KR101049093B1 - Vibration reducing device and method - Google Patents

Abstract

The present invention relates to an apparatus and method for reducing vibration of a vehicle engine, and when a crankshaft position sensor (CKP) signal is input, converts it into a taco signal, and converts the taco signal into a pulse-shaped signal to compensate for rotation delay. After calculating the rotational speed (RPM) using the pulse-shaped signal, the phase of the balance shaft module is compensated using the calculated rotational speed, and the discharge amount of the oil pump is controlled to reduce the vibration of the balancer shaft module. The vibration of the vehicle engine can be effectively reduced.

Crankshaft position sensor (CKP) signal, engine control unit (ECU), engine revolution speed (RPM: revolution per minute)

Description

Vibration reduction device and its method {ANTI-VIBRATION APPARATUS AND ITS METHOD}

The present invention relates to a vibration reduction technique of an engine, and more particularly, to a vibration reduction device and method suitable for reducing vibration of a vehicle engine using a crankshaft position sensor (CKP) signal of an internal combustion engine. will be.

The present invention is derived from a study performed as part of the energy technology development project of the Ministry of Knowledge Economy [Task No .: 10023878, Task name: Development of a balancing shaft for a low vibration eco-friendly vehicle].

As is well known, internal combustion engines have an engine control unit (ECU), a crankshaft and a device capable of recognizing each position of the crankshaft when the engine is in operation. When in use, it allows control of the injection and ignition (for engines with controlled ignition) in each cylinder.

Accordingly, the position of the piston in the cylinders can be determined according to the information on each position of the crankshaft, and the cycle state of the four-stroke engine (ie, intake, compression, combustion, and discharge) can be identified.

On the other hand, after calculating the unbalanced mass to be compensated based on the engine specifications in order to prevent the vertical vibration of the four-cylinder engine, the balance shaft that produces the same unbalanced mass is manufactured and mounted to compensate for the vibration of the vehicle engine. In the case of the balance shaft module with the built-in oil pump, only the simple flow rate control by the relief valve is possible, thereby limiting the fuel economy improvement by generating unnecessary engine load during the engine movement.

Recently, research has been actively conducted to change the oil pump of the balance shaft module with the built-in oil pump to cope with engine behavior actively.

In the case of vibration reduction of the engine using the balance shaft module as described above, the vibration reduction effect is improved only by having a difference of exactly 180 degrees from the rotational phase of the crankshaft, and the slight phase delay reduces the engine reduction performance and the harmonic vibration component. Is very likely to generate

Here, the mechanical balance shaft module has a mechanism in which the rotational movement of the crankshaft and the gear or chain are interlocked, so that the phase delay is relatively low. However, the electronic balance shaft module has an engine for controlling the variable flow rate. As the phase delay occurs in the process of receiving the rotational behavior as a separate signal, it acts as a factor to reduce the engine vibration reduction performance.

Accordingly, the present invention is to provide a vibration reduction device and method that can improve the vibration reduction performance of the vehicle engine by compensating the vibration of the balance shaft module using the crankshaft position sensor (CKP) signal.

In addition, the present invention is to provide a vibration reduction device and method that can improve the vibration reduction performance of the vehicle engine by controlling the discharge amount of the oil pump using the crankshaft position sensor (CKP) signal.

According to an embodiment of the present invention, a crankshaft signal input unit to which a crankshaft position sensor (CKP) signal is input, a taco signal converter for converting the input crankshaft position sensor signal into a taco signal, and the converted taco A rotation delay compensator for converting a signal into a pulse signal to compensate for rotation delay, a rotation speed calculator for calculating an engine rotation speed using the converted pulse signal, and the calculated engine rotation speed To control the vibration of the balance shaft module and to control the oil discharge amount of the oil pump.

According to another embodiment of the present invention, a step of inputting a crankshaft position sensor (CKP) signal, converting the input crankshaft position sensor signal into a taco signal, and converting the converted taco signal into a pulse signal Compensating the rotation delay by converting to a; and calculating the engine rotational speed using the converted pulse-shaped signal, controlling the vibration of the balance shaft module using the calculated engine rotational speed, oil pump There is provided a vibration reduction method comprising controlling the oil discharge amount of the oil.

The present invention calculates the rotational speed of the engine using the crankshaft position sensor (CKP) signal input through the vibration reduction device, compensates the phase of the balance shaft module according to the calculated rotational speed, and adjusts the discharge amount of the oil pump. By controlling, the flow rate control through the crankshaft position sensor can be optimally maintained in the operating region of the variable oil pump according to the engine behavior, thereby contributing to the improvement of fuel efficiency and exhaust gas reduction of the target engine.

