WO2005026861A2 - Pedal device for motor vehicles - Google Patents

Pedal device for motor vehicles Download PDF

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Publication number
WO2005026861A2
WO2005026861A2 PCT/DE2004/001510 DE2004001510W WO2005026861A2 WO 2005026861 A2 WO2005026861 A2 WO 2005026861A2 DE 2004001510 W DE2004001510 W DE 2004001510W WO 2005026861 A2 WO2005026861 A2 WO 2005026861A2
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WO
WIPO (PCT)
Prior art keywords
leaf spring
pedal
deformation
spring
evaluation electronics
Prior art date
Application number
PCT/DE2004/001510
Other languages
German (de)
French (fr)
Other versions
WO2005026861A3 (en
Inventor
Thomas Klotzbuecher
Bernhard Bauer
Harald Kazmierczak
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2005026861A2 publication Critical patent/WO2005026861A2/en
Publication of WO2005026861A3 publication Critical patent/WO2005026861A3/en

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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
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
    • G05G1/30—Controlling members actuated by foot
    • G05G1/38—Controlling members actuated by foot comprising means to continuously detect pedal position

Definitions

  • Pedal device for motor vehicles including a position transmitter for the pedal, which generates an electrical control signal dependent on the pedal position, and a spring device in the form of at least one that is elastically deformable when the pedal is actuated Leaf spring, in the deformation region of which a deformation or force sensor for generating a deformation or force signal is arranged, in the dependence of which evaluation electronics generate the actuating signal, according to the preamble of claim 1.
  • a pedal device is, for example, from DE 40 24 018 A1 known.
  • the one-piece leaf spring By the leaf spring carrying the evaluation electronics, the connections of which are electrically conductively connected to a section of the leaf spring to which at least one electrical contact is formed as an interface for the connection of electrical components or line elements, the one-piece leaf spring also functions as a carrier element of the evaluation electronics and as Signal-conducting connection between this and the electrical contact that is molded onto it. This reduces the number of components to be assembled, which has a favorable effect on the manufacturing costs.
  • the electrical contact integral with the leaf spring is preferably connected to a line connection by means of a plug. Connection connectable, which controls the control signal in an engine control unit of the motor vehicle.
  • the electrical contact from a region of the leaf spring which is arranged outside the deformation region includes plug tongues for the electrical plug which protrude in parallel at the end and are spaced apart in the transverse direction.
  • the tongues are made, for example, by punching the leaf spring.
  • one end of a return spring arrangement for generating a return force counteracting the actuating force on the pedal is supported on the deformation region of the leaf spring and the other end is supported on the pedal.
  • the return spring assembly includes, for example, one or more coil springs.
  • a protruding receptacle for the helical springs is molded onto the deformation area of the leaf spring and can be produced inexpensively.
  • the actuating forces acting on the pedal are transmitted to the leaf spring via the return spring arrangement and ensure in their deformation area that the leaf spring is deformed or loaded by the deformation or force sensor and to generate the actuating signal proportional to the deformation or the load.
  • the evaluation electronics and a section of the leaf spring which is arranged outside the deformation region and in the vicinity of the electrical contact are preferably connected to one another by means of a sheathing injection molded plastic body. This prevents the function of the evaluation electronics from being influenced by the deformation taking place in the deformation area of the leaf spring. In addition, a secure fixation is due to the material connection Evaluation electronics given on the leaf spring, which is simple and inexpensive to implement. Due to the adjacent arrangement of the electrical contacts and the evaluation electronics, the line paths are short, with a correspondingly low signal attenuation. 5
  • the deformation or force sensor is preferably formed by a strain gauge which is attached to the leaf spring with the interposition of an insulating layer in order to provide insulation of the electrical contact of the leaf spring with respect to the electrically conductive strain gauge.
  • At least the deformation area of the leaf spring preferably spans a depression of a bearing block of the pedal device, at least the ends of the leaf spring being clamped in the bearing block.
  • the bearing block is formed by an injection molding in which the ends of the leaf spring are cast.
  • the leaf spring together with the evaluation electronics and the deformation or force sensor, with the exception of at least a free part of the electrical contact is covered by a protective layer, which is covered, for example, by a lacquer layer or an elastomer layer is formed.
  • FIG. 1 shows a longitudinal section through a pedal device according to a preferred embodiment with a leaf spring
  • FIG. 2 shows a cross section through the pedal device from FIG. 1
  • 3 shows a schematic longitudinal sectional illustration of the leaf spring from FIG. 1
  • 4 shows a schematic plan view of the leaf spring of FIG. 1.
  • the pedal device 1 of a motor vehicle shown in FIG. 1 includes a pedal 6 which can be actuated by the driver and is pivotally mounted on a bearing block 2 about a pivot axis 4, of which only a section near the bearing block is shown for reasons of scale.
  • the pedal device 1 is fastened to a body structure of the motor vehicle via fastening eyes 8 formed in the bearing block 2, as can be seen in particular from FIG.
  • a standing or hanging accelerator 6 wherein the application of the invention, on an accelerator pedal 6 of a motor vehicle is not limited, however. Rather, it can also be implemented in a brake or clutch pedal.
  • the accelerator pedal 6 is loaded by a restoring force acting against the actuating force, the restoring force being generated by a restoring spring arrangement 10 which contains two coaxial and interleaved coil springs 12, each of which has one end on a pin-shaped spring receptacle 14 on the accelerator pedal 6 and the other end is received and centered on a projecting spring receptacle 16 of a leaf spring 18 extending transversely to the coil springs 12 and consisting of a spring steel.
