KR101239265B1 - A control assembly including a vacuum pump and a control method for the vacuum pump - Google Patents

Abstract

The present invention relates to a control assembly including a vacuum pump and a control method of a vacuum pump, and more particularly, to a method and a control assembly for controlling the vacuum pump to be elastically operated according to an engine RPM.
The present invention for achieving this object is an engine RPM sensor for sensing the engine RPM; A vacuum pump for forming a vacuum pressure; And a control unit connected to the speed sensor and the vacuum pump to control an operation state of the vacuum pump according to the RPM of the engine detected by the speed sensor. To provide.

Description

A control assembly comprising a vacuum pump and a control method of the vacuum pump. {A control assembly including a vacuum pump and a control method for the vacuum pump}

The present invention relates to a control assembly including a vacuum pump and a control method of a vacuum pump, and more particularly, to a method and a control assembly for controlling the vacuum pump to be elastically operated according to an RPM of an engine.

The vehicle is provided with a vacuum pump for forming a vacuum pressure for use in a braking system or the like.

A normal vacuum pump is connected to a brake booster or a vacuum chamber to perform air extraction in the brake booster or the vacuum chamber.

The configuration of the vacuum pump for performing such a function includes a motor and a rotor connected to the motor to rotate at a high speed to form a low pressure state around the rotor to extract air from the brake booster or the vacuum chamber.

Therefore, when the air pressure of the pressure inside the brake booster or the vacuum chamber becomes higher than a predetermined reference, the motor rotates the rotor to draw the air inside the vacuum chamber or the brake booster to the outside so that the vacuum state can be maintained.

However, in the related art, the vacuum pump maintains a constant driving time or RPM regardless of the engine RPM.

However, the noise is generated by the operation of the vacuum pump. When the engine RPM is high, the operation sound of the vacuum pump may not be recognized well due to the noise caused by the vehicle running, but when the engine RPM is low, the noise caused by the vehicle driving This relatively low, the operation sound of the vacuum pump was highlighted, there was a problem that gives inconvenience to the vehicle occupants.

In addition, there is a problem that the pump is driven more than necessary in a state where the vehicle is relatively low speed, and there is also a problem that power is wasted.

The present invention is to provide an invention that can adjust the amount of noise according to the operation of the vacuum pump by changing the operating state of the vacuum pump in accordance with the engine RPM.

In addition, another object of the present invention is to provide an invention that can flexibly adjust the power consumption by changing the operating state of the vacuum pump according to the engine RPM.

The present invention having this purpose and the engine RPM sensor for detecting the engine RPM; A vacuum pump for forming a vacuum pressure; It is connected to the speed sensor and the vacuum pump provides a vacuum pump control assembly comprising a control unit for controlling the operation state of the vacuum pump in accordance with the engine RPM detected by the speed sensor.

Another embodiment of the present invention includes the steps of (a) detecting the engine RPM; (b) comparing the engine RPM with a predetermined standard; and (c) controlling the operating state of the vacuum pump to be changeable according to the comparison result.

The present invention having such an object can control the generation of noise due to the operation of the vacuum pump by changing the operating state of the vacuum pump in accordance with the engine RPM.

That is, when the engine RPM is relatively low, the driving speed or driving time of the motor used in the vacuum pump may be relatively smaller than the case where the engine RPM is high in order to reduce the influence of noise.

Therefore, when the vehicle is slower than when the vehicle is high speed, the influence of the noise of the vacuum pump can be reduced.

On the other hand, the driving speed of the vacuum motor is proportional to the input voltage. When a low driving speed is required, the input voltage is reduced, and when a high driving speed is required, the input power can be flexibly adjusted by flexibly operating by increasing the input voltage.

1 is a schematic diagram of a vehicle to which the present invention is applied.
2 is a perspective view of a vacuum pump according to the present invention.
3 is an exploded perspective view of a vacuum pump according to the present invention.
4 is a control block diagram of the present invention.
5 to 7 are control flow charts according to the present invention.
8 is a graph showing the relationship between the input voltage and noise in the present invention.
9 is a graph showing the relationship between the input voltage duty ratio and the arrival time for reaching a constant vacuum pressure in the present invention.

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

The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator.

Definitions of these terms should be based on the content of this specification.

In addition, the spirit of the present invention is not limited to the embodiments presented and those skilled in the art who understand the spirit of the present invention can easily implement other embodiments within the scope of the same idea, but this also falls within the scope of the present invention. Of course.

