DE102009048067B4 - Impact sensor with a tubular body - Google Patents

Impact sensor with a tubular body Download PDF

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Publication number
DE102009048067B4
DE102009048067B4 DE102009048067.6A DE102009048067A DE102009048067B4 DE 102009048067 B4 DE102009048067 B4 DE 102009048067B4 DE 102009048067 A DE102009048067 A DE 102009048067A DE 102009048067 B4 DE102009048067 B4 DE 102009048067B4
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Germany
Prior art keywords
sensor
pressure
housing
tubular body
impact
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DE102009048067.6A
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German (de)
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DE102009048067A1 (en
Inventor
Thomas Götz
Lorenz Pfau
Tobias Tyroller
Björg Haupt
Daniel Matlok
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Continental Automotive Technologies GmbH
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Continental Automotive GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0136—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to actual contact with an obstacle, e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Aufprallsensor mit einem schlauchförmigen Körper und zumindest einem Sensor zur Erfassung der Druckänderung im schlauchförmigen Körper und Erkennung eines Aufpralls aus der Druckänderung,
wobei zumindest ein Sensor in einem Gehäuse angeordnet und Mittel zum Druckausgleich zwischen schlauchförmigen Körper und der Umgebung vorgesehen sind, dadurch gekennzeichnet, dass
der schlauchförmige Körper mit dem Gehäuse dieses Sensors druckdicht verbunden ist und über Mittel am Gehäuse dieses Sensors der Druckausgleich erfolgt.Impact sensor with a tubular body and at least one sensor for detecting the change in pressure in the tubular body and detecting an impact from the pressure change,
wherein at least one sensor arranged in a housing and means for pressure equalization between the tubular body and the environment are provided, characterized in that
the tubular body is connected in a pressure-tight manner to the housing of this sensor and the pressure compensation takes place via means on the housing of this sensor.

Description

Die Erfindung betrifft einen Aufprallsensor mit einem schlauchförmigen Körper gemäß dem Oberbegriff von Anspruch 1. Aus der DE 199 46 825 C1 ist ein gattungsgemäßer Aufprallsensor bekannt, bei dem eine Ausgleichsöffnung, evt. steuerbar mittels eines Ventils vorgesehen ist, um einen Druckausgleich zwischen dem schlauchförmigen Körper und der Umgebung zu ermöglichen. Zwar sind während des Aufpralls dynamische Druckunterschiede zwischen der Umgebung und dem Inneren des Schlauchs ja gerade für den Aufprall signifikant und daher gewünscht und werden gemessen. Dauerhafte Druckunterschiede können aber beispielsweise aufgrund von Temperatureinflüssen oder dauerhafte Deformation des Schlauchs auftreten und zur Belastung des bzw. der Sensoren, zum Eindringen von Feuchtigkeit ins Schlauchinnere und damit Gefährdung der Sensoren und Elektronik führen.The invention relates to an impact sensor with a tubular body according to the preamble of claim 1. From the DE 199 46 825 C1 a generic impact sensor is known in which a compensation opening, possibly controllable by means of a valve is provided to allow pressure equalization between the tubular body and the environment. Although during the impact dynamic pressure differences between the environment and the interior of the tube are indeed significant for the impact and therefore desired and measured. However, permanent pressure differences can occur, for example, due to temperature influences or permanent deformation of the hose and lead to loading of the sensor (s), the penetration of moisture into the hose interior and thus endangering the sensors and electronics.

Die Verwendung von Druckausgleichsöffnungen in die Umgebung ist jedoch äußerst kritisch.However, the use of pressure equalization ports in the environment is extremely critical.

Dauerhaft offene Druckausgleichsöffnungen sind in der Regel relativ klein, da ansonsten ja die gewünschten Druckunterschiede während des Aufpralls zu stark gedämpft würden. Dabei besteht aber über die Lebensdauer eines Fahrzeugs hinweg die Gefahr des Verschlusses dieser Öffnung aufgrund von Verschmutzung aus der Umgebung. Die Verwendung steuerbarer Ventile ermöglicht größere Öffnungen, führt aber trotzdem zum Einlass von evt. feuchter Umgebungsluft und Kondensation von Feuchtigkeit im Inneren des Schlauchs.Permanently open pressure compensation openings are usually relatively small, since otherwise the desired pressure differences would be too much attenuated during the impact. But there is the risk of the closure of this opening due to pollution from the environment over the life of a vehicle away. The use of controllable valves allows larger openings, but still leads to the entry of possibly moist ambient air and condensation of moisture inside the hose.

