sensor is provided with at least four slots for detecting a crank position signal and at least one slot for detecting a cam position signal on one target plate at the same time. A groove (concave) groove (Convex / pin type) using a protruding part by projecting or grooving a groove with a pin, and a type (half-moon type) making a circular part of the target plate larger by half the circumference. Appear differently.

 Therefore, in the conventional vehicle, there is no compatibility between the cam position sensor that outputs the camshake signals of different forms according to the shape of the target plate and the cam driving unit that controls the intake and exhaust valves in accordance with the cam position signal provided from the cam position sensor . For example, when the crankshaft has two trigger signals provided from a semicircular target plate based on the cam position signal of the cam position sensor that provides a cam position signal having eight trigger signals from the camshaft, It was impossible to intermittently control the cam driving unit driven by the cam position signal.

Accordingly, the present invention proposes a method for providing compatibility between the cam position sensor and the cam driving unit.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a cam position sensor that converts a cam position signal supplied from a cam position sensor into a cam position signal applicable to the cam driver, Which is capable of providing compatibility between the cam position sensor and the cam driving unit.

In order to achieve the above object, according to a first aspect of the present invention,

Receiving a first type of cam position signal supplied from a cam position sensor;

Converting one of the remaining plurality of types of cam position signals except for the received first type of cam position signal to derive a second type of cam position signal; And

And controlling the intake and exhaust valves by receiving the converted second cam position signal and a crank position signal supplied from the outside.

Here, the cam position signal of the first form may be,

It is preferable that the cam position signal includes eight trigger signals when two long-tooth sensing of the crank position signal received when the crankshaft makes two revolutions.

Here, the cam position signal of the second type may be,

A cam position signal that is triggered when a third trigger signal of the first type of cam position signal is received and is triggered when a seventh trigger signal is received.

Wherein the second step of deriving the cam position signal comprises:

Determining whether a first trigger signal of eight trigger signals of the first type of cam position signal is received after detecting the long tooth of the crank position signal,

Deriving a trigger number of a current cycle based on a difference between the number of triggers of the crank position signal at the time when the current cam position signal is triggered and the predetermined reference number when the first trigger signal of the cam position signal is received,

Determining whether a sum of the number of triggers of the derived current period and the number of triggers of the crank position signal in the period before the current cycle reaches a first determination reference value that is a predetermined maximum threshold value,

When the sum of the number of triggers of the current cycle and the number of triggers of the previous cycle derived as the determination reaches the first determination reference value, the cam position signal of the second type at the time when the cam position signal of the first type is triggered next, Quot; high level "

And storing the trigger number of the current period as the trigger number of the previous period.

Meanwhile, in the second mode of deriving the cam position signal,

When the sum of the trigger number of the current cycle and the trigger number of the previous cycle derived as the determination result does not reach the determination reference value, the sum of the derived current cycle trigger number and the trigger number of the previous cycle is a predetermined minimum threshold value Determining whether a reference value has been reached,

When the sum of the trigger number of the present cycle and the trigger number of the previous cycle derived as the determination reaches the second determination reference value, the cam position signal of the second type at the next trigger point of the first type cam position signal is " &Quot; < / RTI >

 In order to achieve the above object, according to a first aspect of the present invention,

A cam position signal receiving unit for receiving a cam position signal of a first type supplied from a hall sensor after forming a plurality of grooves of the camshaft,

A cam position signal receiving section for converting the cam position signal of the first type of the cam position signal receiving section into a cam position signal of a second type generated from a cam having a semicircular target formed with a half of the circumference of the circular section of the camshaft,

And a cam driving unit for interrupting the intake and exhaust valves with the cam position signal of the second type of the cam position signal converting unit.

Here, it is preferable that the cam position signal of the first form includes eight trigger signals when the crankshaft is rotated two times and two long tuses are detected.

Here, the cam position signal of the second type is triggered to be " high level " when the third trigger signal of the cam position signal of the first type of the cam position signal receiving section is received, Quot; level ".

