Abstract: A vehicular steering control apparatus controls the wheel steering amount of wheels based on a steering angle and an assist angle obtained by multiplying a steering speed by a gain. If the amount of power control differs between the left wheel and the right wheel, the value of gain is increased. The amount of power control includes, for example, the amount of braking control and the amount of drive control. If the assist angle is increased by increasing the gain, the magnitude of the wheel steering amount relative to the steering angle increases, so that a driver can correct the orientation of the vehicle body by performing a small amount of steering operation.

Abstract: A spiral cable device is provided with a cylindrical casing, an inner cylinder rotatable relative to the cylindrical casing, and a flexible flat cable connected to the inner cylinder at one end thereof and to the cylindrical casing at the other end thereof. The flexible flat cable has plural leads arranged in a single layer and is folded to form multiple layers of the leads, so that even where the flexible flat cable is to have many leads, the spiral cable device can be made short in the axial direction thereof.

Abstract: A base transmission ratio Gbase is determined according to the vehicle speed and a compensation amount &agr; is determined for each of feed steering case and return steering case during acceleration/deceleration. Based on this, the transmission ratio G of a transmission ratio varying mechanism is set as G=Gbase+&agr;.

Abstract: Target rotational speed of servo motor 31 is set based on steering speed &thgr;hv detected by steering speed sensor and transmission ratio G set according to a running condition, and speed of servo motor is controlled so that rotational speed &thgr;pv of servo motor detected by rotational speed sensor may agree with the target rotational speed.

Abstract: In a vehicle steering apparatus having a variable gear ratio unit arranged midway along a steering transmission system for connecting a steering wheel and tires to change the transmission ratio, and an ECU for variably controlling the variable gear ratio unit in accordance with the state of a vehicle, the variable gear ratio unit includes a motor controlled by the ECU, and a reducing mechanism which has a transmission ratio for allowing to maintain the steering angle of the steering wheel with respect to an RF reverse input and transmits the rotation of the motor to the output side. Even if a reverse input acts from a tire side during traveling, the relationship between the steering amount of the steering wheel and the turning amount of the tire can be kept unchanged.

Abstract: A vehicle steering apparatus having a variable gear ratio unit arranged midway along a steering transmission system for connecting a steering wheel and a tire to change a transmission ratio upon driving a motor includes a connecting unit for stopping actuation of the variable gear ratio unit in accordance with an external signal to connect the input side of the variable gear ratio unit which is connected to the steering wheel to the output side of the variable gear ratio unit which is connected to the tire. Even if a reverse input acts from a tire side during traveling, the relationship between the steering amount of the steering wheel and the turning amount of the tire can be kept unchanged.

Abstract: An object of this invention is to provide an electric power steering apparatus with good steering feeling. This electric power steering apparatus has a steering system for turning tires in accordance with manipulation of steering wheel, a power assist motor for assisting this turning of the tires by the steering system, a non-stage transmission with variable transmission ratios, interposed between the power assist motor and the steering system, and an ECU for controlling the transmission ratios of the non-stage transmission and for controlling the output of motor in accordance with the turning of the tires by the steering system.

Abstract: A power steering apparatus in which an adjusting operation for an orifice, which is provide to optimize a steering characteristic, can be easily performed. A rotary control valve controls an amount of working oil to be supplied to a power assist cylinder in response to a relative rotation between an input member and an output member. A counter force mechanism, provided in the rotary control valve, includes a counter force plunger, a hydraulic pressure counter force chamber located on an outer side of the counter force plunger and an inside chamber located on an inner side of the counter force plunger. The counter force mechanism provides a counter force to the input member by a pressure difference between a pressure of the working oil in the hydraulic pressure counter force chamber and a pressure of the working oil in the inside chamber. A hydraulic pressure control valve is attached to the rotary control valve.