Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Jtekt Corporation

Nissan Motor Company Limited

Yuji Takatsuka

Kazuhisa Nishino

Shunichi Wada

Shigeki Ohtagaki

Takayuki Kifuku

Isao Kezobo

Susumu Zeniya

Shun-Ichi Wada

Akira Furukawa

Tatsuya Mori

Yoshihiko Kimpara

Katsuhiko Ohmae

Yuya Tsuchimoto

Norihiro Yamaguchi

Yuuichi Fukuyama

Masashi Iwane

Hiroshi Nishimura

Takashi Iwasaki

Takanobu Takamatsu

Yasuaki Hori

Sadaaki Kamei

Mamoru Shiraki

Yasushi Takemoto

Ryouichi Suzuki

Kazuo Kikuta

Naoaki Oikawa

Takahiro Kuroiwa

Masayuki Tanaka

Seiichi Imaizumi

Keisuke Iwamoto

An electric power steering apparatus includes: a torque sensor configured to detect a steering torque of a driver; a motor configured to assist in a steering force of the driver; a rotation angle estimation unit configured to estimate a rotation angle of the motor to output an estimated angle; a correction signal calculation unit configured to calculate a correction signal based on the steering torque; a frequency separation unit configured to separate the estimated angle into a first frequency component and a second frequency component; an estimated angle correction unit configured to calculate, as a control angle, a value obtained by adding a second-frequency-component corrected signal, which is obtained by correcting the second frequency component based on the correction signal, to the first frequency component; and an electric power supply unit configured to supply electric power to the motor based on the control angle.

Electric power steering apparatus and electric power steering control method

An electric power steering apparatus including: a steering torque detector to detect a steering torque of a driver; a motor to assist a steering force of the driver; an estimated speed calculator to calculate an estimated speed, which is an estimated value of a rotation speed of the motor; an estimated speed corrector to correct the estimated speed based on the steering torque; an estimated angle calculator to calculate an estimated angle of the motor by integrating the estimated speed after the correction; and an electric power supply to supply electric power to the motor based on the estimated angle, wherein the estimated speed corrector corrects the estimated speed when a determination signal, which is based on a value obtained by removing a frequency component of steering of the driver from a derivative of the steering torque, the steering torque, and the estimated speed have the same signs.

Electric power steering apparatus and method for controlling electric power steering

A shortening of an initial diagnosis time is achieved, even after an elapse of a predetermined delay time from an ignition switch being switched to an off-state. After the ignition switch is switched to an off-state after an operation of a control device, which drives an electric motor that applies steering assistance force to a steering system, diagnosis of a power supply circuit that supplies power to the control device is carried out, and a diagnosis item to be implemented in a succeeding initial diagnosis is determined based on a result of the diagnosis.

Electric power steering device

An electric power steering control device, in which a control response capability in a low speed region can be improved, and a noise and a vibration can be suppressed, is provided. Although a control amount setter of the electric power steering control device performs a PI control computing in accordance with a deviation between a target current and an actual current, the control amount setter includes a gain setter which varies a gain of a proportion term in accordance with the deviation and a vehicle speed, and a control amount is computed in an integration term by using a predetermined constant gain.

Electric power steering control device

Provided is a control device for an electric power steering device, the control device configured to control an output torque of a motor that provides an assist torque to a steering torque, the output being controlled based on a steering-torque signal from a torque sensor that detects a steering torque, the control device controls the output torque using a correction signal to damp a vibration at a natural frequency determined in accordance with a transfer characteristic from the steering-torque signal to the output torque.

A control device for an AC rotating machine includes a voltage command calculation means () that calculates voltage commands on rotation two axes and a voltage applying means () that applies a voltage to an AC rotating machine (), based on voltage commands on the rotation two axes outputted by the voltage command calculation means (); the voltage command calculation means () calculates first-axis and second-axis voltage commands on the rotation two axes and reduces the limit value of the second-axis voltage command in proportion to the squared first-axis voltage command.

Control device for alternating current rotating machine and electric power steering device equipped with control device for alternating current rotating machine

A main control device generates a first signal and a second signal, which is substantially equivalent to the first signal, in accordance with the input signal, a sub-control device includes a comparison-judgment-processing unit that compares the first signal with the second signal, and judges that an abnormality occurs when a state, in which a deviation between the both signals is greater than equal to a predetermined value, is continued in a time being equal to a first predetermined time, and a limitation unit is configured in such a way that the limitation unit adds a predetermined limitation to the output of the main control device in accordance with a result for which the comparison-judgment-processing unit judges that the abnormality occurs.

Control system and electric power steering control device

An electric power steering apparatus is provided that has a controller by which no current flows in one phase among current paths of three phases for supplying electric power from a motor driving circuit to a three-phase brushless motor and currents that have an identical absolute value and that have different signs flow in the other two phases. Thus, the status at one energization angle on the driving current waveform of the three-phase brushless motor can be given continuously and relatively-high currents can simultaneously flow in opposite directions in the contacts inserted to the two phases. By flowing of such high current in the contacts, a secure conduction check can be performed and foreign matters on the surface of the contact can be fused or thermally destroyed.

Electric power steering apparatus

In an electric power steering apparatus including a capacitor for smoothing out the voltage of a battery and a relay including a relay contact disposed at a place upstream of the capacitor, a path is provided for directly conducting a terminal voltage of the capacitor from a downstream side of the relay contact to a system power supply that generates a source voltage for a control system including a controller and the like, so that the system power supply and the control system that is supplied therefrom with electric power for control purpose are utilized as a discharge circuit. Thus is obtained a simplified configuration of circuit responsible for discharging the capacitor.

An electric power steering control includes a torque sensor for detecting steering torque as torque information, a motor for generating assist torque, a calculation section for calculating a motor current command value based on the torque information at each predetermined sampling period, and a motor current control section for driving and controlling the motor based on the motor current command value. The calculation section includes a first target current calculation section for calculating a first target current based on the torque information detected in a time series manner at a first control period corresponding to the sampling period, and a second target current calculation section for calculating a second target current based on the first target current at a second control period shorter than the first control period. The motor current control section controls the motor by using the second target current as the motor current command value.

Electric power steering control apparatus

Conventionally, there was a problem that in cases when it is difficult to place a temperature sensor in the vicinity of a heat-generating portion, overheating could not be prevented. Disclosed is an electric power steering control system including a torque sensor for detecting steering force of a steering system; a motor current determination unit for determining the motor current based on the steering force detected by the torque sensor; a temperature sensor for detecting an ambient temperature; a coefficient setting unit for setting a coefficient in accordance with the detected temperature obtained by means of the temperature sensor; a motor current detection unit for detecting a motor current being passed to a motor; a maximum current limit value calculation unit for calculating a maximum current limit value based on the detected current and the coefficient; a current limiting unit for selecting the smaller value between the motor current determined by the motor current determination unit and the maximum current limit value calculated and outputting this as a target current; and a motor current control section for passing the target current to the motor in such a way that the motor current is equal to the detected current, whereby a motor current limit being set according to temperature is applied.

Electric power steering control system

Electric power steering system

An electric power steering control system in which the steering 'feel' is improved, having a steering force detector an electric motor for producing an auxiliary steering force, a motor current detector and a control unit for deciding the motor current value and rotational direction at least in accordance with the detected steering force. The motor current is limited in accordance with the detected steering force and motor current values.

Growing community of inventors

Hyogo, Japan

Yuji Takatsuka