  • the spring retainer 16. is located in a deformation region 20 of the leaf spring 18, which takes up about a third as viewed from the right end 22 in FIG. 1 and spans a depression 24 in the bearing block 2.
  • the spring-specific parameters including for example, the spring rate of the leaf spring 18 and the span over the recess 24 to be adapted to the respective requirements, for example in such a way that the maximum deflection of the leaf spring 1 8 is approximately 2 mm when the accelerator pedal is fully actuated.
  • At least the ends 22, 26 of the leaf spring 18 are clamped in the bearing block 2. This can preferably take place in that the bearing block 2 is formed by an injection molding made of plastic, into which the ends 22, 26 of the leaf spring 18 are poured or injected. Alternatively, the ends 22, 26 of the leaf spring could also be clamped between two shells of the bearing block 2 braced together.
  • the pedal device 1 also includes a position transmitter which supplies an electrical position signal which is dependent on the accelerator pedal position for higher-level control and regulating devices of the motor vehicle, for example for an engine control unit.
  • a position transmitter which supplies an electrical position signal which is dependent on the accelerator pedal position for higher-level control and regulating devices of the motor vehicle, for example for an engine control unit.
  • at least one deformation or force sensor 28 for generating a deformation or force signal is arranged in the deformation region 20 of the leaf spring 18, and an electronic evaluation unit 30 generates the control signal as a function of the latter.
  • the deformation or force sensor is preferably formed by a strain gauge 28 attached to the side of the leaf spring 18 facing the gas pedal 6, with which the deformation of the deformation area 20 of the leaf spring 18 can be measured when the gas pedal 6 is actuated.
  • the deflection of the leaf spring 18 stretches the strain gauge 28 and thereby changes its electrical resistance.
  • the control signal is generated from this change in resistance in evaluation electronics 30 which is electrically connected to the strain gauge 28 and which is a measure of the extent of the strain gauge 28 and thus a measure of the deflection of the strain gauge
  • Leaf spring 1 8 is due to the actuation of the accelerator pedal 6.
  • the evaluation electronics 30 is not shown in detail and is state of the art.
  • the strain gauge 28 can be integrated in a so-called full-bridge circuit, which is calibrated when the accelerator pedal 6 is not actuated, that is to say without current. This adjustment is disturbed by the change in resistance of the strain gauge 28 as a result of accelerator pedal actuation and a current flows in the bridge branch, which is a measure of the deflection of the accelerator pedal 6.
  • a strain gauge 28 it is also possible to use other sensors with which the deformation of the leaf spring 18 or the force acting on it can be measured, for example piezoelectric sensors.
  • the leaf spring 18 carries the evaluation electronics 30.
  • connection elements 32 which transmit the actuating signal, are electrically conductively connected to a section of the leaf spring 18, on which electrical contact elements 34 for the connection of an electrical plug of a line connection are formed, which transmit the actuating signal to an engine control unit of the motor vehicle.
  • the electrical contact elements are preferably designed as plug tongues 34 projecting parallel from the left end 26 of the leaf spring 18 in FIG. 1 and spaced apart in the transverse direction, which protrude into a plug cavity 36 into which the plug can be inserted
  • the evaluation electronics 30 is arranged in the immediate vicinity of the tabs 34 and outside the deformation area 20 of the leaf spring 18. It is connected to the leaf spring 18 by an injection-molded body 38 made of plastic, which at least partially surrounds both components, ie the evaluation electronics 30 are placed on the side of the leaf spring 18 facing the accelerator pedal 6 and then molded with injection-molded plastic until an injection-molded body 38 is formed which completely encases the evaluation electronics 30 (FIG. 3), so that both components 18, 30 are integrally connected to one another. Furthermore, a section 40 of the tongues 34 facing the evaluation electronics 30 is shown in FIGS Injection molded body 38 is cast in, which in all other respects projects beyond the evaluation electronics 30.
  • the tongues 34 are manufactured, for example, by stamping the leaf spring 18. In order to avoid a short-circuit between the different connections 32 of the plug-in tongues 34 assigned to the evaluation electronics, these are first connected to one another by transverse webs not shown in the figures. After the partial pouring of the tongues 34 into the injection molded body 38, these crosspieces are removed, so that the tongues 34 are also held by the material connection of the injection molded body 38. In order to insulate the signal-carrying tongues 34 from the electrically conductive strain gauge 28, the latter is attached to the leaf spring 1.8 with the interposition of an insulating layer 42 (FIG. 3). Between the evaluation electronics 30 and the strain gauge 28, electrical lead wires 44 are laid, which are connected to the corresponding connections 32 by soldering, bonding or welding.
  • the leaf spring 18 carries the strain gauge 28, the lead wires 44 between the strain gauge 28 and the evaluation electronics 30, and the latter itself. Furthermore, the leaf spring 18 acts as a supporting element for the return spring arrangement 10 of the accelerator pedal 6. Finally, its tabs 34 are for transmitting the Signals of the evaluation electronics 30 are formed by means of a plug connection. Consequently, the leaf spring 18 together with the components 28, 30, 44 held on it forms a preassembled and multifunctional leaf spring module 46, which can be mounted on the bearing block 2 as a whole and is shown in its entirety in FIGS. 3 and 4.
