Abstract:
본 발명은 압축 착화 방식의 엔진에서 엔진 블록에 설치되는 가속도 센서를 이용하여 엔진의 진동을 측정하고, 측정된 엔진 진동신호의 분석을 통해 엔진의 연소시기를 판별하는 것이다. 본 발명은 엔진의 연소로 발생되는 블록 진동 신호를 측정하는 과정, 블록 진동에서 분석하고자 하는 주파수 영역을 설정한 다음 웨이블렛 스케일로 분할하는 과정, 분할된 웨이블렛 스케일에 대하여 연속적인 웨이블렛 변환을 실행하여 시간에 따른 결과 값을 추출하고, 이전 스케일의 결과 값과 이후 스케일의 차이 값을 계산하는 과정, 계산된 차이 값과 설정 값을 비교하여 설정 값을 초과하면 해당 시점의 크랭크 각도를 저장하는 과정, 전체 웨이블렛 스케일에 대한 비교가 완료되면 저장된 크랭크 각도를 평균하여 연소시기를 판별하는 과정을 포함한다. 연소시기, 웨이블렛 변환, 블록 진동, 가속도 센서
Abstract:
PURPOSE: A cathode material is provided to realize a high capacitance and a high power by inserting a lithium ion into a cathode material through an ion exchange method, thereby being variously applied to a high-capacity lithium secondary battery for an electric car, a mobile device, a high-capacity power storage system, and the like. CONSTITUTION: A cathode material for a lithium secondary battery includes a lithium transition metal based fluorophosphates compound, which is represented by Chemical Formula 1 of Li2MPO4F and has a crystalline structure of a P2_1/n space group. Here, P means that lattice points exist at only eight vertexes in a parallelepiped structure; 2_1 means the presence of a two-fold rotation screw axis by a translation of 1/2 of a lattice vector; and n means the presence of a glide plane by a translation of 1/2 of the diagonal length of a unit lattice in a diagonal direction. In Chemical Formula 1, M is a transition metal selected from Mn, Sc, Ti, V, Cr, Fe, Co, Ni, and Cu.
Abstract:
PURPOSE: A combustion time discriminating method of a compression-ignition engine and an apparatus thereof are provided to control a direct injection type compression-ignition engine by analyzing the vibration signal of the engine block. CONSTITUTION: A combustion time discriminating method of a compression-ignition engine comprises following steps. A block vibration signal which is generated by the combustion of an engine is measured(S101). After establishing a frequency domain(S102) to be analyzed in the block vibration, a wavelet scale is partitioned(S103). The successive wavelet transform is enabled on a wavelet scale(S104), and the return value is extracted according to the time. The difference value of the scale is calculated(S105).
Abstract:
본 발명의 예시적인 실시예들에 따른 리튬 이차전지의 양극 소재용 복합체를 개시한다. 상기 복합체는 제1 전이금속 화합물 및 리튬 화합물을 포함한다. 상기 제1 전이 금속 화합물은 결정구조를 가지며, 일반식 A X B Y 를 가진다. 상기 리튬 화합물은 일반식 Li W C Z 를 가지며, 상기 제1 전이금속 화합물 사이에 균일하게 분포되어 있으며, 상기 제1 전이금속 화합물과 연속되지 않는 결정구조를 갖는다. 이때, A는 Fe, Mn, Ni, V, Co, Ti, Sc, Cr, Cu 및 Zn으로부터 선택된 전이 금속이고, B는 O, C, F, S, Cl, Se, I, N, H, (NO 3 ), (PO 4 ), (SO 4 ), (P 2 O 7 ), (PO 4 F), (SiO 4 ), (CO 3 ), (BO 3 ) 및 (SO 4 F)으로부터 선택되며, C는F, O, H, N, P, Cl, I, S로부터 선택되고 및 0<X≤4, 0≤Y≤6, 0<W≤3 및 0<Z≤1 이다.
Abstract:
PURPOSE: A composite material for cathode materials in lithium rechargeable battery is provided to show excellent activation and broaden the width of the material. CONSTITUTION: A composite material (100) comprises the first transition element (110) with a crystal structure and chemical formula 1: AXBY, a lithium compound (120) with a crystal structure with the first transition compound. The lithium compound comprises chemical formula 2: LiWCZ and is spread evenly to the first transition compound. A is a transition compound chosen from Fe, Mn, Ni, V, Co, Ti, Sc, Cr, Cu and Zn and B is chosen from O, C, F, S, Cl, Se, I, N, H, (NO3), (PO4), (SO4), (P2O7), (PO4F), (SiO4), (CO3), (BO3) and (SO4F). C is chosen from F, O, H, N, P, Cl, I and S and the range is 0
Abstract:
A kickdown control method for a continuously variable transmission for a vehicle, in which an acceleration response can be increased, comprises the steps of: determining if conditions for kickdown are satisfied; rapidly discharging a primary pressure from a primary pulley if it is determined that the conditions for the kickdown are satisfied; and regulating a primary pressure solenoid duty ratio to a null position to prevent an engine speed from suddenly increasing, and controlling a gear ratio by performing a feedback control.