As described above, the cam control method and apparatus of the vehicle according to the embodiment of the present invention can detect the cam position signal received on the basis of the cam position signal supplied from the cam position sensor and the long tooth and the tooth number of the crank position signal, It is possible to provide compatibility between the cam position sensor and the cam driving unit by converting the cam position signal into a cam position signal applicable to the cam driving unit and supplying the cam position signal to the cam driving unit, thereby further improving the reliability of the product.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further understand the technical idea of the invention. And should not be construed as limiting.
1 is a diagram showing a configuration of a cam control device for a vehicle according to an embodiment of the present invention.
2 is a waveform diagram showing an output signal generated in the cam control apparatus shown in Fig.
3 is a flowchart illustrating a cam control process of a vehicle according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

FIG. 1 is a view showing a cam control device of a vehicle according to an embodiment of the present invention, and FIG. 2 is a waveform diagram of signals generated in the cam control device of FIG. The cam control device of the vehicle according to the embodiment of the present invention will be described by way of example only with reference to the cam control device shown in Figs.

The cam control device of the vehicle to which the embodiment of the present invention is applied has a configuration for converting the cam position signal supplied from the cam position sensor into a cam position signal applicable to the cam driving part and supplying the cam position signal to the cam driving part, An example of an engine control unit (ECU) to which the present invention is applied includes a cam position signal receiving unit 10 for receiving a first type of cam position signal to be received and a cam position signal receiving unit 10 for converting the first type cam position signal to a second type cam position signal And a cam driving section 50 for interrupting the intake valve and the exhaust valve in accordance with the cam position signal conversion section 30 and the cam position signal of the second mode.

Here, the cam position signal receiving unit 10 is provided to receive the first type of cam position signal received according to the rotation of the camshaft.

Here, the crank position signal generated by the tooth and the long tooth and the cam position signal of the first type are as shown in Figs. 2A and 2B, respectively. And includes eight trigger signals when the crankshaft is rotated two times and two long tuses are detected.

That is, the cam position signal of the first type is triggered to a " high level " when a predetermined number (three) of tours elapse after detecting the long-tooth of the crank position signal indicating one rotation of the crankshaft (The second trigger signal of the 8th trigger signal) is triggered when a predetermined number (25) of tuses are received.

Further, when the cam position signal of the first type is triggered to " low level ", and when a predetermined number (five) of tusions elapses, the cam position signal is triggered " high level " Then, when a predetermined number (25) of tus passes and a long tooth is detected, the cam position signal is triggered to " low level " (fourth trigger signal of 8 times of trigger signal).

(A long pitcher + a predetermined number (three) of tours) elapses after detection of the long-tooth, which indicates the start of two revolutions of the crank position signal, a "high-level" trigger signal (fifth trigger signal) Then, a trigger signal (sixth trigger signal) of " low level "

When a predetermined number (25) of the crank position signals have passed, the cam position signal is triggered to the " high level " (seventh trigger signal among the eight trigger signals) Is elapsed, the cam position signal is triggered to " low level " (8th trigger signal among 8 trigger signals).

The position of the camshaft at which the trigger signal is generated eight times according to the tooth and the long tooth of the crank position signal is as shown in Fig. 2C.

This first type of cam position signal is provided to the cam position signal conversion section 30. [

The cam position converter 30 is provided to convert one of the plurality of types of cam position signals other than the received first type cam position signal to derive a second type of cam position signal.

Here, the cam position signal of the second form is triggered as " high level " when the third trigger signal of the first type of cam position signal is received and the seventh trigger signal Is a cam position signal triggered " low level " when it is received.

2), when the cam position signal of the first type is triggered a third time, the cam position signal of the second type is triggered to " high level " and the cam position signal of the first type When the seventh trigger is performed, the cam position signal of the second type is triggered to " low level ". At this time, the position of the camshaft is as shown in e) of FIG.

The cam position signal of the second type is the same as the cam position signal generated when the camshaft is half-moon type.

Therefore, the cam driving unit 50 is provided to intermittently control the intake and exhaust valves based on the cam position signal supplied from the meniscus type camshaft.

That is, the cam position signal supplied from the camshaft is of the first type, whereas when the cam driver 50 is to be interrupted based on the cam position signal of the second type, the ECU transmits the cam position signal of the first type to the second And the cam position signal converting unit 30 may be provided as one of hardware and software logic.

In an embodiment of the present invention, the cam position signal of the first type and the cam position signal of the second type can be received and converted into other types of cam position signals only by way of example, A series of processes for receiving and converting may be easily performed by those skilled in the art through the embodiments of the present invention.