  • this leaf spring module 46 In order to protect this leaf spring module 46 from dirt, corrosion or other external influences, it is covered with a protective layer, with the exception of the tabs 34 to be kept free, which for example through a layer of lacquer or a thermoplastic, sprayed on elastomer layer.

Abstract

The invention relates to a pedal device (1) for motor vehicles, comprising a position indicator (28, 30) for the pedal (6), which generates an electric signal depending on the pedal position, and a spring device in the form of at least one laminated spring (18) which is elastically deformed when the pedal is actuated. A deformation or force sensor (28) for generating a deformation or force signal is disposed in the deformation area (20) and an evaluation electronics generates (30) the actuator signal in response thereto. According to the invention, the laminated spring (18) carries the evaluation electronics (30) whose connections (32) are connected to a section of the laminated spring (18) in an electrically conducting manner. At least one electrical contact (34) is formed onto said section and represents the interface for the connection of electrical components or conducting elements.

Description

Pedal-Vorrichtung für Kraftfahrzeuge Beschreibung Stand der Technik Die Erfindung betrifft eine Pedal-Vorrichtung für Kraftfahrzeuge, beinhaltend einen Stellungsgeber für das Pedal, welcher ein elektrisches, von der Pedalstellung abhängiges Stellsignal erzeugt, sowie eine bei Pedalbetätigung elastisch ver- formbare Federeinrichtung in Form wenigstens einer Blattfeder, in deren Verformungsbereich ein Verformungs- oder Kraftsensor zur Erzeugung eines Verformungs- oder Kraftsignals angeordnet ist, in dessen Abhängigkeit eine Auswerteelektronik das Stellsignal erzeugt, gemäß dem Oberbegriff von Anspruch 1. Eine solche Pedal-Vorrichtung ist beispielsweise aus der DE 40 24 018 A1 bekannt. Pedal device for motor vehicles Description of the prior art The invention relates to a pedal device for motor vehicles, including a position transmitter for the pedal, which generates an electrical control signal dependent on the pedal position, and a spring device in the form of at least one that is elastically deformable when the pedal is actuated Leaf spring, in the deformation region of which a deformation or force sensor for generating a deformation or force signal is arranged, in the dependence of which evaluation electronics generate the actuating signal, according to the preamble of claim 1. Such a pedal device is, for example, from DE 40 24 018 A1 known.
Vorteile der ErfindungAdvantages of the invention
Indem die Blattfeder die Auswerteelektronik trägt, deren Anschlüsse mit einem Abschnitt der Blattfeder elektrisch leitend in Verbindung stehen, an welchen wenigstens ein elektrischer Kontakt als Schnittstelle für den Anschluß elektrischer Bau- oder Leitungselemente angeformt ist, fungiert die einstückige Blattfeder zugleich als Trägerelement der Auswerteelektronik und als signalleitende Verbindung zwischen dieser und dem elektrischen Kontakt, der an sie angeformt ist. Hierdurch reduziert sich die Anzahl der zu montierenden Bauelemente, was sich günstig auf die Fertigungskosten auswirkt. Der mit der Blattfeder einstückige elektrische Kontakt ist vorzugsweise mittels eines Steckers an eine Leitungsver- bindung anschließbar, welche das Stellsignal in ein Motorsteuergerät des Kraftfahrzeugs einsteuert.By the leaf spring carrying the evaluation electronics, the connections of which are electrically conductively connected to a section of the leaf spring to which at least one electrical contact is formed as an interface for the connection of electrical components or line elements, the one-piece leaf spring also functions as a carrier element of the evaluation electronics and as Signal-conducting connection between this and the electrical contact that is molded onto it. This reduces the number of components to be assembled, which has a favorable effect on the manufacturing costs. The electrical contact integral with the leaf spring is preferably connected to a line connection by means of a plug. Connection connectable, which controls the control signal in an engine control unit of the motor vehicle.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im unabhängigen Patentanspruch an- gegebenen Erfindung möglich. Besonders bevorzugt beinhaltet der elektrische Kontakt von einem außerhalb des Verformungsbereichs angeordneten Bereich der Blattfeder endseitig parallel wegragende und in Querrichtung voneinander beabstandete Steckzungen für den elektrischen Stecker. Die Steckzungen sind beispielsweise durch Stanzen der Blattfeder gefertigt. Gemäß einer weiteren Maßnahme ist ein Ende einer Rückstellfederanordnung zur Erzeugung einer der Betätigungskraft am Pedal entgegenwirkenden Rückstellkraft an dem Verformungsbereich der Blattfeder und das andere Ende am Pedal abgestützt. Die Rückstellfederanordnung enthält beispielsweise eine oder mehrere Schraubenfedern. Hierbei ist dem Verformungsbereich der Blattfeder eine vorspringende Aufnahme für die Schraubenfedern angeformt, welche kostengünstig herstellbar ist. Über die Rückstellfederanordnung werden die auf das Pedal wirkenden Betätigungskräfte auf die Blattfeder übertragen und sorgen in deren Verformungsbereich für eine durch den Verformungs- oder Kraftsensor meßbare Verformung oder Belastung der Blattfeder und zur Erzeugung des der Verformung oder der Belastung proportionalen Stellsignals.Advantageous further developments and improvements of the invention specified in the independent patent claim are possible through the measures listed in the subclaims. Particularly preferably, the electrical contact from a region of the leaf spring which is arranged outside the deformation region includes plug tongues for the electrical plug which protrude in parallel at the end and are spaced apart in the transverse direction. The tongues are made, for example, by punching the leaf spring. According to a further measure, one end of a return spring arrangement for generating a return force counteracting the actuating force on the pedal is supported on the deformation region of the leaf spring and the other end is supported on the pedal. The return spring assembly includes, for example, one or more coil springs. A protruding receptacle for the helical springs is molded onto the deformation area of the leaf spring and can be produced inexpensively. The actuating forces acting on the pedal are transmitted to the leaf spring via the return spring arrangement and ensure in their deformation area that the leaf spring is deformed or loaded by the deformation or force sensor and to generate the actuating signal proportional to the deformation or the load.
