A steering system to steer wheels by a movement of a steering shaft, including: the steering shaft; an electric motor; a converter configured to convert a rotational motion of the motor into the movement of the steering shaft; a motor rotation angle obtainer configured to obtain a motor rotation angle from a zero point position; a movement-amount-related-amount obtainer configured to obtain a movement-amount-related amount that is a movement amount of the steering shaft from a neutral position or a physical amount in a one-to-one correspondence with the movement amount; and a controller including a malfunction detector configured to detect a presence or absence of a malfunction of the converter in a mode that differs depending on a temperature state of the steering system, based on the motor rotation angle from the zero point position obtained by the motor rotation angle obtainer and the movement-amount-related amount obtained by the movement-amount-related-amount obtainer.

An automatic steering system comprises a controller. The controller executes target steering angle calculation processing. The controller further calculates a learning value of lateral acceleration. The learning value is calculated based on an error of a detected value of the lateral acceleration by an acceleration sensor and an estimation value of the lateral acceleration calculated using driving speed and yaw rate. In the target steering angle calculation processing, it is judged whether the acceleration sensor is normal. If it is judged that the acceleration sensor is normal, a target steering angle is calculated by using the detected value. Otherwise, the lateral acceleration used to calculate the target steering angle is switched from the detected value to a backup value of the lateral acceleration. The backup value is calculated using the estimation value and the learning value calculated before a timing at which the acceleration sensor is judged to be abnormal.

A speed reducer according to the present invention includes: at least one gear member for changing a speed of rotations input from a rotary device and outputting the rotations; a case housing the gear member; and a heating unit provided on the case and configured to heat the case or an inside of the case.

A wiring method during which an electrical cable is connected, the cable including one or more conductive wires, to an electrical apparatus, such as a drive computer unit for assisted steering, by means of a non-sealed connector which includes a male portion placed in a junction box and connected to the electrical apparatus, and a female portion connected to the electrical cable, as well as retaining members for fixing the female portion on the male portion in order to create an electrical junction between the respective conductive terminals of the portions, the connector is then covered, after connection, with an enrobing polymer material which forms a sealed shell which protects the electrical junction at least from water.

An electrically operated steering system (1) is provided for a vehicle (2) with a rack (3) for attaching the steering system (1) to a frame of the vehicle (2), two steerable wheels (4) that are pivotably attached to the rack (3), a rod element (5) arranged on the rack (3), which is slidable in its longitudinal direction in relation to the rack (3), a kinematic unit (13), which is coupled to the rod element (5) and which transforms a movement of the rod element (5) into a steering rotation of the wheels (4), an electric machine (6), which is mechanically connected to the rod element (5) for effecting the movement of the rod element (5), and a lateral force absorbing mechanism (7), which is configured for absorbing a lateral force produced by the kinematic unit (13) in relation to the rod element (5).

A rack and pinion assembly for a steering assembly is disclosed. The rack and pinion assembly has: a housing; a rack disposed in the housing, the rack being translatable in the housing; a pinion engaging the rack for causing translation of the rack; and at least one rolling element connected to the rack. The at least one rolling element is translatable with the rack. The at least one rolling element rolls along an inner surface of the housing as the rack translates. A steering assembly having the rack and pinion assembly and a vehicle having the steering assembly are also disclosed.

A torque compensation apparatus for a Motor Driven Power Steering (“MDPS”) system including: a column torque sensor configured to detect column torque applied to a steering shaft; a steering angle sensor configured to detect a steering angle of a steering wheel; and a controller configured to calculate a compensation ratio by sudden steering, based at least one of the column torque detected by the column torque sensor and a steering angular velocity calculated from the steering angle detected by the steering angle sensor. The basic assist torque outputted from the MDPS system is then compensated for according to the compensation ratio.

A first circuit energizes a steering assist actuator to electrically assist steering of a driver. A second circuit is provided in a same housing as the first circuit and energizes a positional actuator to move a steering position. A controller operates the first and second circuits to control operations of the steering assist actuator and the positional actuator. The controller changes a priority between the first circuit and the second circuit in a start period, in which the steering control device is started, a normal operation period, in which the steering control device is operated normally, and a stop period, in which the steering control device is stopped. The priority includes at least one of an order of operating the first circuit and the second circuit, output allocation between the first circuit and the second circuit, and output magnitude between the first circuit and the second circuit.

A control device controls a multi-phase rotating machine having two multi-phase winding sets of two systems and outputting a torque to a common output shaft. The control device includes: two electric power converters individually connected to two power supplies and supplying an AC electric power to the multi-phase winding sets; and a control unit. The power supplies includes a charge side power supply and a discharge side power supply. The control unit energizes a charge side system and a discharge side system with reciprocal currents, and executes a charge operation from the discharge side power supply to the charge side power supply via the multi-phase rotating machine.

To provide an electric driving device and an electric power steering device with a smaller area of power supply wiring in a circuit board and higher reliability of the circuit board. An electric driving device includes a motor and an electronic control unit that controls rotation of the motor. The electronic control unit includes a first circuit board, a second circuit board, a power supply wiring module, and a heat sink. The first circuit board is provided with a transistor that outputs an electric current to excite a motor coil. The second circuit board includes a control circuit that controls an electric current supplied to the transistor. The power supply wiring module is configured by molding, with resin, a choke coil for noise removal, a capacitor, and wiring that supplies electric power to at least one of the first circuit board and the second circuit board. The heat sink is sandwiched between the power supply wiring module and the second circuit board.