KR20110072864A - Method for controlling vehicle vacuum pump and the vacuum pump - Google Patents

Abstract

PURPOSE: A control method of vacuum pump for vehicle and vacuum pump using the same are provided to stably supply vacuum to a vehicle by keeping the vacuum pressure of a brake buster within a safe range. CONSTITUTION: A vacuum pump comprises a pump unit(100), a motor unit(200), and a control unit. The pump unit produces vacuum. The motor unit is combined with the pump unit and supplies the driving force to the pump unit. The control unit is combined with the motor unit and includes a pressure sensor. The control unit comprises a main printed circuit board(301), a temperature sensor, a converter, and a communications module. The temperature sensor senses the temperature of the main printed circuit board. The converter converts the power source, from a battery, into the power which can be supplied to the main printed circuit board.

Description

Method for controlling vehicle vacuum pump and vacuum pump using same

The present invention relates to a vehicle vacuum pump installed in a vehicle for supplying a vacuum and a vacuum pump using the same.

In general, the vacuum pump installed in the vehicle generates a vacuum by rotating the rotor, discharges the compressed air to the outside of the vacuum pump, and serves to supply the vacuum pressure necessary for braking the vehicle.

The vacuum pump is a device for braking the vehicle by supplying a vacuum pressure through the brake line while the rotor and vanes provided therein are rotated when the driver operates the brake pedal.

The vacuum pump is classified into a mechanical type coupled to a cam shaft provided in the engine and an electronic type having a self-driven source. In recent years, the electronic vacuum pump has been continuously developed in technology.

In addition, efforts have been made to develop the vacuum pump in various ways to supply a more stable vacuum pressure.

It is an object of the present invention to provide a vacuum pump for a vehicle in which a controller is integrally packaged in a vacuum pump.

An object of the present invention is to provide a vehicle vacuum pump that is easy to control the vacuum pump while minimizing the installation area of the vacuum pump installed in the engine room.

An object of the present invention is to provide a control method of a vacuum pump for a vehicle that can stably supply a vacuum to the vehicle by maintaining the vacuum pressure inside the brake booster within a stable range.

An object of the present invention is to provide a control method of a vacuum pump that can stably handle various errors generated during the operation of the vacuum pump.

In order to achieve the above object, a control method of a vehicle vacuum pump according to the present invention includes: a vacuum pressure sensing step of sensing a vacuum pressure inside a brake booster according to whether an engine installed in a vehicle is present; A vacuum pump control step of controlling an operation state of the vacuum pump according to the vacuum state of the brake booster; And an error control step of checking whether there is an abnormality of the vacuum pump and controlling an operating state of the vacuum pump according to the abnormality.

The vacuum pressure detecting step includes: a first vacuum pressure determining step of determining a vacuum pressure inside the brake booster when the engine is started off; The engine is configured to further include a second vacuum pressure determination step of determining a vacuum pressure inside the brake booster when the engine is in an on state.

The first vacuum pressure determining step may determine whether the vacuum pressure inside the brake booster corresponds to the first pressure.

The first pressure is characterized in that the vacuum pressure inside the brake booster is -400mmHg or less.

The second vacuum pressure determining step may determine whether the pressure inside the brake booster corresponds to the second pressure.

The second pressure is characterized in that the vacuum pressure inside the brake booster is -600mmHg or more.

The vacuum pump control step includes a second control step in which the vacuum pump is further operated to increase the vacuum pressure inside the brake booster when the vacuum pressure inside the brake booster corresponds to the second pressure.

In the second control step, the vacuum pump is further operated for t seconds and then stopped.

The vacuum pump control step is characterized in that the current is applied linearly with the passage of time when the vacuum pump is driven in the stationary state, or stopped in the driving state.

The error control step includes a first error control step of performing control on an error generated while maintaining starting of the vacuum pump; And a second error control step of controlling the start of the vacuum pump by the generated error.

