Measuring and testing – Liquid level or depth gauge – With illumination
Reexamination Certificate
2000-11-14
2003-07-08
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
With illumination
C073S313000, C340S617000
Reexamination Certificate
active
06588270
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The subject matter of the invention is a filling level indicator for a washer fluid container as preferably used in motor vehicles.
It is known to equip washer fluid containers which are arranged in motor vehicles so that they indicate to the driver the current filling level in the washer fluid container. Filling level indicators of this type are known both as indicators of the entire filling level and as indicators of the remaining quantity.
Essentially, two types of indicating device are known. In addition to mechanical indicating devices, which are generally float-operated enabling the level to be read off directly on the washer fluid container, a multiplicity of electric indicating devices are known in which the filling level is detected by means of one or more sensors and an electric signal obtained therefrom is used in order to indicate the filling level. Generally, the last-mentioned filling level indicator is integrated in the instrument cluster on the motor vehicle and, when the ignition is switched on, continuously informs the driver about the current filling level and when it has fallen below a certain remaining quantity in the washer fluid container.
Whereas, for example, not paying attention to the indicator indicating that the cooling-water temperature is too high directly results in the motor vehicle being damaged, this risk is not involved in the case of the filling level indicator for the washer fluid. Consequently, despite the continuous indication of the level being too low, the filling of the washer fluid is often delayed until the washer fluid container is empty. With the washer fluid container empty and, for example, adverse weather conditions resulting in restricted vision, traffic-endangering situations may occur.
SUMMARY OF THE INVENTION
The invention is therefore based on the object of providing a filling level indicator for a washer fluid container, said indicator enabling the filling level to be indicated more effectively.
The filling level indicator according to the invention has the advantage that, with it being positioned in the region of the tank filler neck, the driver is informed about the filling level in the washer fluid container precisely whenever he has in any case to interrupt his journey in order to fill up the fuel tank. Firstly, at least at the beginning of filling up with fuel, the driver's attention is directed to this region and therefore inevitably to the indicating element, and, secondly, the driver is situated at this time at a location, for example a gas station, at which both washer fluid and also necessary additives, such as antifreeze and cleaning agents, are available without a relatively large outlay. A further advantage is that the driver obtains information concerning the topping-up of the washer fluid container at a time when he is generally free from other activities, so that he can fill up the washer fluid container at the same time as filling up with fuel. The filling up of the washer fluid container thereby takes up relatively little time. At the same time, the device according to the invention avoids a situation in which the driver pays less attention to or ignores the information content, as is the case, for example, with indicators arranged permanently in the driver's field of view.
Furthermore, the filling level indicator has the advantage of being independent of the surrounding light, and therefore the indicating element can readily be seen even in reduced light.
In the most simple case, the filling level indicator is an indicating element consisting of a transparent material which is lit from behind by at least one light source. The light source may, for example, be a bulb or a light-emitting diode—called LED in the following text. The filling level indicator according to the invention is therefore of particularly simple construction. In order to avoid damage to the indicating element and therefore also to the light source by the fuel nozzle, the indicating element has an adequate wall thickness. Fuel vapors are therefore effectively prevented from coming into contact with electrically conductive parts. The filling level indicator can be arranged both next to the tank filler neck in the filler neck compartment and also on the tank flap.
Even greater security against damage is ensured by a refinement in which the light source is separated spatially from the indicating element, the filling level indicator additionally comprising a light guide which is arranged between the light source and the indicating element. The light source can thereby be arranged in a safe region. The necessary security is therefore provided not only when filling up with fuel, but also in the event of an accident in the rear region of the motor vehicle.
In vehicles having a central-locking system, the tank flap can be locked by means of this system. The locking is undertaken here by an actuator. consisting of a gear motor having a tappet. This actuator is arranged next to the filler neck compartment, but behind the vehicle body. In this case, an advantageous refinement resides in integrating the light source in the housing of the actuator. On the one hand, the light source can therefore be protected mechanically and from contamination without an additional housing. On the other hand, there are already electrical connections for the gear motor in the actuator, with the result that connections for the light source can be arranged without a relatively large outlay. Furthermore, the light source does not need to be fastened separately and can be preassembled together with the actuator.
Moreover, it is advantageous to arrange the indicating element on the tappet of the actuator for the tank-flap lock. Since the tappet already has a passage through the vehicle body, this arrangement for the indicating element means that no further opening together with the associated seal is needed in the vehicle body. The retrofitting of the filling level indicator according to the invention or the change to this filling level indicator does not result in any changes to the vehicle body. At the same time, an additional installation of the filling level indicator in the region of the filler neck is rendered superfluous.
To more clearly indicate the filling level, it is advantageous if the tappet is extended, when the tank flap is opened, from its recessed position into the visible region within the filler neck compartment. The tappet can be extended in a simple manner, independently of the central-locking system, by a switch, for example a reed contact, being actuated with tho opening of the tank flap. It is furthermore possible to couple the retraction and extension of the tappet to a tank cap-recognizing means in accordance with DE 44 04 014 A1, so that the tappet is extended when the tank cap is removed and retracted when the tank cap is closed. The retraction of the tappet can be triggered after a fixedly predetermined period in a particularly simple manner by means of a relay.
In another refinement, the tappet is only extended, or the filling level indicator only activated, if an appropriate signal, for example washer fluid container half full, washer fluid container empty, is supplied by the filling level sensor in the washer fluid container.
In order to even more clearly indicate the filling level, it is advantageous to arrange two or more light sources having different colors which light one or more indicating elements from behind. This enables different filling levels to be rendered visible by means of different colors. In this case, a green light source could signal an adequate filling level, a yellow light source informs the driver that the filling level amounts to less than half, and a red light source indicates to the driver that the filling level is approaching zero or that the washer fluid container is empty.
The same effect can also be achieved with one light source instead of with a plurality of light sources if the light source is lit continuously during indicating when the filling level is still
Kober Rainer
Petzold Sven
Uenver Ralph
Farber Martin A.
Mannesmann VDO AG
Williams Hezron
Wilson Katina
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