Indication device

Details Indication device Indication device

1999-09-07

2000-07-11

Hofsass, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340461, B60Q 100

Patent

active

060879297

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION

The invention relates to a display device for systems, in particular of a motor vehicle, which generates a warning signal or fault signal when there are predefined operating states and/or deviations from a set point operating state. These systems have a control device which is connected upstream of the display device and which stores the previously mentioned warning signals or fault signals.
Display devices and fault displays are generally customary in motor vehicles such as, for example, brake lining wear displays. In such displays a signalling light or the like is immediately switched on whenever the thickness of one of the brake linings (or pads) of a vehicle service brake drops below a predefined value.
Furthermore, motor vehicles may be equipped with monitoring devices which interrogate the respective operating state or fault signals of the motor vehicle systems which are generally specified, and store corresponding data over the long term. These data can then be displayed and/or converted into fault signals with a separate interrogation unit. Moreover, when a fault occurs, a display can be activated immediately. Appropriate arrangements are the subject-matter of German Patent document DE 32 29 411 A1 (having a counterpart in U.S. Pat. No. 5,019,799).
German Patent document DE 31 21 645 C2 discloses computer-aided control systems which are used for, among other things, controlling the engine and/or for controlling the ignition of the engine. They are also used for monitoring various vehicle systems and, in the process, storing status data and fault signals. In this way, the working capacity of the control systems can also be used for diagnostic purposes, i.e. the diagnostic interrogations can be carried out in the intervals between the control measures.
German Patent document DE 39 02 339 A1 relates to the acquisition of data in a battery-driven electric vehicle. Here, all the data of the vehicle and of the battery are collected and processed in an information processor and information store, and transmitted from there to a data evaluation unit.
The German Publication by B. Eberwein, W. Dorks entitled "Onboard--Diagnose--Ein Weg zu hoherer Fahrzeugverfugbarkeit (On board diagnostics--a way of improving vehicle availability)" in "nachverkehrs-praxis (local) traffic practice)" No. 9/1995, pages 268 to 270, relates generally to the usefulness of automatic diagnostic systems in vehicles. They enable the maintenance of a fleet of vehicles to be significantly simplified.
European Patent document EP 0 308 944 A2 describes a fault diagnostic device for a vehicle control system. Here, fault messages are stored and recalled before repair or maintenance work is performed. In this context, EP 0 308 944 A2 treats the problem of preventing fault information which is erroneously stored from being displayed. For this purpose, it is proposed to suppress the display of an item of fault information if the fault message is not repeated within a predefined time period. However, suppressed fault information can also be displayed again, in order, for example, to facilitate the diagnostic work of a workshop. As soon as the vehicle's engine is switched off (via the ignition switch), the vehicle control system and the fault diagnostic device are shut down.
U.S. Pat. No. 4,447,801 relates to a diagnostic system which, when the ignition of a vehicle engine is switched on, illuminates appropriate displays if a fault is detected. In this context, mention is made of the problem wherein a driver typically tends to ignore such warning displays because too many displays are illuminated at the same time. U.S. Pat. No. 4,447,801 proposes various approaches to overcoming this problem: activated. vehicle is activated. then successively switched off when the vehicle is activated. request of the driver.
In each case, the warning displays may relate to status variables which are independent of the running of the vehicle engine.
There is therefore needed a display device which can advantageously avoid

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