Aufgabe der Erfindung ist es, einen Aufprallsensor mit schlauchförmigem Körper vorzustellen, bei dem mit einfachen Mitteln ein sicherer Druckausgleich erfolgt.The object of the invention is to introduce an impact sensor with a tubular body in which a simple pressure equalization takes place.

Diese Aufgabe wird durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen der Erfindung ergeben sind aus den Unteransprüchen, wobei auch Kombinationen und Weiterbildungen einzelner Merkmale miteinander denkbar sind.This object is solved by the features of the independent claims. Advantageous developments of the invention will become apparent from the dependent claims, wherein combinations and developments of individual features are conceivable with each other.

Ein wesentlicher Gedanke der Erfindung besteht darin, dass auch ein zumindest einen der Sensoren umschließendes Gehäuse vorzugsweise Mittel zu einem Druckausgleich aufweisen kann und diese für den Druckausgleich des Schlauchs mit genutzt werden können.An essential idea of the invention is that even a housing enclosing at least one of the sensors can preferably have means for pressure equalization and these can be used for pressure equalization of the hose.

So ist der schlauchförmige Körper mit dem Gehäuse dieses Sensors druckdicht verbunden und erfolgt der Druckausgleich über Mittel am Gehäuse dieses Sensors.Thus, the tubular body is pressure-tightly connected to the housing of this sensor and the pressure compensation via means on the housing of this sensor.

Dazu ist vorzugsweise im Inneren des Gehäuses zwischen dem schlauchförmigen Körper und dem Sensor eine Druckausgleichsöffnung zwischen dem schlauchförmigen Körper und dem Inneren des Gehäuses vorgesehen. Bereits der Druckausgleich zum Inneren des Gehäuses kann extreme Druckunterschiede verhindern, ermöglicht aber insbesondere auch Druckausgleichsmittel am Gehäuse des Sensors zu nutzen.For this purpose, a pressure equalization opening between the tubular body and the interior of the housing is preferably provided in the interior of the housing between the tubular body and the sensor. Even the pressure balance to the interior of the housing can prevent extreme pressure differences, but in particular also allows to use pressure compensation means on the housing of the sensor.

In einer bevorzugten Ausgestaltung ist im Steckerbereich des Gehäuses des Sensors eine Druckausgleichsöffnung zum Stecker und von diesem in die elektrische Anschlussleitung vorgesehen, wobei die Anschlussleitung einen druckelastischen äußeren Isolationsmantel aufweist. Der Isolationsmantel der Anschlussleitung ermöglicht dabei den Druckausgleich zur Umgebung, ohne dass Feuchtigkeit eindringen könnte.In a preferred embodiment, a pressure compensation opening is provided in the plug region of the housing of the sensor to the plug and from this into the electrical connection line, wherein the connection line has a pressure-elastic outer insulation jacket. The insulation sheath of the connection line enables pressure equalization to the environment without moisture penetrating.

Alternativ kann am Gehäuse des Sensors eine Druckausgleichsöffnung zur Umgebung angeordnet sein, welche vorzugsweise mittels einer feuchtigkeitsundurchlässigen Membran (bspw. sogenannte Gore-Tex-Membran - Gore-Tex Trademark der W.L. Gore & Ass.) geschützt ist.Alternatively, a pressure compensation opening to the environment can be arranged on the housing of the sensor, which is preferably protected by means of a moisture-impermeable membrane (for example the so-called Gore-Tex membrane - Gore-Tex Trademark of W. L. Gore & Ass.).

Alternativ kann am Gehäuse des Sensors ein Druckausgleichsbehälter beispielsweise in Form eines verschieblichen Kolbens vorgesehen sein, der ebenfalls einen Druckausgleich ermöglicht, ohne dass Feuchtigkeit ins Gehäuse oder den Schlauch eindringen könnte.Alternatively, it may be provided on the housing of the sensor, a pressure compensating container, for example in the form of a displaceable piston, which also allows pressure equalization, without moisture could penetrate into the housing or the hose.

Claims (5)

