Patent application number | Description | Published |
20140158453 | ROTATION ANGLE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM INCLUDING THE SAME - Sinusoidal signals (S | 06-12-2014 |
20140158455 | ROTATION ANGLE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM INCLUDING THE SAME - Rotation angle computation modes include a normal mode and a simple mode. In normal mode, a rotation angle of an input shaft is computed based on output signals from first and second magnetic sensors, which are sampled at two sampling timings. In simple mode, the rotation angle of the input shaft is computed based on the output signals from the first and second magnetic sensors, which are sampled at one sampling timing, and an amplitude ratio between the output signals from the magnetic sensors set in advance. After a power supply is turned on, the rotation angle is computed in the simple mode until a condition that the rotation angle of the input shaft can be computed in the normal mode even if the immediately preceding value of the rotation angle of the input shaft is not present is satisfied. Then, the rotation angle is computed in the normal mode. | 06-12-2014 |
20140163921 | ROTATION ANGLE DETECTION DEVICE - In a rotation angle detection device, each of an angular interval between a first magnetic sensor and a second magnetic sensor and an angular interval between the second magnetic sensor and a third magnetic sensor is 60° in electrical angle. When two magnetic sensors including the second magnetic sensor among the three magnetic sensors are operating properly, if the two properly operating magnetic sensors including the second magnetic sensor sense one and the same magnetic pole for a prescribed number of multiple consecutive sampling periods, the rotation angle is computed based on the output signals from the two magnetic sensors. When only the second magnetic sensor malfunctions, if the first and the third magnetic sensors sense one and the same magnetic pole for the prescribed number of multiple consecutive sampling periods, the rotation angle is computed based on the output signals from the two properly operating magnetic sensors. | 06-12-2014 |
20140163922 | ROTATION ANGLE DETECTION DEVICE - In a rotation angle detection device, when a condition that two sensors among three magnetic sensors sense one and the same magnetic pole for three consecutive sampling periods is satisfied, a rotation angle is computed based on output signals from the two sensors, sampled at three sampling timings. When the output signals sampled at the three sampling timings satisfy a prescribed requirement, an angular width error correction value corresponding to the magnetic pole sensed by the two sensors and amplitudes are computed, and stored in association with the magnetic pole. If the condition is not satisfied, the rotation angle is computed based on the information stored in a memory and the output signals from two sensors among the three magnetic sensors, the two magnetic sensors including one of the three magnetic sensors, which detects the magnetic pole of which the angular width error correction value is stored in the memory. | 06-12-2014 |
20140163923 | PHASE DIFFERENCE DETECTOR AND ROTATION ANGLE DETECTION DEVICE INCLUDING THE SAME - In a phase difference detector, a first phase difference computation unit computes a value of E(i)·C corresponding to one and the same given magnetic pole sensed by the two magnetic sensors with use of six output signals sampled at three different timings while the two magnetic sensors are sensing the given magnetic pole when a rotary body is rotating. E is an angular width error correction value, and C is a phase difference between two signals. The first phase difference computation unit executes this process until values of E(i)·C corresponding to all the magnetic poles are computed. After that, the first phase difference computation unit computes the phase difference between the output signals with use of the values of E(i)·C corresponding to all the magnetic poles and the number (m) of the magnetic poles. | 06-12-2014 |
20140365077 | ELECTRIC POWER STEERING SYSTEM - In an electric power steering system, a low-pass filter executes a low-pass filtering process on a detected steering torque value detected by a torque sensor. A steering torque deviation computing unit computes a deviation ΔT between a detected steering torque value T* obtained through the low-pass filtering process and the detected steering torque value detected by the torque sensor. A PI control unit generates a vibration compensation value used to lead the detected steering torque value to the steering torque value obtained through the low-pass filtering process, by executing PI computation on the steering torque deviation computed by the steering torque deviation computing unit. | 12-11-2014 |
20150077093 | ROTATION ANGLE DETECTING DEVICE - In a rotation angle detecting device, a first magnetic sensor and a second magnetic sensor are disposed at an interval of an electrical angle of 120 degrees around a rotation center axis of a rotor. An output signal of the first magnetic sensor is expressed by V | 03-19-2015 |
20150109114 | WARNING DEVICE FOR VEHICLE - In a warning device for a vehicle, a basic target current value setting unit sets a basic target current value based on a steering torque and a vehicle speed. When a lane deviation determining unit determines that there is a high possibility that a vehicle will deviate from a lane, a warning vibration wave generator generates a warning vibration wave containing a plurality of frequency components. A target current value is computed by adding the warning vibration wave to the basic target current value. A motor current to be applied to an electric motor is controlled so as to approach the target current value. | 04-23-2015 |