Vorzugsweise sind die Auswerteelektronik und ein außerhalb des Verformu ngsbereichs und in Nachbarsch aft zum elektrischen Kontakt angeordneter Absch nitt der Blattfeder mittels eines ummantelnden Spritzgußkörpers aus Kunststoff miteinan- der verbunden. Hierdurch wird vermieden, daß die Funktion der Auswertelektronik durch die im Verformungsbereich der Blattfeder stattfindenden Verformungjen beeinflußt wird. Außerdem ist durch den Stoffschluß eine sichere Festlegu ng der Auswerteelektronik an der Blattfeder gegeben, die einfach und kostengünstig realisierbar ist. Durch die benachbarte Anordnung der elektrischen Kontakte und der Auswerteelektronik sind die Leitungswege kurz, mit entsprechend geringer Signalabschwächung. 5 Der Verformungs- oder Kraftsensor wird vorzugsweise durch einen Dehnmeßstreifen gebildet, welcher unter Zwischenordnung einer Isolierschicht an der Blattfeder angebracht ist, um für eine Isolierung des elektrischen Kontakts der Blattfeder gegenüber dem elektrisch leitfähigen Dehnmeßstreifen zu sorgen.The evaluation electronics and a section of the leaf spring which is arranged outside the deformation region and in the vicinity of the electrical contact are preferably connected to one another by means of a sheathing injection molded plastic body. This prevents the function of the evaluation electronics from being influenced by the deformation taking place in the deformation area of the leaf spring. In addition, a secure fixation is due to the material connection Evaluation electronics given on the leaf spring, which is simple and inexpensive to implement. Due to the adjacent arrangement of the electrical contacts and the evaluation electronics, the line paths are short, with a correspondingly low signal attenuation. 5 The deformation or force sensor is preferably formed by a strain gauge which is attached to the leaf spring with the interposition of an insulating layer in order to provide insulation of the electrical contact of the leaf spring with respect to the electrically conductive strain gauge.
Zumindest der Verformungsbereich der Blattfeder überspannt vorzugsweise eine 10 Vertiefung eines Lagerbocks der Pedal-Vorrichtung, wobei zumindest die Enden der Blattfeder im Lagerbock eingespannt sind. Besonders wird hierbei der Lagerbock durch einen Spritzgußformling gebildet, in welchen die Enden der Blattfeder eingegossen sind. Um Schutz gegen korrosive Einwirkung auf die Blattfeder und der mit ihr verbun- 1.5 denen Bauelemente zu bieten, ist die Blattfeder zusammen mit der Auswerteelektronik und dem Verformungs- oder Kraftsensor mit Ausnahme zumindest eines freien Teils des elektrischen Kontakts von einer Schutzschicht ummantelt, welche beispielsweise durch eine Lackschicht oder eine Elastomerschicht gebildet wird.At least the deformation area of the leaf spring preferably spans a depression of a bearing block of the pedal device, at least the ends of the leaf spring being clamped in the bearing block. In particular, the bearing block is formed by an injection molding in which the ends of the leaf spring are cast. In order to provide protection against corrosive effects on the leaf spring and the components connected to it, the leaf spring together with the evaluation electronics and the deformation or force sensor, with the exception of at least a free part of the electrical contact, is covered by a protective layer, which is covered, for example, by a lacquer layer or an elastomer layer is formed.
0 Zeichnungen Ein Ausführungsbeispiei der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. In der Zeichnung zeigt Fig.1 einen Längsschnitt durch eine Pedal-Vorrichtung gemäß einer bevorzugten Ausführungsform mit einer Blattfeder;5 Fig.2 einen Querschnitt durch die Pedalvorrichtung von Fig.1 ; Fig.3 eine schematisierte Längsschnittdarstellung der Blattfeder von Fig.1 ; Fig.4 eine schematisierte Draufsicht auf die Blattfeder von Fig.1.0 drawings An exemplary embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a longitudinal section through a pedal device according to a preferred embodiment with a leaf spring; 5 FIG. 2 shows a cross section through the pedal device from FIG. 1; 3 shows a schematic longitudinal sectional illustration of the leaf spring from FIG. 1; 4 shows a schematic plan view of the leaf spring of FIG. 1.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Die in Fig.1 gezeigte Pedal-Vorrichtung 1 eines Kraftfahrzeugs beinhaltet ein vom Fahrer betätigbares, an einem Lagerbock 2 um eine Schwenkachse 4 schwenkbar gelagertes Pedal 6, von welchen aus Maßstabsgründen nur ein lagerbocknaher Abschnitt gezeigt ist. Die Pedal-Vorrichtung 1 ist über im Lagerbock 2 ausgebildete Befestigungsaugen 8 an einer Karosseriestruktur des Kraftfahrzeugs befestigt, wie insbesondere aus Fig.2 hervorgeht. Bei dem Pedal handelt es sich im vorliegenden Fall um ein stehendes oder hängendes Gaspedal 6, wobei die Anwendung der Erfindung allerdings nicht, auf ein Gaspedal 6 eines Kraftfahrzeugs beschränkt ist. Vielmehr kann sie auch in einem Brems- oder Kupplungspedal umgesetzt werden.The pedal device 1 of a motor vehicle shown in FIG. 1 includes a pedal 6 which can be actuated by the driver and is pivotally mounted on a bearing block 2 about a pivot axis 4, of which only a section near the bearing block is shown for reasons of scale. The pedal device 1 is fastened to a body structure of the motor vehicle via fastening eyes 8 formed in the bearing block 2, as can be seen in particular from FIG. When the pedal is in the present case a standing or hanging accelerator 6, wherein the application of the invention, on an accelerator pedal 6 of a motor vehicle is not limited, however. Rather, it can also be implemented in a brake or clutch pedal.