Aufprallsensor mit einem schlauchförmigen Körper und zumindest einem Sensor zur Erfassung der Druckänderung im schlauchförmigen Körper und Erkennung eines Aufpralls aus der Druckänderung, wobei zumindest ein Sensor in einem Gehäuse angeordnet und Mittel zum Druckausgleich zwischen schlauchförmigen Körper und der Umgebung vorgesehen sind, dadurch gekennzeichnet, dass der schlauchförmige Körper mit dem Gehäuse dieses Sensors druckdicht verbunden ist und über Mittel am Gehäuse dieses Sensors der Druckausgleich erfolgt.Impact sensor with a tubular body and at least one sensor for detecting the change in pressure in the tubular body and detection of an impact from the pressure change, wherein at least one sensor disposed in a housing and means for pressure equalization between the tubular body and the environment are provided, characterized in that the tubular body is pressure-tightly connected to the housing of this sensor and via means on the housing of this sensor, the pressure compensation takes place. Aufprallsensor nach Anspruch 1, dadurch gekennzeichnet, dass im Inneren des Gehäuses zwischen dem schlauchförmigen Körper und dem Sensor eine Druckausgleichsöffnung zwischen dem schlauchförmigen Körper und dem Inneren des Gehäuses vorgesehen ist.Impact sensor after Claim 1 , characterized in that in the interior of the housing between the tubular body and the sensor, a pressure equalization opening between the tubular body and the interior of the housing is provided. Aufprallsensor nach Anspruch 2, dadurch gekennzeichnet, dass im Steckerbereich des Gehäuses des Sensors eine Druckausgleichsöffnung zum Stecker und von diesem in die elektrische Anschlussleitung vorgesehen ist, wobei die Anschlussleitung einen druckelastischen äußeren Isolationsmantel aufweist.Impact sensor after Claim 2 , characterized in that in the plug region of the housing of the sensor, a pressure equalization opening to the plug and of this is provided in the electrical connection line, wherein the connecting line having a pressure-elastic outer insulating jacket. Aufprallsensor nach Anspruch 2, dadurch gekennzeichnet, dass am Gehäuse des Sensors eine Druckausgleichsöffnung zur Umgebung angeordnet ist, welche mittels einer feuchtigkeitsundurchlässigen Membran geschützt ist.Impact sensor after Claim 2 , characterized in that the housing of the sensor, a pressure equalization opening is arranged to the environment, which is protected by a moisture-impermeable membrane. Aufprallsensor nach Anspruch 2, gekennzeichnet, dass am Gehäuse des Sensors ein Druckausgleichsbehälter vorgesehen ist.Impact sensor after Claim 2 , characterized in that a pressure compensation container is provided on the housing of the sensor.
DE102009048067.6A 2009-10-01 2009-10-01 Impact sensor with a tubular body Active DE102009048067B4 (en)

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Application Number Priority Date Filing Date Title
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DE102009048067A1 DE102009048067A1 (en) 2011-04-07
DE102009048067B4 true DE102009048067B4 (en) 2019-08-29

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Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011011964A1 (en) * 2011-02-22 2012-08-23 Continental Automotive Gmbh Impact sensor for motor car, has pressure sensor for detecting pressure change in cavity of elastically deformable hose
DE102011011963B4 (en) * 2011-02-22 2020-03-12 Continental Automotive Gmbh Impact sensor with an elastically deformable hose and at least one pressure sensor
DE102011011962A1 (en) * 2011-02-22 2012-08-23 Continental Automotive Gmbh Crash sensor for motor car, has deformable hose with cavity and pressure sensor for acquisition of pressure change in cavity of hose, where crash is resilient, and hose is made of cross linked silicone material
DE102011007881B4 (en) 2011-04-21 2020-07-16 Bayerische Motoren Werke Aktiengesellschaft Diagnosis of a personal protection system
DE102011080754B4 (en) * 2011-08-10 2020-08-20 Bayerische Motoren Werke Aktiengesellschaft Device for detecting the impact of an object on a vehicle
DE102011083027A1 (en) * 2011-09-20 2013-03-21 Bayerische Motoren Werke Aktiengesellschaft Device for detecting the impact of an object on a vehicle
DE102012101856B4 (en) 2012-03-06 2021-06-24 Continental Automotive Gmbh Method for the functional test of an impact sensor system consisting of a cavity and pressure sensors
DE102013215331A1 (en) * 2013-08-05 2015-02-05 Continental Automotive Gmbh Impact sensor for a motor vehicle with two pressure sensors in an electronics housing and a movable wall section therebetween
DE102013216718A1 (en) * 2013-08-22 2015-02-26 Continental Automotive Gmbh Impact sensor with elastically deformable hose and pressure sensor and two-stage pressure compensation
DE102017207563A1 (en) * 2017-05-05 2018-11-08 Continental Automotive Gmbh Impact sensor with an elastically deformable in a collision hose and pressure sensor units and at least one means for pressure equalization
DE102017218945A1 (en) * 2017-10-24 2019-04-25 Robert Bosch Gmbh Pressure sensor for a personal protection system of a vehicle
DE102018206210A1 (en) 2018-04-23 2019-10-24 Continental Automotive Gmbh Cover arrangement for a sensor and pedestrian protection sensor for a vehicle
EP3835747A1 (en) 2019-12-10 2021-06-16 Veoneer Sweden AB Sensor assembly
EP3835137B1 (en) 2019-12-10 2024-02-21 Veoneer Sweden Safety Systems AB Impact sensor assembly

