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Time stamping of diagnostic trouble codes (DTS) for units in vehicle

IP.com Disclosure Number: IPCOM000012531D
Publication Date: 2003-May-13
Document File: 2 page(s) / 22K

Publishing Venue

The IP.com Prior Art Database

Related Documents

US-6115653-A: PATENT

Abstract

A vehicle comprises a network of different ECUs, where data is sent between the ECUs via at least one bus adapted for e.g. CAN (Controller Area Network), Flexray and TTCAN. All ECUs thereby do not need a time circuit of their own, but may receive the time from a clock unit responsible for sending a reference time to the other ECUs via the bus. Faults in the system is categorised into three different types.

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Time stamping of diagnostic trouble codes (DTS) for units in vehicle

The invention relates to time stamping of Diagnostic Trouble Codes (DTC) for units comprised in a vehicle.

Background of the invention

When a fault occurs in a unit in a vehicle, such as in an auxiliary heater, sensor and one of the electronic control units (ECUs) for the engine, air condition and brakes, the fault is indicated through a DTC and generated by an internal diagnostic system in said unit. See e.g. the patent specification US-6115653-A for more information of an internal diagnostic system that generates DTC. The DTC is preferably retrieved by a diagnostics computer program in a vehicle external computer connectable to the units. The external comuter, which is used for assisting a workshop or a vehicle manufacturer in determining why a certain fault has arisen. Since faults may occur in several different units in the vehicle, the times when the faults occurred are also registered, in order to find the unit where the first faults occurred and thereby easier determine which subsequent faults are consequences of the first faults.

Summary of the invention

The object of the present invention is to make a clearer presentation of a fault type in the sense that it is easier to understand. It is also an object to more accurately be able to determine when the fault occurred.

An exemplary system in which the invention can be implemented, is in a network of different ECUs, where data is sent between the ECUs via at least one bus adapted for e.g. CAN (Controller Area Network), Flexray and TTCAN. All ECUs thereby do not need a time circuit of their own, but may receive the time from a clock unit responsible for sending a reference time to the other ECUs via the bus. Faults in the system is according to the embodiments below categorised into three different types....