A block diagram of an airbag circuit is shown in Figure 15.46. Note the ‘watch-
dog’ system which ensures correct operation at all times. A digital-based
system using electronic sensors has about 10 ms at a vehicle speed of 50
km/h, to decide if the restraint systems should be activated. In this time more
than 10 000 computing operations are necessary. Data for the development of
these algorithms are based on computer simulations but digital systems can
also remember the events during a crash, allowing real data to be collected.
15.6.4 Seat-belt tensioners
Taking the ‘slack’ out of a seat-belt in the event of an impact ...
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