Method and device for searching service diagnosis request

Abstract

The invention provides a method and device for searching for service diagnosis requests. A lookup table is set in advance, and the value of each element in the lookup table is initialized to be a first identification. The method includes the steps that a service identification set of the service diagnosis requests supported by an electronic control unit is obtained, service identifications in the service identification set are ranked in the sequence from small to large or in the sequence from large to small, a first service identification set is obtained, a reference number corresponding to each service identification is determined according to a preset rule, a second identification corresponding to each service identification is determined by ranking of each service identification in the first service identification set, the second identifications replace the first identifications which are indexed through the corresponding reference numbers, and a first lookup table is obtained; when the service identifications of the service diagnosis requests are received, the first reference numbers are determined through the service identifications, and the elements indexed through the first reference numbers are read from the first lookup table. By means of the method and device for searching for the service diagnosis requests, the same lookup speed of each diagnosis service request can be guaranteed, and only one lookup workload is needed.

Description

technical field [0001] The invention relates to the technical field of automobile diagnosis communication, in particular to a method and device for searching a service diagnosis request. Background technique [0002] With the rapid development of electronic technology, electronic control unit ECU is widely used in automobiles, and these ECUs generally communicate with each other through the controller area network CAN. During the driving process of the car, in addition to communicating with other ECUs, a single ECU will also monitor some of its own fault status in real time, for example, whether communication with other ECUs is lost. Once a corresponding fault occurs, the ECU will follow a fixed format Save the fault information in its own Flash or EEPROM. If a serious failure occurs, the car owner will send the car to the 4S shop for maintenance. At this time, the car maintenance personnel will connect the car diagnostic equipment to the OBD interface of the car, and opera...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a service diagnosis request search method and device to solve the problem in the prior art that search speeds of different SIDs are very different due to search methods, and the technical solution is as follows:

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