Patent application number | Description | Published |
20100243367 | POWER STEERING APPARATUS - A power steering apparatus includes a worm wheel mounted on the steering shaft, a worm shaft engaged with the worm wheel, a gear housing having a wheel accommodating portion to accommodate the worm wheel and a shaft accommodating portion to accommodate the worm shaft, a bearing mounted on the worm shaft to rotatably support the worm shaft, a holder disposed in the shaft accommodating portion and having a bearing retaining portion to retain the bearing and a resilient element disposed in the shaft accommodating portion and having a resilient body portion formed with a curvature. The resilient body portion is so structured as to become deformed in such a manner as to increase or decrease in diameter when the bearing shifts in a direction that moves the worm shaft away from the worm wheel and bias the bearing in a direction that urges the worm wheel toward the worm wheel. | 09-30-2010 |
20130233639 | ELECTRIC POWER STEERING SYSTEM AND CONTROLLER OF THE ELECTRIC POWER STEERING SYSTEM - Electric power steering system has steering mechanism; input and output shaft side rotation angle sensors detecting rotation angles of input and output shafts; operation circuit calculating command current for an electric motor; rotation direction judging circuit judging whether rotation directions of the input and output shafts are identical; advanced-phase judging circuit judging which phase of input and output shaft side rotation angle signals (S | 09-12-2013 |
20130289826 | Power Steering Apparatus, and Controller for Power Steering Apparatus - In a power steering system, a torque sensor obtains first and second rotation angles, and a steering angle sensor obtains third and fourth rotation angles. A controller includes a first absolute rotation angle calculation section, a second absolute rotation angle calculation section, and an abnormality detection section. The first absolute rotation angle calculation section calculates a first absolute rotation angle as a first estimate of an absolute rotation angle of a steering wheel based on the first and third rotation angles. The second absolute rotation angle calculation section calculates a second absolute rotation angle as a second estimate of the absolute rotation angle of the steering wheel based on the third and fourth rotation angles. The abnormality detection section detects an abnormality by comparison between the first absolute rotation angle and the second absolute rotation angle. | 10-31-2013 |
20130289827 | Power Steering System And Control Apparatus For Power Steering System - In a power steering system and a control apparatus for the power steering system, an abnormality detection process section ( | 10-31-2013 |
20130314013 | Motor Driving Control Apparatus - In related art technique, an average neutral point voltage is detected via a low-pass filter. Time constant of the low-pass filter must be set to cover the entire output frequency band of an inverter and voltage fluctuation due to modulated signal must be separated from that due to a short circuit to ground. According to the present invention, whether abnormality such as a short circuit to ground or to supply occurs in output lines can be determined based on an actual neutral point voltage of a motor, which changes in a stepwise fashion in conformity to a PWM pulse pattern output by an inverter device, and a normal neutral point voltage which depends on a PWM pattern output by the inverter device. Highly reliable abnormality detection in accordance with the waveform of the neutral point voltage and stable abnormality detection not depending on the inverter output frequency are feasible. | 11-28-2013 |
20140074357 | Power Steering System - In a power steering system, at least one of phase open relays in which a contact weld (an abnormality) occurs is detected. That is to say, the power steering system comprises an abnormality monitor section ( | 03-13-2014 |
20140077733 | Electrically Driven Power Steering System And Control Apparatus For The Same - In an electrically driven power steering system and a control apparatus for the electrically driven power steering system which are capable of reducing a development of a noisy sound due to a magneto-strictive sound. A voltage V(Thys) corresponding to each of PWM pulses achieving time Thys (a third predetermined value) corresponding to a hysteresis is added to one of the voltage command values of a voltage large phase from among three phase first voltage command values (Vu1*, Vv1*, Vw1*) and this voltage V(Thys) is subtracted from one of the remaining voltage command values which is a voltage small phase to derive virtual voltage command values, and the virtual voltage command values (Vu*im, Vv*im, Vw*im) are mutually compared to carry out a voltage magnitude (large, middle, small) phase determination. | 03-20-2014 |
20140088831 | Electrically Driven Power Steering System - In an electrically driven power steering system having a blushless three phase motor, an abnormality of a control unit is detected on a basis of a direct current bus bar current of an inverter detected by a current sensor and an estimated primary current. The estimated primary current is calculated from, for example, the following equation, namely, Iu×Du+Iv×Dv+Iw×Dw)/100%, wherein Iu denotes a current of a U phase of the motor, Du denotes a PWM duty signal of the U phase, Iv denotes a current of a V phase of the motor, Dv denotes the PWM duty signal of the V phase of the motor, Iw denotes a current of a W phase of the motor, and Dw denotes the PWM duty signal of the W phase. | 03-27-2014 |