In addition, the present invention can maximize the vibration reduction of the vehicle engine by directly monitoring the generation of inertial force of the engine to accurately compensate the phase of the amount of unbalance that the balance shaft unbalance should compensate.

According to the present invention, when a crankshaft position sensor (CKP) signal is input, the taco signal is converted into a taco signal, and the taco signal is converted into a pulse signal to compensate for the rotation delay, and the rotational speed (RPM: After calculating the revolution per minute, it is to compensate for the phase of the balance shaft module by using the calculated rotation speed, and to control the discharge amount of the oil pump, it is possible to solve the problems in the prior art through such technical means.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Combinations of each block of the accompanying block diagram and each step of the flowchart may be performed by computer program instructions. These computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment such that instructions executed through the processor of the computer or other programmable data processing equipment may not be included in each block or flowchart of the block diagram. It will create means for performing the functions described in each step. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. Instructions stored therein may also produce an article of manufacture containing instruction means for performing the functions described in each block or flowchart step of the block diagram. Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions that perform processing equipment may also provide steps for performing the functions described in each block of the block diagram and in each step of the flowchart.

In addition, each block or step may represent a portion of a module, segment or code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative embodiments, the functions mentioned in the blocks or steps may occur out of order. For example, the two blocks or steps shown in succession may in fact be executed substantially concurrently or the blocks or steps may sometimes be performed in the reverse order, depending on the functionality involved.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a block diagram of a vibration reduction device suitable for reducing engine vibration by using a crankshaft position sensor signal, according to an embodiment of the present invention, a crankshaft signal input unit 102, a taco signal converter 104, The rotation delay compensator 106, the rotation speed calculator 108, and the vibration controller 110 may be included.

Referring to FIG. 1, the crankshaft signal input unit 102 receives a crankshaft position sensor (CKP) signal from an engine control unit (ECU) signal, and detects the position of the crankshaft. A crankshaft position sensor (CKP) signal of variable inductance type is input through the signal.

The taco signal converter 104 converts a variable inductance type crankshaft position sensor (CKP) signal into a taco signal, and the crankshaft position sensor signal having a variable inductance type through the crankshaft signal input unit 102. When is input, the crankshaft position sensor signal is normalized and converted into a taco signal in the form of a revolution.

For example, FIG. 3 is a diagram illustrating a crankshaft position sensor signal according to an exemplary embodiment of the present invention, in which a variable inductance type crankshaft position sensor signal (left signal) is normalized and a taco signal (right signal) is formed. You can see that it is converted to).

Next, the rotation delay compensator 106 compensates for the rotation delay in consideration of the missing tooth per rotation, and compensates for the missing teeth appearing discontinuously in the taco signal converted through the taco signal converter 104. The rotational delay is compensated for by converting into a pulse-free signal.

In addition, the rotational speed calculating unit 108 calculates the rotational speed (RPM) of the engine by using a signal in the form of a pulse, and uses the signal in the form of a pulse whose rotational delay is compensated by the rotational delay compensation unit 106. The engine speed (RPM) is calculated according to the revolutions per minute.

In addition, the vibration controller 110 compensates the vibration of the balance shaft module using the rotation speed RPM and controls the discharge amount of the oil pump, and the rotation speed RPM calculated through the rotation speed calculator 108. To monitor the inertia force generation of the engine, thereby compensating for 180 degrees of phase to the unbalanced mass of the balance shaft module, and using the calculated rotational speed (RPM) Oil discharge amount of the pump). Here, the oil discharge amount of the oil pump can be reduced in proportion to the increase in the rotational speed RPM.

Therefore, the rotation speed of the engine is calculated using the crankshaft position sensor (CKP) signal input through the vibration reduction device, the phase of the balance shaft module is compensated according to the calculated rotation speed, and the oil discharge amount of the oil pump is controlled. By doing so, vibration of the vehicle engine can be effectively reduced.

Next, when the crankshaft position sensor (CKP) signal is input using the vibration reduction device having the above-described configuration, the signal is converted into a taco signal, and the taco signal is converted into a pulse signal to compensate for the rotation delay. After calculating the rotational speed (RPM) using a pulse signal, the process of compensating the phase of the balance shaft module using the calculated rotational speed and controlling the discharge amount of the oil pump will be described.

2 is a flowchart illustrating a process of reducing engine vibration by using a crankshaft position sensor signal according to another embodiment of the present invention.

Referring to FIG. 2, in the vibration control mode of the vibration reduction device (step 202), the crankshaft signal input unit 102 uses a crankshaft position sensor CKP that detects the position of the crankshaft. The position sensor (CKP) signal is input to the taco signal converter 104 (step 204).

