Method and system for detecting vehicle roll-over

Details Method and system for detecting vehicle roll-over Method and system for detecting vehicle roll-over

1994-08-25

1997-03-11

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340436, 280772, 364424055, G08B 1302

Patent

active

056105754

ABSTRACT:
A method and system for detecting a vehicle roll-over utilizes a z-axis accelerometer (12) and a processor (20) for analyzing the accelerometer output (18) to provide early detection/prediction of a vehicle roll-over. The output signal (18) is substantially a positive constant value equal to the force of gravity when the vehicle (16) is in a normal upright condition, and as the vehicle (16) experiences a roll-over, the output signal transitions to a substantially negative constant value when the vehicle has rolled 180.degree. upside down. To provide early roll-over detection and/or prediction, the z-axis data is averaged (102) and compared to a first threshold value (104) set to a g-force value within a range of 0 to -1 g. Estimating a slope value (step 110), i.e. the change in z-axis data over time, can provide an additional discrimination measure to improve overall reliability, and to provide a qualitative measure of the roll over.

REFERENCES:
patent: 4078224 (1978-03-01), Mize
patent: 4103920 (1978-08-01), Smith
patent: 5202831 (1993-04-01), Blackburn et al.
patent: 5261506 (1993-11-01), Jost
patent: 5383680 (1995-01-01), Bock et al.
patent: 5396423 (1995-03-01), Fujimura et al.
patent: 5480186 (1996-01-01), Smith
"The Raisable Roll-Over Bar of the New Mercedes-Benz Roadster", Baumann et al, SAE Convergent Show 1990, SAE Technical Paper Series pp. 55-64.

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