Abstract:
An electronic data recorder including an electronic data storage device disposed within an enclosure having a main housing and a cover adapted to engage a base region of the housing. The main housing forms a cavity housing the electronic data storage device. A mounting wall extending from the main housing and including an attachment foot for attachment to a vehicle wherein an impact during a vehicle crash preferentially fractures one or both the mounting wall and attachment foot as opposed to the main housing.

Description:
BACKGROUND 
       [0001]    The present disclosure relates to a electronic data recorder mounted on a vehicle, such as an automotive vehicle. The recorder can store at least acceleration data of the vehicle prior to, during, and after a traffic accident. 
         [0002]    As an example of representative apparatus for storing data at a traffic accident occurrence time, a flight data recorder mounted on an aircraft is well known. The flight recorder for an aircraft receives and records data such as the speed and acceleration of the aircraft through wires from hydraulic cylinders, the speed indicator and other sensors, while the aircraft is flying. However, because an aircraft flight recorder is a very large scale apparatus, it is not practical to apply such a system to automotive vehicles because of the complex mounting requirements, cost, etc. 
         [0003]    Nonetheless, in order to investigate the cause of an automotive accident, it is advantageous to know the condition, or state of an automotive vehicle at the time a traffic accident has occurred involving the vehicle. In a traffic accident involving the vehicle, it is advantageous to analyze data, such as, acceleration, angular velocity, etc., at the accident occurrence time, in order to look into the cause of the accident. This information is most readily stored in an electronic condition. 
         [0004]    Unfortunately, most electronic data recorders are susceptible to damage from environmental factors. This is particularly true for an electronic data recorder that has experienced accident conditions. The present disclosure is focused upon a suitable enclosure to protect an electronic data storage device and maintain its environmental isolation, and therefore its integrity, both before and after a crash. 
       BRIEF DESCRIPTION 
       [0005]    Various details of the present disclosure are hereinafter summarized to provide a basic understanding. This summary is not an extensive overview of the disclosure, and is intended neither to identify certain elements of the disclosure, nor to delineate the scope thereof. Rather, the primary purpose of this summary is to present some concepts of the disclosure in a simplified form prior to the more detailed description that is presented hereinafter. 
         [0006]    According to a first embodiment, an automotive vehicle including an electronic data storage device and an enclosure for protecting the device is provided. The enclosure comprises a first wall, a sidewall engaging the first wall and in cooperation with the first wall forming a cavity that receives the electronic storage data device. A cover is configured to matingly engage the sidewall and seal one side of the cavity. A mounting wall extends from a first end of the sidewall and is juxtaposed relative to the side wall with a gap being formed between the sidewall and the mounting wall. The mounting wall includes at least two feet adapted to engage the vehicle which are located distally to a point of engagement with the sidewall. 
         [0007]    According to a second embodiment, a method for enclosing and protecting an electronic data storage device is provided. The method includes the steps of providing an enclosure comprised of a main housing and a cover adapted to engage a base region of the housing. The main housing forms a cavity. A mounting wall extends from the main housing remote from the base region. The mounting wall includes at least one foot adapted for attachment to a surface. The electronic data storage device is located within the cavity and the cover is secured to the main housing. The enclosure is then secured to a surface via the at least one foot, wherein an impact force on the enclosure preferentially fractures one or both of the mounting wall and the foot as opposed to the main housing. 
         [0008]    According to a third embodiment, an electronic data recorder is provided. The electronic data recorder includes an electronic data storage device disposed in an enclosure comprised of a housing having a top wall and a side wall depending from an edge of the top wall, the top wall and the side wall form a cavity configured to receive the electronic data storage device. The housing further includes a mounting wall having a first portion extending coplanar outwardly to the top wall and a second portion extending downwardly from the first portion at least substantially parallel to the sidewall. The second portion extends below the sidewall and includes a foot oriented and at least generally perpendicular o the second portion. A cover mates with the housing and seals the cavity. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    The following description and drawings set forth certain illustrative implementations of the disclosure in detail, which are indicative of several exemplary ways in which the various principles of the disclosure may be carried out. The illustrated examples, however, are not exhaustive of the many possible embodiments of the disclosure. Other objects, advantages and novel features of the disclosure will be set forth in the following detailed description of the disclosure when considered in conjunction with the drawings, in which: 
           [0010]      FIG. 1  is a perspective view showing an electronic data storage device mounted on an automotive vehicle; 
           [0011]      FIG. 2  is a bottom perspective view of the electronic data storage device of  FIG. 1 ; 
           [0012]      FIG. 3  is a bottom perspective view showing the device of  FIG. 2  with the cover, PCB, and connector module removed; and 
           [0013]      FIG. 4  is an upright sectional view of  FIG. 2  taken along line  4 - 4 . 
