Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Eiji Iwami

Susumu Zeniya

Daisuke Tanaka

Takashi Goto

Hiroyuki Kishioka

Takayuki Kifuku

Akira Furukawa

Isao Kezobo

Akihiko Mori

Yoshihiko Kimpara

Masahiro Iezawa

Munenori Yamamoto

Katsuya Ikemoto

Kenta Kawahara

Jiro Okada

Hideki Doi

Yasuaki Hori

Sadaaki Kamei

Akiyoshi Takashima

Yusuke Fujiki

Provided is an electric power steering device including a phase compensation unit having a desirable phase compensation characteristic for each vehicle speed region, which suppresses deterioration in stability of a steering system in a case where the phase compensation characteristic is changed to a different phase compensation characteristic, in which the phase compensation unit includes: a plurality of phase compensation calculation units configured to execute phase compensation calculation based on each phase compensation characteristic; a phase compensation characteristic determination unit configured to determine a phase compensation characteristic based on a vehicle speed signal output from a vehicle speed sensor; and a selection unit configured to select a phase-compensated torque signal output by the phase compensation unit from phase compensation calculation results output by the plurality of phase compensation calculation units in consideration of an amount of change in phase compensation calculation result at a time of switching the phase compensation characteristic.

Electric power steering device and control method therefor

An abnormality determination means performs detection of abnormality of one of the pairs of detection means at a normal speed, and performs detection of abnormality of the other of the pairs at a speed not higher than the normal speed, and, when a sign of abnormality of the detection means is detected at the normal speed, a CPU performs switching to the other normal pair and continues control, and the abnormality determination means performs detection of abnormality of the other normal pair at the normal speed, and meanwhile, continues to perform detection of abnormality of the abnormal pair at a speed not higher than the normal speed.

Electronic control device and operation control method therefor

In an electric power steering device including a controller, which is configured to carry out feedback control for a motor including independent two coil winding groups and being configured to rotate a steering mechanism of a vehicle, when one of the two groups recovers from a failure that has occurred in the one group while control is continued solely by another group due to the failure, the controller resumes cooperative control by the two groups, and when starting the cooperative control, sets target current values of the one group and the another group to values different from a final target current value based on an actual current value or a target current value of the another group at a time of the recovery, to thereby output respective control amounts for the cooperative control.

Electric power steering device and control method of electric power steering device

A main controller includes: a d-axis current limiter configured to calculate a d-axis current limiting value with priority, based on a dq-converted current limiting value, and calculate a limited d-axis current command value by clipping the d-axis current command value to be the d-axis current limiting value or less; a q-axis current limiter configured to calculate a q-axis current limiting value, based on the dq-converted current limiting value and the limited d-axis current command value, and calculate a limited q-axis current command value by clipping the q-axis current command value to be the q-axis current limiting value or less; and an inverter controller configured to control motor current, based on the limited d-axis current command value and the limited q-axis current command value.

Electric power steering control apparatus and electric power steering control method

Provided are a motor control device () for controlling a motor () having a plurality of phases, for quickly and accurately detecting a phase in which an open-state fault has occurred when the open-state fault occurs in a target phase. When a power-supply voltage (Vb) is equal to or higher than a predetermined voltage (Vthr), a motor rotation speed (&#x3c9;) is equal to or lower than a predetermined speed (&#x3c9;thr), a target x-phase voltage command (Vx*) is not in the vicinity of zero, a current (Ix) of the target x-phase is equal to or lower than a predetermined current (Iu_thr), and a state in which a control error is equal to or larger than a predetermined error is detected over a predetermined time period or longer, occurrence of an open-state fault in the target phase is determined.

Motor control device and electric power steering device using same

Provided is an electric power steering control device which can realize a more appropriate countermeasure against heat in accordance with a thermal characteristic of a component used to supply a motor current. The electric power steering control device for assisting a steering force of a steering wheel of a vehicle including a control unit (). The control unit () prestores a first overheat-protection characteristic corresponding to self-heating and a second overheat-protection characteristic corresponding to an ambient temperature for each component (to) mounted in the control unit as an overheat-protection characteristic specifying a correspondence relationship between a heat-source current value of the each component and an overheat-protection coefficient, and sequentially corrects a current upper-limit value obtained for the each component by using overheat-protection coefficients of both characteristics to continue current control in accordance with a smallest current upper-limit value of results of the correction.

Electric power steering control device and electric power steering control method

In an electric power steering apparatus in which a third motor target current is determined from a first motor target current determined on the basis of a detection torque from a steering torque detection means and a second motor target current determined using at least a detection value of the motor current detection circuit as one of inputs, and a motor drive signal is calculated on the basis of the third motor target current and a detection current from the motor current detection circuit to control a motor current, there is included a motor current detection circuit failure judgment means for judging a failure of the motor current detection circuit, and when a judgment of failure is made, at least the second motor target current is limited.

Electric power steering apparatus and control method of the same

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Tokyo, Japan

Eiji Iwami