Abstract:
A diagnostic tool and method are provided wherein the diagnostic tool includes a wireless communication circuit to retrieve diagnostic software from a remote computing device. When operated, the scan tool can determine if the loaded diagnostic software is appropriate for the vehicle under test. If not, the diagnostic tool can retrieve the appropriate diagnostic software from the remote computing device. The retrieved or second diagnostic software is then operated to reprogram the diagnostic tool to remove the previously loaded software and allow a user to service a vehicle.

Description:
FIELD OF THE INVENTION 
     The present invention relates generally to an automotive diagnostic tool. More particularly, the present invention relates to a method of FLASH programming an automotive diagnostic tool and pass through devices over wireless communication connection. 
     BACKGROUND OF THE INVENTION 
     Modern vehicles typically have one or more diagnostic systems, generally having separate computer control modules to control various functions of the vehicle. Some examples include a powertrain control module (PCM), an engine control module (ECM), a transmission control module (TCM), an anti-locking brake system (ABS), and an air bag control module. The vehicle diagnostic systems often have self-diagnostic capabilities to detect and alert the driver of problems that the vehicle may be encountering. When a problem is found, a diagnostic trouble code (DTC), is set within the computer&#39;s memory. DTCs are as general or as specific as the manufacturer desires. 
     To retrieve and decipher DTCs, an auto repair technician needs a diagnostic tool, such as a scan tool. The scan tool is connected to the vehicle&#39;s computer bus system via a data link connector (DLC) to access and retrieve the DTCs. Scan tools are testing devices that interface with vehicle diagnostic systems to retrieve information from the various control modules. Scan tools are equipped to communicate in various communication protocols such as Controller Area Network (CAN), J1850 VPM and PWM, ISO 9141, Keyword 2000 and others. These communication protocols may be specific to each of the various vehicle manufacturers. The scan tool will help the technician to diagnose and repair the vehicle based on the information the tool retrieves from the vehicle. 
     The scan tools include computer software which must be periodically updated depending on the make and model of the vehicle to be serviced. In addition, the scan tool computer software may need to be updated from time to time as improvements in the software are made. Presently, many scan tools are FLASH programmed over a wired communication connection. FLASH programming a scan tool over wired communication connections is cumbersome because a user is required to bring the scan tool to a personal computer, and physically connect the scan tool to the personal computer. 
     A scan tool is physically connected to a personal computer with a cable. Cables vary in length depending on the particular application, but their maximum lengths are limited by their internal resistances associated with the conductors in the cables. Presently, there are cables that can link a scan tool and a personal computer when the two devices are separated by twenty feet. These cables require maintenance as the insulation surrounding them can deteriorate depending on whether they are properly cared for. In addition, the conductor within the cable may be broken within the cable if the cable is put in a high traffic area when it is continuously stepped on or driven over by a vehicle. Finally, requiring that the scan tool be physically connected to the PC limits the range that a technician can be from the personal computer and still update the scan tool. 
     Accordingly, it is desirable to provide a method and apparatus that allows a scan tool to be FLASH programmed over a wireless communication connection in order to eliminate the need for a cable and to extend the distance that one can operate a scan tool from a personal computer. 
     SUMMARY OF THE INVENTION 
     The foregoing needs are met, to a great extent, by the present invention, wherein in one aspect an apparatus is provided that in some embodiments allows a diagnostic tool to be reprogrammed with another diagnostic software that is retrieved from a remote computing device. 
     In accordance with one embodiment of the present invention a diagnostic tool for diagnosing a vehicle that includes a processor, a memory that stores a first diagnostic software that operates the processor to perform a diagnostic function, a connector interface that connects the diagnostic tool to a data link connector in the vehicle, a signal translator that allows the diagnostic tool to communicate with the vehicle in at least one communication protocol, a wireless communication circuit that communicates with a remote computing device to retrieve a second diagnostic software that is different from the first diagnostic software, and a housing surrounding the processor, the memory, the connector interface, the signal translator, and the wireless communication circuit. 
     In accordance with another embodiment of the present invention, a method of operating a diagnostic tool for a vehicle includes connecting the diagnostic tool to the vehicle, determining whether a first diagnostic software operating on the diagnostic tool is appropriate for the vehicle, communicating wirelessly with a remote computing device to obtain a second diagnostic software if the first diagnostic software is determined to be inappropriate, retrieving the second diagnostic software from the remote computing device, storing the second diagnostic software in the diagnostic tool, and operating the second diagnostic software to diagnose the vehicle. 