In the embodiment of the present invention, " high level " means a signal having a predetermined power source (5 V or 12 V) and " low level " means a signal having a power source of 0 V, The power source size is set by the manufacturer and conversely can be set inversely depending on the type of the sensor that receives the cam position signal, which will be obvious to those skilled in the art, so a detailed description thereof will be omitted.

A series of processes for converting the cam position signal of the first type into the cam position signal of the second type will be described in more detail with reference to Fig. 3 is a flowchart showing a cam control process executed in the engine control unit (ECU) shown in Fig. The cam control process according to the embodiment of the present invention will be described in more detail with reference to FIG. 1 to FIG.

First, the cam position signal receiving unit 10 receives the cam position signal through step 101, and after the detection of the long tooth of the crank position signal, the first trigger signal among the eight trigger signals of the first type cam position signal And if the first trigger signal of the cam position signal is received as a result of the determination, the received first type cam position signal is provided to the cam position signal conversion section 30. [

The cam position signal converting section 30 converts the cam position signal of the first type into the cam position signal of the second type. Here, the cam position signal of the first type is as shown in Fig. 2B), and the cam position signal of the second type is as shown in Fig. 2D).

In step 111, the cam position signal converting unit 30 converts the cam position signal of the first type into the number of triggers (0) of the crank position signal of the current cycle at which the first trigger signal is generated, To the trigger number of the current cycle of the crank position signal. That is, since the long pitch of the crank position signal before the first trigger signal is received is detected, the trigger number of the current cycle of the crank position signal is set to zero.
That is, the trigger number of the cam position signal, the current trigger number of the crank position signal, and the previous trigger number of the crank position signal are as follows.
Trigger number 2 3 4 5 6 7 8 One 2 3 4 5 6 Number of triggers in the current cycle 0 5 25 5 5 25 5 25 25 5 25 5 5 Number of triggers in previous cycle 0 0 5 25 5 5 25 5 25 25 5 25 5 Total trigger count 0 5 30 30 10 30 30 30 50 30 30 30 10

In step 111, if the cam position signal is triggered to " high level ", the cam position signal of the first type is set to " high level " The difference between the number of teeth of the crank position signal and the predetermined reference number is derived as the current trigger number.

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The cam position signal converting unit 30 converts the cam position signal of the first type derived through the step 113 into the number of triggers of the current cycle at which the trigger signal is received, A sum of the number of triggers in the previous cycle, which is the number of triggers of the position signal, and determines whether the sum of the calculated triggers has reached the first threshold 50, which is a preset maximum limit value.

When the trigger number of the current cycle and the trigger number sum of the previous cycle reach the first determination reference value, as shown in Table 1, when the first type of cam position signal is triggered at the next triggered time, The signal is triggered to " high level " (step 115)

For example, referring to FIG. 2 and Table 1, the number of triggers of the current cycle at the time of generation of the second trigger signal of the first type of cam position signal is 25, and the number of triggers of the previous cycle is 25, And is triggered to " high level " at the time point when the position signal is triggered the third time.

The cam position signal converting unit 30 stores the number of triggers of the current cycle derived in the step 111 as the number of triggers of the previous cycle (step 117).

In step 118, the cam position signal converter 30 determines whether the ignition is turned off. If the ignition is turned off, the cam position signal converter 30 terminates the program. If the ignition is not turned off, the cam position signal converter 30 proceeds to step 101 do.

If the sum of the number of triggers derived in step 113 does not reach the first determination reference value, the cam position signal converting unit 30 proceeds to step 119 to calculate the number of triggers of the current cycle It is judged whether or not the sum of the number of triggers in the previous period reaches the second judgment reference value 10 which is the preset lowest threshold.