When the variable inductance crankshaft position sensor signal is input through the crankshaft signal input unit 102, the taco signal converter 104 converts the crankshaft position sensor signal into a taco signal having a rotational speed. (Step 206). For example, as shown in FIG. 3, a variable inductance crankshaft position sensor signal (left signal) may be normalized and converted into a taco signal (right signal) in a rotational speed.

Next, the rotation delay compensator 106 compensates for the rotation delay by converting the missing teeth appearing discontinuously in the taco signal converted by the taco signal converter 104 into a seamless pulse type signal (step 208). .

In addition, the rotation speed calculating unit 108 calculates the rotation speed (RPM) of the engine according to the revolutions per minute using the pulse-shaped signal whose rotation delay is compensated by the rotation delay compensator 106 (step 210). .

In addition, the vibration control unit 110 monitors the generation of inertial force of the engine using the rotation speed RPM calculated through the rotation speed calculating unit 108, and accordingly adjusts the phase of the unbalanced mass of the balance shaft module by 180 degrees. Compensating to maintain and control the vibration of the balance shaft module (step 212).

In addition, the vibration control unit 110 controls the oil discharge amount of the oil pump (for example, variable oil pump, etc.) using the calculated rotational speed RPM (step 214). Here, the oil discharge amount of the oil pump can be reduced in proportion to the increase in the rotational speed (RPM).

Therefore, by using the crankshaft position sensor (CKP) signal to calculate the rotational speed of the engine, compensating for the phase of the balance shaft module according to the calculated rotational speed, by controlling the oil discharge amount of the oil pump, the vibration of the vehicle engine Can be effectively reduced.

In the foregoing description, various embodiments of the present invention have been described and described. However, the present invention is not necessarily limited thereto, and a person having ordinary skill in the art to which the present invention pertains can make various changes without departing from the technical spirit of the present invention. It will be readily appreciated that branch substitutions, modifications and variations are possible.

1 is a block diagram of a vibration reduction device suitable for reducing engine vibration using a crankshaft position sensor signal according to an embodiment of the present invention;

2 is a flowchart illustrating a process of reducing engine vibration using a crankshaft position sensor signal according to another embodiment of the present invention;

3 illustrates a crankshaft position sensor signal in accordance with an embodiment of the present invention.

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

102: crankshaft signal input unit 104: taco signal conversion unit

106: rotation delay compensation unit 108: rotation speed calculation unit

110: vibration control unit

Claims (10)

A crankshaft signal input unit to which a crankshaft position sensor (CKP) signal is input; A taco signal converter for converting the input crankshaft position sensor signal into a taco signal; A rotation delay compensator configured to compensate the rotation delay by converting the converted taco signal into a pulse signal; A rotational speed calculator configured to calculate an engine rotational speed using the converted pulse signal; A vibration control unit for controlling vibration of the balance shaft module using the calculated engine rotation speed and controlling oil discharge amount of the oil pump; Vibration reduction device. The method of claim 1, The taco signal converter is configured to convert the crankshaft position sensor signal having a variable inductance into the taco signal having a rotational speed. Vibration reduction device. The method of claim 2, The rotation delay compensator is configured to convert a missing tooth appearing discontinuously in the taco signal into a signal in the form of a pulse. Vibration reduction device. The method of claim 3, wherein The vibration control unit monitors the generation of inertial force of the engine by using the rotational speed, thereby compensating for maintaining the phase with respect to the unbalanced mass of the balance shaft module to maintain 180 degrees. Vibration reduction device. The method of claim 4, wherein The vibration control unit reduces the oil discharge amount in proportion to the increase in the rotation speed. Vibration reduction device. Inputting a crankshaft position sensor (CKP) signal, Converting the input crankshaft position sensor signal into a taco signal; Compensating for rotation delay by converting the converted taco signal into a pulse signal; Calculating an engine rotation speed by using the converted pulse signal; Controlling the vibration of the balance shaft module using the calculated engine rotation speed, and controlling the oil discharge amount of the oil pump. Vibration Reduction Method. The method of claim 6, The converting into the taco signal may include converting the crankshaft position sensor signal having a variable inductance form into the taco signal having a rotational speed form. Vibration Reduction Method. The method of claim 7, wherein Compensating the rotational delay may include converting a missing tooth appearing discontinuously in the taco signal into a signal in the form of a pulse. Vibration Reduction Method. The method of claim 8, The controlling the oil discharge amount may include monitoring the generation of inertia force of the engine by using the rotational speed, thereby compensating for maintaining the phase with respect to the unbalanced mass of the balance shaft module to maintain 180 degrees. Vibration Reduction Method. The method of claim 9, The controlling the oil discharge amount may include reducing the oil discharge amount in proportion to an increase in the rotation speed. Vibration Reduction Method.

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