Diagnostic method and apparatus for vehicle having communication disabling function at engine starting
First Claim
1. A diagnostic apparatus for a vehicle which communicates with a management center provided away from the vehicle, comprising:
- a control unit for controlling various devices mounted on a vehicle and diagnosing conditions of the various devices; and
a communication unit which is connected to the control unit via a communication line and transmits a result of diagnosis by the control unit to the management center,wherein the control unit is programmed to discriminate at least one of a first inappropriate period in which noises are supposed to occur on the communication line due to engine starting and a second inappropriate period in which a process load required to control the various devices is supposed to be larger than a predetermined value, the control unit is programmed to disable a response thereof to the communication unit during the inappropriate period, even if there is a request for outputting the diagnosis result to the communication unit.
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Accused Products
Abstract
In a diagnostic method and apparatus for a vehicle, a transponder for performing a communication with an external receiver and an engine ECU are connected on a communication line. During a first inappropriate period in which noises are supposed to occur on the communication line due to engine starting or a second inappropriate period in which a processing load necessary for a control is supposed to be high when the engine speed is high or a load is high, even if there is a request for outputting abnormality information from the transponder, the engine ECU does not respond to the request. On the other hand, when it is not during the first and second inappropriate periods, the ECU responds to the output request from the transponder.
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Citations
14 Claims
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1. A diagnostic apparatus for a vehicle which communicates with a management center provided away from the vehicle, comprising:
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a control unit for controlling various devices mounted on a vehicle and diagnosing conditions of the various devices; and a communication unit which is connected to the control unit via a communication line and transmits a result of diagnosis by the control unit to the management center, wherein the control unit is programmed to discriminate at least one of a first inappropriate period in which noises are supposed to occur on the communication line due to engine starting and a second inappropriate period in which a process load required to control the various devices is supposed to be larger than a predetermined value, the control unit is programmed to disable a response thereof to the communication unit during the inappropriate period, even if there is a request for outputting the diagnosis result to the communication unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A diagnostic method between a vehicle having a control unit and a management center provided away from the vehicle, the control unit being programmed to control various vehicle-mounted devices and to diagnose various operations, comprising the steps of:
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detecting at least one of a first inappropriate period in which an engine is in a starting operation and a second inappropriate period in which the control unit is in a predetermined busy control processing operation for the vehicle-mounted devices; and disabling a response from the control unit to the management center, during the detected inappropriate period, with respect to a request for outputting a diagnosis result of the control unit. - View Dependent Claims (12, 13, 14)
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Specification