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公开(公告)号：US20190135135A1
公开(公告)日：2019-05-09
申请号：US16242641
申请日：2019-01-08
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
Abstract: Provided is an electric brake device that achieves improved responsiveness, cost reduction and also reduces the copper loss in an electric motor, thus reducing power consumption. The electric brake device includes a brake rotor (8), a friction member (9), a friction member actuator (6), an electric motor (4), a controller (2), a main power supply (3), and an auxiliary power supply (22). The auxiliary supply (22) is charged with regenerative power from the motor (4). The controller (2) includes a backflow power interruption (26) preventing the main supply (3) from being charged with the regenerative power from the motor (4), and an auxiliary power supply controller (24) causing the auxiliary supply (22) to supply running power to the motor (4) when powering the electric (4) is started in a state in which the regenerative power in the auxiliary supply (22) is greater than or equal to a set voltage.
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公开(公告)号：US20190123616A1
公开(公告)日：2019-04-25
申请号：US16225430
申请日：2018-12-19
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
Abstract: The electric linear motion actuator includes an electric motor, a linear motion mechanism, and a housing. The linear motion mechanism and the electric motor are arranged side by side on the same axis which is an axis of a rotation input-output shaft of the linear motion mechanism. The electric motor includes a stator and a rotor which are arranged such that directions of magnetic poles that generate interlinkage flux contributing to torque generation are parallel with a rotation shaft of the electric motor. The rotation shaft of the electric motor and the rotation input-output shaft serve as a rotary member formed of a plurality of coupled members. The rotary member is held with respect to the housing by a restricting part that is common to holding in an axial direction and a radial direction of the rotation shaft.
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公开(公告)号：US20180194334A1
公开(公告)日：2018-07-12
申请号：US15915829
申请日：2018-03-08
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
IPC: B60T8/1761 , F16D65/18 , B60T8/172 , B60T8/32 , B60T13/74
Abstract: Both of a quiet operation with smaller torque variation for prioritizing NVH and a high torque operation or high output operation for prioritizing torque or output may be provided by selectively using, based on requests, a control scheme that reduces torque variation and a control scheme that maximizes a torque. A motor current calculator may be capable of selectively using an output prioritizing control scheme that prioritizes a torque output and a torque variation suppressing control scheme that prioritizes smaller torque variation. An output requirement determiner may be provided to calculate a degree of importance of suppressing torque variation of an electric motor, based on one or both of a braking request and a travel condition of a vehicle. In accordance with this determination result, the motor current calculator may selectively use the output prioritizing control scheme and the torque variation suppressing control scheme.
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公开(公告)号：US20180154873A1
公开(公告)日：2018-06-07
申请号：US15888585
申请日：2018-02-05
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
CPC classification number: B60T8/172 , B60T13/74 , B60T13/741 , F16D65/18 , F16D66/00 , F16D2121/24 , F16D2125/34 , H02P15/00
Abstract: A controller of the electric brake device includes a reaction force compensator to perform compensation such that a rotational resistance, of an electric motor, generated by a reaction force to a pressing force of a friction member against a brake rotor is cancelled out. The reaction force compensator includes: a direct estimator to directly estimate the reaction force from information including at least either a drive voltage or current of the electric motor and at least either a rotational angle of the electric motor or a value obtained by differentiating the rotational angle one or more times; an indirect estimator to estimate the reaction force from an estimated braking force on the basis of a set correlation; and a compensation reaction force determiner to determine a reaction force, to perform the compensation, by using estimation results of direct estimation and indirect estimation at predetermined proportions.
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公开(公告)号：US20180072295A1
公开(公告)日：2018-03-15
申请号：US15817595
申请日：2017-11-20
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
Abstract: This electric brake device includes: a brake rotor; a friction member; friction member operator configured to bring the friction member into contact with the brake rotor; an electric motor configured to drive the friction member operator; and a controller configured to control a braking force by means of the electric motor. The controller includes: heat balance degree estimator configured to estimate a balance degree among heat generation amounts of a plurality of exciting coils in the electric motor; and heat load balancing section configured to decrease a heat generation amount of a specific exciting coil when the heat balance degree estimator has estimated that the heat generation amount of the specific exciting coil among the plurality of exciting coils is larger than heat generation amounts of the other exciting coils.
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Patent Agency Ranking
公开(公告)号：US20180065607A1
公开(公告)日：2018-03-08
申请号：US15800656
申请日：2017-11-01
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
CPC classification number: B60T8/885 , B60R16/033 , B60T8/17 , B60T8/172 , B60T8/321 , B60T8/58 , B60T13/74 , B60T13/741 , B60T17/18 , B60T2220/04 , B60T2270/414 , F16D65/18
Abstract: An electric brake system includes a plurality of electric brake devices. A control device of each electric brake device includes: an abnormality determination section that determines whether there is abnormality in supply of power from a power supply device to the electric brake device; and a redundant function control section that, when the abnormality determination section has determined that there is abnormality in supply of power, controls the braking force by using an auxiliary power supply in accordance with a predetermined condition. The redundant function control section controls the braking force by using the auxiliary power supply at least when a desired braking force cannot be output even with all the electric brake devices for which the abnormality determination section has determined that there is no abnormality in supply of power, as the predetermined condition.
