公开(公告)号：US20080066994A1

公开(公告)日：2008-03-20

申请号：US11852817

申请日：2007-09-10

申请人： Shuji FUJITA ,  Eiji Kasai ,  Ippei Yamazaki ,  Junro Yamamoto ,  Yasunori Shintani ,  Hideo Kometani

发明人： Shuji FUJITA ,  Eiji Kasai ,  Ippei Yamazaki ,  Junro Yamamoto ,  Yasunori Shintani ,  Hideo Kometani

IPC分类号： B62D5/04 ,  G06F19/00

CPC分类号： B62D5/0463 ,  B62D5/0484 ,  B62D5/049

摘要： When it is determined that the torque output from the electric motor abnormally fluctuates or the torque output from the electric motor varies between clockwise and counterclockwise turning operations of the driver's steering wheel, the steering assist control is continued if the vehicle speed v is equal to or lower than the reference speed v0. In this case, the width of the dead band of the steering torque in the assist map used to calculate the target assist torque is increased. Thus, only in a case where the vehicle is moving at a low speed and the driver's steering wheel is operated with a great force, the steering assist torque is produced to alleviate the burden on the driver. In the other cases, the electric motor is stopped to minimize a sense of discomfort in the steering operation.

摘要翻译： 当确定从电动机输出的转矩异常波动或从电动马达输出的转矩在驾驶员方向盘的顺时针和逆时针转动操作之间变化时，如果车速v等于或等于 低于参考速度v 0。 在这种情况下，用于计算目标辅助转矩的辅助图中的转向转矩的死区宽度增加。 因此，仅在车辆以低速移动并且驾驶员的方向盘以大的力进行操作的情况下，产生转向辅助转矩以减轻驾驶员的负担。 在其他情况下，停止电动马达以最小化转向操作中的不适感。

公开(公告)号：US07406375B2

公开(公告)日：2008-07-29

申请号：US11852817

申请日：2007-09-10

申请人： Shuji Fujita ,  Eiji Kasai ,  Ippei Yamazaki ,  Junro Yamamoto ,  Yasunori Shintani ,  Hideo Kometani

发明人： Shuji Fujita ,  Eiji Kasai ,  Ippei Yamazaki ,  Junro Yamamoto ,  Yasunori Shintani ,  Hideo Kometani

IPC分类号： B62D5/04

CPC分类号： B62D5/0463 ,  B62D5/0484 ,  B62D5/049

摘要： When it is determined that the torque output from the electric motor abnormally fluctuates or the torque output from the electric motor varies between clockwise and counterclockwise turning operations of the driver's steering wheel, the steering assist control is continued if the vehicle speed v is equal to or lower than the reference speed v0. In this case, the width of the dead band of the steering torque in the assist map used to calculate the target assist torque is increased. Thus, only in a case where the vehicle is moving at a low speed and the driver's steering wheel is operated with a great force, the steering assist torque is produced to alleviate the burden on the driver. In the other cases, the electric motor is stopped to minimize a sense of discomfort in the steering operation.

摘要翻译： 当确定从电动机输出的转矩异常波动或从电动马达输出的转矩在驾驶员方向盘的顺时针和逆时针转动操作之间变化时，如果车速v等于或等于 低于参考速度v 0。 在这种情况下，用于计算目标辅助转矩的辅助图中的转向转矩的死区宽度增加。 因此，仅在车辆以低速移动并且驾驶员的方向盘以大的力进行操作的情况下，产生转向辅助转矩以减轻驾驶员的负担。 在其他情况下，停止电动马达以最小化转向操作中的不适感。

公开(公告)号：US20080035411A1

公开(公告)日：2008-02-14

申请号：US11836410

申请日：2007-08-09

申请人： Masaharu Yamashita ,  Eiji Kasai ,  Ippei Yamazaki ,  Shuji Fujita

发明人： Masaharu Yamashita ,  Eiji Kasai ,  Ippei Yamazaki ,  Shuji Fujita

IPC分类号： B62D5/04 ,  B62D6/00

CPC分类号： B62D5/049 ,  B62D5/046 ,  B62D5/0463 ,  B62D5/0484

摘要： When it is determined that a malfunction has occurred in a rotational angle sensor, an electronic control unit changes the control manner from the normal assist control to the sensorless assist control. In the sensorless assist control, an assist stop command unit receives the information concerning the motor rotational angular speed ωm from an angular speed conversion unit. Then, the motor rotational angular speed ωm is compared with the threshold value ωm1. If the motor rotational angular speed ωm is equal to or higher than the threshold value ωm1, an assist enabling signal is transmitted to a PWM voltage production unit to continue the power assist. On the other hand, if the motor rotational angular speed ωm is lower than the threshold value ωm1, a stop command signal is transmitted to the PWM voltage production unit to stop the power assist.

