EP2864165A1 - Messeinrichtung zum messen eines reibungskoeffizienten an einem antriebsrad - Google Patents
Messeinrichtung zum messen eines reibungskoeffizienten an einem antriebsradInfo
- Publication number
- EP2864165A1 EP2864165A1 EP14738384.8A EP14738384A EP2864165A1 EP 2864165 A1 EP2864165 A1 EP 2864165A1 EP 14738384 A EP14738384 A EP 14738384A EP 2864165 A1 EP2864165 A1 EP 2864165A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- measuring device
- pass filter
- electric motor
- hertz
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2210/00—Detection or estimation of road or environment conditions; Detection or estimation of road shapes
- B60T2210/10—Detection or estimation of road conditions
- B60T2210/12—Friction
Definitions
- Measuring device for measuring a friction coefficient on a drive wheel
- the invention relates to a measuring device for measuring a road friction of a vehicle wheel according to the preamble of claim 1.
- the invention further relates to a suitably equipped electric motor according to the preamble of claim 9.
- a drive with at least one electric motor as
- Electric drive designates. Generic electric drives are typically controlled by a regulation. If the engine power is large, conventional electronic power actuators are switched between the controller and the electric motor. These are considered here as part of the electric drive.
- control of the electric drive in the form of a speed, torque, position, speed or more variable control is executed.
- control of the electric drive in the form of a speed, torque, position, speed or more variable control is executed.
- the skilled person also separate components for the inputs and
- Monitoring devices also known as an energy source in the form of a network connection, a generator in the form of a fuel cell or a rechargeable battery or double-layer capacitor, for example in the form of so-called ultra or supercaps.
- Electric motor vehicles Vehicles that have such an electric drive and are not tied to rails are known in the automotive industry as electric motor vehicles.
- the terms used for different types of electric vehicles in the art are extensive, but at the present time little systematic and ambiguous.
- the term “electric motor vehicle” is therefore to be used in its comprehensive sense, which is called hybrid electric motor vehicles, which have an additional,
- non-electric drive system - such as an internal combustion engine - without having direct mechanical connection to the drive train expressly includes.
- the problem in this context is to ensure the highest possible driving safety.
- the contact between the vehicle and the roadway only by several approximately palm-sized areas, the
- DE 10 2009 022 592 A1 therefore proposes a method for determining the road friction coefficient during operation of a motor vehicle, which also appears to be fundamentally suitable for use in electric motor vehicles.
- the tire return torques of the wheels of an axle are measured or determined from measured variables in accordance with this approach.
- the lateral forces and / or the lateral acceleration are determined on these wheels.
- the invention therefore has the task of a structurally simplified
- Such an electric motor may for example be a wheel near electric motor.
- Wheel near electric motors can be arranged on a chassis component or, although less frequently, on a body part.
- wheels are close to electric motors a wishbone arranged, wherein the electric motor at one end fixed to the
- a shaft transmits the moment of the electric motor to a drive wheel.
- the wheel near the electric motor can each have a shaft at both ends which transmit the torque of the electric motor to the opposite wheels of a vehicle axle.
- such an electric motor can also be a wheel hub motor. This is directly integrated in a vehicle wheel of the electric motor vehicle and at the same time carries its associated wheel hub. A part of the electric motor can therefore transmit the torque generated by this, waiving a classic drive train directly to the revolving around it with the vehicle. Since the driving of the electric motor
- Components of a conventional drive train are attenuated, they act directly on the vehicle wheel adjacent to the electric motor and induce in this a high-frequency alternating current, which can manifest itself in a measurable alternating component of the voltage dropping between the poles of the electric motor.
- the evaluation circuit determines at least the road friction based on at least that of the
- Transducer detected AC voltage component wherein the transducer detects the AC voltage component of the voltage applied to the electric motor total voltage.
- the transducer can be based on a between a
- Voltage input and a voltage output arranged high-pass filter circuit can be realized, due to their configuration of only
- Such a high-pass filter circuit can be realized in a straightforward manner by means of an ohmic resistance and a capacitor of known electrical capacity connected in series with the wished one
- Substantially linear, time-invariant system which allows the developer, in view of his simple transformation equations, to flexibly design the system behavior by means of familiar configuration parameters at comparatively low unit costs.
- the cut-off frequency of the high-pass filter circuit based on such an RC element can be structurally varied within a wide range by suitable dimensioning of the capacitor. From this point of view, it is advisable to choose a capacity that allows the filter to pass especially AC components in the frequency range above 25 Hertz, since voltage components of corresponding frequencies are to be fed to the evaluation as an indication of increased road friction of the vehicle wheel.
- the capacities of the individual high passes should be chosen so that each has a different cutoff frequency.
- Circuit alternative digitizing the sensor supplied by the sensor Analog signal allowed by detecting the exceeding of a predetermined reference voltage By suitable concatenation of a plurality of such comparators can be even gradations of the voltage amplitude
- comparator may be considered the use of a Schottky diode, which allows a safe rectification of the AC voltage component even at high voltage frequencies.