The first error control step may include: a temperature control step of maintaining the operation of the motor for t seconds and stopping when the temperature of the main PCB provided in the vacuum pump is increased by exceeding the preset time limit and the limit temperature; When a voltage is applied to the main PCB outside the permissible voltage range with a preset time limit, the motor operation comprises a voltage control step of holding and stopping for t seconds.

The second error control step includes an overcurrent control step of stopping the operation of the vacuum pump when a current is applied to the main PCB provided in the vacuum pump in excess of the preset limit time and the limit current value.

Vacuum pump according to the present invention comprises a pump unit for generating a vacuum; A motor unit coupled to the pump unit and providing a driving force to the pump unit; And a control unit coupled to the motor unit and equipped with a pressure sensor.

The control unit includes a main PCB; A temperature sensor for sensing a temperature of the main PCB; A converter for converting the power applied from the battery into a power supply capable of supplying the main PCB; A communication module for performing communication between the vehicle vehicle control module provided in the vehicle and the main PCB; And a PWM (Pulse Width Modulation) control module for controlling the rotation state of the motor mounted in the motor unit.

The communication module uses a communication method of at least one of Bluetooth, Zigbee, CAN, and RFID.

The control unit is characterized in that when the main PCB is overheated, the motor is maintained for t seconds to stop.

As described above, the method of controlling the vacuum pump for a vehicle and the vacuum pump using the same according to the present invention are easy to control, responsiveness improves and maintains a minimal layout during vehicle installation since the main PCB is integrated with the vacuum pump. It works.

In addition, there is an effect that a stable vacuum is supplied according to the operation of the vacuum pump, and effective response is promptly made according to various errors.

Hereinafter, with reference to the accompanying drawings, a control method of a vehicle vacuum pump and an embodiment of a vacuum pump using the same according to the present invention will be described with reference to the drawings.

1 is a flowchart illustrating a control method of a vehicle vacuum pump according to the present invention, FIG. 2 is a view illustrating a configuration of a vehicle vacuum pump according to the present invention, and FIG. 3 is a view illustrating a vehicle vacuum pump according to the present invention. 4 is a flowchart illustrating an operating state according to the control method, FIG. 4 is a flowchart illustrating an operating state according to an error occurrence in the control method of the vehicle vacuum pump according to the present invention, and FIG. 5 is provided in the vehicle vacuum pump according to the present invention. Figure 6 is a graph showing the change in the vacuum pressure of the brake booster, Figure 6 is a graph showing the state of the current applied over time in the motor provided in the vehicle vacuum pump according to the present invention, Figure 7 is a vehicle for the vehicle according to the present invention An exploded perspective view of a vacuum pump.

Vacuum pump 1 according to the present invention comprises a pump unit 100, the motor unit 200 and the control unit 300. In particular, the control unit 300 is the main PCB 301 is built in the pressure sensor 310 is fixed to the inside of the cap 400, it is integrally coupled with the motor unit 200.

The pump unit 100 is provided with a rotor (not shown) and vanes (not shown _) to generate a vacuum. The vanes are coupled to the rotor at equal intervals, and the rotor rotates to pump external air. It is sucked into the unit 100.

The motor unit 200 is provided with a motor 201 therein, the inlet is provided so that air flows into the pump unit 100 outside the motor unit 200.

A damping rubber (not shown) is provided below the motor unit 200 to reduce vibration of the motor 201, and a cap 400 coupled to the motor unit 200 is provided below the damping rubber. It is provided.

The cap 400 is provided with a seating portion so that the main PCB 301 is seated and installed, thereby achieving stable seating of the main PCB 301.

The control unit 300 is provided with a temperature sensor 302 for sensing the temperature of the main PCB 301, and a converter 303 for converting into a power source that can be supplied to the main PCB 301.

The converter 303 uses a DC / DC converter.

In addition, a communication module 304 for communicating between a vehicle control module (not shown) provided in the vehicle and the main PCB 301 is provided. The communication module 304 includes a Bluetooth, a Zigbee, a CAN, and a CAN. It is made to use at least one communication scheme of radio recognition (RFID).

When the main PCB 300 according to the present invention rises above a predetermined temperature, the motor 201 is maintained for t seconds and stopped, thereby controlling itself to prevent the main PCB 301 from being burned out. .