1 is a schematic diagram of a vehicle internal structure including the present invention.

The vehicle is provided with various driving elements, and a main controller unit 11 (MCU, hereinafter referred to as a controller) for controlling such driving elements is provided.

On the other hand, the control unit 11 is connected to the power supply unit 10 provided in the form of a battery, and controls the power supplied to each electrical appliance from the power supply unit 10.

The control unit 11 is provided with a vacuum pump 12, the role of the vacuum pump 12 is to be connected to a component that requires a vacuum to provide the vacuum pressure required by these components.

That is, air is sucked in from the housing of the brake booster 14 or the inside of the vacuum chamber 13 so that the pressure therein can be maintained in a vacuum state.

The function of the brake booster 14 serves to double the pressing force transmitted to the brake pedal 18 and deliver it to the master cylinder (not shown).

On the other hand, the vacuum chamber 13 serves to provide a vacuum pressure for the automation, exhaust gas recirculation or air conditioning.

The vacuum pump 12 includes a motor 12a and a rotor 12b connected by the motor 12a and the motor shaft 12c. When the motor 12a is driven, the rotor 12b rotates to take out air from the vacuum chamber or the brake booster.

The motor 12a, the motor shaft 12c, and the rotor 12b are accommodated in the vacuum pump housing 12d, and the vacuum pump housing 12d is piped to the vacuum chamber 13 or the brake booster 14. 20 is connected.

Between the vacuum chamber 13 or the brake booster 14 and the vacuum pump 12, the air is introduced only in one direction (the direction of the vacuum pump 12), the air is introduced in the opposite direction A check valve 25 for preventing is provided.

On the other hand, the pipe 20 is provided with a pressure sensor 30 that can measure the vacuum pressure of the vacuum chamber 13 or the brake booster (14).

35, which is not described, is an engine of a vehicle, and the engine 35 is connected to the control unit 11 to operate by a control command of the control unit 11. The engine 35 is also connected to a pipe 21 for transmitting a negative pressure formed in the engine.

The pipe 21 may be connected to the vacuum chamber 13 or the brake booster 14, and in this case, it is preferable to provide a vacuum pressure together with the pipe 20 connected to the vacuum pump 12. Do.

The pipe 21 is also provided with a pressure sensor 31 that can measure the vacuum pressure and a check valve 26 to allow the flow of air in only one direction.

An engine RPM sensor 37 for detecting an engine RPM is connected to the controller 11, and the engine RPM sensor 37 is connected to the engine 35 and the controller 11 by a signal line 41.

2 to 3 show the specific appearance of the vacuum pump 12.

The vacuum pump 12 includes a pump unit 100, a chamber unit 200 provided above the pump unit 100, and a motor unit 300 connected to the lower side of the pump unit 100. .

The pump unit 100 is made by a combination of the rotor 12b, the base plate 120 and the top plate 130.

The rotor 12b is installed inside the cam ring 102. The rotor 12b includes a rotor 12b-1 and vanes 12b-2 inserted into slots provided in the rotor 12b-1.

The cam ring 102 is provided with a heat dissipation projection 102a for dissipating heat generated when the rotor 12b is rotated.

The base plate 120 is provided below the cam ring 102.

The inlet 122 and the outlet 124 are spaced apart from each other on the base plate 120, and the upper plate 130 is disposed above the cam ring 102.

The chamber part 200 is configured to include an inner cap 210 and an outer cap 220.

The inner cap 210 covers an upper side of the upper plate 130, and the outer cap 220 covers an upper side of the inner cap 210 and is fixed to the motor unit 300.

The inner cap 210 and the outer cap 220 are installed in communication with each other in a state in which the motor cap 300 is installed.

That is, the air discharged to the inner cap 210 is installed to move to the outer cap 300.

The inner cap 210 and the outer cap 220 may be made of the same material or may be made of different materials.

When the inner cap 210 and the outer cap 220 are made of different materials, any one of plastic, aluminum, or stainless steel is used as the inner cap 210 or the outer cap 220.

Preferably, the inner cap 210 is made of aluminum, and the outer cap 220 is advantageous when using stainless steel in view of noise reduction.

Because the inner cap 210 uses aluminum with less vibration due to pressure fluctuations to attenuate high frequency noise, and the outer cap 220 is made of hard stainless steel with a hard characteristic to attenuate low frequency noise. It is because what is done is advantageous.

