JTEKT Patente

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A power source system (1) has a power supply recipient (20) that operates by consuming power from a main power source (30) of a vehicle, and a power source device (10) that backs up power supply to the power supply recipient (20). Upon recognizing that a power switch (31) of the vehicle has been turned off, the power supply recipient (20) generates a stoppage permission signal (S2). The power source device (10) determines that an abnormality has occurred in a power source line (L2), on which the power switch (31) is provided, of a power supply path (L1 to L8) between the main power source (30) and the power supply recipient (20), when a first determination condition, a second determination condition, and a third determination condition are all met. The first determination condition is that voltage (V₁) on the power source line (I2) is lower than a voltage threshold value (V_1th). The second determination condition is that the power source device (10) has not received the stoppage permission signal (S2). The third determination condition is that a communication state between the power source device (10) and the power supply recipient (20) is normal.

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A shaft component for manufacture of a bearing raceway component including a power transmission portion having teeth by carburizing or carbonitriding includes a columnar or cylindrical shaft member. The shaft member has a central axis. The shaft member includes a first portion on a first axial side, and a second portion on a second axial side of the first portion. The first portion is integrated with the second portion. The first portion is made of a first steel material as a raw material. The second portion is made of a second steel material as a raw material. The first portion includes a portion serving as a raceway. The second portion includes a portion serving as the teeth. An alloy composition of the first steel material is different from an alloy composition of the second steel material. A third portion includes a joining surface connected to the second portion on the second axial side of the first portion. A fourth portion includes a joining surface connected to the first portion on the first axial side of the second portion. A fifth portion is located in the first portion on the first axial side of the third portion. A sixth portion is located in the second portion on the second axial side of the fourth portion. A hardness of the third portion is greater than a hardness of the fifth portion. A hardness of the fourth portion is greater than a hardness of the sixth portion. The portion serving as the raceway is located in the fifth portion and is not located in the third portion.

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The input-dependent variable calculation processing is processing of calculating a value of an input-dependent variable in accordance with a steering intent of a driver. The arbitration processing is processing in which the value of the input-dependent variable and an external request value are inputs, and also a value of a target steered angle variable is an output. The operation processing is processing in which an actuator is operated. The target value setting processing is processing in which the value of the target steered angle variable output by the arbitration processing is an input, and also a target yaw rate is an output. The reflection processing is processing for reflecting a manipulated variable of feedback control, in which the target yaw rate is a target value of the controlled variable, in operation of a steered angle by the operation processing.

A steering device (1) includes an inner tube (3), a drive unit (5), and an energy absorption part (7). The inner tube (3) is mounted to a column housing (9) to be movable to the column housing (9). The drive part (5) includes an output part (11) and a body (13) mounted to the column housing (9), and configured to drive the inner tube (3) by the output part (11). The energy absorption part (7) is formed as a unit, arranged between the inner tube (3) and the drive part (5), and configured to absorb an impact force applied to the inner tube (3).

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A control device (80, 90) is configured to execute a towing information acquisition process and a towing process. The towing information acquisition process is a process of acquiring information regarding whether the tractor is towing a trailer. The towing process is a process of operating an operation target in accordance with a value of an operation input variable determined so as to attenuate a yaw response of the vehicle to a turning instruction operation when the tractor is towing the trailer compared to when the tractor is not towing the trailer. The operation target is at least one of the following three systems: a steering system, a drive system, and a braking system. The operation input variable is a variable that determines an input signal to the operation target.

A control device (80, 90) is configured to execute an acquisition process and a notification process. The acquisition process is a process of acquiring a value of a steered angular velocity variable. The steered angular velocity variable is a variable indicating the rate of change in the steered angle of the tractor. The notification process is a process of, when the absolute value of the value of the steered angular velocity variable is greater than or equal to a threshold, notifying of a possibility of occurrence of a sway phenomenon of the trailer (10) by operating a notification device. The notification device (116) is an interface configured to convey information to a person.

A steering control device (50) controls a motor (21). The motor drives a steering system (10) that steers a steered wheel (12) of a vehicle. The steering control device (50) performs feedback control such that an actual angle (θ<p>) of a shaft (23) that rotates in conjunction with a steering operation of the steered wheel (12) follows a target rotation angle (θ<p_med>* ); calculates, based on a state variable (θ<p_med>* ) of the vehicle, an estimated value (ζ) of a human body motion indicator representing human body motion that affects ride comfort or discomfort of a vehicle occupant; determine whether the human body motion indicator (ζ) has reached a level at which it is to be suppressed, based on the estimated value (ζ) of the human body motion indicator; and when it is determined that the human body motion indicator has reached the level at which it is to be suppressed, correct the target rotation angle (θ<p_med>* ) such that the human body motion indicator is suppressed.

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