摘要翻译： 当确定在旋转角传感器中发生故障时，电子控制单元将控制方式从正常辅助控制改变为无传感器辅助控制。 在无传感器辅助控制中，辅助停止命令单元从角速度转换单元接收关于电动机旋转角速度ω的信息。 然后，将电机旋转角速度ωgam与阈值omega1进行比较。 如果电动机旋转角速度ωgam等于或高于阈值ω加1，则辅助使能信号被传送到PWM电压产生单元以继续动力辅助。 另一方面，如果电动机旋转角速度ωgam低于阈值ωgam1，则停止指令信号被发送到PWM电压产生单元以停止动力辅助。

公开(公告)号：US07863845B2

公开(公告)日：2011-01-04

申请号：US11994560

申请日：2006-05-09

申请人： Eiji Kasai ,  Yoichi Fujinori ,  Takatoshi Saito ,  Masaharu Yamashita ,  Ippei Yamazaki ,  Shuji Fujita

发明人： Eiji Kasai ,  Yoichi Fujinori ,  Takatoshi Saito ,  Masaharu Yamashita ,  Ippei Yamazaki ,  Shuji Fujita

IPC分类号： H02P1/00

CPC分类号： B62D5/046 ,  H02J1/08 ,  H02J2001/008

摘要： In a power supply apparatus, a power supply circuit includes a primary power supply circuit including a high-voltage battery and a step-down circuit for stepping down the voltage of the high-voltage battery, and a secondary power supply circuit including a low-voltage battery and a step-up circuit for stepping up the voltage of the low-voltage battery. The primary power supply circuit and the secondary power supply circuit are connected in parallel. An output voltage of the secondary power supply circuit is set to be lower than an output voltage of the primary power supply circuit. When the output voltage of the primary power supply circuit becomes lower than a target voltage of the secondary power supply circuit, the voltage stepped-up by the step-up circuit is supplied to a motor drive circuit. Accordingly, power supply backup of an electric power steering apparatus can be performed at low cost.

摘要翻译： 在电源装置中，电源电路包括：主电源电路，包括高压电池和降压电路，用于降低高压电池的电压;以及次级电源电路， 电压电池和升压电路，用于升压低压电池的电压。 主电源电路和副电源电路并联连接。 次级电源电路的输出电压被设定为低于主电源电路的输出电压。 当主电源电路的输出电压低于二次电源电路的目标电压时，由升压电路升压的电压被提供给电动机驱动电路。 因此，能够以低成本进行电动助力转向装置的供电备用。

公开(公告)号：US07481294B2

公开(公告)日：2009-01-27

申请号：US11211759

申请日：2005-08-26

申请人： Shuji Fujita ,  Eiji Kasai ,  Ippei Yamazaki

发明人： Shuji Fujita ,  Eiji Kasai ,  Ippei Yamazaki

IPC分类号： B62D5/04

CPC分类号： B62D15/0245

摘要： The CPU calculates axial force matching external force that acts on a rack bar by combining steering torque MT that acts on a steering shaft with assist torque AT generated by an electric motor. The CPU then determines whether a vehicle is running straight based on a steering angle θ, a vehicle speed V, and the axial force F. Thus, even in a state where a control steering angle midpoint is deviated and a driver applies torque so as to return a turning position of a steering wheel to a neutral position, whether the vehicle is running straight can be accurately determined by making a determination by using the axial force F that acts on the rack bar. The CPU can set a considerably accurate control steering angle midpoint by calculating a smoothed steering angle midpoint by using an instantaneous steering angle midpoint in an accurately determined straight-running state.