The vacuum pump having such a configuration is controlled by the following control method.

A vacuum pressure detecting step (ST100) of detecting a vacuum pressure inside the brake booster according to whether the engine provided in the vehicle is started; A vacuum pump control step of controlling an operating state of the vacuum pump according to the vacuum state of the brake booster (ST200); And an error control step (ST300) of checking whether there is an abnormality of the vacuum pump and controlling an operating state of the vacuum pump according to the abnormality.

The vacuum pressure detecting step ST100 may include a first vacuum pressure determining step ST110 that determines a vacuum pressure inside the brake booster when the engine is started off; The engine may further include a second vacuum pressure determination step ST120 for determining a vacuum pressure inside the brake booster when the engine is in an on state.

The first vacuum pressure determination step ST110 determines whether the vacuum pressure inside the brake booster corresponds to the first pressure. The first pressure is characterized in that the vacuum pressure inside the brake booster is -400mmHg or less.

If the vacuum pressure falls below -400mmHg, the vacuum pressure inside the brake booster will be around -300mmHg, which is relatively less than -400mmHg. As described above, even when the driver applies pressure to the brake pedal in a state where the vacuum pressure inside the brake booster is low, braking is not performed due to insufficient vacuum pressure.

The second vacuum pressure determination step ST120 determines whether the pressure inside the brake booster corresponds to the second pressure. The second pressure is characterized in that the vacuum pressure inside the brake booster is -600mmHg or more.

When the vacuum pressure is -600 mmHg or more, the vacuum pressure inside the brake booster has a vacuum pressure of -700 mmHg or more, which is relatively higher than -600 mmHg.

As described above, when the driver applies pressure to the brake pedal in a state where the vacuum pressure inside the brake booster is sufficient, braking of the vehicle is performed stably, and braking is performed even when the brake pedal is repeatedly illuminated.

The vacuum pump control step ST200 may include a second control step ST220 in which the vacuum pump is further operated to increase the vacuum pressure inside the brake booster when the vacuum pressure inside the brake booster corresponds to the second pressure. It is configured by.

In the second control step ST220, the vacuum pump is further operated for t seconds and then stopped.

If the vacuum pressure inside the brake booster corresponds to the second vacuum pressure, since the driver may repeatedly operate the brake pedal under the current vacuum pressure, it is preferable that the vacuum pump is additionally operated for stable braking. Do.

In the vacuum pump control step ST200, when the vacuum pump is driven in the stopped state or stopped in the driven state, current is linearly applied to the motor as time passes.

Because, when the vacuum pump is driven in a stationary state, if a current is applied in a non-linear state, it causes damage to the motor 201, it is preferable to perform a stable operation of the motor by applying a current linearly over time Do.

In addition, even when the vacuum pump is stopped, the current is applied in a linear state while the current decreases with time, so that the motor stops stable.

In the vacuum pump according to the present invention, the current is linearly applied when the motor starts and stops, and when the motor shaft of the motor is rotated for the first time, 100% of the current is applied to the vacuum pump. It turns out that there is also a way to drive the vacuum pump while is applied.

The error control step (ST300) includes a first error control step (ST310) for controlling the generated error while maintaining the start of the vacuum pump; When the start of the vacuum pump is stopped by the generated error, it comprises a second error control step (ST320) for controlling this.

In the first error control step ST310, when the temperature of the main PCB included in the vacuum pump is increased by exceeding the preset limit time and the limit temperature, the operation of the motor is maintained for t seconds and then stopped (ST312). Wow; When a voltage is applied to the main PCB outside the allowable voltage range with a preset time limit, the operation of the motor is configured to include a voltage control step (ST314) for holding and stopping for t seconds.

The second error control step ST320 includes an overcurrent control step ST322 that stops the operation of the vacuum pump when a current is applied to the main PCB provided in the vacuum pump by exceeding a preset limit time and a limit current value. It is configured to include.

The control method of the vacuum pump and the operating state of the vacuum pump using the same according to the present invention configured as described above will be described with reference to the drawings.

