摘要:
A wheel suspension arrangement for a wheel carrier including a suspension spring and a hydraulic actuator has a valve controlling the actuator. A stroke sensor detects the position of the wheel carrier relative to the vehicle body, and an acceleration sensor detects the vertical component of acceleration of the vehicle body adjacent the wheel and provide signals to a controller, which derives force components acting on the vehicle body by the suspension spring and actuator, respectively. The controller derives a modified combined force acting on the body out of the force components and determines a force counterbalancing the modified combined force, and controls the valve to cause the actuiator to vary the force acting between the associated wheel carrier and the vehicle body by the force counterbalancing the modified combined force.
摘要:
In a vehicle suspension system including a hydraulic actuator between a sprung mass consisting substantially of a vehicle body and an unsprung mass consisting substantially of a wheel, a force proportional to but opposite in phase to an inertia force acting on the unsprung mass is applied by the actuator to the unsprung mass so that the ability of the tire to maintain contact with the road surface may be improved. This produces very little effect on the behavior of the sprung mass, but the vehicle handling is significantly improved. Better contact with the road surface not only improves the vehicle handling but also reduces the consumption of energy by the hydraulic actuator. A particularly favorable result can be obtained when the hydraulic actuator further applies a damping force proportional to the absolute velocity of the sprung mass to the sprung mass.
摘要:
An apparatus for estimating vibration input to be transferred from a road surface to a suspension device of a vehicle. The apparatus converts stroke displacement values (S.sub.FL, S.sub.FR) detected by stroke sensor (27FL, 27FR) arranged on locations near the front wheels into stroke speed values (S.sub.VFL, S.sub.VFR) by differentiating circuits (41a, 41b) including a high-pass filer whose cutoff frequency (f.sub.HC) is set at substantially twice the spring-bottom resonance frequency (20 Hz, for example). The apparatus further converts body work vertical acceleration values (Z.sub.GFL, Z.sub.GFR) detected by vertical acceleration sensors (28FL, 28FR) arranged on locations near the front wheels into spring-top speed values (Z.sub.VFL, Z.sub.VFR) by integrating circuits (41c, 41d) including a low-pass filter whose cutoff frequency (f.sub.LC) is set at nearly one sixth of the spring-top resonance frequency (0.2 Hz, for example). The apparatus adds these speed values to each other by adders (41e, 41f) to provide differential values (x.sub.OFL ', x.sub.OFR ' ) of the spring-bottom displacement values obtained by accurately estimating the vibration input from a road surface by cancelling the spring-top speeds with each other.
摘要:
A system and method for controlling a damper of vehicular suspension in which when the vehicle runs on a paved road and a frequency at which the detected sprung mass acceleration exceeds a dead zone is below a set value, the damping force characteristic is optimally controlled in a predetermined variable range. When the vehicle runs on a rough road and a frequency at which the detected acceleration exceeds the dead zone is above the set value, a minimum damping force limit of the predetermined variable range of the damping force characteristic is shifted toward a relatively high damping force side, The dead zone is set with an average value of the acceleration of sprung mass as a center. Hence, when the vehicle turns and zigzags, the vehicular body is inclined so that an absolute value of the sprung mass acceleration is largely changed. In this case, when an average value of the acceleration of the sprung mass is accordingly changed and the dead zone is accordingly shifted. Thus, the frequency at which the sprung mass acceleration exceeds the dead zone accurately corresponds to a situation on a road surface and the damping force characteristic is accurately controlled according to the road surface condition.
