The failure detection device includes: an output unit detecting failure of a torque detection device that detects torque applied to a pinion shaft with torque sensors, and a target current calculation unit controlling drive of the electric motor. In response to detection of failure of one of the torque sensors, the target current calculation unit causes the motor to output continuous torque continuously generating torque that is detectable by the other of the torque sensors and, in response to the motor outputting the continuous torque, the output unit diagnoses failure of the other of the torque sensors based on a pattern of vibrations detected by the other torque sensor due to the continuous torque and determines that the other torque sensor is having failure if amplitude of vibrations is less than a reference amplitude.

A method for calibrating an output of a torsional vibration transducer can include: providing a torsional vibration transducer proximate to a body of a shaft configured to rotate along an axis of rotation, the torsional vibration transducer configured to measure a torsional vibration of the shaft; actuating the shaft to cause rotation of the shaft; while the shaft rotates, acquiring, using the torsional vibration transducer, a plurality of zero-stress measurements of the shaft across a plurality of gaps between the torsional vibration transducer and the shaft; calculating at least one calibration coefficient using the plurality of zero-stress measurements; and calibrating the output of the torsional vibration transducer according to the at least one calibration coefficient to reduce a sensitivity of the torsional vibration transducer to changes in gap between the torsional vibration transducer and the shaft when the torsional vibration of the shaft is measured.

There is a strap tension detector for detecting tension in a strap. A housing has an upper portion and a lower portion. The upper portion and lower portion are adapted to receive the strap. A strain beam is mounted to one of the upper portion and the lower portion. The strain beam is arranged at an angle to the strap to extend across the width of the strap when the strap is placed between the upper portion and the lower portion and extending through the first and second strap-receiving openings so that the strap bears on the strain beam when taut. A strain gauge is operatively connected to detect strain across the strain beam.

There is a strap tension detector for detecting tension in a strap. A housing has an upper portion and a lower portion. The upper portion and lower portion are adapted to receive the strap. A strain beam is mounted to one of the upper portion and the lower portion. The strain beam is arranged at an angle to the strap to extend across the width of the strap when the strap is placed between the upper portion and the lower portion and extending through the first and second strap-receiving openings so that the strap bears on the strain beam when taut. A strain gauge is operatively connected to detect strain across the strain beam.

A sensor calibration system includes a controller configured to receive a first electrical output generated by a sensor while submitted to a first input condition and a second electrical output generated by the sensor while submitted to a second input condition. The first and second electrical outputs represent lower and upper limits, respectively, of a sensor measurement range. The controller obtains a first reference value that corresponds to the lower limit and a second reference value that corresponds to the upper limit, and determines a drift function of the sensor based on a value of the first electrical output, a value of the second electrical output, the first reference value, and the second reference value. The controller inputs a value of a raw electrical output generated by the sensor into the drift function to determine an adjusted value of the raw electrical output.

A measurement circuit that is configured to provide a torque reading to a motion controller includes an offset controller and an amplifier. The offset controller is configured to read a temperature signal and to generate an offset voltage in response to receiving the temperature signal. The amplifier is configured to read a differential voltage from a differential sensor and to receive the offset voltage from the offset controller. The amplifier is also configured to add the offset voltage to the differential voltage after applying a gain to the differential voltage to generate an adjusted voltage. The amplifier is then configured to transmit the adjusted voltage.

Systems and methods for measuring torque on a drive train component of a rotating drive system are disclosed. In some aspects, a system includes a target assembly, a sensor assembly, and a sensor processing unit. The sensor assembly is located proximate to the target assembly, and the sensor assembly includes sensors mounted radially around the shaft and configured to detect sensor targets as the target assembly rotates with the drive train component. The sensor processing unit is configured for receiving sensor signals from the sensor assembly and outputting a torque signal based on the sensor signals. The sensor processing unit is configured for receiving target calibration data for the target assembly and sensor calibration data for the sensor assembly. The sensor processing unit is configured for verifying that the target calibration data corresponds to the target assembly and that the sensor calibration data corresponds to the sensor assembly.

An input-side control device includes a first input signal generation unit for generating a first input signal on the basis of the deviation between an engine torque command signal and an input-side shaft torque detection signal; a second input signal generation unit for generating a second input signal on the basis of an input-side speed detection signal weighted according to a prescribed weighting signal; and a torque command signal generation unit for generating a torque command signal on the basis of the first and second input signals. If the value of a filtered signal obtained from the input-side speed detection signal is less than a prescribed threshold, the second input signal generation unit makes the value of the weighting signal lower than if the value of the filtered signal were greater than or equal to the threshold.

A system for calibrating load sensors installed on an agricultural implement. The system includes a load sensor provided in operative association with a ground engaging tool and configured to capture load data indicative of a load applied to the ground-engaging tool. The system also includes a controller communicatively coupled to the load sensor configured to determine first and second load values based on the load data received from the load sensor when the down force actuator is disposed at first and second actuator positions so as to apply first and second down forces, respectively, against the ground engaging tool. The controller is also configured to determine a relationship between the first and second load values and corresponding force values associated with the first down force and the second down force.

A system for calibrating load sensors installed on an agricultural implement. The system includes a load sensor provided in operative association with a ground engaging tool and configured to capture load data indicative of a load applied to the ground-engaging tool. The system also includes a controller communicatively coupled to the load sensor configured to determine first and second load values based on the load data received from the load sensor when the down force actuator is disposed at first and second actuator positions so as to apply first and second down forces, respectively, against the ground engaging tool. The controller is also configured to determine a relationship between the first and second load values and corresponding force values associated with the first down force and the second down force.