- a correspondingly designed evaluation circuit thus enables the construction of a measuring device which can be integrated into fast TTL logic circuits by means of powerful MOSFETs.
- Fig. 1 shows the simplified circuit diagram of a measuring device according to the invention
- Fig. 2 is a line diagram of the functional relationship between a
- Figure 1 illustrates the structure of a measuring device 1 according to an exemplary embodiment of the invention for measuring a road friction. According to DIN 1319
- a measuring device the entirety of all measuring devices and additional devices for detecting the frictional forces is used here
- the measuring device 1 of Figure 1 is connected according to the invention with an electric motor 2, in particular with a wheel hub or wheel near electric motor of the electric motor vehicle.
- an electric motor 2 in particular with a wheel hub or wheel near electric motor of the electric motor vehicle.
- Vehicle wheel detectable electrical alternating currents within the electric motor 2 is able to induce.
- this phenomenon manifests itself in the form of a superposition of falling between the electrical poles of the motor 2 DC voltage by periodic voltage fluctuations, which as a result to a skilled in the art
- a measured value sensor 3, 4, 5 connected to the electric motor 2 via a voltage input 13, 14 serves in the given embodiment to isolate three alternating voltage components 9, 10, 11 contained in the total voltage 12
- the transducer 3, 4, 5 comprises a parallel connection of three electrical filters, which the total voltage 12 depending on the voltage frequency f of the AC voltage components 9, 10, 11 in their
- the filters used are so-called high-pass filter circuits 15, 16; 17, 18; 19, 20, also known as high passes or depth locks, let the AC components 9, 10, 11 of a frequency / above their respective cutoff frequency pass almost unattenuated and attenuate lower frequencies.
- Embodiment put as so-called high passages first order in each case of an ohmic resistance 15, 17, 19 and a respective resistor 15, 17, 19 connected in series electrical capacitance 16, 18, 20 in the form of a capacitor together.
- the constructional reactance of the capacitor blocks the flow of current through the high-pass filter circuits 15, 16; 17, 18; 19, 20.
- the cut-off frequencies of the high-pass filter circuits 15, 16; 17, 18; 19, 20 are selected by dimensioning the respective capacitances 16, 18, 20 such that the alternating voltage component 9 dropping at the first voltage output 21, 22 has a voltage frequency f between 20 and 25 hertz, the alternating voltage component 10 dropping at the second voltage output 23, 24 Voltage frequency f between 28 and 30 hertz and at the third voltage output 25, 26 falling
- AC voltage component 11 has a voltage frequency / "between 35 and 40 Hertz.
- the voltage frequencies said f are chosen as an example and can practice due also differ by up to five Hertz.
- the voltage frequencies f are not limited to low voltage frequencies f. Likewise, the
- the said AC voltage components 9, 10, 11 are on the
- FIG. 2 illuminates a functional relationship between the voltage frequency f and the voltage amplitude Q of the alternating voltage component 9, 10, 11 on which the evaluation circuit 6, 7, 8 is based, with different coefficients of friction ⁇ 1, ⁇ 2 , ⁇ 3.
- the diagonal auxiliary lines of the diagram illustrate that the
- Voltage amplitude Q increases approximately linearly with increasing voltage frequency f.
- Voltage frequency f allows the evaluation circuit 6, 7, 8, the distinction between three different friction coefficients ⁇ , ⁇ 2 , ⁇ 3 , where a higher
- Amplitude gradient is considered an empirical indication of increased road friction.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201310011998 DE102013011998A1 (de) | 2013-07-18 | 2013-07-18 | Messeinrichtung zum Messen eines Reibungskoeffizienten an einem Antriebsrad |
PCT/EP2014/001802 WO2015007368A1 (de) | 2013-07-18 | 2014-07-01 | Messeinrichtung zum messen eines reibungskoeffizienten an einem antriebsrad |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2864165A1 true EP2864165A1 (de) | 2015-04-29 |
Family
ID=51176323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14738384.8A Withdrawn EP2864165A1 (de) | 2013-07-18 | 2014-07-01 | Messeinrichtung zum messen eines reibungskoeffizienten an einem antriebsrad |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2864165A1 (de) |
DE (1) | DE102013011998A1 (de) |
WO (1) | WO2015007368A1 (de) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3681786B2 (ja) * | 1995-05-01 | 2005-08-10 | 本田技研工業株式会社 | 前後輪駆動車両 |
DE102009022592B4 (de) | 2009-05-26 | 2020-07-09 | Volkswagen Ag | Verfahren zur Ermittlung des Fahrbahnreibwerts während des Betriebs eines Kraftfahrzeugs |
-
2013
- 2013-07-18 DE DE201310011998 patent/DE102013011998A1/de not_active Withdrawn
-
2014
- 2014-07-01 EP EP14738384.8A patent/EP2864165A1/de not_active Withdrawn
- 2014-07-01 WO PCT/EP2014/001802 patent/WO2015007368A1/de unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2015007368A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2015007368A1 (de) | 2015-01-22 |
DE102013011998A1 (de) | 2015-01-22 |
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