To provide an electric parking brake device which accurately estimates at least a torque constant, and which does not use rotational speed information by a rotation sensor when obtaining a torque constant (φ).SOLUTION: There is provided a cutoff current threshold calculation unit (29) for controlling the thrust of a piston. In a current decreasing interval before a current following a rush current generated at the start of energization of an electric motor (24) reaches a constant current interval, at least a voltage value (V) and a current value (I) applied to the electric motor (24) are measured multiple times by a torque constant calculation unit (29). The multiple voltage values and current values are used to set a calculation interval in which a torque constant (φ) can be calculated. The torque constant (φ) is calculated to be estimated in the calculation interval, and a cutoff current threshold is calculated by the cutoff current threshold calculation unit (29) on the basis of the estimated torque constant (φ).SELECTED DRAWING: Figure 6
【課題】少なくともトルク定数を精度よく推定し、しかもこのトルク定数(φ)を求める時に回転センサによる回転速度情報を使用しない電動パーキングブレーキ装置を提供することにある。【解決手段】ピストンの推力を制御するカットオフ電流閾値演算部(29)を備えると共に、電動モータ(24)に通電を開始した時に生じる突入電流の後の電流が電流一定区間に至る前の電流減少区間内で、トルク定数演算部(29)によって、少なくとも電動モータ(24)に印加される電圧値(V)と電流値(I)を複数回に亘って計測し、この複数の電圧値と電流値を用いてトルク定数(φ)を演算可能な演算区間を設定し、この演算区間内でトルク定数(φ)を推定演算し、更に推定されたトルク定数(φ)を基にカットオフ電流閾値演算部(29)によるカットオフ電流閾値の演算を行なう。【選択図】図6
ELECTRIC PARKING BRAKE DEVICE AND ELECTRIC BRAKE DEVICE
電動パーキングブレーキ装置、及び電動ブレーキ装置
2019-06-13
Patent
Electronic Resource
Japanese
IPC: | B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern |
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