Vehicular electronic control system, and electronic control unit, program, and storing member for the same
First Claim
1. An vehicular electronic control system having a plurality of electronic control units that are intercommunicative with each other via a communication line for data transmission and configured to transmit vehicle identifying information, which is unique to the vehicle, on demand from an external scan tool connected to the communication line, wherein each electronic control unit comprises:
- a storing means for storing the vehicle identifying information;
a detecting means for monitoring the communication line and detecting an output indicative of the vehicle identifying information sent from any one of other electronic control units to the external scan tool;
a timing means for timing an elapsed time since the electronic control unit has received a vehicle identifying information transmission request from the external scan tool and a response start time that is preset for each electronic control unit based on order of precedence; and
a communication means for reading the vehicle identifying information from the storing means and transmitting the vehicle identifying information to the external scan tool if the detecting means has not detected the output indicative of the vehicle identifying information to the external scan tool when the response start time has elapsed.
1 Assignment
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Accused Products
Abstract
A vehicular electronic control system includes multiple electronic control units (ECUs) to which a tester is connectable for diagnosis. Each ECU stores a vehicle identifying number (VIN) code that is transmitted to the tester for providing various kinds of information on a vehicle. A priority level is assign to each ECU so that the ECUs transmit the VIN code in order of precedence when the ECU having higher priority is unable to transmit the VIN code when another ECU has not transmitted the VIN code. Moreover, each ECU monitors a communication line when received a VIN code transmission request from the tester and detects an output indicative the VIN code sent from another ECU to the tester. When the ECU has detected the output, it terminates the VIN code transmission and do not transmits the VIN code to the tester.
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Citations
26 Claims
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1. An vehicular electronic control system having a plurality of electronic control units that are intercommunicative with each other via a communication line for data transmission and configured to transmit vehicle identifying information, which is unique to the vehicle, on demand from an external scan tool connected to the communication line, wherein each electronic control unit comprises:
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a storing means for storing the vehicle identifying information;
a detecting means for monitoring the communication line and detecting an output indicative of the vehicle identifying information sent from any one of other electronic control units to the external scan tool;
a timing means for timing an elapsed time since the electronic control unit has received a vehicle identifying information transmission request from the external scan tool and a response start time that is preset for each electronic control unit based on order of precedence; and
a communication means for reading the vehicle identifying information from the storing means and transmitting the vehicle identifying information to the external scan tool if the detecting means has not detected the output indicative of the vehicle identifying information to the external scan tool when the response start time has elapsed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic control unit that is installed on a vehicle, intercommunicative with other electronic control units via a communication line, and capable of transmitting vehicle identifying information of the vehicle on demand from an external scan tool connected to the electronic control unit via the communication line, comprising:
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a storing means for storing the vehicle identifying information;
a detecting means for monitoring the communication line and detecting an output indicative of the vehicle identifying information sent from any one of other electronic control units to the external scan tool;
a timing means for timing an elapsed time since the electronic control unit has received a vehicle identifying information transmission request from the external scan tool and a response start time that is preset for each electronic control unit based on order of precedence; and
a communication means for reading the vehicle identifying information from the storing means and transmitting the vehicle identifying information to the external scan tool if the detecting means has not detected the output indicative of the vehicle identifying information to the external scan tool when the response start time has elapsed. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 25)
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20. An vehicular electronic control system having a plurality of electronic control units that are intercommunicative with each other via a communication line for data transmission and configured to transmit vehicle identifying information, which is unique to the vehicle, on demand from an external scan tool connected to the communication line, wherein each electronic control unit comprises:
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a storing means for storing the vehicle identifying information;
a detecting means for monitoring the communication line and detecting an output indicative of the vehicle identifying information sent from any one of other electronic control units to the external scan tool;
a communication means for transmitting data that has been requested; and
a transmission requesting means for requesting the communication means to transmit the vehicle identifying information stored in the storing means to the external scan tool if the detecting means has not detected the output when the electronic control unit has received a vehicle identifying information transmission request from the external scan tool and to stop the vehicle identifying information transmission when the detecting means has detected the output from another electronic control unit after the electronic control unit has received the request, wherein the communication means transmits the data upon the data transmission request if the communication line is available, transmits the data when the communication line becomes available if the communication line is busy at a time when the data transmission request is received, and transmits the data according to a decision of arbitration made based on order of precedence predetermined for each electronic control unit when another electronic unit is ready for data transmission at the same time. - View Dependent Claims (21)
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22. An electronic control unit that is installed on a vehicle, intercommunicative with other electronic control units via a communication line, and capable of transmitting vehicle identifying information of the vehicle on demand from an external scan tool connected to the electronic control unit via the communication line, comprising:
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a storing means for storing the vehicle identifying information;
a detecting means for monitoring the communication line and detecting an output indicative of the vehicle identifying information sent from any one of other electronic control units to the external scan tool;
a communication means for transmitting data that has been requested; and
a transmission requesting means for requesting the communication means to transmit the vehicle identifying information stored in the storing means to the external scan tool if the detecting means has not detected the output when the electronic control unit has received a vehicle identifying information transmission request from the external scan tool and to stop the vehicle identifying information transmission when the detecting means has detected the output from another electronic control unit after the electronic control unit has received the request, wherein the communication means transmits the data upon the data transmission request if the communication line is available, transmits the data when the communication line becomes available if the communication line is busy at a time when the data transmission request is received, and transmits the data according to a decision of arbitration made based on order of precedence predetermined for each electronic control unit when another electronic unit is ready for data transmission at the same time. - View Dependent Claims (23, 24, 26)
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Specification