     In accordance with yet another embodiment of the present invention, a diagnostic tool for a vehicle, comprises a means for processing that is operated by a software program, a means for storing that stores a first software that operates the means for processing to perform a diagnostic function, a means for connecting that connects the diagnostic tool to a data link connector in the vehicle, a means for translating that allows the diagnostic tool to communicate with the vehicle in at least one communication protocol, a means for wirelessly communicating that communicates with a remote computing device to retrieve a second diagnostic software that is different from the first diagnostic software, and a means for housing surrounding the means for processing, the means for storing, the means for connecting, the means for translating, and the means for wirelessly communicating. 
     There has thus been outlined, rather broadly, certain embodiments of the invention in order that the detailed description thereof herein may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional embodiments of the invention that will be described below and which will form the subject matter of the claims appended hereto. 
     In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of embodiments in addition to those described and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein, as well as the abstract, are for the purpose of description and should not be regarded as limiting. 
     As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front view illustrating a diagnostic tool according to an embodiment of the invention. 
         FIG. 2  is a block diagram of the components of a diagnostic tool according to an embodiment of the invention. 
         FIG. 3 . illustrates a diagnostic tool wirelessly communicating with a remote computer. 
     
    
    
     DETAILED DESCRIPTION 
     The invention will now be described with reference to the drawing figures, in which like reference numerals refer to like parts throughout. An embodiment in accordance with the present invention provides an apparatus, such as a scan tool and method that allows a scan tool to be FLASH programmed over a wireless communication connection. 
     An embodiment of the present inventive apparatus is illustrated in  FIG. 1 . In particular,  FIG. 1  is a front view illustrating a diagnostic tool  100  according to an embodiment of the invention. The diagnostic tool  100  can be any computing device, such as, for example, the Nemisys diagnostic tool from Service Solutions (a unit of the SPX Corporation) in Owatonna, Minn. or Elite Autoscanner® Pro CP9190 from Actron (a unit of Service Solutions). The diagnostic tool  100  includes a housing  102  to house the various components of the diagnostic tool, such as a display  104 , a user interface  106 , a power key  108 , a memory card reader  110  (optional) and a connector interface  112 . The display  104  can be any display, for example, a liquid crystal display (LCD), a video graphics array (VGA), a touch display (which can also be a user interface), etc. The user interface  106  allows the user to interact with the diagnostic tool in order to operate the diagnostic tool as desired. The user interface  106  can include function keys, arrow keys or any other type of keys that can manipulate the diagnostic tool  100  in order to operate various menus that are presented on the display. The input device  106  can also be a mouse or any other suitable input device, including a keypad, or a scanner. The user interface  106  can also include numbers or be alphanumeric. The power key  108  allows the user to turn the diagnostic tool  100  on and off, as required. 
     Memory card reader  110  can be a single type card reader, such as a compact flash card, floppy disc, memory stick, secure digital memory, flash memory or other types of memory. The memory card reader  110  can be a reader that reads more than one of the aforementioned memory such as a combination memory card reader. Additionally, the memory card reader  110  can also read any other computer readable medium, such as CD, DVD, UMD, etc. 
     The connector interface  112  allows the diagnostic tool  100  to connect to an external device, such as an ECU of a vehicle, a computing device, an external communication device (such as a modem), a network, etc. through a wired or wireless connection. Connector interface  112  can also include a USB, FIREWIRE, modem, RS232, RS485, and other connections to communicate with external devices, such as a hard drive, USB drive, CD player, DVD player, UMD player or other computer readable medium devices. 
       FIG. 2  is a block diagram of the components of the diagnostic tool  100 . In  FIG. 2 , the diagnostic tool  100  according to an embodiment of the invention includes a processor  202 , a field programmable gate array (FPGA)  214 , a first system bus  224 , the display  104 , a complex programmable logic device (CPLD)  204 , the user interface in the form of a keypad  106 , a memory subsystem  208 , an internal non-volatile memory (NVM)  218 , a card reader  220 , a second system bus  222 , a connector interface  211 , a selectable signal translator  210 , a GPS antenna  232 , a GPS receiver  234 , an optional altimeter  236  and wireless communication circuit  238 . A vehicle communication interface  230  is in communication with the diagnostic tool  100  through connector interface  211  via an external cable (not shown). 