摘要翻译： CPU通过将作用在转向轴上的转向转矩MT与由电动机产生的辅助扭矩AT相结合来计算作用在齿条上的轴向力匹配外力。 CPU然后基于转向角θ，车速V和轴向力F来确定车辆是否正在行驶。因此，即使在控制转向角中点偏离的状态下，驾驶员施加转矩，从而 通过使用作用在支架杆上的轴向力F来确定方向盘的转向位置，无论车辆是否直线行驶，都能够将方向盘的转向位置返回到中立位置。 通过在精确确定的直线运行状态下使用瞬时转向角中点来计算平滑的转向角中点，CPU可以设置相当精确的控制转向角中点。

公开(公告)号：US20100044146A1

公开(公告)日：2010-02-25

申请号：US11993149

申请日：2006-10-19

申请人： Eiji Kasai ,  Ippei Yamazaki ,  Shuji Fujita ,  Yuichiro Ido ,  Yutaka Aoki

发明人： Eiji Kasai ,  Ippei Yamazaki ,  Shuji Fujita ,  Yuichiro Ido ,  Yutaka Aoki

IPC分类号： B62D5/04

CPC分类号： B62D5/0481 ,  B62D5/0463

摘要： An electric power steering device, including an electric motor supplied with power from a power supply device to generate a predetermined steering assistance force for a steered wheel, and an assistance control device the controls the amount of electrical power supplied to the electric motor, according to the steering state of a steering wheel. The assistance control device detects the power supply voltage of the power supply device. The assistance control device controls the electrical current supplied to the electric motor, so as to maintain the power supply voltage greater than or equal to a set voltage which is set in advance.

摘要翻译： 一种电动助力转向装置，包括从供电装置供给动力以产生用于转向轮的预定转向辅助力的电动马达，以及辅助控制装置，其控制供给到电动机的电力量，根据 方向盘的转向状态。 辅助控制装置检测供电装置的电源电压。 辅助控制装置控制提供给电动机的电流，以保持电源电压大于或等于预先设定的设定电压。

公开(公告)号：US07694777B2

公开(公告)日：2010-04-13

申请号：US11836410

申请日：2007-08-09

申请人： Masaharu Yamashita ,  Eiji Kasai ,  Ippei Yamazaki ,  Shuji Fujita

发明人： Masaharu Yamashita ,  Eiji Kasai ,  Ippei Yamazaki ,  Shuji Fujita

IPC分类号： B62D5/04

CPC分类号： B62D5/049 ,  B62D5/046 ,  B62D5/0463 ,  B62D5/0484

摘要： When it is determined that a malfunction has occurred in a rotational angle sensor, an electronic control unit changes the control manner from the normal assist control to the sensorless assist control. In the sensorless assist control, an assist stop command unit receives the information concerning the motor rotational angular speed ωm from an angular speed conversion unit. Then, the motor rotational angular speed ωm is compared with the threshold value ωm1. If the motor rotational angular speed ωm is equal to or higher than the threshold value ωm1, an assist enabling signal is transmitted to a PWM voltage production unit to continue the power assist. On the other hand, if the motor rotational angular speed ωm is lower than the threshold value ωm1, a stop command signal is transmitted to the PWM voltage production unit to stop the power assist.

摘要翻译： 当确定在旋转角传感器中发生故障时，电子控制单元将控制方式从正常辅助控制改变为无传感器辅助控制。 在无传感器辅助控制中，辅助停止命令单元从角速度转换单元接收关于电机旋转角速度ωm的信息。 然后，将电机旋转角速度ωm与阈值ωm1进行比较。 如果电动机旋转角速度ωm等于或高于阈值ωm1，则将辅助使能信号发送到PWM电压产生单元以继续电力辅助。 另一方面，如果电动机旋转角速度ωm低于阈值ωm1，则停止指令信号被发送到PWM电压产生单元以停止动力辅助。

公开(公告)号：US20090140673A1

公开(公告)日：2009-06-04

申请号：US11994560

申请日：2006-05-09

申请人： Eiji Kasai ,  Yoichi Fujinori ,  Takatoshi Saito ,  Masaharu Yamashita ,  Ippei Yamazaki ,  Shuji Fujita

发明人： Eiji Kasai ,  Yoichi Fujinori ,  Takatoshi Saito ,  Masaharu Yamashita ,  Ippei Yamazaki ,  Shuji Fujita

IPC分类号： H02P1/00

CPC分类号： B62D5/046 ,  H02J1/08 ,  H02J2001/008

摘要： In a power supply apparatus 40, a power supply circuit is formed by a primary power supply circuit 50 which includes a high-voltage battery 51 and a step-down circuit 55 for stepping down the voltage of the high-voltage battery 51, and a secondary power supply circuit 60 which includes a low-voltage battery 61 and a step-up circuit 70 for stepping up the voltage of the low-voltage battery 61. The primary power supply circuit 50 and the secondary power supply circuit 60 are connected in parallel. An output voltage of the secondary power supply circuit 60 is set to be lower than an output voltage of the primary power supply circuit 50. When the output voltage of the primary power supply circuit 50 becomes lower than a target voltage of the secondary power supply circuit 60, the voltage stepped-up by the step-up circuit 70 is supplied to a motor drive circuit 32. Accordingly, power supply backup of an electric power steering apparatus can be performed as low cost.

