WO2009033923A2

WO2009033923A2 - Sensor arrangement on a filter having a self-sufficient energy supply

Info

Publication number: WO2009033923A2
Application number: PCT/EP2008/060897
Authority: WO
Inventors: Sascha Bauer; Peter Müller; Markus Beylich
Original assignee: Mann+Hummel Gmbh
Priority date: 2007-09-12
Filing date: 2008-08-20
Publication date: 2009-03-19
Also published as: WO2009033923A3

Abstract

The invention relates to a sensor arrangement (6) on a filter (1) having the following characteristics: sensor elements (9) are provided for detecting the pressure of a medium to be filtered on at least one inflow or outflow side of a filter element (2), and/or sensor elements (10) are provided for detecting the temperature of the medium to be filtered on an inflow or outflow side of the filter element (2), an energy converter (7) is provided for producing electric energy for the sensor arrangement (6) from the medium to be filtered, or from the environment of the filter (1), an energy management component (8) is provided for controlling the energy supply of the sensor arrangement (6), and a signal processing component (11) is provided as part of the sensor arrangement (6), by means of which the signals of the sensor elements can be pre-processed and wirelessly transmitted to a receiver (13) via a transmission module (12).

Description

description

TECHNICAL FIELD The invention relates to a sensor arrangement on a filter with self-sufficient

Energy supply, in particular in air filters in a motor vehicle,

according to the preamble of the main claim.

State of the art

It is known that to monitor the function of a Luftfil¬

Sensors are mounted in a motor vehicle, the insbesonde¬

re the differential pressure between the upstream side and the downstream side

measure the filter element and thus a possible overload of Fil¬

Can display terelements with dirt particles. Such a measurement

is preprocessed by means of suitable electronics and then in vor¬

Give intervals to a receiver, for example, the on-board computer

of the motor vehicle, transmitted and further processed there. The transmis

Such measurement data is usually provided via a cable connection

which also provides the energy supply.

From DE 103 44 553 A1 discloses a sensor arrangement is known in which the

Determination of the flow velocity and the temperature of the air in

an air duct for a motor vehicle ventilation system a thermogenera-

Tor exists due to a temperature difference between

Areas of the interior air of the motor vehicle generates electrical energy,

which are used to operate the electronics of the sensor arrangement

ml that can. In this self-sufficient energy production, it is advantageous

possible that, for example, a radio transmission of the sensor data for

On-board computer or to an on-board data network without a wiring

can be carried out.

Furthermore, it is known from DE 101 47 720 A1 that the self-sufficient Versor¬

tion of sensors in a motor vehicle with electrical energy an In¬

production system is present, the already existing mechanical

Vibrations with a mechanical vibration system exploits on

Inductive way to generate electrical energy.

A comparable system is also known from EP 1 312 171 B1, at

which is also an electromechanical converter, here a piezoceramic

shear bending transducer, is present, which has a downstream

Rectifier and a voltage converter supplies a logic board.

Disclosure of the invention

The invention relates to a sensor arrangement on a filter, preferably

an air filter for a motor vehicle, having the following features:

There are sensor elements for detecting the pressure of a Me¬ to be filtered

diums on at least one on or downstream side of a filter element

present, and / or

- There are sensor elements for detecting the temperature of Me¬ to be filtered

diums on at least one on or downstream side of a Filterele¬

present, there is an energy converter for obtaining electrical energy for the sensor arrangement from the medium to be filtered and / or the environment of the filter,

- There is an energy management device for controlling the power supply of the sensor arrangement available, and

- There is a signal processing module, in particular with a transmitter module, as part of the sensor arrangement available, which preprocessed the signals of the sensor elements and transmitted to a receiver wirelessly.

It is also possible that at least only the pressures of the medium, for example air, are detected as the main measurement data for the filter properties, but an additional temperature measurement to increase the accuracy of the measurement in terms of temperature compensation is advantageous.

In the sensor arrangement according to the invention, the energy converter can advantageously exploit a pressure difference of the medium to be filtered on the arrival and downstream side or between one of these sides and the outer space of the filter. Alternatively, however, the energy converter can also use a temperature difference of the medium to be filtered on the inflow and outflow side or between one of these sides and the outside as an energy source.

[0009] Further alternatives are the utilization of a fluid movement of the medium to be filtered on the inlet and / or outflow side or a mechanical oscillation of the filter or a light source in the region of the filter as an energy source with the known per se converters in question.

With the invention can thus be carried out in a simple manner, for example, an air filter in Luftansaugweg for an internal combustion engine in a motor vehicle such that a wireless transmission of the measured data of the sensor elements to a receiver in the electrical system, for example, a data bus connection (CAN), the Motor vehicle is done or sent directly to an on-board computer and processed there.

