An angular rotation sensor system constituted of: an input shaft target and an output shaft target each comprising a plurality of members parallel to a longitudinal axis of an input shaft or output shaft; a gear target with an angular velocity exhibiting a predetermined ratio with an angular velocity of the input shaft, the gear target comprising a plurality of members, each extending away from the input shaft and orthogonal to a plane which is parallel to the longitudinal axis of the input shaft; and a control circuitry arranged to: determine an angular position of the input shaft responsive to a sensed angular rotation of the input shaft target and a sensed angular rotation of the gear target; and determine the amount of torque applied to the input shaft responsive to the sensed angular rotation of the input shaft target and a sensed angular rotation of the output shaft target.

An automatic calibration method of an angle sensor for an automatic drive control system of a farm machine includes the following steps. S1: fixing a steering wheel of the farm machine to make front wheels of a vehicle kept at a fixed angle. S2: collecting a plurality of pieces of current position information of the farm machine, and processing the plurality of pieces of current position information to obtain an average value. S3: establishing a two-wheel farm machine kinematics model based on a center of a rear axle. S4: performing a radius calculation to obtain a set of angle correspondences. S5: rotating the farm machine by a preset angle at a constant speed with the rear axle of the farm machine as a center, and performing S1 through S4. S6: after performing S5 for several times, performing an angle value fitting calculation to obtain a calibration coefficient.

There is provided a control device for an electric power steering device, which determines an estimate of a steering angle instead of using an angle sensor when any abnormality is detected in the angle sensor to perform steering angle control using the determined estimate of the steering angle. When it is determined that the detected steering angle is normal based on a steering angle abnormality determination signal Flg_h, a steering angle calculating section 201 outputs a steering-wheel angle h as an actual steering angle r, while when it is determined that the detected steering angle is abnormal, the steering angle calculating section 201 determines and outputs an estimate r of an actual steering angle using a past value Zr of the actual steering angle under normal conditions, a motor relative angle m, and a relative twist angle of a torsion bar.

A steering angle calculating circuit includes a first neutral point calculating circuit, a second neutral point calculating circuit, and an absolute angle calculating circuit. The first neutral point calculating circuit calculates a motor neutral point (m01), based on a steering angle detected by a steering sensor and a rotation angle of a motor detected by the relative angle sensor, when a drive source for driving a vehicle is started. The second neutral point calculating circuit calculates a motor neutral point when the steering angle detected by the steering sensor falls within a predetermined angle range in which a specific stroke with respect to the steering angle is constant. After the motor neutral point is calculated by the second neutral point calculating circuit, the absolute angle calculating circuit calculates the steering angle as an absolute angle, using the motor neutral point calculated by the second neutral point calculating circuit.

The invention relates to a sensor system (1), and a method for determining an absolute rotation angle () of a shaft (10) with a rotation angle range of more than one revolution and to a vehicle fitted with a sensor system (1), wherein the sensor system (1) has a main rotor (2) that can be connected rotationally synchronously to the shaft (10), a first auxiliary rotor (3) which is mechanically coupled to the main rotor (2), a second auxiliary rotor (4) mechanically coupled to the main rotor (2), a first sensor device (SE1) which is assigned to the first auxiliary rotor (3) for generating a first sensor signal dependent on a rotation angle of the first auxiliary rotor (3), a second sensor device (SE2) which is assigned to the second auxiliary rotor (4) for generating a second sensor signal dependent on a rotation angle of the second auxiliary rotor (4), a third sensor device (SE3) which is assigned to the main rotor (2) and which is used for generating a third sensor signal dependent on a relative rotation angle () of the main rotor (2) and an evaluation device for determining the absolute rotation angle () of the main rotor (2) from the sensor signals of the sensor devices (SE1, SE2, SE3). The detection range () of the third sensor device is less than 360.

A correction circuit receives a steering torque and an electric signal indicative of an operating state of a clutch. The correction circuit selectively uses a first correction value and a second correction value in accordance with the operating state of the clutch. The first correction value is set to correct deviation of the steering torque relative to its zero point when an exciting coil of the clutch is not energized. The second correction value is set to correct deviation of the steering torque relative to its zero point, caused by magnetic flux generated by energization of the exciting coil of the clutch. Adding the first correction value or the second correction value to the steering torque in accordance with the operating state of the clutch suitably corrects deviation of the steering torque relative to its zero point in accordance with the operating state of the clutch.

A system for calibrating a vehicle includes a funnel-type wheel alignment system and an infrastructure system. The infrastructure system is configured to autonomously control a movement of the vehicle within the funnel-type wheel alignment system based on an autonomous marshaling routine and selectively adjust one or more parameters of the autonomous marshaling routine based on one or more calibration metrics generated by the funnel-type wheel alignment system. The funnel-type wheel alignment system is configured to: obtain steering wheel angle data from one or more vehicle sensors, determine a vehicle steering pinion angle offset based on the steering wheel angle data, perform a physical alignment of one or more wheels of the vehicle as the vehicle moves through the funnel-type wheel alignment system, generate the one or more calibration metrics based on the vehicle steering pinion angle offset and the physical alignment, and broadcast the one or more calibration metrics.

An automatic calibration method of an angle sensor for an automatic drive control system of a farm machine includes the following steps. S1: fixing a steering wheel of the farm machine to make front wheels of a vehicle kept at a fixed angle. S2: collecting a plurality of pieces of current position information of the farm machine, and processing the plurality of pieces of current position information to obtain an average value. S3: establishing a two-wheel farm machine kinematics model based on a center of a rear axle. S4: performing a radius calculation to obtain a set of angle correspondences. S5: rotating the farm machine by a preset angle at a constant speed with the rear axle of the farm machine as a center, and performing S1 through S4. S6: after performing S5 for several times, performing an angle value fitting calculation to obtain a calibration coefficient.

A method is used to automatically adjust a steering angle in a steering system of a vehicle. The method includes activating a steering actuator after parking the vehicle such that the steering wheel and the steerable wheels adopt a neutral position.

Distracted driving determination reflects changes in the traveling direction of the vehicle. A distracted driving determination apparatus includes a first obtaining unit obtaining first detection information indicating a gaze or face orientation of a driver, a determiner determining whether the driver is engaging in distracted driving based on the gaze or face orientation of the driver indicated by the first detection information and a first determination condition for detecting distracted driving, a second obtaining unit obtaining second detection information indicating a rotational angle velocity about a vertical axis or lateral acceleration of a vehicle, and a condition changer changing the first determination condition to a second determination condition different from the first determination condition to use the second determination condition in the duration for which the rotational angle velocity or the lateral acceleration failing to satisfy a predefined criterion is being detected based on the second detection information.