Abstract: A vehicle control device includes: an idle-stop controller configured to control an idle-stop function of a vehicle; and an electric power steering controller configured to assist a steering operation with an electric motor. The electric power steering controller is configured such that, when the electric power steering controller detects a failure by diagnosis, the electric power steering controller controls, based on whether vehicle speed related information including vehicle wheel speed information is receivable and based on whether idle-stop related information related to an idle-stop operation is receivable, an assist operation assisting a steering effort while the idle-stop operation is in progress so that the idle-stop operation may be performed. The idle-stop controller is configured to control the idle-stop function of the vehicle even when the electric power steering controller detects the failure by the diagnosis.

Abstract: Provided is an electric power steering device including: a motor; a drive device that supplies the motor with three-phase alternating current electric power; and a control device that controls the drive device, in which the control device is connected to a first power supply path that supplies power to the control device not via an ignition switch and a second power supply path that supplies power to the control device via the ignition switch, and the control device, in a case of detecting a failing of the first power supply path, operates with power supplied from the second power supply path and makes the motor generate an electromagnetic brake.

Abstract: An electric power steering device includes a steering angle reference yaw rate calculation section that calculates a steering angle reference yaw rate by using a speed of a vehicle and a steering angle of a steering wheel, a torque estimation device that estimates a self-aligning torque (SAT) generated in a turning wheel of the vehicle on the basis of a measured yaw rate or the steering angle reference yaw rate, the absolute value of which is smaller, and the speed of the vehicle, and estimates a required assist torque on the basis of the estimated SAT, and an abnormality determination section that determines whether or not a steering torque sensor is abnormal. If the steering torque sensor is abnormal, an EPS control device controls drive of an assist motor using the required assist torque estimated by the torque estimation device, in place of a steering torque.

Abstract: An electric power steering device includes a steering angle reference yaw rate calculation section that calculates a steering angle reference yaw rate by using a speed of a vehicle and a steering angle of a steering wheel, a torque estimation device that estimates a self-aligning torque (SAT) generated in a turning wheel of the vehicle on the basis of a measured yaw rate or the steering angle reference yaw rate, the absolute value of which is smaller, and the speed of the vehicle, and estimates a required assist torque on the basis of the estimated SAT, and an abnormality determination section that determines whether or not a steering torque sensor is abnormal. If the steering torque sensor is abnormal, an EPS control device controls drive of an assist motor using the required assist torque estimated by the torque estimation device, in place of a steering torque.

Abstract: An electric power steering device provides an appropriate power assist from the motor even when torque sensors have failed and the steering torque is no longer detected. If an error is detected in a torque sensor, the motor is driven based on the rotor rotation angle detected by a resolver and assist characteristics. When the absolute value of the rotor turning angle velocity calculated based on the rotor rotation angle falls to or below a prescribed value, a process is started for reducing the current driving the motor, and if the state in which the absolute value of the rotor turning angle velocity has fallen to or below the prescribed value continues over a prescribed length of time, the process for reducing the current is interrupted and, because an assist current was flowing at said time of interruption, an appropriate power assist can be given during a steering retention period.

Abstract: Disclosed is an idle stop control device capable of relieving reaction force (kickback) of a handle occurring at idle stop controlled by the control of the idle stop control device. Specifically, an EPSECU (20) detects the rotational speed of an electric motor by detecting the rotational angle (?m) of the electric motor using a resolver (22), and at the same time, detects the steering torque using a torque sensor (23). Subsequently, the EPSECU determines whether or not the rotational speed of the electric motor and the steering torque are inside an idle stop transition area (P) by referring to a table (28) stored in a memory (27) in advance. When either or both of the rotational speed of the electric motor and the steering torque are outside the idle stop transition area (P), a signal requesting the prohibition of idle stop transition is output to an idle stop control device (10) via a cable (15).

Abstract: Disclosed is an electric power steering device capable of applying a prescribed steering assist force to a steering assembly, even when a torque sensor is out of order and the electric power steering device is in a state of being unable to sense steering torque by the torque sensor. Using an angle of rotation of a rotating element, which is detected by a resolver that serves as a rotating element angle of rotation sensing unit of a motor, a steering angle and a steering angular velocity are estimated, and a prescribed steering assist force is applied to a steering assembly by the motor, on the basis of an estimated steering angle and/or an estimated steering angular velocity.

Abstract: An electric power steering apparatus detects, as an abnormal phase, a phase other than a combination of phases whose interphase voltage is of nearly zero volts if a q-axis current is equal to or smaller than a first threshold value though a q-axis voltage is being applied. Alternatively, the electric power steering apparatus calculates a base electric angle at which the q-axis current is equal to or smaller than a third threshold value though the q-axis voltage is being applied, and determines an abnormal phase based on the base electric angle.

Abstract: An electric power steering device provides an appropriate power assist from the motor even when torque sensors have failed and the steering torque is no longer detected. If an error is detected in a torque sensor, the motor is driven based on the rotor rotation angle detected by a resolver and assist characteristics. When the absolute value of the rotor turning angle velocity calculated based on the rotor rotation angle falls to or below a prescribed value, a process is started for reducing the current driving the motor, and if the state in which the absolute value of the rotor turning angle velocity has fallen to or below the prescribed value continues over a prescribed length of time, the process for reducing the current is interrupted and, because an assist current was flowing at said time of interruption, an appropriate power assist can be given during a steering retention period.

