Abstract:
An engine diagnostic system includes an engine and a control system having a controller operatively connected to the engine. A monitoring system has a measurement device operatively connected to the engine. A diagnostic system is operatively connected to the engine. A communication system is configured to send and receive data from a remote location. The diagnostic system is configured to implement a non-starting engine diagnostic procedure, at least a portion of which is performed while the engine is cranking, and to transmit data generated during the engine diagnostic procedure to the remote location through the communication system.

Description:
RELATED APPLICATION(S) 
       [0001]    This application is based on U.S. Provisional Application Ser. No. 62/303,668, filed Mar. 4, 2016, the disclosure of which is incorporated herein by reference in its entirety and to which priority is claimed. 
     
    
     FIELD 
       [0002]    Various exemplary embodiments relate to performing remote engine diagnostic tests. 
       BACKGROUND 
       [0003]    Modern engines are complex systems that can include numerous mechanical and electrical components. Due to these complex systems, complex monitoring and diagnostic testing are often required to detect and diagnose failures or errors in the engine. Certain engines are equipped with internal diagnostic systems. Internal systems however, may be limited in scope due to size, cost, or performance considerations associated with the engine. Technicians and service centers are often equipped with significantly more robust and sophisticated diagnostic capabilities. The size and remote location use of some machines or vehicles can make it impractical to bring to a service center and the complexity of the systems can result in a technician that travels to the location of the machine having to spend a significant amount of time diagnosing the system and carry a large number of replacement parts to the location. 
         [0004]    Systems and methods of improving the diagnosis and service of the engine (and entire machines) can reduce the amount of time it takes a technician to resolve an issue, and improve machine uptime and the customer experience. A common problem is that the engine will crank but not start. Due to the complexity of modern engines and the large number of potential causes that could prevent the engine from starting, a technician must utilize sophisticated tools and follow multiple steps to diagnose the problem. 
       SUMMARY 
       [0005]    According to an exemplary embodiment, an engine diagnostic system includes an engine and a control system having a controller operatively connected to the engine. A monitoring system has a measurement device operatively connected to the engine. A diagnostic system is operatively connected to the engine. A communication system is configured to send and receive data from a remote location. The diagnostic system is configured to implement a non-starting engine diagnostic procedure, at least a portion of which is performed while the engine is cranking, and to transmit data generated during the engine diagnostic procedure to the remote location through the communication system. 
         [0006]    Another exemplary embodiment is directed to a method of diagnosing a non-starting engine. A signal is sent to a diagnostic system operatively connected to an engine, the signal is sent through a communication system configured to send and receive data from a remote location. A non-starting engine diagnostic procedure is implemented in response to the signal, wherein at least a portion of the non-starting engine diagnostic procedure is performed while the engine is cranking. Data generated during the non-starting engine diagnostic procedure related to the non-starting engine is obtained and transmitted to the remote location through the communication system. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]    The aspects and features of various exemplary embodiments will be more apparent from the description of those exemplary embodiments taken with reference to the accompanying drawings, in which: 
           [0008]      FIG. 1  is a schematic of an exemplary engine electronics system; 
           [0009]      FIG. 2  is a flowchart illustrating an exemplary method of diagnosing a non-starting engine; and 
           [0010]      FIG. 3  is a flowchart illustrating an exemplary diagnostic procedure for a non-starting engine. 
       
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0011]      FIG. 1  shows an exemplary embodiment of an electronic processing system  10  that is connected to an engine. The engine can be part of a vehicle that contains one or more ground engaging members, for example tires or treads, that are powered by the engine. Alternative embodiments can be directed to other types of moving or stationary machines that utilize an engine, for example a diesel engine used in a generator. 
         [0012]    In the exemplary embodiment shown in  FIG. 1 , the electronic processing system  10  includes a data bus  12  in communication with various components including a control system  14 , a monitoring system  16 , a diagnostic system  18 , and a communication system  20 . The electronic system  10  is configured to diagnose or at least partially diagnose different error conditions in the engine, for example a non-starting condition of the engine. Modern engines require sophisticated tools for diagnostics and service. There are many steps a technician must follow to diagnose an engine problem such as visual inspection, gathering data, or installing diagnostic tools. According to an exemplary embodiment, the diagnostic system  18  is connected to or integrated with the electronic system  10  to perform interactive tests and calibrations, such as a harness diagnostic test or injector calibration string input. By retrieving information and performing interactive tests locally and transmitting the data remotely, unnecessary diagnostic procedures can be eliminated or minimalized, allowing a technician to arrive at the machine with the right parts or a reduced range of parts. 