The inner cap 210 has an opening 212 at the center thereof, and the discharged air discharged from the outlet 124 is moved to the outer cap 220.

The openings 212 may have different diameters.

For example, when the upper diameter of the opening 212 is called d1 and the lower diameter is called d2, the diameter of d1 may be relatively larger than d2.

The inner cap 210 is provided with a through hole 214 in the flange 216 vertically bent outward of the inner cap 210 to be fixed to the upper surface of the motor unit 300.

The through hole 214 is configured to communicate with an exhaust hole (not shown) provided in the motor unit 300.

The inner cap 210 preferably has a separation distance spaced from an upper surface of the upper plate 130.

 The separation distance is formed by a space generated between the upper surface of the upper plate 130 and the inner side of the inner cap 210 in a state in which the inner cap 210 accommodates the upper surface of the upper plate 130.

No particular limitation is imposed on the separation distance.

In addition, the outer cap 220 preferably has a separation distance spaced from the outer side of the inner cap (210).

The lower surface of the pump unit 100 is provided with a packing member 400 for reducing the vibration generated while the pump unit 100 is operated, to prevent the leakage of high-pressure discharge air.

When the rotor 12b is installed in the motor unit 300, the packing member 400 is pressed by the rotor 12b and the pump unit 300 and compressed by 30% or more than the initial thickness. It is installed between the 12b and the motor unit 300.

As such, the packing member 400 plays a role of damping and a sealing at the lower side of the pump unit 100 at the same time.

The packing member 400 is provided with a packing hole 410 in communication with the suction port 122.

The motor 12a is installed inside the motor unit 100, and the motor 12a is prevented from being separated outward by a fixing cap provided at a lower side thereof. .

4 is a control block diagram showing a connection relationship between the main components of the present invention centering on the control unit 11.

The control unit 11 is connected to the power supply unit 10, the pressure sensor 30 for measuring the vacuum pressure and its change, and the engine RPM sensor 37 for measuring the engine RPM.

In addition, the vacuum pump 12 is connected to the control unit 11.

Specifically, when the motor 12a is driven under the control command of the controller 11, the rotor 12b connected to the motor 12a performs a rotational movement to perform air suction.

By the air suction action of the rotor 12b, a vacuum state can be formed inside the vacuum chamber (see Fig. 1, 13) or the brake booster (Fig. 1, 14).

Hereinafter, the control flow of the present invention will be described with reference to the accompanying drawings.

First, the flow of controlling the driving time of the motor according to the engine RPM will be described.

The vacuum pump according to the present invention checks whether there is an error (S501), and then recognizes the pressure value measured by the pressure sensor to determine whether the pressure inside the brake booster or the vacuum chamber is greater than or equal to the reference pressure. (S502).

If the reference pressure is less than the vacuum state is not damaged because it does not need to drive the vacuum pump, but if the reference pressure or more, the vacuum state is damaged because the vacuum pump should be operated.

When the vacuum pump operation is required in step S502, it is determined whether the engine RPM is greater than or equal to the reference RPM (eg, 200PRM) (S503).

As a result, when the engine RPM is greater than or equal to the reference RPM, the motor operates for the first set time (S504). If the engine RPM is less than or equal to the reference RPM, the motor operates for the second predetermined time (S505).

In this case, the first set time is preferably longer than the second set time, and in both cases, the rotational speed of the motor is preferably the same rpm.

For example, if the first preset time is 5 seconds, the second preset time may be 3 seconds.

If the engine RPM is high, the driving time needs to be longer because more vacuum pressure may be needed compared to the case of the relatively low engine RPM.

In addition, even when the motor is driven for a relatively long time during high RPM operation in the engine, because the noise of the motor may be less prominent by the noise generated by the high RPM operation of the engine, in the case of high RPM of the engine In this case, the operation time may be increased.

On the other hand, when the engine RPM is relatively low, the driving time of the motor is shortened, the time for the user to feel noise can also be shorter than in the prior art.

On the other hand, if the driving time of the motor is shortened, the input voltage can be reduced by that much, so that the use of power can be prevented from becoming higher than necessary.

After the motor operates for the first set time or the second set time, when the set time has elapsed, the motor is turned off and waits for a predetermined set waiting time (S506).

In FIG. 6, the flow of controlling the driving time of the motor according to the engine RPM will be described.

