Process for generating collision signals

• US 6,959,244 B1
• Filed: 11/04/1997
• Issued: 10/25/2005
• Est. Priority Date: 11/20/1996
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Henne, Michael, Maschek, Marko
• Primary Examiner(s): LOUIS JACQUES, JACQUES H
• Application Number:
  US08/963,720
• Time in Patent Office: 2,912 Days
• Field of Search: 340/435, 340/903, 340/436, 340/438, 340/439, 280/734, 280/735, 280/703.1, 180/268, 180/271, 180/272, 180/274, 180/282, 701/300, 701/301, 701/36, 701/45, 701/46, 701/47, 303/10.1
• US Class Current: 701/301
• CPC Class Codes: B60R 21/0132 responsive to vehicle motion parameters , e.g. to vehicle longitudinal or transversal deceleration or speed value
• CPC Class Codes: B60R 21/01336 using filtering
• CPC Class Codes: G01P 21/00 Testing or calibrating of apparatus or devices covered by the preceding groups
• CPC Class Codes: H03H 17/06 Non-recursive filters

Abstract

A relatively uncomplicated process for generating collision signals that describe various collision processes involving motor vehicles. The process involves deriving a core signal by low-pass filtering from a collision signal actually measured, splitting this core signal into several signal segments, simulating each signal segment by a transmission function, then combining all the transmission functions into one overall transmission function, and forming one or more new collision signals by varying at least one parameter of the overall transmission function.

Claims

1. A process for generating at least one descriptive collision signal describing motor vehicle collisions, comprising the steps of:

deriving a core signal by low-pass filtering a collision signal actually measured;

splitting the core signal into a plurality of chronologically sequential signal segments;

transforming each of the signal segments into simulated signal segments using a respective transmission function having an input;

combining the transmission functions to form an overall transmission function; and

forming the at least one descriptive collision signal by varying at least one parameter of the overall transmission function.

2. The process according to claim 1, wherein the core signal is split into individual pulses.

3. The process according to claim 2, further comprising the step of determining the signal segments by comparing the individual pulses with a model pulse, and accepting one of the individual pulses as an individual signal segment when the individual pulse is within preset limits relative to the model pulse, the model pulse being a gaussian pulse, the gaussian pulse being variable through a plurality of parameters.

4. The process according to claim 1, wherein the signal segments are simulated using the transmission function in a complex z plane in the following manner:

$\mathrm{He}<br><br>\left(z\right)=\frac{\mathrm{b0}+{\mathrm{b1z}}^{-1}+{\mathrm{b2z}}^{-2}}{1+{\mathrm{a1z}}^{-1}+{\mathrm{a2z}}^{-2}+{\mathrm{a3z}}^{-3}}$

wherein b0, b1, b2, a1, a2, and a3 are coefficients identified for the signal segments.

5. The process according to claim 1, wherein the overall transmission function is determined in the following manner:

$\mathrm{Hs}<br><br>\left(z\right)=\underset{i=1}{\overset{z}{\sum <br><br>}}<br><br>\text{\hspace{1em}<br><br>}<br><br>\underset{j=0}{\overset{m}{\sum <br><br>}}<br><br>\text{\hspace{1em}<br><br>}<br><br>\underset{k=0}{\overset{n}{\sum <br><br>}}<br><br>\text{\hspace{1em}<br><br>}<br><br>\frac{{\mathrm{bjiz}}^{-1}}{{\mathrm{akiz}}^{-k}}<br><br>z^{-\mathrm{li}}$

wherein i is a running index for the signal segments, with s being a number of signal segments;

j is a running index for a numerator coefficient b, with m being an order of the numerator coefficient;

k is a running index for a denominator coefficient a, with n being an order of the denominator coefficient; and

l is a vector denoting boundaries of the signal segments.

6. The process according to claim 5, wherein at least one complex pole in the overall transmission function is varied to form the at least one descriptive collision signal.