Das Gaspedal 6 ist durch eine gegen die Betätigungskraft wirkende Rückstellkraft belastet, wobei die Rückstellkraft durch eine Rückstellfederanordnung 10 erzeugt wird, welche zwei koaxiale und ineinander gesteckte Schraubenfedern 12 beinhaltet, von welchen jeweils ein Ende an einer zapfenförmigen Federaufnahme 14 am Gaspedal 6 und das andere Ende an einer vorspringenden Federaufnahme 16 einer sich quer zu den Schraubenfedern 12 erstreckenden und aus einem Fe- derstahl bestehenden Blattfeder 18 aufgenommen und zentriert ist. Die Federaufnahme 16 . befindet sich in einem Verformungsbereich 20 der Blattfeder 18, welcher von dem in Fig.1 rechten Ende 22 aus gesehen etwa ein Drittel einnimmt und eine Vertiefung 24 des Lagerbocks 2 überspannt. Folglich werden die auf das Gaspedal 6 wirkenden Betätigungskräfte über die Schraubenfedern 12 als Quer- kräfte auf die Blattfeder 18 übertragen und sorgen in deren VerformungsbereichThe accelerator pedal 6 is loaded by a restoring force acting against the actuating force, the restoring force being generated by a restoring spring arrangement 10 which contains two coaxial and interleaved coil springs 12, each of which has one end on a pin-shaped spring receptacle 14 on the accelerator pedal 6 and the other end is received and centered on a projecting spring receptacle 16 of a leaf spring 18 extending transversely to the coil springs 12 and consisting of a spring steel. The spring retainer 16. is located in a deformation region 20 of the leaf spring 18, which takes up about a third as viewed from the right end 22 in FIG. 1 and spans a depression 24 in the bearing block 2. As a result, the actuating forces acting on the accelerator pedal 6 are transmitted as transverse forces to the leaf spring 18 via the coil springs 12 and ensure their deformation range
20 für eine Durchbiegung. Dabei können die federspezifischen Parameter, bei- spielsweise die Federrate der Blattfeder 18 und die Überspannweite über die Vertiefung 24 an die jeweiligen Anforderungen angepa ßt werden, beispielsweise derart, daß die maximale Durchbiegung der Blattfeder 1 8 bei voll betätigtem Gaspedal ca. 2 mm beträgt. Zumindest die Enden 22, 26 der Blattfeder 18 sind im Lagerbock 2 eingespannt. Dies kann vorzugsweise dadurch erfolgen, daß der Lagerbock 2 durch -einen Spritzgußformling aus Kunststoff gebildet wird, in den die Enden 22, 26 der Blattfeder 18 eingegossen bzw. eingespritzt werden. Alternativ könnten die Enden 22, 26 der Blattfeder auch zwischen zwei miteinander verspannten Schalen des La- gerbocks 2 geklemmt sein.20 for a deflection. The spring-specific parameters, including for example, the spring rate of the leaf spring 18 and the span over the recess 24 to be adapted to the respective requirements, for example in such a way that the maximum deflection of the leaf spring 1 8 is approximately 2 mm when the accelerator pedal is fully actuated. At least the ends 22, 26 of the leaf spring 18 are clamped in the bearing block 2. This can preferably take place in that the bearing block 2 is formed by an injection molding made of plastic, into which the ends 22, 26 of the leaf spring 18 are poured or injected. Alternatively, the ends 22, 26 of the leaf spring could also be clamped between two shells of the bearing block 2 braced together.
Die Pedal-Vorrichtung 1 beinhaltet außerdem einen Stellungsgeber, welcher ein elektrisches, von der Gaspedalstellung abhängiges Stel Isignal für übergeordnete Steuer- und Regeleinrichtungen des Kraftfahrzeugs liefert, beispielsweise für ein Motorsteuergerät. Hierzu ist im Verformungsbereich 20 der Blattfeder 18 wenig- stens ein Verformungs- oder Kraftsensor 28 zur Erzeugung eines Verformungsoder Kraftsignals angeordnet, in dessen Abhängigkeit eine Auswerteelektronik 30 das Stellsignal erzeugt. Der Verformungs- oder Kraftsensor wird vorzugsweise durch einen an der dem Gaspedal 6 zugewandten Seite der Blattfeder 18 angebrachten Dehnmeßstreifen 28 gebildet, mit dem die Verformung des Verfor- mungsbereichs 20 der Blattfeder 18 bei Betätigung des Gaspedals 6 meßbar ist.The pedal device 1 also includes a position transmitter which supplies an electrical position signal which is dependent on the accelerator pedal position for higher-level control and regulating devices of the motor vehicle, for example for an engine control unit. For this purpose, at least one deformation or force sensor 28 for generating a deformation or force signal is arranged in the deformation region 20 of the leaf spring 18, and an electronic evaluation unit 30 generates the control signal as a function of the latter. The deformation or force sensor is preferably formed by a strain gauge 28 attached to the side of the leaf spring 18 facing the gas pedal 6, with which the deformation of the deformation area 20 of the leaf spring 18 can be measured when the gas pedal 6 is actuated.
