Abstract: A turning behavior control device for a vehicle includes a yaw rate detector, a front wheel suspension, a rear wheel suspension, a brake device, a hydraulic pressure supplier, and a travel controller. The left and right front wheels of the vehicle are steered wheels and drive wheels. The travel controller includes a deviation value calculator configured to calculate a deviation between a standard yaw rate for determining a degree of understeer during turning of the vehicle and a yaw rate detected by the yaw rate detector, and a braking force controller configured to output, to the hydraulic pressure supplier, a first signal for applying braking forces to left and right front wheels in addition to a turning inner rear wheel when it is determined that the deviation calculated by the deviation value calculator exceeds a predetermined deviation reference value.

Abstract: An estimation device for estimating a friction coefficient of a road surface includes a sensor, a moment calculator, and a friction coefficient estimator. The sensor is configured to detect a force acting on a wheel. The moment calculator is configured to calculate a moment around a vertical axis at a center of a ground contact load of a tire of the wheel based on an output of the sensor. The friction coefficient estimator is configured to estimate the friction coefficient of the road surface with which the tire is in contact, based on the moment.

Abstract: A road surface determination apparatus includes an acceleration detector and a road surface determination unit. The acceleration detector is configured to detect an acceleration of a vehicle body or a vibration transmission member configured to transmit vibration from a tire to the vehicle body. The road surface determination unit is configured to determine a condition of a surface of a road, using a determination value obtained by extracting a component of a predetermined frequency band from the acceleration detected by the acceleration detector and integrating the component.

Abstract: A device for estimating a factor of one-side pull to be generated at a vehicle includes one or more sensors, a calculator, and an estimator. The one or more sensors are configured to detect an acting force on one or more sensors wheels. The calculator is configured to calculate a position of a center of a ground contact load based on information outputted by the one or more sensors. The estimator is configured to estimate the factor based on a lateral displacement of the center of the ground contact load.

Abstract: A device for estimating a factor of one-side pull to be generated at a vehicle includes one or more sensors, a calculator, and an estimator. The one or more sensors are configured to detect an acting force on one or more sensors wheels. The calculator is configured to calculate a position of a center of a ground contact load based on information outputted by the one or more sensors. The estimator is configured to estimate the factor based on a lateral displacement of the center of the ground contact load.

Abstract: An estimation device for estimating a friction coefficient of a road surface includes a sensor, a moment calculator, and a friction coefficient estimator. The sensor is configured to detect a force acting on a wheel. The moment calculator is configured to calculate a moment around a vertical axis at a center of a ground contact load of a tire of the wheel based on an output of the sensor. The friction coefficient estimator is configured to estimate the friction coefficient of the road surface with which the tire is in contact, based on the moment.

Abstract: A road surface determination apparatus includes an acceleration detector and a road surface determination unit. The acceleration detector is configured to detect an acceleration of a vehicle body or a vibration transmission member configured to transmit vibration from a tire to the vehicle body. The road surface determination unit is configured to determine a condition of a surface of a road, using a determination value obtained by extracting a component of a predetermined frequency band from the acceleration detected by the acceleration detector and integrating the component.