Abstract: An electric motor is driven with high output at the time of low-speed running, and a steering at a high resolution is enabled at the time of fast-speed running. An electric power steering device causes the electric motor to generate auxiliary torque in accordance with the largeness of steering wheel torque by the steering operation of a wheel made by a driver and reduces the steering wheel torque to the driver. A control device drives, based on a vehicle-speed signal (Vs) from a speed sensor, the electric motor with high output at the time of low-speed running, and enables steering at a high resolution at the time of fast-speed running without increasing an electric-motor output.

Abstract: Disclosed is an electric power steering device capable of applying a prescribed steering assist force to a steering assembly, even when a torque sensor is out of order and the electric power steering device is in a state of being unable to sense steering torque by the torque sensor. Using an angle of rotation of a rotating element, which is detected by a resolver that serves as a rotating element angle of rotation sensing unit of a motor, a steering angle and a steering angular velocity are estimated, and a prescribed steering assist force is applied to a steering assembly by the motor, on the basis of an estimated steering angle and/or an estimated steering angular velocity.

Abstract: Disclosed is an idle stop control device capable of relieving reaction force (kickback) of a handle occurring at idle stop controlled by the control of the idle stop control device. Specifically, an EPSECU (20) detects the rotational speed of an electric motor by detecting the rotational angle (?m) of the electric motor using a resolver (22), and at the same time, detects the steering torque using a torque sensor (23). Subsequently, the EPSECU determines whether or not the rotational speed of the electric motor and the steering torque are inside an idle stop transition area (P) by referring to a table (28) stored in a memory (27) in advance. When either or both of the rotational speed of the electric motor and the steering torque are outside the idle stop transition area (P), a signal requesting the prohibition of idle stop transition is output to an idle stop control device (10) via a cable (15).

Abstract: An electric power steering apparatus detects, as an abnormal phase, a phase other than a combination of phases whose interphase voltage is of nearly zero volts if a q-axis current is equal to or smaller than a first threshold value though a q-axis voltage is being applied. Alternatively, the electric power steering apparatus calculates a base electric angle at which the q-axis current is equal to or smaller than a third threshold value though the q-axis voltage is being applied, and determines an abnormal phase based on the base electric angle.

Abstract: An electric motor (7) is driven with high output at the time of low-speed running, and a steering at a high resolution is enabled at the time of fast-speed running. An electric power steering device (1) causes the electric motor (7) to generate auxiliary torque in accordance with the largeness of steering wheel torque by the steering operation of a wheel (9) made by a driver and reduces the steering wheel torque to the driver. A control device (10) drives, based on a vehicle-speed signal (Vs) from a speed sensor (11), the electric motor (7) with high output at the time of low-speed running, and enables steering at a high resolution at the time of fast-speed running without increasing an electric-motor output. Moreover, large steering wheel torque is requisite at the time of low-speed running, and a steering at a high resolution is requisite at the time of fast-speed running. Accordingly, this does not affect the steering feeling to the driver.

Abstract: A control apparatus for an electric power steering system is provided, which controls a motor for applying assist steering torque to a steering line of a vehicle at least according to steering torque signal of the steering line, vehicle velocity signal and motor current signal. The control apparatus includes a target current controller for setting target current signal for driving the motor, a deviation calculator for computing a deviation between the target current and motor current signals, a deviation adjuster for adjusting the deviation with a variable gain according to the vehicle velocity signal, a proportional element for executing proportional control for the motor, an integral element for executing integral control for the motor and an gain adjuster for adjusting the gain according to a differential of the steering torque signal.

Abstract: An electric power steering control device includes a memory. The memory is accommodated in the electric power steering control device mounted on a vehicle, and permits rewrite and storage of data. Transmitting a signal from an external of the vehicle allows the data stored in the memory to be rewritten.

Abstract: An electric power steering apparatus is provided, which includes a steering torque sensor for detecting steering torque exerted on a steering system, a motor for exerting assist steering torque on the steering system, a motor current sensor for detecting drive current of the motor, a target current setting section for determining target current to be supplied for the motor based on the steering torque, a feedback control section for executing feedback control based on a deviation between the target current and the drive current of motor and a feedforward control section for executing feedforward control based on the target current. The apparatus has a feature that gain of the feedforward control is adapted to be greater as the speed of a vehicle increases.

Abstract: A control apparatus for an electric power steering system is provided, which controls a motor for applying assist steering torque to a steering line of a vehicle at least according to steering torque signal of the steering line, vehicle velocity signal and motor current signal. The control apparatus includes a target current controller for setting target current signal for driving the motor, a deviation calculator for computing a deviation between the target current and motor current signals, a deviation adjuster for adjusting the deviation with a variable gain according to the vehicle velocity signal, a proportional element for executing proportional control for the motor, an integral element for executing integral control for the motor and an gain adjuster for adjusting the gain according to a differential of the steering torque signal.

Abstract: An electric power steering apparatus is provided, which includes a steering torque sensor for detecting steering torque exerted on a steering system, a motor for exerting assist steering torque on the steering system, a motor current sensor for detecting drive current of the motor, a target current setting section for determining target current to be supplied for the motor based on the steering torque, a feedback control section for executing feedback control based on a deviation between the target current and the drive current of motor and a feedforward control section for executing feedforward control based on the target current. The apparatus has a feature that gain of the feedforward control is adapted to be greater as the speed of a vehicle increases.

Abstract: An electric power steering control device includes a memory. The memory is accommodated in the electric power steering control device mounted on a vehicle, and permits rewrite and storage of data. Transmitting a signal from an external of the vehicle allows the data stored in the memory to be rewritten.