JTEKT Patente

A rotation detection apparatus, a rotation angle detection apparatus, and an electric power steering system are provided which allow appropriate detection of an abnormality in a portion that detects rotation of a rotating shaft. A first arithmetic circuit (51) calculates a rotating direction (D1) and a number of rotations (N1) of the rotating shaft (12a) based on a change in a combination of positivity and negativity of a first electric signal (S1) (first sine signal) and a third electric signal (S3) (first cosine signal). A second arithmetic circuit (52) calculates a rotating direction (D2) and a number of rotations (N2) of the rotating shaft (12a) based on a change in a combination of positivity and negativity of a second electric signal (second sine signal) and a fourth electric signal (second cosine signal). An abnormality determination circuit (53) determines whether each of the first and second arithmetic circuits (51) and (52) is abnormal based on the two rotating directions (D1) and (D2) calculated by the first and second arithmetic circuits (51) and (52), respectively.

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In a steering assist device, a lane keep assist current value calculation unit 51 calculates, based on a lateral deviation y and a lateral deviation change rate dt/dt, a lane keep assist current value Ir4* that makes the lateral deviation y and the lateral deviation change rate dy/dt closer to zero. When the steering direction represented by the sign of control steering torque Ts is the same as the steered direction represented by the sign of the fourth lane keep assist current value Ir4*, a switch unit 53 selects zero received at its second input terminal and outputs zero as a final lane keep assist current value Ir*.

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A steering system includes an outer jacket (21) including a pair of clamped portions (31) disposed on both sides of a slit (30), an inner jacket (20) coated with an insulating coating layer (37) all along an outer periphery (20A) of the inner jacket (20) except for a predetermined area (36), an upper bracket (6) that supports the clamped portions (31) and that is fixed to a vehicle body (22), and a clamping mechanism (7) including a clamping shaft (41) that is supported in clamping shaft insertion holes (34) in the clamped portions (31) so as to be energized. The steering system further includes a conductive elastic member (50) including a first portion (51) engaged with one of a slit inside portion (41D) of the clamping shaft (41) positioned in the slit (30) and the predetermined area (36) so as to be energized and a second portion (52) that slide-contacts the other of the slit inside portion (41D) and the predetermined area (36).

A steering control apparatus is provided which more adequately detects a driver's operating state. A steered-angle command value calculation circuit (54) calculates a steered-angle command value (θt*) by adding a steering torque to a first assist component (Ta1*) that is a sum of a basic assist control amount (Tas*) and compensation components (a hysteresis control amount (Th*) and a damping control amount (Td*)). A steered-angle feedback control circuit (55) calculates a second assist component (Ta2*) by performing angle feedback control based on the steered-angle command value (θt*). A compensation control circuit (52) generates the hysteresis control amount (Th*) and the damping control amount (Td*) based on a determination flag generated by a hand release determination circuit (80) and indicating whether or not the steering state corresponds to a hand release state. The hand release determination circuit (80) determines whether or not the steering state corresponds to the hand release state based on signs of a steering angle (θs) calculated by a steering-angle calculation circuit (70), a steering angular velocity that is a differential value of the steering angle (θs), and a steering angle acceleration.

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There is provided a drive control method for a motor including multiple sets of coils and drive circuits in an electric power steering system. In order to reduce computational load when sensorless control is executed, an electrical angle estimator (110) includes an ±-axis voltage component adder (115) and a ²-axis voltage component adder (116) that add together voltage vectors of a first coil (221) and a second coil (222) expressed in a two-phase fixed coordinate system, an ±-axis current component adder (117) and a ²-axis current component adder (118) that add together current vectors of the first coil (221) and the second coil (222) expressed in a two-phase fixed coordinate system, and an induced voltage computing unit (119) that computes an induced voltage (E) based on an added voltage vector and an added current vector.

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A waterproof structure (100) of an electronic unit (12) includes a case (25) that defines a housing portion (30) housing a first terminal (31), and a connector (26) that includes an insulating body (33) attached to the case (25). The connector (26) includes a second terminal (34) that is supported by the insulating body (33) and connects a conductor end portion (42) of a cable (38) to the first terminal (31) . The insulating body (33) includes a wall portion (35) that partitions a part of the housing portion (30) by covering an open portion (50a) of the case (25). The insulating body (33) includes a cable lead-in portion (36) that defines a cable lead-in hole (39) for leading the cable (38) into the case (25) and is joined to the wall portion (35) . A potting resin (27) is filled in a space between the inner periphery (39a) of the cable lead-in hole (39) and the outer periphery (38a) of the cable (38) and the housing portion (30) and cured.

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A torque sensor includes a pair of magnetic yokes arranged in a magnetic field from a multipolar magnet that rotates integrally with, for example, a first shaft, and the magnetic yokes rotate integrally with, for example, a second shaft. The torque sensor includes magnetic collecting elements magnetically coupled to the respective magnetic yokes and a magnetic flux detecting element. The magnetic collecting elements have a pair of magnetic collecting portions (magnetic collecting protrusions) facing each other. The magnetic flux detecting element includes a circuit board with a cutout formed therein and a Hall IC having a Hall element arranged between the magnetic collecting portions, and the Hall IC is mounted parallel to the circuit board so as to extend over the cutout. At least a part of one of the magnetic collecting portions is arranged in the cutout.

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