Aisin Seiki Kabushiki Kaisha

Aisin Seiki Kabushiki Kabushiki

Hiroyuki Inagaki

Hiroaki Kato

Yoshihide Suzuki

Hideki Kuzuya

Noboru Sebe

Masanori Sugiyama

Kenji Ikeda

Daisuke Yamada

Chiaki Honma

Noriko Matsuo

A power transmission apparatus disposed includes: a motor for driving wheels, and transforms kinetic energy at the driving path to electrical energy; a normal close type clutch that includes an input and an output and is selectively set in an engaging state and a released state, wherein the clutch is normally set in the engaging state by a biasing member and is set in the released state when hydraulic pressure is applied; a hydraulic-pressure feeding device for supplying the adjusted hydraulic pressure to the clutch; and a control device for controlling the feeding device. When changing the clutch from the engaged state to the released state, if the difference between rotation numbers of the input and the output becomes equal to or larger than the predetermined value, the control device controls the feeding device to bring the clutch to a state just before the engaged state.

Power transmission apparatus and power transmission control apparatus

A control apparatus for an AC motor controls an inverter in a pulse width modulation scheme to feed a coil current to a stator coil of a stator. A pattern switching mechanism switches a control pattern to a first pattern or to a second pattern; a first pattern calculating mechanism calculates a control signal using a first pattern parameter; a second pattern calculating mechanism calculates a control signal using a second pattern parameter; an offset calculating mechanism calculates a difference between a control signal of an old pattern and a control signal of a new pattern, and reflects the offset amount on the control signals; and a control output mechanism calculates a final control output signal on the basis of the control signals, and transmits the final control output signal to the inverter.

Control apparatus and control method for AC motor

An electric motor such as a driving source of an electric vehicle is controlled by the microcomputer. The microcomputercalculates a target torque Req_trq according to a throttle opening degree &#x3b1;, and outputting induction values (a current instruction value I and a angle instruction value &#x3b8;) obtained referring to a map MP based on the target torque Req_trq (a motor rotational number Nm and a battery voltage Vb), the microcomputerperforms a torque control of an SR motor. The motor rotational number Nm detected from the SR motoris passed through a band pass filter. Passing by the band pass filter, a signal data of the extracted 0.1-50 Hz is executed a PD calculation process, the calculated corrected amount PD_out is subtracted from the target torque Req_trq.

Digital signal to pulse converter and method of digital signal to pulse conversion

A control device of an electric motor which can compatible high robust stability performance and a tracking performance and a designing method thereof. A feedback correction is obtained based on a detected motor rotation speed and a feedforward correction amount is obtained based on a calculated target torque by a controller of a microcomputer. The microcomputer commands torque control to an SR motor based on the feedback correction amount and the feedforward correction amount.

Control device for electric-powered motor and designing method thereof

A controller K calculates a command torque by correcting the required torque w with a correction based on a motor rotation speed Nm, and controls an electric motor based on the command torque T. The command torque w is regarded as one content of an outside input W to the controller K. A difference between the rotation speed of the electric motor outputted by the actual model describing an actual response of the electric motor and another rotation speed of the electric motor outputted by a reference model describing ideal performance and vibration reduction is regarded as one content Z of controlled output Z from the controller K. Moreover, a characteristic variation depending on vehicle types and so on, a torque ripple, and a sensor noise are described by weight functions wm , wm and wn. Then a pertubative output w and a sensor noise w are regarded as the remaining contents of the input W. An output of the weight function wm is regarded as the controlled output Z. The controller K is determined by solving H&infin;control problem that a transfer function between the outside input W and the controlled output Z is determined as an H&infin;norm of the transfer function to be smaller than a predetermined value.

Electric motor control device

In order to make an electric motor smooth in drive with improving the electric consumption efficiency, the over heat of a motor driver and vibrations thereat are restricted which result from chopping energization of the electric motor.

Chopping energization control device

A motor driving control device that achieves as high as possible phase coil energization level while preventing thermal destruction of the power switching element by using precise thermal detection of a portion of the power switching element inside a switching module of the control device. An electric power loss Lt at the switching element is used for calculating a saturation temperature Tjgoal. On the basis of the saturation temperature, Tjgoal, and a time constant &tgr; of temperature rise, an instant junction temperature Tjnow is calculated. A difference Error between the instant junction temperature Tjnow and an upper temperature limit value Tjmax is calculated. In a motor locked condition, a coefficient Kt is calculated for the target torque, the target torque being equal to the required torque multiplied by Kt. Kt is based on the Error for calculating the target torque. If Error is greater than or equal to a predetermined value, K3, Kt is set to be 1, even if Kt is in excess of 1. If Error is less than or equal to 0 , Kt is set to be zero.

Growing community of inventors

Aichi-ken, Japan

Hiroyuki Inagaki