Citations (11)

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DE19647408C1 (en) * 1996-03-21 1997-11-13 Siemens Ag Pressure sensor for vehicle door
DE19946825C1 (en) * 1999-09-30 2001-02-08 Daimler Chrysler Ag Housing device for receiving electrical assembly, has air tight assembly providing pressure balance
DE10114465A1 (en) * 2001-03-24 2002-09-26 Volkswagen Ag Detection of a motor vehicle impact by use of a contact sensor, in the form or a fluid filled tube, along the front bumper bar with attached pressure sensors, with the rate of pressure change used to indicate an impact
DE10137250A1 (en) * 2001-07-31 2003-02-13 Bayerische Motoren Werke Ag Sensor device for vehicles
DE10232523A1 (en) * 2002-07-18 2004-01-29 Bayerische Motoren Werke Ag Car accident sensor has piezo or electromagnetic test pressure generator with sensor to compare with stored data
DE10321209A1 (en) * 2003-05-12 2004-12-23 Siemens Ag Vehicle crash sensor has hollow body in bumper with pressure sensors to detect waves generated by impacts
DE102004031575A1 (en) * 2004-06-29 2006-02-02 Daimlerchrysler Ag Motor vehicle collision detecting device, has two pressure sensors that are arranged at specific distance in hollow body, and run time differences for pressure signals of pressure surge between sensors are determined at impact place
DE102004031577A1 (en) * 2004-06-29 2006-02-09 Daimlerchrysler Ag Crash damage sensor for road vehicle has pipe on front of vehicle, filled with substance containing ferromagnetic spheres, connected at ends to magnetic sensors connected to control circuit
DE102004055402A1 (en) * 2004-11-17 2006-05-18 Daimlerchrysler Ag Motor vehicle collision detection device, has control unit to process weight of object colliding on vehicle based on electrical signals, which is produced in coils due to shock wave in elastic tube, to activate corresponding safety system
DE102007044814A1 (en) * 2007-09-20 2009-04-02 Daimler Ag Sensor with a liquid-filled hollow body
DE102009010476A1 (en) * 2008-03-18 2009-09-24 DENSO CORPORATION, Kariya-shi A collision detection device for detecting a collision of a vehicle

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19647408C1 (en) * 1996-03-21 1997-11-13 Siemens Ag Pressure sensor for vehicle door
DE19946825C1 (en) * 1999-09-30 2001-02-08 Daimler Chrysler Ag Housing device for receiving electrical assembly, has air tight assembly providing pressure balance
DE10114465A1 (en) * 2001-03-24 2002-09-26 Volkswagen Ag Detection of a motor vehicle impact by use of a contact sensor, in the form or a fluid filled tube, along the front bumper bar with attached pressure sensors, with the rate of pressure change used to indicate an impact
DE10137250A1 (en) * 2001-07-31 2003-02-13 Bayerische Motoren Werke Ag Sensor device for vehicles
DE10232523A1 (en) * 2002-07-18 2004-01-29 Bayerische Motoren Werke Ag Car accident sensor has piezo or electromagnetic test pressure generator with sensor to compare with stored data
DE10321209A1 (en) * 2003-05-12 2004-12-23 Siemens Ag Vehicle crash sensor has hollow body in bumper with pressure sensors to detect waves generated by impacts
DE102004031575A1 (en) * 2004-06-29 2006-02-02 Daimlerchrysler Ag Motor vehicle collision detecting device, has two pressure sensors that are arranged at specific distance in hollow body, and run time differences for pressure signals of pressure surge between sensors are determined at impact place
DE102004031577A1 (en) * 2004-06-29 2006-02-09 Daimlerchrysler Ag Crash damage sensor for road vehicle has pipe on front of vehicle, filled with substance containing ferromagnetic spheres, connected at ends to magnetic sensors connected to control circuit
DE102004055402A1 (en) * 2004-11-17 2006-05-18 Daimlerchrysler Ag Motor vehicle collision detection device, has control unit to process weight of object colliding on vehicle based on electrical signals, which is produced in coils due to shock wave in elastic tube, to activate corresponding safety system
DE102007044814A1 (en) * 2007-09-20 2009-04-02 Daimler Ag Sensor with a liquid-filled hollow body
DE102009010476A1 (en) * 2008-03-18 2009-09-24 DENSO CORPORATION, Kariya-shi A collision detection device for detecting a collision of a vehicle

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