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公开(公告)号：US20180009426A1
公开(公告)日：2018-01-11
申请号：US15711503
申请日：2017-09-21
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
CPC classification number: B60T13/746 , B60T13/74 , F16D65/18
Abstract: An electric brake device includes: a brake rotor; a friction member; friction member contactor; an electric motor; braking force estimation unit; and a control device. The control device has a control system in which a motor rotation angle of the electric motor is included in a state quantity in a control computing of a follow-up control. The control device includes a state quantity reset function unit that resets at least the motor rotation angle to a predetermined value, on the basis of a predetermined condition using at least one of a target braking force, an estimated value of a braking force, an amount of change of a target braking force, an amount of change of an estimated value of a braking force, and a deviation between a target braking force and an estimated value of the braking force.
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公开(公告)号：US20170217409A1
公开(公告)日：2017-08-03
申请号：US15486892
申请日：2017-04-13
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
CPC classification number: B60T8/172 , B60T7/12 , B60T8/17 , B60T13/74 , B60T13/741 , F16D55/225 , F16D65/18 , F16D2121/24 , F16D2125/34
Abstract: Improved maneuverability, improved followability towards a target braking force and enhanced brake feeling when a low braking force is being effected may be achieved. A brake controller unit may include a clearance estimator which may be configured to use a rotational angle θ of a motor to estimate a clearance, inclusive of negative values, between a frictional material and a brake. A target braking force Fr may be compared with a switch-determining braking force Frsw, so that clearance control based on a target clearance Cr may be performed when the frictional material is in approximate-contact state corresponding to the target braking force Fr being low, and so that braking force control may be performed when it is equal to or greater than the switch-determining braking force Frsw.
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公开(公告)号：US20170072931A1
公开(公告)日：2017-03-16
申请号：US15342611
申请日：2016-11-03
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
CPC classification number: B60T13/741 , B60T8/00 , B60T8/17 , B60T8/58 , B60T13/74 , F16D65/18 , F16D66/00 , F16D2121/24
Abstract: A brake controller is provided with a positive efficiency operation limiter configured to provide a time for maintaining or decreasing a torque to be generated by a motor, such that a braking force generated by pressing between a brake rotor and friction pads does not decrease, while a braking force command value outputted from a braking force command section increases. For example, the limiter limits a ratio of a time for increasing the braking force, relative to a sum of the time for increasing the braking force and the time for maintaining or decreasing the braking force, to a predetermined value or less.
Abstract translation: 制动控制器设置有正效率操作限制器，其被配置为提供用于维持或减小由电动机产生的转矩的时间，使得由制动转子和摩擦垫之间的按压产生的制动力不会降低，而 从制动力指令部输出的制动力指令值增大。 例如，限制器将用于增加制动力的时间相对于用于增加制动力的时间的总和与用于维持或降低制动力的时间的总和的比率限制到预定值或更小。
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公开(公告)号：US20160123419A1
公开(公告)日：2016-05-05
申请号：US14894539
申请日：2014-06-06
Applicant: NTN CORPORATION
Inventor： Yui MASUDA
IPC: F16D65/18 , B60T13/74 , F16D55/225
CPC classification number: F16D65/18 , B60T13/741 , F16D55/225 , F16D55/226 , F16D65/12 , F16D2121/24 , F16D2125/40 , F16D2125/50
Abstract: A brake device includes a control device which performs feedback control using a braking force of a linear motion mechanism as a controlled variable. The control device includes a computing unit for computing an operating quantity (voltage applied to an electric motor) for canceling out fluctuations in braking force, and a frequency detector for detecting the frequency of the operating quantity. The control device further includes an operating quantity limiting unit which limits the operating quantity according to a predetermined parameter when the detected frequency is higher than a predetermined frequency threshold, i.e. when the detected frequency is in a high-frequency range in which the permissible value of the braking force fluctuations is high, whereby it is possible to reduce the output of the electric motor within a range in which the braking force fluctuations does not exceed the permissible value, thereby reducing the power consumption.
Abstract translation: 制动装置包括使用直线运动机构的制动力作为受控变量执行反馈控制的控制装置。 控制装置包括用于计算用于消除制动力波动的操作量（施加给电动机的电压）的计算单元和用于检测操作量频率的频率检测器。 控制装置还包括操作量限制单元，当检测到的频率高于预定频率阈值时，即当检测到的频率处于高频范围内时，根据预定参数来限制操作量，其中允许值 制动力波动较大，从而可以在制动力波动不超过容许值的范围内减少电动机的输出，从而降低功耗。
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