Performance Prediction and Flow Characteristics of a Hydraulic Pump for ABS and ESC Systems Using FSI Simulation
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ght © 2020 KSAE/ 11809 pISSN 12299138/ eISSN 19763832
PERFORMANCE PREDICTION AND FLOW CHARACTERISTICS OF A HYDRAULIC PUMP FOR ABS AND ESC SYSTEMS USING FSI SIMULATION Jang-oh Mo1) and Young-ho Lee2)* CFD Application Division, ATES Inc., 184-1, Woolim e-Biz, Guro-dong, Guro-gu, Seoul 08377, Korea 2) Division of Mechanical Engineering, Korea Maritime and Ocean University, Busan 49112, Korea
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(Received 21 May 2019; Revised 26 December 2019; Accepted 3 February 2020) ABSTRACTThe electronic stability control (ESC) system is a computerized technology that improves vehicle stability by detecting and reducing the loss of traction. The hydraulic control unit for an anti-lock braking system (ABS) or an ESC system in a car includes a hydraulic pump located between the wheel and master cylinder. The function of the hydraulic pump is to allow the brake fluid to return from the wheel to the master cylinder when the ABS or ESC is actuating. This study performs numerical investigations with the aim of predicting the performance of the hydraulic pump by better understanding the dynamic behavior characteristics of the inlet ball under instantaneous fluid forces during the suction cycle and the corresponding flow characteristics under various motor speeds. A fluid-structure interaction (FSI) simulation of the hydraulic pump is conducted under various motor speeds with an unsteady three-dimensional approach considering laminar flow and the user-defined function (UDF). Experimental verification of the simulation results at the standard pump pumping test system of the Mando Corporation in Korea indicates considerable reliability. The findings of this research can provide valuable insights into designing high-efficiency pumps. KEY WORDS : Anti-lock braking system (ABS), Electronic stability control (ESC), Hydraulic pump, Fluid-structure interaction (FSI) Simulation, User-defined function (UDF)
NOMENCLATURE Ffluid Fpressure Fspring Ftotal Fviscous k Linit_disp Lref Lvalve m T* ·· x Vt Vt-t xt xt-t t
computerized technology that improves vehicle stability by detecting and reducing loss of traction (National Highway Traffic Safety Administration, 2007). The system controls the braking force and driving force with an anti-lock braking system (ABS) and traction control system (TCS) that prevent the vehicle from slipping to the left and right by analyzing the road and driving environment through data obtained from various vehicle sensors (Jeong et al., 2015). Intelligent safety vehicles have been the focus of many studies aimed at developing the next generation of smart vehicles based on active control technology and employing cutting-edge electronic and IT technologies (Jeong et al., 2015; Kim et al., 2015). An ESC system has two main components: an electronic control unit (ECU) to determine optimal driving conditions and a hydraulic control unit (HCU) to offer hydraulic power for wheel pressure generation. The HCU plays a particularly important role in achieving a stable attitude control of a vehicle by adjusting each individual
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