         [0013]    The electronic processing system  10  can include one or more of a data processor and data storage component. The electronic processing system  10  can be implemented by a general purpose computer that is programmed with software modules. The data bus  12  provides communication between the different components. The control system  14  can include one or more controllers or electronic control units, for example an engine control unit. The control system  14  can include software and/or firmware stored in memory to perform different operations and tasks. 
         [0014]    The monitoring system  16  can include various sensors or other measurement devices used to monitor the status of components in the engine. For example, the monitoring system can collect voltage information associated with different sensors, and this information can be compared to stored values in a chart or table. Based on discrepancies between the actual and stored values, error codes or diagnostic trouble codes (DTCs) can be generated, either by the control system  14  or the diagnostic system  18 . 
         [0015]    The diagnostic system  18  can be configured to perform multiple tasks, including initiating tests and recording errors sensed by the monitoring system  16 . For example, the diagnostic system  18  can receive and record, for example through a software module or instructions for analyzing, the results of diagnostic tests, fault codes, error messages, status messages, or test results provided by the monitoring system  16 . The diagnostic system  18  can also be capable of analyzing or comparing the information provided by the monitoring system  16  to a database that contains prior information related to the engine and standard operating information. The diagnostic system  18  can record and store data associated with the engine, and transfer that data via the communication system  20  over a network to a remote location, for example a dealer or service center. 
         [0016]    The service center receives the transmitted data and then process the data to provide a recommendation to a technician. The data can be processed by one or more data processing systems that can include a server, central processing unit, software modules or programmable logic, and electronic memory. In certain instances, the recommendation identifies a reduced number of potential sources of the problem from the maximum potential sources to allow the technician to carry fewer parts or equipment when visiting a location. The diagnostic system  18  also may be capable of producing, storing, or communicating DTCs. 
         [0017]    The communication system  20  is configured to locally and remotely communicate information over a communication network. The communication system  20  can provide communication over different wired or wireless systems and networks including mobile, satellite, Wi-Fi, near-field, Bluetooth, or a combination thereof as needed. In an exemplary embodiment, the communication system  20  is a telematics system. The telematics system includes, for example, a network of regional, national, or global hardware and software components. In addition, the telematics service may be provided by a private enterprise, such as an independent third-party company that provides the service to other companies, a manufacturing company that provides the service to its customers, or a company that provides the service to its own fleet of vehicles. Alternatively, the telematics service may be provided by a governmental agency as a public service. JDLink™ is an example of an agricultural vehicle telematics service, which is available from John Deere &amp; Company. 
         [0018]    The electronic processing system  10  can utilize other components including processors, data storage, data ports, user interface systems, controller area network buses, timers, etc., as would be understood by one of ordinary skill in the art. 
         [0019]    According to an exemplary embodiment, the electronics system  10  is configured to perform a diagnostic based on a non-starting engine and transfer generated information to a remote location. As shown in  FIG. 2 , a dealer or service center receives a complaint of a non-starting engine ( 100 ). The complaint can be from a customer call or generated automatically by the engine. An example of automatic generation can include the monitoring system  16  detecting multiple attempts to start the engine in a certain time period without a successful engine start and/or detecting a prolonged time period of engine cranking. If the complaint is received automatically, the service center can contact a user to ensure that the user is with the machine and in a safe place to perform the additional steps. 
         [0020]    The service center then informs the customer to keep the ignition on but the engine off ( 102 ). A command is then sent remotely from the service center to the machine ( 104 ), for example utilizing a remote service tool, and a signal can be returned to indicate the request was received ( 106 ). The diagnostic system  18  then begins to record engine data and start the test ( 108 ). The service center informs the customer to crank the engine for a specified period of time, for example fifteen seconds, and then to leave the switch in the ‘on’ position ( 110 ). While the engine is cranking, one or more test are performed by the system  10 , for example the control system  14  and/or diagnostic system  18 , and applicable data is recorded ( 112 ). The tests can also place one or more of the engine control units into a self-diagnostic mode ( 114 ). Once all the tests are complete ( 116 ), the diagnostic system can stop recording data and retrieve one or more DTCs ( 118 ). 
         [0021]    The test data and/or DTCs are then sent to the service center through the communication system  20  and analyzed by the service center ( 120 ). The gathered information is used to diagnose or narrow the problem for the technician ( 122 ), who can load the necessary parts ( 124 ) and travel to the machine ( 126 ). Once at the machine, the technician can perform further analyses and tests as needed ( 128 ). The technician can then install one or more replacement parts or perform a tasks to repair the engine ( 130 ) until the engine starts ( 132 ) and it is determined that the machine is operational ( 134 ). 
