阅读说明：本技术 静电空气过滤装置、用于运行静电空气过滤装置的方法及具有静电空气过滤装置的机动车 (Electrostatic air filter device, method for operating an electrostatic air filter device, and motor vehicle having an electrostatic air filter device ) 是由 C·罗丝科普夫 于 2021-04-09 设计创作，主要内容包括：本发明涉及一种用于机动车(27)的静电空气过滤装置(1),包括至少一个用于产生电子的电离单元(2),其可被待净化空气流(3)穿流；下游的、用于产生电引力以使电子沉积的沉积单元(4)；内部温度测量装置(18),其设置在空气流通道(17)内部,借助该内部温度测量装置可确定内部温度；外部温度测量装置(19),其设置空气流通道(17)外部,借助该外部温度测量装置可确定外部温度；和控制单元(26),其适用于根据内部和外部温度之间的偏差至少将电离单元(2)激活和停用。本发明还涉及一种具有这种空气过滤装置(1)的机动车(27)以及一种用于运行这种空气过滤装置(1)的方法。(The invention relates to an electrostatic air filter device (1) for a motor vehicle (27), comprising at least one ionization unit (2) for generating electrons, through which an air flow (3) to be purified can flow; a downstream deposition unit (4) for generating an electrical attraction for depositing electrons; an internal temperature measuring device (18) which is arranged inside the air flow channel (17) and by means of which the internal temperature can be determined; an external temperature measuring device (19) which is arranged outside the air flow channel (17) and by means of which the external temperature can be determined; and a control unit (26) adapted to activate and deactivate at least the ionization unit (2) depending on the deviation between the internal and external temperatures. The invention further relates to a motor vehicle (27) having such an air filter device (1) and to a method for operating such an air filter device (1).)

1. Electrostatic air filter device (1) for a motor vehicle (27), comprising:

-at least one ionization unit (2) for generating electrons, which can be traversed by an air flow (3) to be purified;

-a deposition unit (4) arranged downstream of the ionization unit (2) for generating an electrical attraction by means of which electrons generated by the ionization unit (2) can be deposited on the deposition unit (4);

-an air flow channel (17) through which air flowing through the ionization unit (2) and the deposition unit (4) can flow;

-an internal temperature measuring device (18) arranged inside the air flow channel (17), by means of which the internal temperature can be determined;

-an external temperature measuring device (19) arranged outside the air flow channel (17), by means of which external temperature can be determined; and

-a control unit (26) adapted to activate and deactivate at least the ionization unit (2) as a function of the deviation between the internal and external temperatures.

2. An electrostatic air filter device (1) according to claim 1, wherein the first and second temperature measuring means (18, 19) are each a hot wire outputting a respective resistance value by means of which the temperature can be determined.

3. An electrostatic air filtration device (1) according to claim 2, wherein the control unit (26) is adapted to deactivate the ionization unit (2) and keep it deactivated when the internal and external temperatures differ from each other by no more than 5%.

4. An electrostatic air filtration device (1) according to claim 2 or 3, wherein the control unit (26) is adapted to activate the ionization unit (2) and keep it activated when the internal and external temperatures differ from each other by more than 5%.

5. An electrostatic air filtration device (1) according to claim 4, wherein the control unit (26) is adapted to set the power level of the ionization unit (2) such that the ionization unit (2) has a higher power when the deviation of the first and second temperature is larger than when the deviation is smaller.

6. An electrostatic air filtration device (1) according to any one of the preceding claims, wherein the internal and external temperature measuring devices (18, 19) are arranged inside a filter box (20) in which the ionization unit (2) and the deposition unit (4) are arranged.

7. An electrostatic air filtration device (1) according to any one of the preceding claims, wherein the external temperature measuring device (19) is provided in or on a frame (25) of an ionization unit (2).

8. Motor vehicle (27) having an electrostatic air filter device (1) according to one of claims 1 to 7.

9. Method for operating an electrostatic air filter device (1) of a motor vehicle (27), having at least one ionization unit (2) for generating electrons, through which an air flow (3) to be purified can flow; a deposition unit (4) arranged downstream of the ionization unit (2) for generating an electrical attraction by means of which electrons generated by the ionization unit (2) can be deposited on the deposition unit (4); the method comprises the following steps:

passing the air flowing through the ionization unit (2) and the deposition unit (4) through an air flow channel (17) of the electrostatic filter device (1);

determining the internal temperature by means of an internal temperature measuring device (18) inside the air flow channel (17);

the outside temperature is determined by means of an outside temperature measuring device (19) outside the air flow channel (17), and

at least the ionization unit (2) is activated and deactivated as a function of the deviation between the internal and external temperature.

