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칼만 필터 기반의 전동식 브레이크 실시간 클램핑력 추정
현세라(Sera Hyeon),조성선(Sungsun Cho),박기서(Giseo Park) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
The electro-mechanical brake (EMB) is anticipated by research communities and car manufacturers to be the future adopted brake system due to its advantages. However, to be competitively priced, the high cost load cell of EMB, which measures the clamping force to a disk, should be replaced by a clamping force estimation algorithm. First, in order to determine the point of occurrence of the clamping force, an algorithm is developed to estimate the pad contact point, which represents the contact between the pad and the disk. Then, a new Kalman filter for clamping force estimation is proposed in this paper. In particular, the estimation accuracy is improved by considering both friction torque models in the dynamic state and the stationary state. The performance of the proposed estimation algorithm is validated by comparison with the actual clamping force measured by the load cell sensor on the EMB test bench. At this time, through some stage tests including both steady state and transient state, it can be confirmed whether the performance of the proposed estimation algorithm can be maintained for various clamping force references.
김성환(Kim, Seonghwan),조성선(Cho, Sungsun),이정환(Lee, Junghwan) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.6
This paper deals with experimental evaluation methods for high speed judder on the brake-caliper system. Firstly, two types of brake caliper systems due to the wheel vibration was evaluated. Secondly, the high-speed judder of the brake was also investigated using the subjective rating evaluation in the high-speed road test. These experimental evaluations were carried out by changing the materials of brake pad and the specifications of the brake-corner module. Based upon the test results, a new specification of the brake pad, $15{\times}5$ vertical chamfer, was proposed. The new brake pad showed 3 points, 60 %, improvement in the subjective-rating evaluation comparing with conventional one. Besides, we need to decide properly with judder characteristic of pad material and have to carefully take into consideration other design parameters; caliper, disc, and the braking performance, durability, squeal noise.