Abstract:
A multi-use wayside railway control system for installation and use in operating wayside railway equipment in a railway wayside application selected from among a plurality of differing railway wayside applications usable in the control system. The system includes detectors responsive to and generating data indicative of operating conditions of the selected wayside application A controller receives data from the detectors and is responsive to the data for operating the wayside equipment. A programmed processor associated with the controller includes a software program storage device for storing a plurality of separately selectable operating programs, each of the operating programs comprising application specific information for a selected wayside application and corresponding configuration of wayside equipment. A control display unit enables selection of one of the stored operating programs compatible with the selected wayside application and corresponding wayside equipment configuration for use by the controller.

Description:
SPECIFIC DATA RELATED TO THE INVENTION 
   This application claims the benefit of U.S. provisional application No. 60/541,437, filed Feb. 3, 2004. 

   FIELD OF THE INVENTION 
   This invention relates generally to the field of railway equipment, and more particularly to railway wayside equipment and control systems adapted for application specific in situ configuration 
   BACKGROUND OF THE INVENTION 
   Railway control equipments, such as wayside signaling equipment, wayside crossing equipment, and wayside interlocking equipment, are individually controlled in a manner to assure that operation of the equipment is suitable for the characteristics and configuration of the application. For example, crossing equipment such as warning lights, warning bells and crossing arms are actuated at different advance distances of an approaching rail vehicle depending upon the speed limit on the railway and the configuration of the crossing, i.e., whether it is single or multiple track crossing and the speed of rail vehicles on the tracks. The control equipment typically includes electronic controllers that are programmed to respond to rail vehicle detectors and actuate the appropriate control equipment, such as by turning on flashing warning lights and lowering crossing arms. The controllers are also used with other wayside equipment such as railway switches to switch rail vehicles to other railways or tracks. The controllers may also control signal lights along the railway which indicate the presence of proximity of a rail vehicle with respect to a defined section or block of railway. 
   The controllers control the basic functions of the equipment, such as the basic operation of lowering and raising of a crossing gate, in response to programmed information stored in a program storage device such as an erasable programmable read only memory (EPROM) or electrically EPROM (EEPROM). The controllers have unique programs for each application in the form of the equipment to be controlled and the operating environment, such as a timing of a gate lowering upon approach of a train, which may be different depending on where the equipment is located within the railway system, the topography of the crossings, the nature of the railroad tracks (i.e., single or double tracks), the type and age of the equipment at the crossing, etc. Similar domain specific requirements are present for the other types of wayside equipment. 
   Each of the controllers generally include memory devices, such as EPROMs, for storing respective executive control information and application control information. Executive control information is associated with an executive circuit EPROM that may be programmed with control information common to all of a certain type of equipment, such as all crossing equipment. However, application control information is associated with an application circuit EPROM that typically needs to be programmed with a unique configuration program specifically tailored for a certain application, i.e., an application specific program. Consequently, each type of controller in a railway system may have the same executive EPROM, but each respective controller requires a uniquely programmed application EPROM tailored to a desired application, depending, for example, on how the controller is to be deployed in an installation in a railway system. In the past, quantities of EPROMs were programmed with application specific programs at the railroad company service depot and then provided to installers in batches. Installers of the control equipment, who are not programmers, with a selection of these pre-programmed EPROMs then have the task of picking an EPROM from the selection that has the right program for the specific application of the controller. The ability to make this proper selection is dependent on the information available to the installer to identify the particular EPROM that meets the application requirements. The physical size of the EPROM package limits the amount of written information that can be provided with the EPROM thus making it difficult for the installer to confirm that he/she has selected the correctly programmed EPROM for the particular application. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be more apparent from the following description in view of the drawing that shows: 
       FIG. 1  illustrates an exemplary wayside equipment system; 
       FIG. 2  illustrates a railway equipment controller for use with the present invention; 
       FIG. 3  is a block diagram of a system for consolidating different railway equipment configuration programs into an EPROM; 
       FIG. 4  depicts an exemplary EPROM image format for storing different programs in EPROM memory; and 
       FIG. 5  is a block diagram of a configuration system for selecting desired programs from an EPROM. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 1  illustrates an example of a wayside equipment installation in the form of a detection and warning system for a rail crossing  10 . The crossing  10  is formed by a railway (or track)  12  intersecting a roadway  14 . A road vehicle  16  is shown on roadway  14  approaching the crossing  10  and a rail vehicle  18  is shown on railway  12  also approaching the crossing. A protective enclosure  20  is located near the crossing for housing a controller for operating the crossing gates  22 , signal warning alarm  24  and warning lights  26 . 
