Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Masaki Matsushita

Takayuki Kifuku

Hiroyuki Kozuki

Takayuki Yamamoto

Katsuya Ikemoto

Shunichi Wada

Ryoichi Yonezawa

Masahiko Kurishige

Masaya Endo

Masahiro Kimata

Hideki Doi

Isao Kezobo

Seiji Sawada

Akihiko Mori

Yoshihiko Kimpara

Chiaki Fujimoto

Yu Kawano

Katsuhiko Ohmae

Jiro Okada

Yasuaki Hori

A malfunction detection device for a resolver detects malfunction in a resolver with accuracy and stability even if a value of a square sum is varied between inside and outside of a normal range. When the resolver is in malfunction, a sine signal and a cosine signal are read. It is determined whether a malfunction determination of the resolver is prohibited, or not, from read values of the sine signal and the cosine signal, or square values thereof. When it is determined that the malfunction determination of the resolver is prohibited, the count value is accumulated and incremented every time the test value falls outside a normal range. When the count value arrives at a given value or higher, it is determined that the resolver is in malfunction.

Malfunction detection device for resolver

A vehicle steering control apparatus includes a power-supply supply portionsupplying a power supply to a micro-controller, an invertersupplying power to drive a motor, a gate drivercontrolling the inverter, a motor relayopening and closing a current-passing path between the inverterand the motor, a motor relay drivercontrolling the motor relay, and a monitoring control portion Aand a monitoring control portion Bmonitoring a power-supply voltage of the power-supply supply portion. Because multiple monitoring control portions are included, even in the event of an inconvenience in either one of the monitoring control portions Aand B, the motorcan be stopped quickly in a reliable manner when the power-supply voltage goes out of a normal operation range.

Vehicle power steering control apparatus

The apparatus herein provided includes a plurality of systems including driving circuits () for driving motor coils () corresponding thereto, and a control unit () for controlling control values of the driving circuits (), wherein, when a fault occurs in at least one of the plurality of systems including the motor coils (), the control unit () decreases a control value of a system(s) in which the fault occurs from an ordinary time control value or stops the drive by the system(s) in which the fault occurs, and also increases a control value of another system(s) in which the fault does not occur to more than an ordinary time control value.

Electric power steering apparatus

In a steering control device, a road surface reaction force torque calculation module () uses a vehicle speed, steering angle, and vehicle model to calculate a caster-trail-caused torque, a self-aligning torque, and a road surface reaction force torque. A reaction force command current calculation module () uses the road surface reaction force torque and the vehicle speed to calculate a reaction force command current.

Power steering controller with compensation for tire deformation and caster

A steering control apparatus is obtained which can achieve a sophisticated control function and redundancy of a motor output torque control unit with a simple construction. The apparatus includes a motorthat provides assist torque to a steering system, and a processing unitthat has an input processing sectionfor taking in detection signals of various kinds of sensors, and an inverterfor driving the motor, wherein a command is given to the inverterbased on the detection signals. The processing unithas a motor target output torque calculation section, a motor output torque control unit, a plurality of main-calculation sections, and a plurality of sub-calculation sections corresponding to the main-calculation sections, and determines abnormality of the motor output torque control unitbased on individual calculation results of the main-calculation sections and the sub-calculation sections.

Steering control apparatus

In an electric motor control apparatus, an electric motor driving unit includes: a current detection unit configured to detect a current flowing through a current detection place in the electric motor driving unit. A control unit includes a current calculation unit configured to calculate a current value of a current flowing through an electric motor from an offset correction value obtained based on a first detection value detected at a time when a current flows through the current detection place and a second detection value detected at a time when a current does not flow through the current detection place. The offset correction value includes: a first offset correction value stored in nonvolatile memory of the control unit at a time of assembling the electric motor control apparatus; and a second offset correction value computed by the control unit while the electric motor is driven.

Electric motor control apparatus

A motor-driven power steering control apparatus is achieved, which uses a small-amplitude pass filter, the filter filtering out a component having a small amplitude, to remove a steering component from dynamic state quantity such as a rotational speed signal, and to accurately extract only a vibration component having a small amplitude compared with the steering component, and controls the vibration component to be reduced.