Durch die Durchbiegung der Blattfeder 18 wird der Dehnmeßstreifen 28 gestreckt und ändert dadurch seinen elektrischen Widerstand. Aus dieser Widerstandsänderung wird in einer mit dem Dehnmeßstreifen 28 elektrisch verbundenen Auswerteelektronik 30 das Stellsignal erzeugt, das ein Maß für die Größe der Strek- kung des Dehnmeßstreifens 28 und damit ein Maß für die Durchbiegung derThe deflection of the leaf spring 18 stretches the strain gauge 28 and thereby changes its electrical resistance. The control signal is generated from this change in resistance in evaluation electronics 30 which is electrically connected to the strain gauge 28 and which is a measure of the extent of the strain gauge 28 and thus a measure of the deflection of the strain gauge
Blattfeder 1 8 infolge der Betätigung des Gaspedals 6 ist. Die Auswerteelektronik 30 ist im einzelnen nicht dargestellt und Stand der Technik. Beispielsweise kann der Dehnmeßstreifen 28 in einer sog. Vollbrückenschal- tung eingebunden sein, die bei nicht betätigtem Gaspedal 6 abgeglichen, also stromlos ist. Durch die Widerstandsänderung des Dehnmeßstreifens 28 infolge Gaspedalbetätigung wird dieser Abgleich gestört und es fließt im Brückenzweig ein Strom, der ein Maß für die Auslenkung des Gaspedals 6 ist. Anstatt eines Dehnmeßstreifens 28 können auch andere Sensoren verwendet werden, mit welchen die Verformung der Blattfeder 18 bzw. die auf sie wirkende Kraft gemessen werden kann, beispielsweise piezo-elektrische Sensoren. Erfindungsgemäß trägt die Blattfeder 18 die Auswerteelektronik 30. Deren das Stel lsignal übertragende Anschlüsse 32 stehen mit einem Abschnitt der Blattfeder 18 elektrisch leitend in Verbindung, an welchen elektrische Kontaktelemente 34 für den Anschluß eines elektrischen Steckers einer Leitungsverbindung angeformt sind, welche das Stellsignal in ein Motorsteuergerät des Kraftfahrzeugs einsteu- ert. Die elektrischen Kontaktelemente sind vorzugsweise als von dem in Fig.1 linken Ende 26 der Blattfeder 18 parallel wegragende und in Querrichtung voneinander beabstandete Steckzungen 34 ausgebildet, welche in eine Steckerhöhle 36 ragen, in die der Stecker einsteckbar istLeaf spring 1 8 is due to the actuation of the accelerator pedal 6. The evaluation electronics 30 is not shown in detail and is state of the art. For example, the strain gauge 28 can be integrated in a so-called full-bridge circuit, which is calibrated when the accelerator pedal 6 is not actuated, that is to say without current. This adjustment is disturbed by the change in resistance of the strain gauge 28 as a result of accelerator pedal actuation and a current flows in the bridge branch, which is a measure of the deflection of the accelerator pedal 6. Instead of a strain gauge 28, it is also possible to use other sensors with which the deformation of the leaf spring 18 or the force acting on it can be measured, for example piezoelectric sensors. According to the invention, the leaf spring 18 carries the evaluation electronics 30. Their connections 32, which transmit the actuating signal, are electrically conductively connected to a section of the leaf spring 18, on which electrical contact elements 34 for the connection of an electrical plug of a line connection are formed, which transmit the actuating signal to an engine control unit of the motor vehicle. The electrical contact elements are preferably designed as plug tongues 34 projecting parallel from the left end 26 of the leaf spring 18 in FIG. 1 and spaced apart in the transverse direction, which protrude into a plug cavity 36 into which the plug can be inserted
Die Auswerteelektronik 30 ist in unmittelbarer Nachbarschaft zu den Steckzungen 34 und außerhalb des Verformungsbereichs 20 der Blattfeder 18 angeordnet. Sie ist m it der Blattfeder 18 durch einen beide Bauteile zumindest teilweise umschließenden Spritzgußkörper 38 aus Kunststoff verbunden, d.h. die Auswerteelektronik 30 wird auf der dem Gaspedal 6 zugewandten Seite der Blattfeder 18 platziert und anschließend mit Spritz-Kunststoff umgössen bis ein Spritzgußkörper 38 ge- bildet ist, welcher die Auswerteelektronik 30 vollständig ummantelt (Fig.3), so daß beide Bauteile 18, 30 stoffschlüssig miteinander verbunden sind. Weiterhin ist ein zur Auswerteelektronik 30 weisender Abschnitt 40 der Steckzungen 34 in den Spritzgußkörper 38 eingegossen, welcher im übrigen die Auswerteelektronik 30 allseits überragt.The evaluation electronics 30 is arranged in the immediate vicinity of the tabs 34 and outside the deformation area 20 of the leaf spring 18. It is connected to the leaf spring 18 by an injection-molded body 38 made of plastic, which at least partially surrounds both components, ie the evaluation electronics 30 are placed on the side of the leaf spring 18 facing the accelerator pedal 6 and then molded with injection-molded plastic until an injection-molded body 38 is formed which completely encases the evaluation electronics 30 (FIG. 3), so that both components 18, 30 are integrally connected to one another. Furthermore, a section 40 of the tongues 34 facing the evaluation electronics 30 is shown in FIGS Injection molded body 38 is cast in, which in all other respects projects beyond the evaluation electronics 30.