   As shown in  FIG. 2 , enclosure  20  houses a controller  28 , rail vehicle detector  30  and communication interface  32 . These elements are well known in the art and function to detect the presence of a rail vehicle and the approach of a rail vehicle toward the crossing  10  and passage of the rail vehicle beyond the crossing. The controller  28  operates the crossing gates  22 , warning audio alarm  24  and warning lights  26 . Typically, each controller  28  includes a data processor responsive  34  to executive programs stored in a program storage device  36 , which device  36  also includes application specific operating parameters or information used by the executive operating program to control the crossing equipment, i.e., bells, lights and crossing arms, in a manner appropriate to that particular crossing. Typically, the devices  30 ,  32 ,  34 , and  36  are all categorized as a part of the controller  28 . While prior systems required different program storage devices for each application, the present invention utilizes a common program storage device incorporating a plurality of different operating program configurations and a control program to allow concatenating the plural programs for individual selection as required for a specific application, such as the crossing  10 . In one form, a control display unit (CDU)  38  is connected to controller  28  to allow selection of an appropriate one of the plurality of different operating programs. 
   As discussed above, each site-specific configuration typically requires a unique application program to control the equipment. A set of common application pre-programmed programs can be developed to cover most configurations of the equipment. For example, a set of 30 such applications may be sufficient to approximate most configurations of crossing equipment anywhere within a rail system. This invention includes a system and method for providing an EPROM that may support different configurations of railway control equipment. The EPROM may be programmed to include different application programs from which a desired configuration program as, appropriate approximation for a specific installation, may be selected when the equipment is installed and operating. In an aspect of invention, different application programs for different equipment that may be controlled by an integrated controller, such as an IWP, may be incorporated in a single application EPROM that includes control information for this set of approximate configurations of the respective equipment. Advantageously, the complexity and the effort required to program the application EPROM of this invention is reduced compared to the prior art technique of uniquely programmed EPROMS required for supporting the railway control equipment used in conventional equipment. While an EPROM memory storage device is described herein, other memory storages devices may be used to practice the invention, such as FLASH memories. 
     FIG. 3  is a block diagram of a system  40  for consolidating different railway equipment programs into program storage device  36  which may be an EPROM. Generally, the system  40  includes a program source  42  for developing application programs to control railway equipment, and a program consolidator  44  for allowing selection of appropriate programs and concatenation of selected programs to be stored in the memory device  36 . In an aspect of the invention, each application program may include controller configuration information. For example, a set of application programs developed for general configurations of a certain type of equipment may be selected, and the resulting application program may be used universally in that type of domain setting (i.e., operating environment and equipment combination). The device or EPROM  36  may be encoded with programs specifically tailored for a unique application of equipment in a specific installation. The program consolidator  44  may also be configured to compress the selected programs to reduce the amount of storage space required to store the programs and to provide error-correcting information, such as by storing redundant information, or by including cyclic redundancy check (CRC) information. In addition, the program consolidator  44  may be configured to provide an indication of the format of the EPROM  36 , and to provide an indication of the number and/or types of programs stored in the application EPROMS. The program consolidator  44  assembles the desired programs and other desired information into an EPROM image for encoding in the EPROM  36 . A memory device programmer, such as an EPROM programmer  46 , in communication with the program consolidator  44 , receives the EPROM image and copies or “burns” the image into the EPROM  36  installed in the programmer  46  typically as a binary image file. 
     FIG. 4  depicts an exemplary EPROM image format  48  for storing different programs in the EPROM  36 . For example, the program consolidator  44  may format the desired information to be stored in the EPROM  36 . The EPROM image format  48  may include a header  50  and CRC data  52 . The image format  48  may also include at least two concatenated programs  54  that may have subheaders  56  associated with each of the programs  54 . 
