Toyota Jidosha Kabushiki Kaisha

Masao Ueyama

Takahiro Kojo

Yoji Kunihiro

Yoshiaki Suzuki

Yoshio Kudo

Yukihide Kimura

Takeshi Goto

Theerawat Limpibunterng

Masateru Amano

An automatic speed control device includes: an upper limit lateral acceleration degree setting part for setting an upper limit lateral acceleration degree; a road curvature acquiring part for acquiring a value of a curvature parameter relating to curvature of a road; an upper limit speed setting part for calculating a speed of the vehicle at which if the vehicle runs on that road, the lateral acceleration degree of the vehicle becomes the upper limit lateral acceleration degree and setting the calculated speed as the upper limit speed; and a speed control part for controlling the speed of the vehicle to be less than or equal to the upper limit speed. The upper limit lateral acceleration degree when running on a connecting road is set lower than the upper limit lateral acceleration degree when running on a main road of a motorway.

Automatic speed control device, automatic speed control method, and automatic speed control program

An automatic speed control device includes: an upper limit speed setting part for setting a first speed as an upper limit speed during running on a main road and setting a second speed slower than the first speed as the upper limit speed during running on a connecting road; a target speed setting part for setting a target speed to less than or equal to the upper limit; and a speed control part for controlling a vehicle speed based on the target speed. The speed control part makes the vehicle accelerate according to a depression amount of the accelerator pedal when the pedal is depressed. The upper limit speed setting part sets the upper limit speed to a speed faster than the second speed and less than the first speed when the vehicle speed has become faster than the second speed due to depression of the pedal.

The power steering device is configured to: apply a required assist force only from a first electric motor until a predetermined period elapses, which is a period from a time point at which a driver starts steering to a time point at which a second-electric-motor drive start condition, which is a condition for starting drive of a second electric motor, is satisfied; when the predetermined period has elapsed, apply the required assist force from the first electric motor and a hydraulic actuator; and adjust an assist force by the first electric motor so that the assist force by the first electric motor is a value obtained by subtracting an assist force by the hydraulic actuator from the required assist force. As a result, the device can be downsized, and a sufficient required assist force can be generated from an initial stage of the steering.

Power steering device

A driving support apparatus for a vehicle comprising a steering device that steers steerable wheels, and a control unit configured to execute a running control in which a steered angle of the steerable wheels is changed by controlling the steering device, the control unit being configured to calculate a deviation between an index value of a target running state of the vehicle and an index value of an actual running state, to calculate a target change amount of the steered angle based on the index value deviation, to control the steering device so that a change amount of the steered angle conforms to the target change amount, and to limit a magnitude of a time change rate of the steered angle changed by the running control when one of a magnitude of the index value deviation and a magnitude of the target change amount exceeds a reference value.

Driving support apparatus for vehicle

A driving support device may be configured to calculate a target steering angle for allowing a vehicle to travel along a target course; set, as a reference steering angle, a steering angle when a difference between the steering angle and the target steering angle is small; calculate an indication value indicating intention of a driver's steering operation as a sum of a first product of a corrected steering angle and a steering torque, a second product of a derivative of the corrected steering angle and the steering torque, and a third product of the corrected steering angle and a derivative of the steering torque; and correct the target steering angle based on the indication value so that a target driving support torque is corrected in accordance with the intention of the driver's steering operation.

Driving support device for vehicle including an electric power steering control that generates a steering assist torque

A control device () for an electric power steering device () is configured to: store a basic target return speed (Vrb), which increases in magnitude as the magnitude of a steering angle (&#x3b8;) increases; calculate, when a steering wheel () is being returned to a neutral position, the basic target return speed (Vrb) based on an actual steering angle (Step); calculate a transitional target return speed (Vtrt), which gradually increases in magnitude and gradually approaches the basic target return speed as the magnitude of the actual steering wheel decreases; and control, when the magnitude of a difference between the basic target return speed and the transitional target return speed is more than a reference value, a steering assist torque so that a return speed reaches the transitional target return speed (Stepto Step).

Electric power steering device

A vehicle drive-control device which executes trajectory control in which steered wheels are controlled so as to make the vehicle travel along a target trajectory. When the possibility exists that the travel direction of the vehicle may be changed by the trajectory control, at least one of an operation position of a steering input unit operated by a driver; a yaw angle of the vehicle; and a lateral position of the vehicle with respect to a lane is changed before a change in the travel direction is made, thereby giving occupants in the vehicle advance notice of the possibility of a change in vehicle travel direction caused by the trajectory control.

Vehicle drive-control device

A steering intention determination device includes a calculation unit that calculates a value based on the product of a steering angular velocity and a steering torque and the product of a steering angle and the time differential value of the steering torque, and a determination unit that determines that the driver has a turn-and-steer steering intention in a case where the value is equal to or greater than a predetermined value, determine that the driver has a steering holding intention in a case where the value is less than the predetermined value and the absolute value of the steering angular velocity is less than a predetermined angular velocity, and determine that the driver has a switchback steering intention in a case where the value is less than the predetermined value and the absolute value of the steering angular velocity is equal to or greater than the predetermined angular velocity.

Steering intention determination device, vehicle control device, steering assist device, and steering assist system

A steering system includes a steering angle detection unit that detects a steering angle of a steering wheel; a steering torque detection unit that detects a steering torque with respect to the steering wheel; an ECU that calculates a corrected steering angle by nonlinearly correcting the steering angle, a first steering parameter as the product of an angular velocity of the steering angle and the steering torque, a second steering parameter as the product of the corrected steering angle and a time differential value of the steering torque, and a target control amount based on the first steering parameter and the second steering parameter; and a steering support unit that applies a rotation torque to the steering wheel based on the target control amount.

Growing community of inventors

Mishima, Japan

Masao Ueyama