1 to 3, the pressure sensor 310 detects the vacuum pressure of the brake booster in the off state before the engine is started on in the state where the driver is in the vehicle. The transfer to the PCB 301 (ST100).

The main PCB 310 analyzes the signal transmitted through the pressure sensor 310 and determines the vacuum pressure of the brake booster when the engine is turned off, and whether the vacuum pressure of the brake booster is -400 mmHg or less. It is determined whether or not (ST110).

Here, the vacuum pressure reference inside the brake booster is divided into -400mmHg or less and -600mmHg or more as described above.

Referring to FIG. 5, the range in which the brake booster has an internal vacuum of -400 mmHg or less means a range of -300 mmHg to -200 mmHg.

 If the vacuum pressure inside the brake booster is less than -400mmHg, it means that the vacuum pressure inside the brake booster is insufficient. If the vacuum pressure inside the brake booster is more than -600mmHg, it means that the vacuum pressure inside the brake booster is not sufficient, but additionally needs to be supplemented. do.

Since the section between -300mmHg and -100mmHg corresponding to -400mmHg or less is a pressure range approaching normal atmospheric pressure, the main PCB 301 does not execute a separate operation command to the vacuum pump 1 when the engine is turned off. Do not.

If the engine is turned on (ST20), the vehicle may start soon, so the motor 201 of the vacuum pump 1 is unconditionally operated to increase the vacuum pressure inside the brake booster. ST22).

The vacuum pump 1 is controlled by the main PCB 301 to compensate for the insufficient vacuum pressure inside the brake booster.

If the engine is on, it is controlled by the main PCB as follows.

As the engine is operated, the pressure sensor 310 detects a pressure state inside the brake booster and transmits the pressure to the main PCB 301, and the main PCB 301 has a current pressure when the engine is started on. It is determined whether the state is a pressure state of the first to second pressure (ST210).

The main PCB 301 applies the operation signal to the motor 201 when the pressure state sensed by the pressure sensor 310 is the first pressure (-400 mmHg or less), thereby unconditionally operating the vacuum pump 1 (ST210). )

If the vacuum pressure inside the brake booster is not the first pressure range but falls within the second pressure range (ST120) (-600 mmHg or more), the driver is expected to repeatedly use the brake while driving the vehicle, and the motor ( The operation signal is applied to 201 to drive the vacuum pump 1 for t seconds (ST220).

The driving time of the vacuum pump 1 may be set to be driven for 5 seconds or more, but this may be varied, and preferably maintained at a pressure of at least -800 mmHg (ST30). This is because a pressure state of -800 mmHg or more is a state in which a vacuum pressure of at least -850 mmHg to 950 mmHg or more is maintained. In this state, even if some pressure is consumed for brake braking, the vehicle can be run without deficiency.

When the pressure inside the brake booster reaches the stable pressure range as described above, the main PCB 301 stops the operation of the motor 201 and turns off the entire operation of the vacuum pump 1 (ST40).

The main PCB 301 receives the pressure in real time with respect to the internal pressure of the brake booster through the pressure sensor 310, controls the operation of the vacuum pump 1 on and off, and repeats the above-described method for a long time of the vehicle. Carry out control according to the driving.

When the vehicle is parked by the driver and the engine is turned off (ST50), further operation of the vacuum pump 1 is stopped by the main PCB 301.

The main PCB controls the motor as follows when starting the vacuum pump in the stopped state.

6 to 7, the motor 201 included in the vacuum pump 1 controls the current to be linearly applied when the operating state is changed from the stationary state to the rotating state. do.

That is, as the main PCB 301 is driven, the motor 201 is driven through the battery and the converter 303 so that a current is applied to the motor 201 linearly in proportion to the passage of time t. Adjust the amount of current applied to the

This is because, when the motor 201 is stopped and suddenly operated, it may cause burnout of the motor 201. Therefore, the current is proportional to time without applying all the currents applicable to the motor 201 at once. Control to be applied.