Also in this embodiment, it is checked whether there is an error with respect to the vacuum pump according to the present invention (S601), after which the pressure value measured by the pressure sensor is recognized whether the pressure inside the brake booster or the vacuum chamber is higher than the reference pressure. It is determined whether or not (S602).

When it is determined that the pressure is equal to or greater than the reference pressure, that is, when the vacuum pump operation is required, it is determined whether the engine RPM is equal to or greater than the reference RPM (S603).

As a result, when the engine RPM is higher than the reference RPM (eg, 2000 rpm), the motor operates at the first set speed (S604). If the engine RPM is lower than the reference RPM, the motor operates at the second set speed (S605). ).

For example, it is conceivable that the first set speed is set to 4500 rpm and the second set speed is set to 4000 rpm.

In this embodiment, only the set speed is different, and the motor is preferably driven for the same set time (S606).

When the engine RPM is high speed, more vacuum pressure may be required as compared to the low speed, so the elastic operation of the vacuum pump is possible according to the situation by adjusting the speed of the motor of the vacuum pump.

In addition, if the speed of the motor is small, the noise can be reduced by that much, so if the engine RPM is low speed can be reduced by the motor accordingly.

On the other hand, if the driving speed of the motor is lowered, the input voltage can be reduced by that, it is possible to prevent the power usage from being higher than necessary.

On the other hand, after the motor operates for the first set time or the second set time, when the set time has elapsed, the motor is turned off and waits for a predetermined set waiting time (S607).

8 is a graph showing a change in noise according to the duty ratio of the voltage applied to the motor.

Here, PWM (Pulse Width Modulation) described on the X axis is also called pulse width modulation, which is a method of controlling the speed or driving time of the motor by changing the ratio of on off.

The duty ratio means the ratio between on and off. The higher the number is, the more the on state and the higher the input voltage, the faster the motor can be driven.

For example, if a constant pulse is generated at a duty ratio of 60%, the motor recognizes the average value of the on time of the pulses, and the effect is as if the voltage is applied at 60%.

 If the duty ratio is 70%, the voltage is higher than 60% so that the motor can provide relatively high speed.

Therefore, the PWM duty ratio may be about 50 to 60% when the engine RPM is relatively low speed, and the PWM duty ratio may be about 80 to 90% when the engine RPM is relatively high speed.

 If the engine RPM is relatively low, the noise may be 66-78 dB, and if the engine RPM is relatively high, the noise may be 73-76 dB.

Therefore, when the engine RPM is low speed, relatively low dB noise may be generated than when the engine RPM is high speed.

On the other hand, even if the driving speed of the motor is the same according to the engine RPM, and the driving time is different, as described above, when the engine RPM is relatively low speed, the duration of the noise is shorter than the high speed to reduce the noise The influence by the speed can be adjusted.

7 shows a control flow for adjusting the driving speed of the motor and its driving time according to the engine RPM.

Also in the present embodiment, it is checked whether there is an error with respect to the vacuum pump according to the present invention (S701), and then recognizes the pressure value measured by the pressure sensor to determine whether the pressure inside the brake booster or the vacuum chamber is higher than the reference pressure. It is determined whether or not (S702).

When it is determined that the pressure is equal to or greater than the reference pressure, that is, when the vacuum pump operation is required, it is determined whether the engine RPM is equal to or greater than the reference RPM (S703).

If it is determined that the engine RPM is greater than or equal to the reference RPM, the motor operates for the formulation 1 set time at the first set speed (S704, S705). If the engine RPM is less than or equal to the reference RPM, the motor is set to the second set speed at the second set speed. The operation is performed for a time (S706, S707).

The first set speed is preferably higher than the second set speed, and the first set time is preferably shorter than the second set time.

For example, it can be considered that the first set speed is set to 4500 rpm, the second set speed is set to 4000 rpm, the first set time is 5 seconds, and the second set time is 6 seconds.

When the engine RPM is high speed, the set speed is relatively high, the set time is relatively short, and when the engine RPM is low, the set speed is relatively low, and the set time is relatively long, Because they are different.

That is, when the engine RPM is high speed or low speed, and the required vacuum degree is equal to -500mbar, the driving speed and driving time of the motor are different as follows.

As shown in Fig. 9, when the engine RPM is high, so that the maximum speed of the motor (Duty ratio is 100%) is required, the time required to achieve -500 mbar is 4.56 seconds.

