Introduction:
Due to the purposes of enhancing safety while driving, vehicles are normally outfitted with the electronic anti-clock system (ABS) … as a component of the breaking system to take care of the safety of the vehicle while driving. As a result, its reliability is critical. All the ABS components are two-state factors which are characterized by 2 states; the state of ability and the state of inability.
ABS operations focus in managing the wheel spin lengthwise (by way of controlling the braking system pressure) so as to retain the spin within the limits of the maximum interval, for instance, the interval by which the adhesive force valves are close to optimum (Erickson 189).
Six systems are capable of being differentiated among the units of ABS. They are distinguishable in their braking division, the number of channels for pressure control and the wheel speed sensor numbers. Regarding the braking control function, these solutions are classified into:
Diagonal
Rear or front
Concerning the channels for pressure control numbers, they include the following systems.
The units that have 2 pressure control channels (two channel ones)
The units with 3 pressure control channels (the 3 channel ones)
The units with 4 pressure control channels (the 4 channel ones)
When it comes to the wheel speed sensor numbers, the below systems are differentiated.
The ones that have two wheel speed censors
The ones that have three wheel speed sensors
And the last one is the one with four wheel speed sensors.
In the incidence of the failure of the hydraulic brake system (circuit), the driver does have the time or chance to brake. Thus, the hydraulic system is compartmented into 2 circuits to improve the reliability of the braking system. Therefore, when one circuit fails, the other one remains fully operational and the driver is able to brake.
Fault tree analysis:
Incident tree diagrams offer a coherent representation of the probable outcomes subsequent hazardous occurrence. Fault tree analysis offers an inductive method to risk and reliability evaluation and are designed applying forward logic.
Hence, the system may be delivered as a parallel series framework.
562927517811750058007259810750048768001381125Brake caliper of right rear wheel
00Brake caliper of right rear wheel
38385751381125Brake caliper
of left rear wheel
00Brake caliper
of left rear wheel
29527501438275Pressure limiting/proportioning valve
00Pressure limiting/proportioning valve
20288251485900Rear wheel solenoid valves,
00Rear wheel solenoid valves,
11525251485900Pipes delivering brake
fluid
00Pipes delivering brake
fluid
-161925120015000-161925168592500508635059055000-7715255334000089535017335500044958001781175003657600178117500269557517335500018192751733550001714501438275Section 2 of master cylinder
00Section 2 of master cylinder
571500304800Section 1 master cylinder
00Section 1 master cylinder
4229100533400004410075304800brake caliper of right front wheel,
00brake caliper of right front wheel,
3495675304800– brake caliper of left front whee
00– brake caliper of left front whee
3295650533400002505075304800Front wheel solenoid valves
00Front wheel solenoid valves
2343150533400001562100304800Brake fluid pipes
00Brake fluid pipes
134302553340000
Fig 1. Corrected analytical flaw, using the eight, numbered, basic events.
Once the diagram has been created, failure and repair gets to be equipped into the components of the system (Erickson 198). There after analysis is carried out, to determine the reliability and parameter availability for the system and establish the crucial components.
Cited work:
Erickson, C. Hazard Analysis Techniques for System Safety. John Wiley & Sons, Inc. (2005). Print.