Motor driven power steering control apparatus for suppressing vibration

A steering control system is connectable to a motor configured to control a steering and a LAN (Local Area Network) and is allowed to receive a control signal for controlling said motor from the LAN is received. The steering control system includes: a motor configured to control a steering; a main calculation unit connectable to the LAN; a motor drive circuit connected to the main calculation unit and configured to drive the motor; a sub calculation unit connectable to the LAN; and a motor drive limiting unit connected to the sub calculation unit and configured to limit a drive of the motor.

Steering control system

An electric power steering control apparatus can limit a motor impression voltage thereby to maintain an appropriate motor output even upon occurrence of a failure of a motor current detection circuit or a motor current feedback control system. The apparatus includes a motor that generates an assist force to the steering system, an input processing section that takes in a steering torque signal from a torque sensor, an output processing section that drives the motor, and a processing unit that provides an instruction to the output processing section based on the steering torque signal. The processing unit includes an impression voltage calculation section that calculates an amount of operation to the motor in accordance with the steering torque signal, and an impression voltage limiting section that limits the impression voltage to predetermined limit values or less corresponding to the direction of the steering torque signal.

Electric power steering control apparatus

A motor control apparatus can protect circuit elements in an appropriate manner while preventing an incorrect abnormality determination when a motor is in regeneration operation, etc. The apparatus includes a target current calculation section (), a drive control section () that generates a drive signal based on a current deviation &#x394;I between a target current (IMT) and a detected current (IMS), an abnormality determination section () that generates an abnormality determination signal based on the target current (IMT) and the detected current (IMS), and a regeneration operation determination section () that determines whether the motor () is in a regeneration operation state. When it is determined that the motor () is in a regeneration operation, a determination threshold of the abnormality determination section () is set to a value larger than a determination threshold during power running operation.

Motor control apparatus

An objective is to detect a resolver malfunction without fail, using a low-cost resolver having the small number of the poles, and a control-motor system having advantage in small sizing and high-power outputting. In the control-motor system, the system for driving a 2m-pole motor based on a rotor rotation angle &#x3b8; detected by a 2n-pole resolver, where m and n being counting numbers, is characterized in that: the sum of the square of a signal modulated by sin &#x3b8; and the square of a signal modulated by cos &#x3b8; in the resolver in which an excitation signal generated in said system is modulated by sin &#x3b8; and cos &#x3b8; in response to the rotor rotation angle &#x3b8; of the resolver is compared to a predetermined malfunction threshold value, so that malfunction determination related to the resolver is performed, and also, given that the sum is awhen the resolver is recognized to be in normal operation, the malfunction determination threshold value is made to be not smaller than {a&#xd7;cos((&#x3c0;/2)/(m/n))}.

Control-motor system

An inverter fault detection system of the present invention is provided with: bus voltage monitor means for monitoring the bus voltage of a three-phase inverter; output voltage monitor means for summing the phase output voltages coming from the three-phase PWM inverter, and for outputting the resulting summed output voltage through a filter having a low-pass characteristic of passing through only the cutoff frequency lower than the PWM carrier frequency; and fault determination means for determining that the three-phase PWM inverter is in the faulty state when the output voltage coming from the output voltage monitor means is almost the same as the voltage value corresponding to 3/2 times of the bus voltage monitored by the bus voltage monitor means.

Fault detection system for inverter

An objective is to provide a specific realization means for easily determining malfunction of a system in an electromotive power steering controller. The electromotive power steering controller includes: a voltage controller for controlling voltage applying to a motor based on a d-axis current command value and a q-axis current command value that are set by a d-q-command-value setting unit, and a d-axis current detection value and a q-axis current detection value that are obtained by, using the d-q coordinate system, transforming three-phase ac current that has been actually flowing in the motor and has been detected by a current detector; and a malfunction determining unit for determining that malfunction has occurred in the control system if at least one of the phase-current detection value is out of a first predetermined permissible range.

Growing community of inventors

Tokyo, Japan

Masaki Matsushita