10. Method according to claim 9, wherein the ionization cell (2) is deactivated and kept deactivated when the internal and external temperatures differ from each other by not more than 5%.

11. Method according to claim 9 or 10, wherein the ionization cell (2) is activated and kept activated when the internal and external temperatures differ from each other by more than 5%.

12. The method according to any one of claims 9 to 11, further comprising the step of:

the power level of the ionization unit (2) is set so that the power of the ionization unit (2) is higher when the deviation between the first temperature and the second temperature is large than when the deviation is small.

Technical Field

The invention relates to an electrostatic air filter device having an ionization unit and a deposition unit, to a method for operating an electrostatic air filter device, and to a motor vehicle having such an air filter device.

Background

Electrostatic filters for purifying air supplied to a vehicle interior space are known. An air cleaning device having a filter section which operates on the electrostatic principle is known, for example, from DE 69318712T 2.

In electrostatic filters, fine dust particles are charged by an electrostatic field and subsequently deposited in a vehicle deposition unit located downstream. An electrostatic field is generated by the electron tip. As the operating time increases, these tips show aging effects, which adversely affect the number of electrons produced.

Further prior art in the background art is known from US 2009/0126382 a1, WO 2017/010719 a1, DE 102016008366 a1 and US 2015/0328961 a 1.

Disclosure of Invention

The object of the invention is therefore to eliminate the above-mentioned disadvantages at least in part. This object is achieved by an electrostatic air filter device according to claim 1, a motor vehicle according to claim 8 and a method according to claim 9. Advantageous embodiments of the invention are the subject matter of the dependent claims.

According to one embodiment of the invention, an electrostatic air filter device for a motor vehicle is provided, comprising at least one ionization unit for generating electrons, through which an air flow to be purified can flow; a deposition unit disposed downstream of the ionization unit for generating an electrical attraction by which electrons generated by the ionization unit can be deposited on the deposition unit; an air flow channel through which air flowing through the ionization unit and the deposition unit can flow; an internal temperature measuring device which is arranged in the air flow channel and by means of which the internal temperature can be determined; an external temperature measuring device which is arranged outside the air flow channel and by means of which an external temperature can be determined; and a control unit adapted to activate and deactivate at least the ionization unit, in particular the ionization unit and the deposition unit, depending on a deviation between the internal and external temperatures. The advantages resulting therefrom are: the electrostatic filter, i.e. at least its ionization unit or its ionization unit and deposition unit, can only be used when the air conditioning system is operating in fresh air mode or partial fresh air mode. The air filtration device may be turned off in the circulating air mode. Thereby reducing the wear of the ionizing tip. Another advantage is that: by integrating the temperature measuring device into the filter device itself, the filter device may also be provided as a retrofit solution and does not necessarily need to be controlled from outside the air filter device (e.g. the vehicle's own climate control device). This means that no signal cables are required in the case of add-on or accessory solutions and that no vehicle software has to be prepared for the operation of the electrostatic air filter device.

According to a further embodiment of the invention, the first and second temperature measuring devices are in each case hot wires, which in each case output a resistance value, by means of which the temperature can be determined. By using hot wires, the invention can be implemented at low cost and with as little maintenance as possible.

According to another embodiment of the invention, the control unit is adapted to deactivate the ionization unit and keep it deactivated when the internal and external temperatures differ from each other by not more than 5%. Deviations of less than 5% should take into account measurement tolerances, measurement inertia and other deviations.

According to another embodiment of the invention, the control unit is adapted to activate the ionization unit and keep it activated when the internal and external temperatures differ from each other by more than 5%. The larger the deviation is, the more the fresh air mode or at least part of the fresh air mode is in the activated state. It makes sense to activate the air filter device in this fresh air mode.

According to another embodiment of the invention, the control unit is adapted to set the power level of the ionization unit such that the ionization unit has a higher power when the deviation of the first temperature and the second temperature is larger than when the deviation is smaller.

According to another embodiment of the invention, said internal and external temperature measuring means are arranged inside a filter box in which said ionization unit and deposition unit are arranged.

