Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Patent
1997-11-20
2000-01-04
Nguyen, Tan
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
701 35, 395290, G07C 300, B60R 1602
Patent
active
060120045
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to time management of a fault diagnostic apparatus for a vehicle, and more particularly, to a system and a method for managing time for a vehicle fault diagnostic apparatus for the management of a standard time among a plurality of controllers in a fault diagnostic apparatus for an industrial vehicle.
BACKGROUND ART
In the situation in which electronic control of engines and transmissions of vehicles is rapidly proceeding, functions required for controlling each component have been highly advanced. In order to satisfy the required functions, the number of devices using a microcomputer (hereinafter, referred to as CPU) in a controller for controlling each component has increased. As a result, a plurality of controllers, each using the CPU, are installed in an electronic control device for one vehicle. With the advancement of the functions of such an electronic control device, fault diagnosis becomes difficult, and it is an important problem as to how faulty points are discovered in a shorter time under fault conditions in order to shorten the downtime of the vehicle.
In order to solve the above problem, vehicle fault diagnostic apparatuses have been proposed in which the CPU of each controller performs the fault diagnosis with respect to the respective controllers, and achieves easy diagnosis by displaying results of the diagnosis. For example, in Japanese Unexamined Patent Publication No. 4-304589, a vehicle fault diagnostic apparatus, shown in FIG. 5, is proposed. According to this proposal, an electronic control device for a vehicle is composed of a master controller 1 and a plurality of controllers 11a, 11b, 11c, . . . , 11n, and the respective controllers are connected to each other by a communication network 10. The master controller 1 and the controllers are composed of a system centered on the CPU.
Each of the controllers inputs signals from a sensor and a switch to control respective components of the vehicle, and outputs a signal to control an actuator, etc., based on the signals. In addition, each of the controllers has a fault detecting section for detecting faults of the above connected sensor and actuator, and always transmits the detected fault data to the master controller 1 through the communication network 10.
The master controller 1 is composed of a CPU 2, a network interface 3, a memory 4, an operating switch 6, and a display 7. The memory 4 stores results of calculations, communication data, and fault information of the respective controllers. The CPU 2 always receives fault data from the controllers 11a, 11b, 11c, . . . , 11n using, for example, a polling method, and checks whether or not there is a bit into which "1" showing fault detection is written in fault items of the received data. When there is a bit into which "1" is written, an error code corresponding to the fault item of the bit is written into a predetermined storage area in the memory 4, and the time elapsed since occurrence of the fault is written into the predetermined storage area.
The predetermined storage area, in which the error code and its elapsed time are stored, is in the form of a fault history such that the error codes are stored in the order of the time at which the error code was generated. That is, the error codes and the elapsed time are stored in the predetermined storage area in the order of generation, and when a predetermined number of error codes are stored, the next and later error codes are stored in the initial address of the above predetermined storage area. In this way, the oldest error code and its elapsed time are stored by being renewed by the latest error code and its elapsed time. In addition, each elapsed time renews the previous elapsed time per a predetermined time (one hour, for example) since occurrence of the fault. Further, when an operator investigates the cause of the fault, the operating switch 6 can be operated to display the previous fault history on the display 7. By analyzing the fault history data, the cause can be investigated
REFERENCES:
patent: 5555171 (1996-09-01), Sonehara et al.
Shimura Hiroshi
Sugano Yukio
Komatsu Ltd.
Nguyen Tan
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