摘要翻译： 在电源装置40中，电源电路由主电源电路50形成，主电源电路50包括用于降压高压电池51的电压的高电压电池51和降压电路55， 二次电源电路60包括低电压电池61和用于升压低压电池61的电压的升压电路70.主电源电路50和二次电源电路60并联连接 。 次级电源电路60的输出电压被设定为低于主电源电路50的输出电压。当一次电源电路50的输出电压低于二次电源电路的目标电压 如图60所示，由升压电路70升压的电压被提供给电动机驱动电路32.因此，可以以低成本执行电动助力转向装置的供电备用。

公开(公告)号：US20060070794A1

公开(公告)日：2006-04-06

申请号：US11211759

申请日：2005-08-26

申请人： Shuji Fujita ,  Eiji Kasai ,  Ippei Yamazaki

发明人： Shuji Fujita ,  Eiji Kasai ,  Ippei Yamazaki

IPC分类号： B62D5/04

CPC分类号： B62D15/0245

摘要： The CPU calculates axial force matching external force that acts on a rack bar by combining steering torque MT that acts on a steering shaft with assist torque AT generated by an electric motor. The CUP then determines whether a vehicle is running straight based on a steering angle θ, a vehicle speed V, and the axial force F. Thus, even in a state where a control steering angle midpoint is deviated and a driver applies torque so as to return a turning position of a steering wheel to a neutral position, whether the vehicle is running straight can be accurately determined by making a determination by using the axial force F that acts on the rack bar. The CPU can set a considerably accurate control steering angle midpoint by calculating a smoothed steering angle midpoint by using an instantaneous steering angle midpoint in an accurately determined straight-running state.

摘要翻译： CPU通过将作用在转向轴上的转向转矩MT与由电动机产生的辅助扭矩AT相结合来计算作用在齿条上的轴向力匹配外力。 然后，CUP基于转向角θ，车速V和轴向力F来确定车辆是否直线行驶。因此，即使在控制转向角中点偏离并且驾驶员施加转矩的状态下， 通过使用作用在支架杆上的轴向力F来确定方向盘的转向位置，无论车辆是否直线行驶，都能够将方向盘的转向位置返回到中立位置。 通过在精确确定的直线运行状态下使用瞬时转向角中点来计算平滑的转向角中点，CPU可以设置相当精确的控制转向角中点。

公开(公告)号：US07984786B2

公开(公告)日：2011-07-26

申请号：US11993149

申请日：2006-10-19

申请人： Eiji Kasai ,  Ippei Yamazaki ,  Shuji Fujita ,  Yuichiro Ido ,  Yutaka Aoki

发明人： Eiji Kasai ,  Ippei Yamazaki ,  Shuji Fujita ,  Yuichiro Ido ,  Yutaka Aoki

IPC分类号： B62D5/04 ,  B62D6/00

CPC分类号： B62D5/0481 ,  B62D5/0463

摘要： An electric power steering device, including an electric motor supplied with power from a power supply device to generate a predetermined steering assistance force for a steered wheel, and an assistance control device the controls the amount of electrical power supplied to the electric motor, according to the steering state of a steering wheel. The assistance control device detects the power supply voltage of the power supply device. The assistance control device controls the electrical current supplied to the electric motor, so as to maintain the power supply voltage greater than or equal to a set voltage which is set in advance.

摘要翻译： 一种电动助力转向装置，包括从供电装置供给动力以产生用于转向轮的预定转向辅助力的电动马达，以及辅助控制装置，其控制供给到电动机的电力量，根据 方向盘的转向状态。 辅助控制装置检测供电装置的电源电压。 辅助控制装置控制提供给电动机的电流，以保持电源电压大于或等于预先设定的设定电压。