Die Steckzungen 34 sind beispielsweise durch Stanzen der Blattfeder 18 gefertigt. Um einen Kurzschluß zwischen den verschiedenen Anschlüssen 32 der Aus- werteelektronik zugeordneten Steckzungen 34 zu vermeiden, sind diese zunächst durch in den Figuren nicht gezeigte Querstege miteinander verbunden. Nach dem teilweisen Eingießen der Steckzungen 34 in den Spritzgußkörper 38 werden diese Querstege entfernt, so daß die Steck-zungen 34 auch durch den Stoffschluß des Spritzgußkörpers 38 gehalten sind. Um für eine Isolierung der signalführenden Steckzungen 34 von dem elektrisch leitfähigen Dehnmeßstreifen 28 zu sorgen, ist dieser unter Zwischenordnung einer Isolierschicht 42 an der Blattfeder 1.8 angebracht (Fig.3). Zwischen der Auswerteelektronik 30 und dem Dehnmeßstreifen 28 sind elektrische Leitungsdrähte 44 verlegt, welche mit den entsprechenden Anschlüssen 32 durch Löten, Bonden oder Schweißen verbunden sind.The tongues 34 are manufactured, for example, by stamping the leaf spring 18. In order to avoid a short-circuit between the different connections 32 of the plug-in tongues 34 assigned to the evaluation electronics, these are first connected to one another by transverse webs not shown in the figures. After the partial pouring of the tongues 34 into the injection molded body 38, these crosspieces are removed, so that the tongues 34 are also held by the material connection of the injection molded body 38. In order to insulate the signal-carrying tongues 34 from the electrically conductive strain gauge 28, the latter is attached to the leaf spring 1.8 with the interposition of an insulating layer 42 (FIG. 3). Between the evaluation electronics 30 and the strain gauge 28, electrical lead wires 44 are laid, which are connected to the corresponding connections 32 by soldering, bonding or welding.
Folglich trägt die Blattfeder 18 den Dehnmeßstreifen 28, die Leitungsdrähte 44 zwischen dem Dehnmeßstreifen 28 und der Auswerteelektronik 30, und Letztere selbst. Weiterhin wirkt die Blattfeder 18 als Abstützelement für die Rückstellfederanordnung 10 des Gaspedals 6. Schließlich sind ihr Steckzungen 34 zur Übertra- gung der Signale der Auswerteelektronik 30 mittels einer Steckverbindung angeformt. Folglich bildet die Blattfeder 18 zusammen mit den an ihr gehaltenen Bauelementen 28, 30, 44 ein vormontierbares und multifunktionales Blattfeder-Modul 46, welches am Lagerbock 2 im Ganzen montierbar und in seiner Gesamtheit in Fig.3 und Fig.4 gezeigt ist. Um dieses Blattfeder-Modul 46 vor Verschmutzung, Korrosion oder anderen äußeren Einwirkungen zu schützen, ist es mit Ausnahme der frei zu haltenden Steckzungen 34 von einer Schutzschicht ummantelt, welche beispielsweise durch eine Lackschicht oder eine thermoplastische, aufgespritzte Elastomerschicht. Consequently, the leaf spring 18 carries the strain gauge 28, the lead wires 44 between the strain gauge 28 and the evaluation electronics 30, and the latter itself. Furthermore, the leaf spring 18 acts as a supporting element for the return spring arrangement 10 of the accelerator pedal 6. Finally, its tabs 34 are for transmitting the Signals of the evaluation electronics 30 are formed by means of a plug connection. Consequently, the leaf spring 18 together with the components 28, 30, 44 held on it forms a preassembled and multifunctional leaf spring module 46, which can be mounted on the bearing block 2 as a whole and is shown in its entirety in FIGS. 3 and 4. In order to protect this leaf spring module 46 from dirt, corrosion or other external influences, it is covered with a protective layer, with the exception of the tabs 34 to be kept free, which for example through a layer of lacquer or a thermoplastic, sprayed on elastomer layer.

Claims

Patentansprüche 1. Pedal-Vorrichtung (1 ) für Kraftfahrzeuge, beinhaltend einen Stellungsgeber (28, 30) für das Pedal (6), welcher ein elektrisches, von der Pedalstellung abhängiges Stellsignal erzeugt, sowie eine bei Pedalbetätigung elastisch verformbare Federeinrichtung in Form wenigstens einer Blattfeder (18), in deren Verformungsbereich (20) ein Verformungs- oder Kraftsensor (28) zur Erzeugung eines Verformungs- oder Kraftsignals angeordnet ist, in dessen Abhängigkeit eine Auswerteelektronik (30) das Stellsignal erzeugt, dadurch gekennzeichnet, daß die Blattfeder (18) die Auswerteelektronik (30) trägt, deren Anschlüsse (32) mit einem Abschnitt der Blattfeder (18) elektrisch leitend in Verbindung stehen, an welchen wenigstens ein elektrischer Kontakt (34) als Schnittstelle für den Anschluß elektrischer Bau- oder Leitungselemente angeformt ist.1. Pedal device (1) for motor vehicles, comprising a position transmitter (28, 30) for the pedal (6), which generates an electrical control signal dependent on the pedal position, and an elastically deformable spring device in the form of at least one leaf spring when the pedal is actuated (18), in the deformation region (20) of which a deformation or force sensor (28) for generating a deformation or force signal is arranged, depending on which evaluation electronics (30) generate the control signal, characterized in that the leaf spring (18) the Evaluation electronics (30) carries, whose connections (32) are electrically conductively connected to a section of the leaf spring (18) on which at least one electrical contact (34) is integrally formed as an interface for the connection of electrical components or line elements.