     FIG. 5  is a block diagram of a configuration system  60  for selecting desired programs from an EPROM  36 , for example, installed in a piece of railway equipment such as shown at  20  in  FIG. 2 . Generally, the configuration system  60  may include an EPROM  36  in communication with a configuration or program selection circuit  62  in communication with the equipment in which the configuration system  60  is installed. The program selection circuit  62  may be in communication with a control interface  64 , that may include a display  66  for allowing a user, such as an installer or technician, to view configuration information stored in the EPROM  36 , and a keypad  68  for selecting desired configuration programs. The display and keypad may be part of the CDU  38 . The program selection circuit  62  may be configured to determine what configuration programs are present in the EPROM, to decompress the programs if required, and to allow the user to select desired configuration programs for configuring the equipment. In another aspect, the program selection circuit  62  may be remotely controllable via the control interface  64 , such as over a hardwired link, such as an Internet connection, a radio frequency (RF) link, or an infrared (IR) link to allow remote selection of desired configuration programs. Advantageously, in a consolidated equipment application, a user can program the configuration of each of the component pieces of equipment controlled by the consolidated equipment from a central control point, instead of having to individually configure a controller from a site located at each piece of equipment. 
   By using the above described system and method, an inventory of application EPROMS may be reduced compared to maintaining a large inventory of uniquely programmed EPROMS as is required conventionally. By encoding multiple applications in a single EPROM, fewer separate EPROM versions may need to be maintained and tracked by the railroad. For example, an application EPROM supporting 30 configurations reduces the inventory from 30 different versions of an EPROM to one version. 
   In another aspect, updating or revising configurations on-site may be more easily accomplished. For example, if a railroad desires to configure a signaling system to support higher speeds during the summer, when the weather is conducive to higher speeds (such as relatively good visibility), but support lower speeds during the winter when visibility might be impaired, a summer configuration program and a winter configuration program may be stored on one EPROM to allow easier conversion from one program to the other. In an aspect of the invention, the configuration program may be converted by selecting the desired program at the CDU  38  or remotely. In the past, such conversions required either replacing the EPROM with the appropriate EPROM programmed to have a different desired configuration. In yet another aspect, on-site installation configuration may be simplified by being able to select an appropriate approximation program from among a set of approximation programs stored in the EEPROM, eliminating much of the manual programming required to change configuration parameters in conventional equipment. In still another aspect, the EPROM may be electrically programmable/field erasable for ease in adding to or changing the programs stored in the EPROM. 
   Configuration management of programs installed in the field may be improved, for example, by allowing the configuration system  60  to indicate what application is currently being used. For example, such an indication may be provided on the display  66 , printed out, or transmitted to receiver for record keeping. This may reduce the demands to maintain configuration control over multiple EPROMS that might need to be seasonally installed in a piece of equipment. Instead, only one EPROM incorporating multiple configuration programs is required and the appropriate configuration for the equipment may be selected from among the programs stored in that EPROM. In another aspect, to ensure safe operation of the equipment, the programs stored in the EPROM may retain some functions that are not user changeable on-site. This provides an installation site designer a capability to limit the changes that may be made during installation of the equipment to only specified parameters that are allowed to be changed. In a further aspect, a user may be allowed to make certain changes, but the changes may be limited, for example, to specific ranges of selections. For instance, an approach distance value selection may be limited to a range between 2000 and 3000 feet, rather than values outside this range. 
   In the past, to provide field configurability, one application EPROM may have been encoded to provide different configurations depending on how certain inputs, such as enable inputs, were wired to the EPROM. On-site, these inputs were wired to a certain state to achieve a desired configuration. Using an innovatively programmed EPROM supporting multiple configurations, time consuming field parameter setup may be reduced in that the pre-programmed approximation programs are also pre-tested, so that only the additional programming requires testing as part of the installation. In addition, design and testing times may be reduced, as only a new program needs to be tested, instead of having to test a new program and all configurations that the program may be wired to perform, as was required in the past. Furthermore, with the addition of error checking to the EPROM, if an EPROM program is changed to include different or additional applications, only the added or modified applications must be retested, not all the applications. 
   While the preferred embodiments of the present invention have been shown and described herein, it will be obvious that such embodiments are provided by way of example only. Numerous variations, changes and substitutions will occur to those of skill in the art without departing from the invention herein.