摘要:
An electric actuator (electric motor) is thermally protected without causing any unfamiliar impression in steering a vehicle. A temperature compensation gain computing unit (25) reduces the manipulated variable of the electric actuator (40L, 40R) by using a gain that diminishes with the rise in the temperature of the actuator.
摘要:
A suspension system for a vehicle, including: an electromagnetic actuator configured to generate an actuator force and including a sprung-side unit connected to a sprung portion, an unsprung-side unit connected to an unsprung portion, and an electromagnetic motor; a connecting mechanism; and a controller including a target-actuator-force determining portion, the determining portion being configured to determine a target actuator force based on: (a) a required acting force that is a force required to act between the sprung and unsprung portions; and (b) an inertial force of one of the sprung-side and unsprung-side units, while utilizing: a first transfer function by which is outputted an amount of a displacement of the one of the sprung-side and unsprung-side units when the actuator force is inputted; and a second transfer function by which is outputted an actual acting force which actually acts between the sprung and unsprung portions when the displacement amount is inputted.
摘要:
It is an object of the invention to provide a suspension system configured to execute a control for avoiding a state in which an operation of an electric motor which is a power source of an electromagnetic actuator is kept halted at a certain operational position while the motor is generating a motor force. Where a target rotational position of the motor becomes equal to a specific operational position (e.g., a rotational position at which an electrifying current amount of one phase reaches a peak value), a control for shifting the target rotational position by δθ is executed. Where the rotational position of the motor is kept located at the certain position for a time period longer than a prescribed time, a control for changing the rotational position of the motor is executed. According to the present suspension system, it is possible to suppress imbalance in heat generation in the motor and to thereby reduce a load to be applied to the motor. Accordingly, a suspension system with high utility is realized.
摘要:
An active suspension system has a plurality of actuators which are respectively installed between a wheel and a vehicle body and individually produce a control force, and a control unit which controls an attitude change of a vehicle by controlling the each control force of the plurality of actuators. The control unit sets first and second virtual control lines which extend along a front-and-rear direction of the vehicle and a width direction of the vehicle respectively and are changed so that the first and second virtual control lines follow expected pitching and rolling that would occur to the vehicle, and then controls the vehicle attitude so that the vehicle attitude is brought closer to the virtual control line.
摘要:
A control system (11) for a vehicle (10) includes vehicle dynamics sensors (35-47) providing a vehicle dynamics signal. Tire monitoring system sensors (20) in each wheel generate tire signals including temperature, pressure and acceleration data. A controller (26) communicates with the tire monitoring system sensors (20) and at least one vehicle dynamics sensor, and generates a roadway surface condition estimation value as a function of the multi-axis acceleration data of the tire signals. The roadway surface condition estimation value is transmitted to a suspension control system (33) to adjust the vevhicle suspension characteristics in response to the roadway surface condition estimation value.
摘要:
A method and apparatus for controlling frame rise on a heavy duty truck having a frame, a drive axle connected to the frame, and a selectively lockable suspension component disposed therebetween for maintaining the relative position therebetween. Signals indicative of at least one of the following vehicle operating parameters: engine speed, brake pressure, vehicle speed, air bag pressure, steering wheel angle, vehicle height, or throttle position are monitored and a predicted thrust is calculated that will be applied to the drive axle based on the monitored signals. The selectively lockable suspension component is locked if the predicted thrust exceeds a predetermined threshold and is also controlled with respect to other operating parameters such as whether vehicle brakes are applied, any instantaneous change in torque, vehicle operating speed, and the length of time the selectively lockable suspension component has been locked.
摘要:
According to the controller for an adaptive electronic suspension system and the control method of the system, it becomes possible to improve the driving performance and steering stability by controlling the damping force of the variable damper considering vehicle speed, steering angle, opening amount of throttle valve, up/down acceleration, brake operation, axle acceleration etc., wherein the controller for an adaptive electronic suspension system includes a vehicle speed sensor, a steering angle sensor, a throttle position sensor, an up/down acceleration sensor, a brake switch, an axle acceleration sensor and an electronic controller for controlling to convert damping force of dampers of four wheels into nullhard modenull, nullmedium modenull and nullsoft modenull by checking up driving state of the vehicle according to detecting signals output from the sensors and driving front and rear actuators to change passages by rotation of control rods.
摘要:
Vehicle speed is measured and used to calculate lateral acceleration of the vehicle and speed dependent thresholds to which the lateral acceleration of the vehicle is compared to determine when to change a controllable suspension system of the vehicle to improve operation of the suspension system. The controllable suspension system includes air springs and variable damping shock absorbers switchable between soft and firm damping rates. At speeds above a given speed, lateral accelerations exceeding first speed dependent thresholds will result in switching the shock absorbers to firm and/or closing gate valves which intercouple the left and right air springs to decrease vehicle roll. For slower speeds less than the given speed, the suspension system control is desensitized such that lateral accelerations of the same given magnitudes, for example due to entering a parking space or other low speed maneuver, do not alter the suspension. Switch back of shock absorbers from firm to soft and opening of the gate valves can be based on expiration of an elapsed time period or detection of the lateral acceleration of the vehicle falling below second speed determined thresholds.
摘要:
An electronically controlled fluid suspension system detects an average longitudinal or lateral acceleration within a predetermined period, computes an acceleration difference between a maximum average acceleration and a minimum average acceleration. Based on the acceleration difference, an estimated longitudinal or lateral acceleration is computed. In response to the estimated longitudinal or lateral acceleration, computed are a height-raising quantity of a lowered portion of a vehicle and a height-lowering quantity of a raised portion thereof. The supply and release of a fluid to and from fluid springs is rapidly controlled so that the height-raising quantity of the lowered portion of the vehicle is less than the height-lowering quantity of the raised portion thereof. The electronically controlled fluid suspension system, thus, prevents the vehicle from inclining due to changes in driving status, and enhances a road-adherence ability on an uneven road as well as a steering stability.
摘要:
An operating system for a multistable suspension unit having a plurality of predetermined operating states includes a suspension control unit which selects a preferred suspension unit operating state based upon input parameters including vehicle speed and linear acceleration and predicted lateral acceleration. The system includes a sensor for determining steering center position and steering system excursion angle and angular velocity.