VEHICLE FAILURE DIAGNOSTIC DEVICE
First Claim
1. A failure diagnostic unit for making a failure diagnosis by comparing driving data relating to a plurality of parameters stored in an electronic control unit of a vehicle when a failure occurs in the vehicle with reference values as reference driving data during normal time, comprising:
- means for selecting reference value groups categorized by driving environment, which are entirely approximated to inspection data, by approximate search between the inspection data which is the driving data stored in the electronic control unit of a vehicle to be subjected to failure diagnosis and the reference value groups categorized by driving environment whose normal value ranges are set for the parameters categorized by driving environment; and
means for identifying a parameter having a large deviation from the normal value range by comparing the inspection data with the normal value ranges for the parameters in the selected reference value groups categorized by driving environment,the failure diagnostic unit searching a failure cause based on the identified parameter.
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Accused Products
Abstract
A vehicle failure is diagnosed based on data recorded in an electronic control unit (ECU) of a vehicle. Driving data pertaining to multiple parameters which are stored in the electronic control unit of the vehicle for when a vehicle failure occurs are compared with reference values representing data during normal driving in order to diagnose a failure. The device utilizes an approximate search between inspection data, that is, driving data which are stored in the electronic control unit of the vehicle to be diagnosed for failure, and reference value groups categorized by driving environment, wherein a normal value range is set for each of the aforementioned parameters categorized by driving environment, and selects the reference value group categorized by driving environment which approximates the inspection data. Furthermore, the device compares the inspection data with the normal value ranges of each parameter of the selected reference value group categorized by driving environment so as to identify parameters which deviate significantly from the normal value ranges and find the cause of the failure based on the parameters identified.
12 Citations
7 Claims
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1. A failure diagnostic unit for making a failure diagnosis by comparing driving data relating to a plurality of parameters stored in an electronic control unit of a vehicle when a failure occurs in the vehicle with reference values as reference driving data during normal time, comprising:
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means for selecting reference value groups categorized by driving environment, which are entirely approximated to inspection data, by approximate search between the inspection data which is the driving data stored in the electronic control unit of a vehicle to be subjected to failure diagnosis and the reference value groups categorized by driving environment whose normal value ranges are set for the parameters categorized by driving environment; and means for identifying a parameter having a large deviation from the normal value range by comparing the inspection data with the normal value ranges for the parameters in the selected reference value groups categorized by driving environment, the failure diagnostic unit searching a failure cause based on the identified parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification