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김기영(Giyung Kim),최성호(Seongho Choi),이진구(Jinkoo Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recent trends of research & development for vehicular Anti-lock Brake System (ABS) are focused on the Noise, Vibration and Harshness (NVH) as well as braking performance.. To reduce pulse-up noise & vibration of ABS, we use Linear Flow Control (LFC) concept, which allows continuous pressure rise mode instead of pressure pulse-up by controlling magnetic force of solenoid valve using Pulse Width Modulation (PWM) method to control the current and to compensate for the discrete nature of actuator dynamics by duty control. The realization of stable and repetitive continuous flow control needs sophisticated skills considering road state, pedal efforts and electrical environments.
최성호(Seongho Choi),이진구(Jinkoo Lee),김기영(Giyung Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recent trends of research & development for Vehicular Anti-lock Brake System (ABS) are focused on the NVH as well as braking/traction performance. For the conventional systems, we used On-Off control strategy, which is composed of pulse-up pressure rise, pressure dump and pressure hold mode. The main problems associated with the discrete (On-Oft) nature of this control are severe noise and vibration. Especially, among the three pressure modes of conventional control, the pressure pulse-up is the major source of noise and vibration. To reduce pulse-up noise & vibration of ABS, we introduce Linear Flow Control (LFC) concept, which allows continuous pressure rise mode instead of pressure pulse-up. Continuous pressure rise can be obtained by controlling the magnetic force of solenoid valve, which needs current control of the solenoid valve. In this regard, we proposed using Pulse Width Modulation (PWM) method to control the current and to compensate for the discrete nature of actuator dynamics by duty control. Another source of noise and pedal kickback during ABS action is excessive pumping of brake fluid caused by unnecessarily high motor speed. Because the level of noise and vibration caused by the motor is directly related with the motor speed, we introduced a new Motor Speed Control (MSC) method that could compromise pumping performance and noise. Our new concept ABS also archives better performance in stopping distance compared with conventional control method by reducing average pressure dump and maintaining optimal slip band. In this paper, we will present recent results of LFC & MSC for our new generation ABS in the view of performance and NVH.