摘要:
A suspension system for motor vehicles is disposed between body (1) and wheel (2) and is provided with a damper (4) with integrated resonance dampers (40, 48) for improved insulation of transmission of road unevenness to the body. The resonance damper is formed in that the casing (40) of the damper (4) forms a moving mass m.sub.40 between the body (1) and the wheel (2), the casing being connected to the wheel via a spring (48) harmonized with the mass m.sub.40. The pistons (41, 42) of the damper are connected via piston rods (43, 44, respectively) to the body (1) and the wheel (2), respectively. By a fixed adaptively regulated flow between the chambers (5--7) formed in the damper (4) in response to parameters dependent upon the oscillation cycle, there will be obtained improved insulation primarily in those resonance ranges which are typical for suspension systems for motor vehicles,
摘要:
A method and apparatus for absorbing mechanical shock is disclosed. The apparatus comprises a pressure cylinder forming a working chamber having first and second portions operable to store damping fluid. The apparatus further comprises the first valve for controlling the flow of damping fluid between the first and second portions of the working chamber during compression of the shock absorber. In addition, the apparatus further comprises a pressure chamber in fluid communication with the first portion of the working chamber and the first valve. A solenoid is also provided for regulating the flow of damping fluid between the pressure chamber and the second portion of the working chamber. A second valve is further provided for controlling the flow of damping fluid between the first and second portions of the working chamber during rebound of the shock absorber.
摘要:
A suspension control system for a suspension supporting a mass body on a support base via a parallel combination of a shock absorber having a variable damping coefficient and a spring. The control system cyclically measures absolute velocity (Z) of the mass body along a moving path of expansion and contraction of the shock absorber, relative velocity (Y) of the mass body in reference to the support base along the moving path, and acceleration (Z) of the mass body along the moving path. A control unit of the control system controls the damping coefficient according to a ratio (Z/Y) of the absolute velocity to the relative velocity with cyclic readjustment thereof so that at least either the damping coefficient is greater relative to the ratio when the acceleration is rich in low frequency components or a frequency of the cyclic readjustment of the damping coefficient is lower when the acceleration is rich in high frequency components.
摘要:
The posture of a vehicle is controlled using a specific variable damping force damper without the necessity of changing over the variable damping force damper frequently and at a high rate and without using a vehicle height sensor. A variable damping force damper U having at least two change-over modes including a mode in which the compression side damping force is soft when the extension side damping force is hard and another mode in which the compression side damping force is hard when the extension side damping force is soft is interposed between a vehicle body D and a wheel E. The variable damping force damper U is changed over by means of an acceleration sensor J mounted on the vehicle body D and a controller M including an integrator P for converting a signal from the acceleration sensor J into a velocity signal and a calculation processing circuit Q for outputting a changing over signal to the variable damping force damper U in accordance with the velocity signal from the integrator P.
摘要:
A method and apparatus for controlling suspension deflection in a semiactive damping system is disclosed. A semiactive control policy operates to set the damper force to a low magnitude when the relative position of the suspension members is within a "null band," and to a high magnitude when the relative position is within an "overshoot" band. The null band is a predefined range of displacement about the equilibrium position of the members and the overshoot band is a range about the end stops. When in the overshoot band, the high damper force limits the incidence of suspension end stop collisions that cause damaging shock inputs to the system. The high damper force is maintained once the overshoot band is entered until the relative position of the members again reaches the equilibrium position. One or more intermediate or "active" bands are defined to exist between the null and overshoot bands. When in the active band(s), the damper force is set to an intermediate magnitude to thus stiffen the suspension. A controller produces an output signal indicative of the instantaneous relative position of the members for use by the control policy from a relative velocity signal.
摘要:
An active suspension system for an automotive vehicle is arranged to regulate the attitude of a vehicle body in a flat or balanced state by controlling hydraulic cylinders respectively disposed between a vehicle body and a road wheel, in response to an attitude change of the vehicle body. The active suspension system comprises electromagnetically operated variable vibration attenuation valves, each of which is fluidly connected with each hydraulic cylinder and is followed by an accumulator. Each variable vibration attenuation valve is adapted to be variable in its attenuation constant in response to a vertical acceleration experienced by the road wheel. The variable vibration attenuation valve takes on a low attenuation constant to maintain a high riding quality of the vehicle under a normal cruising condition, and a high attenuation constant to suppress the response of the road wheel under a rough road cruising condition.