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Method for recording of data related to malfunctions of a vehicle

IP.com Disclosure Number: IPCOM000028139D
Publication Date: 2004-Apr-28
Document File: 4 page(s) / 50K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention relates to a method for obtaining and recording of data related to malfunctions of different systems and control units of a vehicle, such as a truck, during tests thereof. The invention is based on the idea of using error codes instead of thresholds for sensor or parameter values for initiating or triggering the recording of data.

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Method for recording of data related to malfunctions of a vehicle

Technical field of the invention

The present invention relates to a method for obtaining and recording of data related to malfunctions of different systems and control units of a vehicle, such as a truck, during tests thereof.

Background of the invention

During the development of a new vehicle, such as a truck, a number of different tests are performed including field runs where, the truck is tested under real conditions, and simulated runs, where the different systems of the truck is tested in the lab, for example, the engine control unit, which comprises the software controlling the internal combustion engine of the truck. The purposes with these tests are, for example, to evaluate whether the different functions of the control systems of the truck fulfils pre-defined performance requirements, or to evaluate the durability of different parts or subsystems of the systems, such as temperature sensors and pressure sensors. During these tests the test data related to the functions and/or features of the truck are recorded and stored in a memory unit located, for example, in a PC connected to the control unit by means of a data collection program. Thereafter, the recorded data is viewed and evaluated by development engineer  in order to locate malfunctions and/or sources of errors. However, this procedure will be very time-consuming if the recorded data is not limited in some way since, for example, a field run can last for about 4 hours and the amount of data produced will consequently be very extensive.

To this end, trigger events that initiate or trigger the recording of the data have been introduced in the data collection programs used today. Traditionally, a trigger  event has been the crossing of a threshold for the different sensor or variable values of the systems of the truck. As an example, a lower threshold and a higher threshold for the voltage of a temperature sensor of the engine. In this case, the recording of the data related to the temperature sensor, i.e. the voltage of the sensor or the sensing value, is initiated when the program is notified that the voltage of the temperature sensor has exceeded the higher threshold or has fallen below the lower threshold. This procedure can be beneficial when the source of error is well-defined or known, i.e. which variable that gives rise to a specific error. However, if the source of error is not specifically associated with a variable, not known, or where it can be multiple sources, this procedure for initiating the recording of data will not be suitable. Accordingly, there is a need for an improved method for obtaining or recording data related to functions and control units of vehicles, such as trucks, during tests thereof that produces a manageable amount of data and that is able to obtain data related to errors where the source is unknown or where there can be multiple sources of error.

 

Brief description of the inven...