According to another embodiment of the invention, the external temperature measuring device is arranged in or on the frame of the ionization unit.

The invention further relates to a method for operating an electrostatic air filter device of a motor vehicle, having at least one ionization unit for generating electrons, through which an air flow to be purified can flow; a deposition unit disposed downstream of the ionization unit for generating an electrical attraction by which electrons generated by the ionization unit can be deposited on the deposition unit; the method comprises the following steps: flowing air through the ionization unit and the deposition unit through an air flow channel of the electrostatic filtration device; determining an internal temperature by means of an internal temperature measuring device within the air flow passage; the external temperature is determined by means of an external temperature measuring device outside the air flow channel, and at least the ionization unit, in particular the ionization unit and the deposition unit, are activated and deactivated as a function of the deviation between the internal and external temperatures. The same advantages as already described above in connection with the air filter device can be achieved by this method.

According to another embodiment of the method, the ionization cell is deactivated and kept deactivated when the internal and external temperatures differ from each other by not more than 5%.

According to another embodiment of the method, the ionization cell is activated and kept activated when the internal and external temperatures differ from each other by more than 5%.

According to another embodiment of the method, the method further comprises the steps of: the power level of the ionization unit is set such that the ionization unit has a higher power when the deviation of the first temperature and the second temperature is larger than when the deviation is smaller.

The invention further provides a motor vehicle having such an air filter device.

Drawings

Preferred embodiments of the present invention are explained below with reference to the drawings. The attached drawings are as follows:

fig. 1 schematically illustrates a side view of an electrostatic filtration device according to an embodiment of the invention;

fig. 2 schematically shows a more detailed side view of an electrostatic filter arrangement according to this embodiment of the invention;

FIG. 3 schematically illustrates a motor vehicle having an air filtration device according to the present disclosure; and

fig. 4 shows a schematic front view of an ionization unit of an air filter device according to the invention.

Detailed Description

Fig. 1 schematically shows an electrostatic filter device 1 with an ionization unit 2 which is traversed or can be traversed by an air stream 3 to be purified and generates electrons which attach to particles in the air stream 3. Downstream, a deposition unit 4 is provided, in which particles in the air flow 3 adhere to the deposition unit 4 on the basis of electrons adhering thereto.

Fig. 2 schematically shows the basic principle of the electrostatic filter device 1. The air stream 3 containing the particles 5 first flows through the ionization unit 2. The ionization unit 2 has a discharge plate 6 which in turn has a plurality of air passage openings 7 (for example circular) and webs 8 located therebetween. In addition, the ionization unit 2 has a pin plate 9, which in turn has pins 10, between which air passage openings 11 are formed. The tips 12 of the pins 10 extend towards the discharge plate 6 and/or into the air passage openings 7 and generate electrons which are electrically attracted by the positively charged discharge plate 6. More precisely, the electrons migrate from the tips 12 towards the edge of the air passage opening 7 of the discharge plate 6. Some electrons 13 adhere to the particles 5 flowing along the path 13 through the air passage openings 11, for example, on the way from the tips 12 to the discharge plate 6. These particles with attached electrons are provided with reference numeral 14 downstream of the ionization unit 2 and flow through the deposition unit 4 downstream of the ionization unit 2. The deposition unit has a negatively charged plate 15 and a positively charged plate 16. The particles 14 are attracted by the positively charged plates 16 during the flow through the deposition unit 4 on the basis of the electrons adhering thereto, are electrostatically bound and are thus retained in the deposition unit 4, to be precise on the plates 16 and adhere thereto. The deposition unit 4 can also be configured, for example, in the form of a positively charged screen filter or the like.

The air flow channel 17 corresponds to a channel of the filter device 1 through which air to be supplied to the vehicle interior space 23 (see fig. 3) can flow. This is here the air flow 3 within the air filter device 1, which also flows through the ionization unit 2 and the deposition unit 4. The air flow channel 17 thus comprises, for example, the channels of the ionization unit 2, the deposition unit 4 or the region between them.

In fig. 1 and 2 there is also provided an internal temperature measuring device 18, which is arranged inside the air flow channel 17. I.e. in the air flow 3 inside the filter device 1, this air flow also flows through the ionization unit 2 and the deposition unit 4. In addition, an external temperature measuring device 19 is provided, which is disposed outside the air flow channel 17. The two temperature measuring devices 18 and 19 are, for example, heating wires (hitzdry) which have a resistance which changes as a function of the temperature, so that the temperature occurring at the heating wire can be inferred from the resistance. Other known temperature measuring devices may be used instead of the hot wire.

