Active safety

Active safety

In engineering, active safety systems are systems which can be activated in response to a safety problem or abnormal event. Such systems could be activated either by a human operator, automatically by a computer driven system, or even mechanically. In nuclear engineering, active safety contrasts to passive safety in that it relies on operator or computer automated intervention, whereas passive safety systems rely on the laws of nature to make the reactor respond to dangerous events in a favourable manner.


*The computer operated control rods in a nuclear power station provide an active safety system, whereas a fuel which produces less heat at abnormally high temperatures constitutes a passive safety feature.
*The seat belts of a modern car are attached to a mechanical device which prevents the seatbelt from being rapidly extended in the case of a collision.
*Many buildings have interconnected fire alarms that can be triggered manually by pushing a button or breaking a glass plate attached to sensors.

Automotive Sector: Blurred defintions

In the automotive sector the term 'active safety' has traditionally referred to systems that help prevent accidents. For example, good visibility from the vehicle can be considered a component of active safety (the term Primary Safety is also used). This compares with passive safety (or Secondary Safety), which include features that may help mitigate the severity of accidents.However, a new generation of safety features that operate automatically, in response to sensor signals that give an understanding of the vehicle's state, are also being referred to as active safety systems. These systems, such as intelligent speed adaptation, ABS, ESC, brake assist, traction control, VSC, VDIM and seat belt pre-tensioning are active in the sense that they invoke an action in order to improve safety. The confusion comes because this can include systems such as seat belt pre-tensioning which would be considered active because they take action in an accident, even though their role in mitigating the accident's effect would have traditionally seen them classed as passive safety systems.Here, a useful separation may be achieved by considering those systems and design elements that are relevant up "to the moment of impact" contribute to the 'active safety', and those which are called upon and affect the system performance "from the moment of impact" contribute to the 'passive safety'.

Active Safety Features in Automobiles, some examples:

Contributors to active safety of a motor vehicle, accident avoidance:-good visibility from driver's seat,low noise level in interior,legibility of instrumentation and warning symbols,
early warning of severe braking ahead,head up displays,good chassis balance and handling,good grip,ABS braking, ESP Chassis assist,
intelligent speed adaptation,all wheel drive,secure luggage and passengers (cannot interfere with vehicle or driver) etc.

Passive Safety Features in Automobiles, some examples:

Contributors to passive safety of a motor vehicle, accident limitation, minimisation of outcome:-Passenger safety cell,deformation zones,seat belts,loadspace barrier-nets,air-bags,laminated glass,correctly positioned fuel tanks,fuel pump kill switches etc.

ee also

* Passively safe

* Intelligent Speed Adaptation (ISA)

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Active Safety — The term Active Safety can be used in two distinct ways. The first, mainly used in the US, refers to safety systems that help avoid accidents, such as good steering and brakes. In this context, passive safety refers to features that help reduce… …   Wikipedia

  • active safety — The opposite of passive safety. Passive safety involves seat belts, airbags, bumpers, etc. so that in the event of an accident the passengers are protected. Active safety involves factors which will assist the driver in avoiding an accident. They …   Dictionary of automotive terms

  • Safety (firearms) — This article is about the mechanical safety devices built into most firearms. For the main article about firearm safety education, see Gun safety. Close up shot of a safety of an M16A2 rifle. In firearms, a safety or safety catch is a mechanism… …   Wikipedia

  • safety — See active safety child safety driveshaft safety strap Experimental Safety Vehicle infant safety seat integrated child safety seat integrated safety belts Motor Vehicle Safety Act …   Dictionary of automotive terms

  • safety, active — See active safety …   Dictionary of automotive terms

  • Active Traffic Management — (ATM) is a scheme for improving traffic flow and reducing congestion on motorways in Britain. It makes use of automatic systems and human intervention to manage traffic flow and ensure the safety of road users. It is currently in operation on the …   Wikipedia

  • Safety climate — is a term commonly used to describe the sum of employees’ perceptions regarding overall safety within their organization. Much debate still continues over the definition and application of safety climate as the term is still used interchangeable… …   Wikipedia

  • Active Steering — is an automotive technology utilised by BMW which varies the degree that the wheels turn in response to the steering wheel. At lower speeds, this technology reduces the amount that the steering wheel must be turned improving performance in… …   Wikipedia

  • Active fire protection — (AFP) is an integral part of fire protection. AFP is characterised by items and/or systems, which require a certain amount of motion and response in order to work, contrary to passive fire protection.AFP falls into two categories1. Fire… …   Wikipedia

  • Active Rollover Protection — (ARP), is a system that recognizes and selectively applies brakes to resist.ARP builds on Electronic Stability Control and its three chassis control systems already on the vehicle Anti lock braking system, traction control and yaw control. ARP… …   Wikipedia