The main PCB 301 linearly reduces the amount of current applied to the motor 201 even when the motor is stopped, as shown in the figure, to prevent burnout of the motor 201.

The control state according to the occurrence of an error in the vacuum pump according to the present invention will be described.

Referring to FIG. 4, when an error occurs in the state in which the vacuum pump is operated (ST60) (ST70), the main PCB 301 determines whether or not to start the vacuum pump 1 (ST300).

For example, when it is desired to control the generated error while maintaining the start of the vacuum pump 1 (ST310), error control is performed through the main PCB as follows.

When the temperature of the main PCB 301 is increased while the vacuum pump 1 is operated (ST312), the main PCB 301 controls to maintain the operation of the motor 201 for t seconds (ST80).

Since the main PCB 301 is provided with a plurality of electronic devices (not shown), the main PCB 301 may be sensitive to temperature and malfunction in a high temperature state.

The limit temperature of the main PCB 301 is set at 150 ° C., and when the temperature is maintained at the high temperature for 1 minute or more, cooling is performed while maintaining the start of the vacuum pump 1.

The cooling of the main PCB 301 radiates heat to the outside, or cools the main PCB 301 by introducing external air.

When the vacuum pump 1 is operated and an abnormal voltage is applied to the main PCB 301 via the converter 303 (ST80), the state of the voltage currently applied to the main PCB 301 is detected.

For example, when a voltage of 16 V or more is applied to the main PCB 301 or a voltage of 9 V or less is applied, the main PCB 301 recognizes that a voltage error occurs, and the main PCB 301 operates for t seconds. Control to hold while stopping (ST314).

The motor 201 provided in the vacuum pump 1 is set in the main PCB 301 to operate in a voltage range of 9V to 16V, and is controlled as described above when it is out of the above voltage range. Both of the above start of the vacuum pump 1 is maintained (ST80).

An example in which a current error occurs in the main PCB according to the present invention will be described.

The main PCB 301 continuously checks the state of the current input to the main PCB 301 via the converter 303, and when a current exceeding the safety allowable current value 20A is applied (ST322), While waiting for t seconds, the driving state of the motor 201 is controlled.

For example, when a current of 20A or more is applied to the main PCB 301 for 4 seconds or more, various devices mounted on the main PCB 301 by immediately blocking the overcurrent applied to the main PCB 301 and the motor 201. And burning of the motor 201 is prevented (ST90).

The main PCB 301 communicates with the vehicle control module provided in the vehicle about the operating state of the vacuum pump 1 and whether or not an error occurs in real time through the communication module 304, and the self-control module is a vacuum pump ( The operation status and abnormality occurrence of 1) can be checked stably.

The communication module 304 may selectively use any one of Bluetooth, Zigbee, CAN, and RFID.

The motor 201 mounted in the motor unit 200 is additionally controlled by the PWM (Pulse Width Modulation) control module.

In the embodiment of the present invention, the occurrence of the error has been described as three variables by voltage, current, and temperature, and it is apparent that an error (vibration) to other variables also exists.

The main PCB 301 is provided with a plurality of field effect transistors (hereinafter referred to as FETs). In addition to the operation of the vacuum pump 1, heat is generated at a high temperature. The FET is provided with a separate heat dissipation pad for dissipating heat when heat is generated to dissipate high temperature heat generated by the FET.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the scope of the appended claims. It will be understood by those skilled in the art that various modifications may be made and equivalents may be resorted to without departing from the scope of the appended claims.

1 is a flow chart illustrating a control method of a vehicle vacuum pump according to the present invention.

2 is a view showing the configuration of a vehicle vacuum pump according to the present invention.

Figure 3 is a flow chart showing an operating state by the control method of the vehicle vacuum pump according to the present invention.

Figure 4 is a flow chart showing an operating state according to the occurrence of errors in the control method of a vehicle vacuum pump according to the present invention.

Figure 5 is a graph showing the change in the vacuum pressure of the brake booster provided in the vehicle vacuum pump according to the present invention

Figure 6 is a graph showing the state of the current applied over time in the motor provided in the vehicle vacuum pump according to the present invention.