Fig. 3 shows a filter tank 20 in which the filter device 1 is arranged. The filter box 20 has at least one fresh air flap 21, via which ambient air of the motor vehicle 27 can be supplied to the filter box 20. Furthermore, the filter box 20 has at least one circulating air flap 22, via which air introduced from the vehicle interior 23 can be supplied to the filter box 20. Finally, the filter box 20 has at least one outlet flap 24, via which the air filtered by the filter device 1 can be discharged into the vehicle interior 23. If the fresh air flap 21 is open and the recycled air flap 22 is closed, it is called fresh air mode. If the recirculation air flap 22 is open and the fresh air flap 21 is closed, this is called recirculation air mode. If both flaps are at least partially open, a hybrid operation is called.

Fig. 4 shows a schematic front view of the ionization unit 2 of the filter device 1 in the viewing direction of the air flow 3 (see fig. 2). The tips 12 (only some of which have reference numerals) are visible surrounded by an ionization frame 25. The internal temperature measuring device 18, for example in the form of a hot wire, extends from one end of the ionization frame 25 to the opposite end of the ionization frame 25 in such a way that the internal temperature measuring device 18 is located in the air flow channel 17. The interior of the ionization frame 25 here defines a section of the air flow channel 17. An external temperature measuring device 19, for example in the form of a hot wire, is arranged outside the air flow channel 17. For example, the external temperature measuring device 19 is arranged in the plane of the ionization frame 25. The temperature measuring device 19 can be arranged outside the ionization frame 25 or can be integrated into the ionization frame 25 or fixed thereto.

Furthermore, a control device 26 is shown, which is connected to the temperature measuring devices 18, 19 in order to receive the measured values of the temperature measuring devices 18, 19. In particular, the control device 26 may be adapted to measure the resistance values of the temperature measuring devices 18, 19 and to determine the internal and external temperatures therefrom. In addition, the control device 26 is connected at least to the ionization unit 2, and in particular to the ionization unit 2 and to the deposition unit 4, in order to activate them (and keep them activated) and deactivate them (and keep them deactivated).

The air filter device 1 operates as follows:

a circulating air mode is detected by the air filter device 1 on the basis of the internal temperature being substantially the same as the external temperature, in which the fresh air flap 21 is closed and the circulating air flap 22 is open. In the case of using the hot wire, the hot wire of the internal temperature measuring device has the same resistance as that of the hot wire of the external temperature measuring device. In this circulating air mode, the air filter device 1, in particular the ionization unit 2, is switched off. The air filter device 1 is turned off when the inside and outside temperatures differ from each other by not more than 5% in consideration of measurement error, measurement inertia, and the like.

A fresh air mode in which the fresh air flap 21 is open and the circulating air flap 22 is closed is detected by the air filter device 1 on the basis of a temperature at the internal temperature measuring device 18, i.e. an internal temperature, which is lower than a temperature at the external temperature measuring device 19, i.e. an external temperature. In the case of using the hot wire, the hot wire of the internal temperature measuring device 18 has a low resistance compared to the hot wire of the external temperature measuring device 19. In the fresh air mode, the air filter device 1, in particular the ionization unit 2, is switched on.

A mixing operation is detected by the air filter device 1 on the basis of the temperature at the internal temperature measuring device 18 being lower than the temperature at the external temperature measuring device 19, in which mixing operation the fresh air flap 21 is at least partially open and the recirculated air flap 22 is at least partially open. But here the deviation between the internal and external temperature is smaller than in the fresh air mode. In the case of using the hot wire, the hot wire of the internal temperature measuring device 18 has a lower resistance than that of the hot wire of the external temperature measuring device 19, but the deviation of the resistance value is smaller than that in the fresh air mode. In this hybrid operation, the air filter device 1, in particular the ionization unit 2, is switched on, but its power level is lower than in the fresh air mode.

An automatically adjusting air filter device is thus obtained, which is adjusted independently of the vehicle architecture.

While the invention has been illustrated and described in detail in the drawings and foregoing description, the description is to be considered illustrative or exemplary and not restrictive in character and is not intended to limit the invention to the disclosed embodiments. The mere fact that certain features are recited in mutually different dependent claims does not indicate that a combination of these features cannot be used to advantage.