The measured data can thus be sent at predetermined time intervals thus telemetry to a receiver always ready to receive and thus make a cable connection from the filter housing to the electrical system of the motor vehicle redundant.

The receiver can also advantageously receive measurement data from several sensor elements otherwise attached to filters or other components and further processed or forwarded, for example, not only of air filters in the intake, but also of oil filters, fuel filters or cabin air filters.

The sensor array with the signal processing block and a transmitter module can be easily mounted on the housing of the filter, for example by clipping, by plugging, by gluing or potting. The sensor arrangement can also be used directly in the disgust the housing of the filter to be injected, since then a simple change between a housing with or without a sensor arrangement is possible.

An alternative invention is to provide a power generating filter system that not only enables sensors, but also to power different systems or generate energy from vibrating or pulsating media or mechanical parts.

This object is achieved by the features of claim 10.

The main advantage of the invention is that on the one hand both mechanical components and pressure changes in a medium, for. B. in liquid or air, is converted into electrical energy. An electromechanical transducer according to the invention is understood to mean a general component in which mechanical energy can be converted into electrical energy, for example a piezoelectric, electrostrictive or magnetostrictive element or an electromagnetic induction coil. The mechanical energy is generated from a directed mechanical force, a pressure change in liquids or gases or a vibration on a filter system.

According to one embodiment of the invention is located on a filter system - to oscillating components - a permanent magnet which is movably mounted within a coil. This is a simple one Method to er¬ from the movement of a system electrical energy

witness. At the same time the system has the advantage that this movement

is dampened by the generation of energy. It is done by the

Energy absorption of the generator a vibration damping.

Particularly advantageous is the energy conversion apply when

certain parts of a filter system, including the housing wall,

be formed as a membrane. This membrane takes the Schwingun¬

gene and transmits them directly to a permanent magnet or

a piezo pickup.

Brief description of the drawings

The invention is based on a figure 1 of the drawing with a Ausfüh¬

explained schematically, the schematically an air filter in a housing

with a mounted on the lid sensor assembly shows, in which the

Energy generation is self-sufficient and wireless data transmission

he follows.

Embodiment (s) of the invention

In Figure 1, an air filter for the filtering of the intake air is a filter 1

Internal combustion engine shown in a motor vehicle. A filter element 2,

for example, nonwoven layers, is arranged in a housing 3, through

the sucked air from the inflow side according to arrow 4 to Abström¬

side flows according to arrow 5.

Here, a sensor arrangement 6 ange¬ on the cover of the housing 3

which consists of an energy converter 7 for supplying energy to the soranordnung 7, an energy management module 8 for controlling the power supply, a sensor element 9 for detecting the pressure of the air as the medium to be filtered, a sensor element 10 for detecting the temperature of the air, a signal processing block 11 and a transmitter module 12, as a further component of the sensor arrangement available with which the signals or the measured data of the sensor elements 9 and 10 can be preprocessed and transmitted to a receiver 13 wirelessly via a transmission link 14.

With the energy converter 7, for example, a pressure or temperature difference of the air can be exploited in the filter 1 to the outside. Thus, the power supply of the sensor assembly 6 can be ensured, which is attached to the housing 3 of the filter 1 by clipping, by plugging, by gluing or potting or only on an exchangeable cover of the housing 3. The wirelessly transmitted from the transmitter module 12 to the receiver 13 measurement data can then be further processed in the electrical system of the motor vehicle in an on-board computer and / or via a Datenbusan- (CAN).

The filter system 110 according to the figure represents a liquid filter. Of course, it is also possible to build an air filter in this way. The system consists of a housing 111, which is constructed essentially concentric and closable with a cover 112. Inside the housing is a filter element 113, consisting of a zigzag folded filter medium 114, which has end plates 115, 116 at the end faces. The lid is closed by a suitable sealing system 117, for example with an O-ring seal. To replace the filter element 113, the lid is unscrewed, the filter element can be removed and replaced by a new filter element. The housing has an inflow opening 118 and an opening 119 for discharging the filtered medium. The medium to be filtered flows after the inflow opening 118 according to the arrow 120 along the filter medium 114, is cleaned by entering the filter medium 114 and leaves according to the arrow 121, the housing via the opening 119. Usually, the medium by piston pumps or other pump systems through the Promoted filter element through. It therefore occur within the filter system vibrations, which lead to a load on the filter medium and the overall housing. These vibrations can be converted into electrical energy. For this purpose, the end plate 115 is provided with a bead 122 and a plunger receptacle 123. The end plate consists for example of a thermoplastic elastomer and acts as a membrane. In the plunger receptacle 123 is a plunger 124 having a permanent magnet 125. The permanent magnet is axially movably mounted within a coil system 126 and biased, for example, with a compression spring 127. Pulsations in the medium create an axial albewegung the permanent magnet 125 within the coil system, so that an electrical energy is generated. This can be tapped via port 128.

