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승용차 ABS의 하이드로릭 유닛, 센서, 컴퓨터에 관련된 트라이볼로지적인 고장사례 고찰
이일권(IlKwon Lee),한재오(JaeOh Han),이정호(JongHo Lee),이영숙(YoungSuk Lee),김추하(ChooHa Kim) 한국트라이볼로지학회 2014 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.30 No.3
In this paper, we present our analysis of tribological failure examples for an anti-lock brake system(ABS) in a car. The study range of this paper is to improve the quality of ABS system by analyzing with sensor, computer, actuator and oil lines. In the first example, the brake leak from hydraulic supply line in a caliper on the rear left side of the ABS hydraulic modulator. This produces the sponge phenomenon, where the car does not brake even when the driver operates the brake pedal. The hydraulic unit operating ABS is actuator that play role regulating drive condition according with the oil pressure supplied with wheel of a car. In the second example, the service man does not completely tighten the fixed bolt after repairing the car. This causes the ABS warning lamp to light up as the ABS wheel speed sensor cannot detect whether the ABS has been activated. In the third example, the ABS electronic control unit is separated from the soldered part of the inner circuit board. Consequently, the ABS fails in control because the ABS motor pump receives no-signal for the hydraulic unit. The wheel speed sensor has to large durability because of giving signal of acting condition to computer by detected the acceleration and deceleration of wheel of a car. In the fourth example, the ABS warning lamp lights up of when cracks propagate in the circuit board soldering part. The circuit of this computer is very important part for input and output the operating signal of system. Such failures can aggravate the durability of the ABS. Thus, the ABS needs to be optimized to eliminate malfunction phenomenon.
최진영(Jinyoung Choi),김세환(Se-hwan Kim),박승태(Seungtae Park),이정호(Jongho Lee) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The mixed cooling dryer has been developed significantly by adopting both advantages of cooling dryers and desiccant dryers. In this study, it is introduced that the desired effect, such as drying rate period reduction and energy-saving, could be achieved only by adding the desiccant dryer if an existing cooling dryer is used. The experiment should be conducted for quite long time due to the material selection, so it is regrettable that there are not enough data.