         [0022]      FIG. 3  shows an exemplary embodiment of a test diagnostic procedure that can be run by the diagnostic system  18 . After a signal is received to begin the no-start diagnostic ( 200 ), a first check is performed to determine if there are any presently generated DTCs ( 202 ). If there are any DTCs, they can be recorded and stored or sent to the service center. After the diagnostic system  18  checks for DTCs, any present DTCs can be cleared. 
         [0023]    The diagnostic system  18  then begins recording all parameters in a no-start engine category ( 204 ). In an exemplary embodiment the recording is triggered by a detection of a minimum engine speed, for example 50 revolutions per minute, with a 5 second pre-trigger continuous duration. This category will include different features and components based on the type of engine and fuel system and can be, or be related to, components of the engine identified as commonly resulting in a non-starting condition. The system then determines if the engine is stopped ( 206 ), and waits for the engine to be started by a user. At this time, the user begins to crank the engine for a time specified by the service center. 
         [0024]    While the engine is cranking, a timer starts and runs for a predetermined time period ( 208 ), for example a 60 second timer, although other time periods can be used. The procedure then monitors if the engine stops ( 210 ). If the engine is not stopped after the predetermined time period ( 212 ), an error can be issued and the test can be canceled or restarted ( 214 ). If the engine is stopped within the predetermined time period the diagnostic system  18  retrieves any DTCs that were generated ( 216 ). If there are any DTCs, they can be recorded and stored or sent to the service center. After the diagnostic system  18  checks for DTCs, any present DTCs can be cleared. 
         [0025]    The diagnostic system  18  can then, if necessary, institute a self-diagnostic command to one or more controllers. For example a harness diagnostic mode test can be implemented ( 218 ). In an exemplary embodiment, a harness diagnostic test includes a self-test that is programmed into the software of one or more controllers to assist in diagnosing electrical or mechanical engine problems that could cause a no-start situation. The functionality of the test varies depending on the engine, fuel system, and features. Some of the actions that can be performed include: Electrically energize the fuel injectors several times while the ECU monitors the injector current waveform and detect failures such as open or shorted circuits that result in a DTC; energize a high pressure fuel pump control solenoid(s) while the ECU monitors the current and detect failures such as open or shorted circuits resulting in a DTC; energize the engine cold start aid (e.g., glow plugs) briefly and verify that voltage is being applied to the device where a DTC would be expected if a failure is detected; command a learn (zero and span) of air system actuators (e.g., intake air throttle and exhaust gas recirculation) where an actuator that is not responding correctly to the learn command should result in a DTC; and test resistance of engine position sensor circuits (e.g., camshaft and crankshaft position) where a circuit that is out of range should result in a DTC. The harness diagnostic test can be run for a set period of time, for example 90 seconds, and be monitored by a timer ( 220 ). The controller monitors the harness diagnostic test ( 222 ), and if the harness diagnostic is not completed within the predetermined time ( 224 ), an error can be generated ( 226 ). 
         [0026]    After the harness diagnostic is completed, the diagnostic system can retrieve any generated DTCs ( 228 ) and stop recording data ( 230 ). The DTCs and other recorded data are then sent to the service center for analysis ( 232 ). The service center analyzes the data and makes a recommendation to a technician ( 234 ). 
         [0027]    Accordingly, the above identified systems and procedures can be used to remotely diagnose or eliminate potential problems with a non-starting engine condition. 
         [0028]    The foregoing detailed description of the certain exemplary embodiments has been provided for the purpose of explaining the general principles and practical application, thereby enabling others skilled in the art to understand the disclosure for various embodiments and with various modifications as are suited to the particular use contemplated. This description is not necessarily intended to be exhaustive or to limit the disclosure to the exemplary embodiments disclosed. Any of the embodiments and/or elements disclosed herein may be combined with one another to form various additional embodiments not specifically disclosed. Accordingly, additional embodiments are possible and are intended to be encompassed within this specification and the scope of the appended claims. The specification describes specific examples to accomplish a more general goal that may be accomplished in another way. 
         [0029]    As used in this application, the terms “front,” “rear,” “upper,” “lower,” “upwardly,” “downwardly,” and other orientational descriptors are intended to facilitate the description of the exemplary embodiments of the present disclosure, and are not intended to limit the structure of the exemplary embodiments of the present disclosure to any particular position or orientation. Terms of degree, such as “substantially” or “approximately” are understood by those of ordinary skill to refer to reasonable ranges outside of the given value, for example, general tolerances associated with manufacturing, assembly, and use of the described embodiments.