     Selectable signal translator  210  communicates with the vehicle communication interface  230  through the connector interface  211 . Signal translator  210  conditions signals received from an ECU unit through the vehicle communication interface  230  to a conditioned signal compatible with diagnostic tool  100 . Signal translator  210  can communicate with, for example, the following communication protocols: J1850 (VPM and PWM), ISO 9141-2 signal, communication collision detection (CCD) (e.g., Chrysler collision detection), data communication links (DCL), serial communication interface (SCI), S/F codes, a solenoid drive, J1708, RS232, Controller Area Network (CAN), Keyword 2000 (ISO 14230-4), OBD II or other communication protocols that are implemented in a vehicle. 
     The circuitry to translate and send in a particular communication protocol can be selected by FPGA  214  (e.g., by tri-stating unused transceivers) or by providing a keying device that plugs into the connector interface  211  that is provided by diagnostic tool  100  to connect diagnostic tool  100  to vehicle communication interface  230 . Signal translator  210  is also coupled to FPGA  214  and the card reader  220  via the first system bus  224 . FPGA  214  transmits to and receives signals (i.e., messages) from the ECU unit through signal translator  210 . 
     The FPGA  214  is coupled to the processor  202  through various address, data and control lines by the second system bus  222 . FPGA  214  is also coupled to the card reader  220  through the first system bus  224 . The processor  202  is also coupled to the display  104  in order to output the desired information to the user. The processor  202  communicates with the CPLD  204  through the second system bus  222 . Additionally, the processor  202  is programmed to receive input from the user through the user interface  106  via the CPLD  204 . The CPLD  204  provides logic for decoding various inputs from the user of diagnostic tool  100  and also provides glue-logic for various other interfacing tasks. 
     Memory subsystem  208  and internal non-volatile memory  218  are coupled to the second system bus  222 , which allows for communication with the processor  202  and FPGA  214 . Memory subsystem  208  can include an application dependent amount of dynamic random access memory (DRAM), a hard drive, and/or read only memory (ROM). Software to run the diagnostic tool  100  can be stored in the memory subsystem  208 , including any database. The database can include data for tuning or servicing a vehicle at various altitudes or regions. Because vehicles run differently (for example, oxygen levels vary at different altitudes) at different altitudes or regions, moving a vehicle (such as a racing vehicle) from one altitude to another or from one region (hot) to another region (cold) will require tuning the vehicle to that changed altitude and/or region as discussed below. The database can also be stored on an external memory, such as a compact flash card or other memories. 
     Internal non-volatile memory  218  can be an electrically erasable programmable read-only memory (EEPROM), flash ROM, or other similar memory. Internal non-volatile memory  218  can provide, for example, storage for boot code, self-diagnostics, various drivers and space for FPGA images, if desired. If less than all of the modules are implemented in FPGA  214 , memory  218  can contain downloadable images so that FPGA  214  can be reconfigured for a different group of communication protocols. 
     The GPS antenna  232  and GPS receiver  234  may be mounted in or on the housing  102  or any combination thereof. The GPS antenna  232  electronically couples to the GPS receiver  234  and allows the GPS receiver to communicate (detects and decodes signals) with various satellites that orbit the Earth. The GPS receiver  234  electronically couples to the processor  202 , which is coupled to memory  208 , NVM  218  or a memory card in the card reader  220 . The memory can be used to store cartographic data, such as electronic maps. The diagnostic tool can include all the maps for the U.S. (or country of use), North America or can have the region or state where the diagnostic tool is located. In alternative embodiments, the diagnostic tool can have all the maps of the world or any portion of the world desired by the user. 
     The GPS receiver must communicate with and “lock on” to a certain number of satellites in order to have a “fix” on its global location. Once the location is fixed, the GPS receiver with the help of the processor can determine the exact location including longitude, latitude, altitude, velocity of movement and other navigational data. 