       
    
    
     DETAILED DESCRIPTION 
       [0014]    With reference to  FIG. 1 , the cable area  10  of an automotive vehicle is shown including an electronic data recorder  12 . The electronic data recorder  12  includes a main housing  14  mounted to the vehicle floor  16 . The vehicle floor underlying a passenger seat is one suitable location. Of course, the electronic data recorder  12  can be located in various locations within the automotive vehicle. Main housing  14  defines a cavity  18  within which a connector module  20  having ports  20 A and  20 B is disposed. Connector module  20  receives the connector of a wiring harness (not shown) which is in electrical communication with the various sensors and other data origination devices being recorded. The wiring harness connector can be shaped and sized and optionally gasketed to form a water-tight seal with the walls  21  of connector module  20 . 
         [0015]    Connector module  20  resides upon and in electrical communication a with printed circuit board (PCB)  22  hosting a data recordation means such as an electronic data storage device, which in this case can be a semiconductor memory or a magnetic recorder or the like. As an alternative to a PCB, a conductive foil including semiconductor or magnetic storage elements could be employed. PCB  22  is retained by a cover  24 . 
         [0016]    The electronic data storage device typically can measure multiple information sources. However, acceleration and angular velocity are two of the most important. 
         [0017]    Generally, when a vehicle is engaged in a traffic accident, it is quickly braked or, without quick braking, it rapidly decelerates when it crashes against or collides with something, or something collides with it from behind. Therefore, if the acceleration and angular velocity of the vehicle have been recorded, it is possible to know with their rapid changes when the traffic accident occurred. The electronic data storage device records acceleration data and, possibly, angular velocity data of a vehicle during a predetermined time period before and after an accident occurrence time. 
         [0018]    The acceleration data show the speed changes of the vehicle at the accident occurrence time, and one can know from the data the magnitude of the shock of collision or crash, for example. The acceleration data is measured by an acceleration measurement means, for at least the traveling direction of a vehicle and, if necessary, the other directions than the traveling direction in the three-dimensional space. The measurement is carried out, at least substantially, constantly while the vehicle is running. As the acceleration measurement means, acceleration sensors of various types may be used, such as the strain gage type, capacitance type, piezoelectric type and differential transformer type. The acceleration measured by the acceleration measurement means is output as acceleration data to the electronic data storage device. 
         [0019]    The angular velocity data show the changes in direction or position of the vehicle at the accident occurrence time, and one can know from the data how the direction of the vehicle has changed at the accident occurrence time. The angular velocity data are measured by the angular velocity measurement means, on the angular velocity about at least one direction in the three-dimensional space and, if necessary, on the angular velocity about the other directions. This measurement is also carried out, at least substantially, constantly while the vehicle is running. As the angular velocity measurement means, various commercial angular velocity sensors may be used. The angular velocity measured by the angular velocity measurement means are output as angular velocity data. 
         [0020]    The acceleration data output from the acceleration measurement means and the angular velocity data output from the angular velocity measurement means are stored by the electronic data storage device. 
         [0021]    In the electronic data storage device storing the acceleration data and, optionally, the angular velocity data before and after a traffic accident occurrence time, the storage means constantly stores the acceleration data and angular velocity data. This recording is carried out endlessly; accordingly, new data replace old data in order at regular intervals. Driving time data is preferably retained to facilitate recreation of a driving pattern prior to a crash. For example, in a frontal or side air bag deployment crash, the electronic data storage device will capture and record the deployment data for up to two events. The memory for each event can be locked to prevent future overwriting of the data. Specific Department of Transportation guidelines can be found at 49 CFR Part 563. 
         [0022]    When a predetermined value has been exceeded by the acceleration data obtained by the acceleration measurement means or the angular velocity data obtained by the angular velocity measurement means, it can be assumed that an accident has occurred and the acceleration data and angular velocity data are stopped from being stored in the electronic data recorder. Moreover, the data recorded at the time of the incident is retained and not overwritten. 
