Boots – shoes – and leggings
Patent
1991-06-05
1993-10-12
Black, Thomas G.
Boots, shoes, and leggings
280735, 180282, B60R 2108
Patent
active
052531732
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention starts out from a method for evaluating a sensor signal. The same kind of method, whereby the integrated output signal from a sensor is compared to a threshold value, is known from the literature reference 1141 Ingenieurs de l'Automobile (1982) no. 6, 69-77. If the output signal from the sensor exceeds the specified threshold value, then restraining devices, such as air bags and/or belt tighteners are released to protect occupants. When conventional methods are used, the disadvantage is that the sensors have to be adjusted in a very costly procedure. In addition, during the lifetime of the motor vehicle, the once effected adjustment can change again, for example due to temperature influences and/or ageing processes that the components are subject to.
ADVANTAGES OF THE INVENTION
The advantage of the method according to the invention is that one can dispense with costly adjusting operations when the sensor is manufactured and installed in a control unit. Furthermore, any variations which occur later on in the form of temperature fluctuations and/or the ageing of components cannot have an adverse effect on the process of evaluating the sensor signals.
Advantageous further developments and refinements of the method of the present invention, and suitable devices for implementing the method will become apparent in view of the following detailed description and drawings .
DRAWINGS
Exemplified embodiments of the invention are depicted in the drawings and clarified in greater detail in the following description.
FIG. 1 depicts a first diagram representing a sensor signal as a function of time;
FIG. 2 a second diagram representing a sensor signal as a function of time;
FIG. 3 a block diagram of a first exemplified embodiment of a device for implementing the method according to the invention; and
FIG. 4 a block diagram of a second device.
DESCRIPTION OF THE EXEMPLIFIED EMBODIMENTS
In accordance with a first exemplified embodiment of FIG. 3, a device for implementing the method according to the invention comprises a sensor 1 having several outputs for its output signal. A first output of the sensor 1 is connected to the input terminal of a signal averager 2, whose output terminal is connected to the first input terminal of a first comparative circuit 4. A second output of the sensor 1 is directly connected to a second input terminal of the first comparative circuit 4. Also, a counting circuit 3 is connected to the signal averager 2. The output terminal of the first comparative circuit 4 is connected to a first input terminal of a second comparative circuit 6. A second input terminal of the second comparative circuit 6 is connected to the input terminal of a reference voltage source 5. The output terminal of the second comparative circuit 6 is connected to the input of an evaluation circuit 7, whose output is connected on its part to the input terminal of restraining devices 8.
In FIG. 4, a second exemplified embodiment of a device for implementing the method according to the invention differs still from the exemplified embodiment depicted in FIG. 3 in that the second output of sensor 1 is also not directly connected to an input terminal of a first comparative circuit 4, but rather to the input terminal of a second signal averager 9, whose output terminal is connected to the second input terminal of the first comparative circuit. In addition, a second counting circuit 10 is connected to the second signal averager 9.
The method according to the invention shall be clarified in the following, also with reference to the diagrams depicted in FIG. 1 and FIG. 2. In an idealized representation, FIG. 1 shows the output signal a from the sensor 1 as a function of time t. The sensor 1 is preferably an acceleration-sensitive sensor, for example a piezoelectric crystal, which emits an output signal that is proportional to the acceleration of the motor vehicle. To formulate an average value M from the output signal of sensor 1 by means of the first signal averager 2, according to the following formu
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Drobny Wolfgang
Nitschke Werner
Taufer Peter
Black Thomas G.
Robert & Bosch GmbH
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