That is, when the trigger sum reaches the second determination reference value, the cam position signal of the second type is triggered through step 119 as " low level "

For example, referring to FIG. 2 and Table 1, when the sixth trigger signal of the first type of cam position signal is received, the number of triggers in the current cycle is 5 and the number of triggers in the previous cycle is 5, 2 judgment reference value 10 is reached, and thus, when the seventh first type of cam position signal is triggered, the second type of cam position signal is triggered to " low level " 121).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

The first cam position signal supplied from the cam position sensor is converted into one of the remaining cam position signals except for the received first cam position signal and then the converted second cam position signal and the externally supplied crank The cam position signal received from the cam position sensor and the cam position signal received on the basis of the number of teeth and the number of teeth of the crank position signal can be supplied to the cam The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the scope of the present invention. Reliability, and further performance efficiency, and the availability of the applicable vehicle or the availability of the vehicle Is not only sufficient but also practically usable because it can be practically carried out clearly.

Claims (8)

Receiving a first type of cam position signal supplied from a cam position sensor;
Converting the received first type of cam position signal to derive a second type of cam position signal; And
And controlling the intake and exhaust valves by receiving the converted second cam position signal and a crank position signal supplied from the outside,
Wherein deriving the second type of cam position signal comprises:
Determining whether a first trigger signal of eight trigger signals of the first type of cam position signal is received after detecting a long-tooth of the crank position signal;
Deriving a trigger number of a current cycle based on a difference between a trigger number of the crank position signal and a preset reference number at the time when the current cam position signal is triggered when the first trigger signal of the cam position signal is received;
Determining whether a sum of the number of triggers of the derived current period and the number of triggers of the crank position signal in a period before the current cycle reaches a first determination reference value that is a predetermined maximum threshold value;
When the sum of the trigger number of the current cycle and the trigger number of the previous cycle derived as the determination reaches the first determination reference value, the cam position signal of the second type is shifted to the high Level; And
And storing the number of triggers of the current cycle as the number of triggers of the previous cycle. The motorcycle according to claim 1, wherein the cam position signal
Wherein the cam position signal is a cam position signal including eight trigger signals when detecting two longtos of a crank position signal received when the crankshaft makes two revolutions. 3. The image pickup apparatus according to claim 2,
Wherein the cam position signal is triggered when a third trigger signal of the first type of cam position signal is received and is a cam position signal triggered when a seventh trigger signal is received. delete 2. The method according to claim 1, wherein the deriving the cam position signal of the second form comprises:
When the sum of the trigger number of the current cycle and the trigger number of the previous cycle derived as the determination result does not reach the determination reference value, the sum of the derived current cycle trigger number and the trigger number of the previous cycle is a predetermined minimum threshold value Determining whether a reference value has been reached,
When the sum of the trigger number of the present cycle derived and the trigger number of the previous cycle reaches the second determination reference value, the cam position signal of the second type at the next trigger point of the cam position signal of the first type is changed to the low level Wherein the step of controlling the cam of the vehicle comprises the step of triggering. A cam position signal receiving unit for receiving a cam position signal of a first type supplied from a hall sensor after forming a plurality of grooves in a target plate of a slot for sensing a camshaft position;
A cam position signal converting section for converting the cam position signal of the first type of the cam position signal receiving section into a cam position signal of a second type generated from a cam having a semicircular target formed with a half of a circumference of the circular section of the camshaft; And
And a cam driving section for interrupting the intake and exhaust valves with the cam position signal of the second type of the cam position signal converting section,
Wherein the cam position signal conversion unit comprises:
After detecting the long tooth of the crank position signal, determines whether a first trigger signal among the eight trigger signals of the first type cam position signal is received,
Wherein when a first trigger signal of the cam position signal is received, a trigger number of the current cycle is derived based on a difference between the number of triggers of the crank position signal at the time when the current cam position signal is triggered and the preset reference number,
Determines whether the sum of the number of triggers of the derived current period and the number of triggers of the crank position signal in the period before the current cycle reaches a first determination reference value having a predetermined maximum threshold value,
When the sum of the trigger number of the current cycle and the trigger number of the previous cycle derived as the determination reaches the first determination reference value, the cam position signal of the second type is shifted to the high Level,
Storing the number of triggers of the current cycle as the number of triggers of the previous cycle,
A cam control device of a vehicle. 7. The method according to claim 6,
Characterized in that it includes eight trigger signals when the crankshaft is rotated two times and two long throws are detected. The method of claim 6, wherein the second type of cam position signal
Characterized in that the cam position signal is a cam position signal which is triggered to a high level when a third trigger signal of the first type cam position signal of the cam position signal receiving section is received and triggered to a low level when a seventh trigger signal is received .

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