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This article begins with the concept of battery safety and distinguishes several categories of hazards of battery systems: functional safety conditions, non-functional safety conditions, and primary hazards. A set of safety procedures compatible with ISO2626 and automotive system/subsystem development processes was proposed and entered into the subsystem/component development process at each step. The two parts of the preliminary hazard analysis and safety requirements are mainly described. These two parts can also refer to ISO26262-2 and ISO26262-3.
The application of system security in large-scale mass production components is actually a problem that is difficult to overcome. This article proposes an idea. At least in the papers I understand (the Japanese in the Japanese auto industry and the German auto industry in German, I have always been very interested, but the language barrier is still too big, relying on the articles written by the car companies in the North American branch, it is It’s a glass of water.)
A siren is a loud noise-making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulances, police cars, and fire trucks. There are two general types: pneumatic and electronic.
Many fire sirens (used for calling the volunteer fire fighters) serve double duty as tornado or civil defense sirens, alerting an entire community of impending danger. Most fire
sirens are either mounted on the roof of a fire station or on a pole
next to the fire station. Fire sirens can also be mounted on or near
government buildings, on tall structures such as water towers,
as well as in systems where several sirens are distributed around a
town for better sound coverage. Most fire sirens are single tone and
mechanically driven by electric motors with a rotor attached to the
shaft. Some newer sirens are electronically driven speakers.
Fire sirens are often called "fire whistles", "fire alarms", or
"fire horns". Although there is no standard signaling of fire sirens,
some utilize codes to inform firefighters of the location of the fire.
Civil defense sirens also used as fire sirens often can produce an
alternating "hi-lo" signal (similar to emergency vehicles in many
European countries) as the fire signal, or a slow wail (typically 3x) as
to not confuse the public with the standard civil defense signals of
alert (steady tone) and attack (fast wavering tone). Fire sirens are
often tested once a day at noon and are also called "noon sirens" or
"noon whistles".
The first emergency vehicles relied on a bell. Then in the 70s,
they switched to a duotone airhorn. Then in the 80s, that was overtaken
by an electronic wail.
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