Another energy generating unit is located on the housing wall 129. There is also a membrane 130 is provided, which for example also consists of a thermoplastic elastomer and has a plunger seat 131, which in turn is provided with a plunger and a permanent magnet. Due to the pulsation of the liquid or the air, the permanent magnet generates electrical energy in a coil system. The system can be arranged as a plug-on part on the housing. For this purpose, only an annular flange is required on the housing, which is equipped with corresponding circumferential ridges for latching a male part.

The storage of the filter element 113 is designed to be axially movable. For this purpose, a bellows 132 is provided in the region of the opening 119, which carries the filter element 113. At the bellows end plate 116 is attached. However, the bellows can also be part of the end disk, so that the filter element is fastened with this bellows to the connecting piece 133. Via webs 134, 135, a plunger seat 36 is attached to the end plate 116. In this plunger seat, in turn, there is a plunger with a permanent magnet, which engages in a coil system 137 and, in the event of an axial movement or axial vibration of the entire filter terelementes 113 can be tapped off at the terminal 138 electrical

Electricity generated.

Claims

claims

1. Sensor arrangement on a filter (1) with the following features,

there are sensor elements (9) for detecting the pressure of a medium to be filtered on at least one upstream or downstream side of a filter element (2), and / or

- There are sensor elements (10) for detecting the temperature of the to be filtered

Medium on at least one on or downstream side of a filter element (2),

there is an energy converter (7) for obtaining electrical energy for the sensor arrangement (6) from the medium to be filtered or the environment of the filter (1),

- There is an energy management module (8) for controlling the power supply of the sensor arrangement (6) is present, and

- There is a signal processing block (11) as part of the sensor arrangement (6) is provided, with which the signals of the sensor elements vorverbar- be prepared and by means of a transmitter module (12) a receiver (13) can be transmitted wirelessly.

2. Sensor arrangement according to claim 1, characterized in that the energy converter (7) utilizes a pressure difference of the medium to be filtered on the arrival and downstream side (arrows 4 and 5) or between one of these sides and the outer space on the filter (1).

3. Sensor arrangement according to claim 1, characterized in that the energy converter (7) exploits a temperature difference of the medium to be filtered on the arrival and downstream (arrows 4 and 5) or between one of these sides and the outer space on the filter (1).

4. Sensor arrangement according to claim 1, characterized in that the energy converter (7) utilizes a fluid movement of the medium to be filtered on the arrival and / or outflow side (arrows 4 and 5).

5. Sensor arrangement according to claim 1, characterized in that the energy converter (7) exploits a mechanical vibration of the filter (1).

6. Sensor arrangement according to claim 1, characterized in that the energy converter (7) utilizes a light source in the region of the filter (1).

7. Sensor arrangement according to one of the preceding claims, characterized in that the sensor arrangement (6) is attached to the housing (3) of the filter (1) by clipping, by insertion, by gluing or pouring.

8. Sensor arrangement according to one of claims 1 to 7, characterized in that the sensor arrangement (6) is injected directly into the lid of the housing (3) of the filter (1).

9. Sensor arrangement according to one of the preceding claims, characterized in that the filter (1) is an air filter in Luftansaugweg for an internal combustion engine in a motor vehicle and that transmitted wirelessly Measurement data in the electrical system of the motor vehicle in an on-board computer and / or a data bus connection (CAN) are further processed.

10. Energy-producing filter system (110), characterized by the following features:

- A filter element (113) for filtering liquids or gases, which consists in particular of a zigzag folded filter medium (114) which is arranged concentrically and by two end plates (115, 116) is closed at the end edges,

a housing (111) for receiving the filter element (113), which has an opening (118) for the inflow of liquids or gases to be filtered, an opening (119) for discharging the filtered media and a lid (112) for opening the housing ( 111) and replacing the filter element (113), wherein at least one energy generator is provided which generates electrical energy from oscillatory movements on the filter element and / or pulsations of the filtered or to be filtered medium.

11. Energy-generating filter system (110), characterized in that the electrical energy is generated by a magnetic coil system (125).

12. Energy-generating filter system (110) according to claim 1 or 2, characterized in that at least one end plate (115, 116) of the filter element is provided with a membrane which is equipped with a plunger (124), wherein the plunger is a permanent magnet (125 ) and this permanent magnet is movably mounted within a coil (126).

13. Energy-generating filter system (110) according to any one of the preceding claims, characterized in that on the housing (111) a membrane (130) is provided, which via a plunger (124) connected to a magnet (125) and this magnet movable within a Spool (126) is mounted.

14. Energy-generating filter system (110) according to any one of the preceding claims, characterized in that the filter element (113) within the filter housing (111) is mounted axially or radially movable and vibration movements of the filter element is converted via an electromechanical transducer into an electrical voltage.