         [0023]    A traffic accident reproduction system can analyze the acceleration and angular velocity of the vehicle taken out of the electronic data recorder and predict the details of the traffic accident. A traffic accident reproduction system may be constructed to visually reproduce on, for example, a display screen the speed and direction of the vehicle which has encountered the accident, according to the acceleration and, if available, the angular velocity. This allows a cause to be predicted. 
         [0024]    The data stored on the electronic data storage device should be retrievable for at least 10 days following a crash. This is set forth in FMVSS EDR Regulations (208, 214). In this regard, it is highly desirable to provide a housing for the electronic data storage device that remains structurally intact during an impact. In this regard, the phrase “structurally intact” is intended to mean that stored data is not compromised. 
         [0025]    With reference to  FIGS. 2-4 , the electronic data recorder  12  includes a housing  14  formed of an upper wall  23  and a side wall  25  forming a cavity  18 . Connector module  20  resides within cavity  18 . Connector module  20  includes connection cards  21  and alignment/retention elements  23 A, B and C to facilitate a secure and accurate mating between the connector module  20  and the wiring harness connector. 
         [0026]    PCB  22  resides within cavity  18  and is retained therein by the cover  24 . Cover  24  can be secured to the housing  14  via any means known in the art including threadedly, adhesively, or by a retaining means including screws, clips, etc. Screws  26  are shown in  FIG. 2 , which are received in bored posts  28  (see  FIG. 3 ) which can be integrally cast or molded components of the housing  14 . As shown, cover  24  extends past side wall  25  and mates with a cooperatively shaped flange  29  forming an edge of the mounting wall  32 . It is also feasible for the cover to terminate adjacent an overlapping position with side wall  25 . In addition, if cover  24  extends past sidewall  25 , it could be directly connected laterally via adhesive, thread or screws, as examples, to mounting wall  32 . 
         [0027]    Referring specifically to  FIG. 4 , outer mounting wall  32  extends from an edge  30  of upper wall  23  in a first radial dimension  34  and a second overlapping parallel dimension  36 . In this manner, a gap  38  is formed between sidewall  25  and mounting wall  32 . Accordingly, if electronic data recorder  12  absorbs impact during an automotive vehicle accident, there is a preferential breaking of mounting wall  32  as opposed to side wall  25 . In this manner, an environmental barrier is retained around the electronic data storage device (PCB)  22  even subsequent to an accident. 
         [0028]    Mounting wall  32  is integrally formed to include a plurality of feet  40  which are utilized to form a mating surface with the location on the automotive vehicle to which the electronic data recorder  12  is being secured. Moreover, feet  40  include passages  42  suited for accommodating a screw or bolt. While two feet  40  and a mounting tab  44  are depicted, any number and arrangement is feasible. As shown, mounting wall  32  and/or feet  40 , extend beyond the side wall  25  and cover  24 , such that there is a preferential breaking of feet  40  if electronic data recorder  12  is impacted during a traffic accident. 
         [0029]    It is noted that mounting wall  32  is not necessarily a contiguous body. Rather, it is feasible that mounting wall  32  is discontinuous in areas between feet and mounting tabs. 
         [0030]    Moreover, in accord with the design, impact upon the electronic data recorder  12  has been found to provide a preferential fracture zone  46  such that the upper wall  23 , and side wall  25  retaining their physical integrity. Electronic data storage device (e.g. PCB or electronics deposited on foil) remains secured and protected within cavity  18 . The housing  14  is most typically a die cast body comprised of an alloy including iron and at least one of zinc, aluminum, magnesium, copper, lead, tin and mixtures thereof. 
         [0031]    To assemble, the electronic data recorder  12  can have connector module  20  positioned within cavity  18 , with a retaining tab  48  overlapping the extending lip of the connector module  20 . Thereafter, PCB  22  can be mounted to the connector module  20 , wherein suitable pre-arranged surface electrical connections have been provided between the outer surface of the connector module  20  and the PCB  22  and through-hole soldering used to join the components. Cover  24  is then secured to the housing  14  to retain PCB  22  in electrical contact with the connector module  20 , preferentially in a water-tight condition. The electronic data recorder can then be secured via feet  40  to an automotive vehicle surface and a wire harness connector inserted into the connector module  20 . 
         [0032]    The exemplary embodiment has been described with reference to the preferred embodiments. Obviously, modifications and alterations will occur to others upon reading and understanding the preceding detailed description. It is intended that the exemplary embodiment be construed as including all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.