Figure 7 is an exploded perspective view showing a vehicle vacuum pump according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: vacuum pump 100: pump unit

200: motor unit 201: motor

300: control unit 301: main PCB

302: temperature sensor 303: converter

304: communication module 305: PWM

310: pressure sensor

Claims (17)

A vacuum pressure sensing step of sensing a vacuum pressure inside the brake booster according to whether the engine provided in the vehicle is started; A vacuum pump control step of controlling an operation state of the vacuum pump according to the vacuum state of the brake booster; And And an error control step of checking an abnormality of the vacuum pump and controlling an operation state of the vacuum pump according to the abnormality. The method according to claim 1, The vacuum pressure sensing step A first vacuum pressure determining step of determining a vacuum pressure inside the brake booster when the engine is in an off state; And a second vacuum pressure determination step of determining a vacuum pressure inside the brake booster when the engine is in an on state. The method of claim 2, The first vacuum pressure determination step And determining whether the vacuum pressure inside the brake booster corresponds to the first pressure. The method of claim 3, wherein The first pressure is A control method of a vehicle vacuum pump, wherein the vacuum pressure inside the brake booster is -400 mmHg or less. The method of claim 2, The second vacuum pressure determination step And determining whether the pressure inside the brake booster corresponds to the first pressure or the second pressure. 6. The method of claim 5, The second pressure is The control method of the vehicle vacuum pump, characterized in that the vacuum pressure inside the brake booster is -600mmHg or more. The method according to any one of claims 1 to 3, The vacuum pump control step And a first control step of unconditionally turning on the vacuum pump when the vacuum pressure inside the brake booster corresponds to the first pressure in a state where the starting is on. How to control the pump. The method according to any one of claims 1 to 5, The vacuum pump control step And if the vacuum pressure inside the brake booster corresponds to the second pressure, the vacuum pump is further operated to increase the vacuum pressure inside the brake booster. Way. The method of claim 8, The second control step is a control method of a vehicle vacuum pump, characterized in that the vacuum pump is further operated for t seconds, and stopped. The method according to claim 1, The vacuum pump control step Control method of a vacuum pump for a vehicle, characterized in that the current is applied linearly with the passage of time when the vacuum pump is driven in the stationary state, or stopped in the driving state. The method according to claim 1, The error control step A first error control step of performing control on the generated error while maintaining the start of the vacuum pump; And a second error control step of controlling when the start of the vacuum pump is stopped by the generated error. 12. The method of claim 11, The first error control step A temperature control step of maintaining the operation of the motor for t seconds and stopping when the temperature of the main PCB provided in the vacuum pump is increased by exceeding the preset limit time and the limit temperature; When the voltage is applied to the main PCB out of the allowable voltage range with a predetermined limit time, the operation of the motor comprising a voltage control step of maintaining and stopping for t seconds. 12. The method of claim 11, The second error control step The over-current control step of stopping the operation of the vacuum pump when the current is applied to the main PCB provided in the vacuum pump exceeding a predetermined limit time and the limit current value of the vehicle vacuum pump Control method. A pump unit for generating a vacuum; A motor unit coupled to the pump unit and providing a driving force to the pump unit; And Coupled with the motor unit, the vehicle vacuum pump comprising a control unit mounted with a pressure sensor. 15. The method of claim 14, The control unit Main PCB; A temperature sensor for sensing a temperature of the main PCB; A converter for converting the power applied from the battery into a power supply capable of supplying the main PCB; A communication module for performing communication between the vehicle vehicle control module provided in the vehicle and the main PCB; And Vehicle vacuum pump comprising a PWM (Pulse Width Modulation) control module for controlling the rotation state of the motor mounted on the motor unit. 15. The method of claim 14, The communication module Vehicle vacuum pump, characterized in that using at least one of the communication scheme of Bluetooth, ZigBee, CAN and radio recognition (RFID). 15. The method of claim 14, The control unit When the main PCB is overheated, the vehicle vacuum pump, characterized in that to maintain the start of the motor for t seconds to stop.

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