     Should GPS receiver be unable to lock onto the required number of satellites to determine the altitude or unable to determine the altitude for any reason, the altimeter  236  can be used to determine the altitude of the diagnostic tool  100 . The altimeter  236  is electronically coupled to the processor  202  and can provide the altitude or elevation of the diagnostic tool. The altimeter can be coupled to a barometric pressure sensor (not shown) in order to calibrate the elevation measurements determined by the altimeter. The sensor can be positioned interior or exterior to the housing of the diagnostic tool. Minor atmospheric pressure changes can affect the accuracy of the altimeter, thus, diagnostic tool can correct for these changes by using the sensor in conjunction with the altimeter along with a correction factor. 
     Wireless communication circuit  238  communicates with the processor via second bus system  222 . The wireless communication circuit can be configured to communicate to RF (radio frequency), satellites, cellular phones (analog or digital), Bluetooth®, Wi-Fi, Infrared, Zigby, Local Area Networks (LAN), WLAN (Wireless Local Area Network), or other wireless communication configurations and standards. The wireless communication circuit allows the diagnostic tool to communicate with other devices wirelessly. The wireless communication circuit includes an antenna built therein and being housed within the housing or can be externally located on the housing. 
     A scan tool program is needed to operate the scan tool to perform the various diagnostic tests. Different vehicle manufactures (or even within the same manufacture) require the scan tool to operate using different programs and communication protocols. The scan tool may determine whether it is operating the correct software or program for a particular vehicle by comparing the vehicle type with the program currently running on the scan tool. The vehicle type may be inputted into the scan tool through the user interface  106  in a manner such as, for example, scanning a bar coded VIN number located on the vehicle to be serviced. From the vehicle information, the scan tool can then determine whether it is presently running the necessary program to service the vehicle. 
     The size of the scan tool program determines the amount of data resident on the scan tool, which in turn determines the amount of memory needed to be incorporated into the scan tool. Because computer memory is an expensive component in the manufacture of the scan tool, reducing the amount of memory needed by the scan tool reduces the overall cost of the scan tool. In order to reduce the amount of memory needed, the program related to specific vehicles is resident in the memory  208  and/or NVM  218  of the scan tool at any one time. When the scan tool determines that it is not running the necessary program to service the vehicle, the scan tool must be updated with the program appropriate for the vehicle to be serviced. In order to obtain this different program, the scan tool must connect to a remote computing device (not shown), such as a personal computer, a laptop, a server or other computer with either a collection of programs resident thereon. Alternatively, the remote computing device has the ability to access programs stored on another remote computing device connected to the internet, and then requests the required program. 
     In operation, the scan tool will utilize the wireless communication circuit  238  to communicate with the remote computing device to obtain the required scan tool program and then flashes or erases the current scan tool program. The program is sent by the remote computing device, and received by the wireless communication circuit  238 . The program is then transmitted via the bus  222  to the DRAM that is part of the memory subsystem  208 . Once the program is stored in the DRAM, the program runs to reprogram the ROM, which is also part of the memory subsystem  208  and/or part of NVM  218 . Once the ROM has been reprogrammed, the scan tool is able to service the vehicle. 
     By allowing the scan tool to store only the program required for the vehicle under test, the scan tool does not need to have much memory. The savings on memory allows a scan tool manufacturer to provide a lower cost scan tool to an end user. Additionally, by having one program being loaded on the scan tool at a time will decrease compatibility issues that occur when multiple programs are on the scan tool. 
       FIG. 3 . illustrates the diagnostic tool wirelessly communicating with a remote computer. The diagnostic tool  100  communicates with the remote computing device  310 . In one embodiment, the diagnostic tool can be used in and around a service station, while communicating with a remote computing device located inside the service station to obtain the proper diagnostic tool program. In another embodiment, the diagnostic tool can be used to communicate with a remote computer by wirelessly accessing the internet to obtain the proper diagnostic tool program. 
     In still another embodiment, the diagnostic tool can be used in and around a tow-truck or other service vehicle that is responding to a call away from the service station. In this embodiment, the diagnostic tool would communicate with a remote computing device located inside or near the tow-truck or other service vehicle to obtain the proper diagnostic software. 
     The above described method is done in the tool via software, however, hardware or hardware and software combination to carry out the method is also contemplated. All the steps described here do not have to be performed in order, variations of the order of the steps are also contemplated. 
     The many features and advantages of the invention are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the invention which fall within the true spirit and scope of the invention. Further, because numerous modifications and variations will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.