Abstract: In automatic vehicular velocity controlling apparatus and method for automotive vehicle having a function to maintain an inter-vehicle distance from the vehicle to a preceding vehicle which is running ahead of the vehicle at a target inter-vehicle distance, a response characteristic of an inter-vehicle related feedback control system is determined in accordance with a relative velocity of the vehicle to the preceding vehicle is corrected in accordance with the inter-vehicle distance, is corrected in accordance with a modification of a set inter-vehicle time duration by a vehicular occupant, and in accordance with an external disturbance value correspond to a road surface gradient of a slope during a vehicular run on the slope, in order to improve the response characteristic for the vehicular occupant not to give an un-match feeling to a driving sense.

Abstract: A vehicle speed control system is adapted to a vehicle equipped with an automatic transmission with a torque converter. The vehicle speed control system detects whether the automatic transmission is put in a lock-up condition, and corrects a command drive torque according to the lock-up condition of the automatic transmission. Particularly, the vehicle speed control system decreases a correction quantity of the command drive torque when the automatic transmission is put in the un-lockup condition. Therefore, the vehicle speed control system can adapt its response characteristic to a controlled system response characteristic which varies according to the lock-up condition of the transmission.

Abstract: A vehicle speed control system for a vehicle comprises a lateral acceleration sensor, a vehicle speed sensor, a target vehicle speed setting device, a drive system of the vehicle, and a controller connected. The controller is arranged to calculate a correction quantity on the basis of the lateral acceleration and the vehicle speed, to calculate a command vehicle speed on the basis of the vehicle speed, the target vehicle speed, a variation of the command vehicle speed and the correction quantity, and to control the drive system to bring the vehicle speed closer to the command vehicles speed.

Abstract: An apparatus for controlling a motion of a vehicle supported on steered and non-steered road wheels. A target vehicle motion value is calculated based on the steering angle and vehicle speed to provide a predetermined response characteristic related to a vehicle plane behavior. A target steering angle value for the non-steered road wheel to realize the vehicle plane behavior is calculated according to the target vehicle motion value. The non-steered road wheels are steered according to the calculated target steering angle value. The damping characteristic of the response characteristic is decreased as the vehicle speed increases.

Abstract: In a control apparatus for controlling a gear shift ratio of a continuously variable transmission mounted in an automotive vehicle as an automatic power transmission, a gear shift ratio command value is calculated using a control constant corresponding to a dynamic characteristic determined for each instantaneous gear shift ratio of the continuously variable transmission so as to achieve a target gear shift ratio response characteristic.

Abstract: In a steering angle control system including a feed-forward control for producing a desired vehicle motion variable and a feedback control for suppressing disturbances, a controller calculates a corrected steering angle from a detected steering angle and a premeasured characteristic of a steering system. The desired vehicle motion variable is calculated from a vehicle speed and the corrected steering angle. The feedback control is executed according to the difference between the desired and detected vehicle motion variables. Therefore, a driver can control a vehicle with a smooth control response in spite of a non-linear characteristic of the steering system.

Abstract: In current servo amplification/control apparatus and method for a reversible DC motor applicable to a vehicular four-wheel steering system, a motor current detection circuit and a motor current feedback circuit are eliminated and a motor counter-electromotive force is estimated using a dynamic characteristic of the motor, a positioning currenu, and an angular displacement information of the motor, and the motor power supply voltage directly measured is corrected using the estimated counter- electromotive force. Thus, a positioning response of the motor is derived which is approximately coincident with a design target even when the motor is rotated at a high speed.

Abstract: In a control system for an actuator applicable to a servo system in which a low resolution sensor and/or an operation detection signal having noise components is used as a feedback signal, a low-pass filter is disposed in a feedback loop of the servo system whose cut-off frequency is varied according to an operating condition of the actuator, e.g., an operation speed of the actuator.