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This paper describes the control of a solenoid valve of ESC(Electronic Stability Control) with hydraulic modulator in braking system. ESC ECU(Electronic Control Unit) to control the high-frequency control and slope control method was applied, the surge pressure and EMI(electromagnetic interference) reduction characteristics were studied. The stage of ECU output was added the slope shaping function to reduce electromagnetic emission at higher frequencies. Measurements show that this high frequency ECU manages to reduce the surge pressure and electromagnetic emission by the control of solenoid valve. In conclusion, by using the results of this study for the high frequency ECU control, we could expect enhancement of braking system performance. Key Words : Electronic Stability Control, Electronic Control Unit, Pulse Width Modulation, Slope Control * Corresponding Author : Kyu-Bong YeonTel: +82-41-559-3168 email: kbyeon@katech.re.kr 12 03 26  12 04 27  12 06 07

Study on the Characteristics of Control by High Frequency ECU for Braking System