If the engine RPM is low and a speed lower than the maximum speed of the motor (70% duty ratio is required), the time required is 6.32 seconds.

That is, when the engine RPM is low, the speed of the motor is lowered, and the noise may be reduced as the speed of the motor is lowered, but it means that it takes more time than the case of the high speed to satisfy the required vacuum degree.

On the other hand, after going through the steps S704 to S707, when the corresponding set time has elapsed, the motor stops and enters the standby state for the set waiting time (S708).

10: power supply unit 11: control unit
12: vacuum pump 12a: motor
12b: rotor 12c: axis of rotation
13: vacuum chamber 14: brake booster
30: pressure sensor 40: engine RPM sensor

Claims (10)

delete delete An engine RPM sensor for detecting engine RPM;
A vacuum pump for forming a vacuum pressure;
And a control unit connected to the engine RPM sensor and the vacuum pump to control an operation state of the vacuum pump according to the engine RPM detected by the engine RPM sensor.
The vacuum pump includes a rotor for sucking air to generate a vacuum pressure; A motor for rotating the rotor,
The controller controls the operating time of the motor to be the first set time when the engine RPM exceeds the reference RPM, and when the engine RPM is less than the reference RPM, the operating time of the motor is the first set time. And a second shorter set time. An engine RPM sensor for detecting engine RPM;
A vacuum pump for forming a vacuum pressure;
And a control unit connected to the engine RPM sensor and the vacuum pump to control an operation state of the vacuum pump according to the engine RPM detected by the engine RPM sensor.
The vacuum pump includes a rotor for sucking air to generate a vacuum pressure; A motor for rotating the rotor,
The controller controls the speed of the motor to be the first set speed when the engine RPM exceeds the reference RPM, and the speed of the motor is lower than the first set speed when the engine RPM becomes less than the reference RPM. The vacuum pump control assembly, characterized in that the control to the second set speed. An engine RPM sensor for detecting engine RPM;
A vacuum pump for forming a vacuum pressure;
And a control unit connected to the engine RPM sensor and the vacuum pump to control an operation state of the vacuum pump according to the engine RPM detected by the engine RPM sensor.
The vacuum pump includes a rotor for sucking air to generate a vacuum pressure; A motor for rotating the rotor,
When the engine RPM exceeds the reference RPM, the controller controls the operating time and speed of the motor to be a first set time and a first set speed, respectively,
When the engine RPM is less than the reference RPM, the operating time and the speed of the motor, respectively, characterized in that the control so that the second set time longer than the first set time and the second set speed lower than the first speed Vacuum pump control assembly. delete delete (a) detecting the engine RPM;
(b) comparing the engine RPM with a predetermined standard;
(c) controlling the operating state of the vacuum pump to be changeable according to the comparison result;
The vacuum pump includes a rotor for sucking air to generate a vacuum pressure; Including a motor for rotating the rotor,
The step (c)
When the RPM of the engine exceeds the reference RPM, the operating time of the motor is controlled to be the first set time, and when the RPM of the engine becomes less than the reference RPM, the operating time of the motor is greater than the first set time. The control method of the vacuum pump, characterized in that the step of controlling to become a short second set time. (a) detecting the engine RPM;
(b) comparing the engine RPM with a predetermined standard;
(c) controlling the operating state of the vacuum pump to be changeable according to the comparison result;
The vacuum pump includes a rotor for sucking air to generate a vacuum pressure; Including a motor for rotating the rotor,
The step (c)
When the RPM of the engine exceeds the reference RPM, the speed of the motor is controlled to be the first set speed, and if the RPM of the engine is less than the reference RPM RPM of the motor is lower than the first set speed The control method of a vacuum pump, characterized in that the step of controlling to become a set speed. (a) detecting the engine RPM;
(b) comparing the engine RPM with a predetermined standard;
(c) controlling the operating state of the vacuum pump to be changeable according to the comparison result;
The vacuum pump includes a rotor for sucking air to generate a vacuum pressure; Including a motor for rotating the rotor,
The step (c)
When the RPM of the engine exceeds the reference RPM, the operation time and speed of the motor are controlled to be the first set time and the first set speed, respectively,
When the RPM of the engine is equal to or less than the reference RPM, controlling the operation time and the speed of the motor so that the second set time longer than the first set time and the second set speed lower than the first set speed, respectively. Control method of a vacuum pump, characterized in that.

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