2. Vorrichtung, nach Anspruch 1 , dadurch gekennzeichnet, daß der elektrische Kontakt von einem außerhalb des Verformungsbereichs (20) angeordneten Bereich der Blattfeder (18) endseitig parallel wegragende und in Querrichtung voneinander beabstandete Steckzungen (34) für einen elektrischen Stecker beinhaltet.2. Device according to claim 1, characterized in that the electrical contact from an outside of the deformation region (20) arranged area of the leaf spring (18) includes parallel end projecting and transversely spaced tabs (34) for an electrical connector.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Steckzungen (34) durch Stanzen der Blattfeder (18) gefertigt sind. 3. Apparatus according to claim 2, characterized in that the tongues (34) are made by punching the leaf spring (18).
4. Vorrichtung nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein Ende einer Rückstellfederanordnung (10) zur Erzeugung einer der Betätigungskraft am Pedal (6) entgegenwirkenden Rückstellkraft an dem Verformungsbereich (20) der Blattfeder (18) und das andere Ende am Pedal (6) abgestützt ist.4. The device according to at least one of the preceding claims, characterized in that one end of a return spring arrangement (10) for generating a restoring force counteracting the actuating force on the pedal (6) on the deformation region (20) of the leaf spring (18) and the other end on the pedal (6) is supported.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß dem Verformungsbereich (20) der Blattfeder (18) eine vorspringende Federaufnahme (16) für die Rückstellfederanordnung (10) angeformt ist.5. The device according to claim 4, characterized in that the deformation region (20) of the leaf spring (18) has a projecting spring receptacle (16) for the return spring arrangement (10) is formed.
6. Vorrichtung nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Auswerteelektronik (30) und ein außerhalb des Verformungsbereichs (20) und in Nachbarschaft zum elektrischen Kontakt (34) angeordneter Abschnitt der Blattfeder (18) mittels eines ummantelnden Spritzgußkörpers (38) aus Kunststoff miteinander verbunden sind.6. The device according to at least one of the preceding claims, characterized in that the evaluation electronics (30) and a portion of the leaf spring (18) arranged outside the deformation region (20) and in the vicinity of the electrical contact (34) by means of a sheathing injection-molded body (38) are connected together from plastic.
7. Vorrichtung nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Verformungs- oder Kraftsensor durch wenigstens einen Dehnmeßstreifen (28) gebildet wird, welche unter Zwischenordnung einer Isolierschicht (42) an der Blattfeder (18) angebracht ist.7. The device according to at least one of the preceding claims, characterized in that the deformation or force sensor is formed by at least one strain gauge (28) which is attached to the leaf spring (18) with the interposition of an insulating layer (42).
8. Vorrichtung nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zumindest der Verformungsbereich (20) der Blattfeder (18) eine Vertiefung (24) eines Lagerbocks (2) des Pedals (6) überspannt. 8. The device according to at least one of the preceding claims, characterized in that at least the deformation region (20) of the leaf spring (18) spans a recess (24) of a bearing block (2) of the pedal (6).
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß zumindest die Enden (22, 26) der Blattfeder (18). im Lagerbock (18) eingespannt sind.9. The device according to claim 8, characterized in that at least the ends (22, 26) of the leaf spring (18). are clamped in the bearing block (18).
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß der Lagerbock (18) durch einen Spritzgußformling gebildet wird, in den die Enden (22, 26) der Blattfeder eingegossen oder eingespritzt sind.10. The device according to claim 9, characterized in that the bearing block (18) is formed by an injection molding, in which the ends (22, 26) of the leaf spring are poured or injected.
11. Vorrichtung nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Blattfeder (18) zusammen mit der Auswerteelektronik (30) und dem Verformungs- oder Kraftsensor (28) mit Ausnahme wenigstens eines freien Teils des elektrischen Kontakts (34) von einer Schutzschicht ummantelt ist. 11. The device according to at least one of the preceding claims, characterized in that the leaf spring (18) together with the evaluation electronics (30) and the deformation or force sensor (28) with the exception of at least a free part of the electrical contact (34) of a protective layer is encased.
PCT/DE2004/001510 2003-09-08 2004-07-10 Pedal device for motor vehicles WO2005026861A2 (en)

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EP2818444A1 (en) * 2013-06-25 2014-12-31 STILL GmbH Mobile working machine with brake actuator
WO2018046394A1 (en) * 2016-09-06 2018-03-15 HELLA GmbH & Co. KGaA Pedal, in particular accelerator pedal
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US11953931B2 (en) 2022-02-14 2024-04-09 KSR IP Holdings, LLC Pedal assembly having force sensing

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