摘要:
An "active" suspension system provides two parallel force-transmitting paths between the body and wheel of a vehicle. The first path has a main spring (41), and the second path includes an actuator (42) and a spring (43). LVDT's (53,55) are arranged to monitor the displacements of the actuator (42) and the spring (43). The actuator is arranged in a high-gain closed position or velocity servoloop. The actual force (F.sub.w) exerted by the suspension system on the body is determined and compared with a desired force (F.sub.c) to produce a force error signal (F.sub.e). The force error signal (F.sub.e) is converted to a command signal supplied to the servoloop. The servoloop operates the actuator (42) so as to continuously drive the force error signal (F.sub.e) toward zero.
摘要:
A suspension control system has a manual operator which is manually accessible is provided for adjusting suspension control characteristics depending upon the driver's tastes or depending upon the vehicle condition. The adjustment of the suspension control characteristics can take place with respect to each of a plurality of suspension control items, such as roll-suppressive suspension control, anti-dive suspension control, anti-scout suspension control, road roughness dependent suspension control, bottoming control and so forth. By allowing adjustment of the suspension control characteristics with respect to each control item independently of that with respect to other control items, the suspension control characteristics of the overall suspension control system can be precisely fit the driver's feeling and/or precisely adapted to the vehicle condition.
摘要:
Off-highway trucks generally rely on a suspension system which employs a plurality of gas-over-liquid type struts. These struts are critical to proper operation of the vehicle such that a single collapsed strut can have serious manifestations in structural damage, tire wear, and payload monitor accuracy. These consequences can be mitigated by an accurate and reliable strut monitor. Pressure type sensors are disposed on each of the struts and their pressure is monitored during three critical phases of operation. These phases include static, loading, and roading modes and each mode requires a distinct method for detecting a collapsing strut. The presence of a collapsing strut, detected by any of the three methods, is communicated to the vehicle operator whereby operation can be immediately suspended. The system avoids the serious consequences of vehicle operation with a collapsed strut by providing the operator with immediate and positive feedback on the condition of the struts.
摘要:
A suspension control system is able to precisely adapt damping characteristics to the road condition, even when the vehicle passes over bump, manhole, hole and so forth. The suspension control system includes a road sensor which produces a road condition indicative signal. A controller is adapted to recognize bump, manhole, hole and so forth which causes temporary bounding and rebounding motion for the vehicle, on the basis of the road condition indicative signal from the road sensor. The controller produces a control signal to harden damping characteristics of suspension when bump, manhole, hole and so forth is detected with a given delay time. The delay time for changing damping characteristics is different at the front and rear suspension from each other so that each of the front and rear suspension can be stiffened at a good timing.
摘要:
Apparatus for controlling a vehicle suspension system includes acceleration sensors mounted on the vehicle for producing electrical signals representative of road surface undulations or irregularities, processing circuitry for processing the sensor signals to produce control signals, and a shock absorber or damper having adjustable damping characteristics. The damper preferably includes two chambers connected by a controllable bypass. One of the chambers becomes smaller during compression of the suspension system, and one becomes smaller during expansion. A controllable throttle and/or valve is provided in the bypass to adjust the damping characteristic of the absorber. The circuitry produces control signals H and w which are representative of the average height of the overall road surface undulations, and a ratio of average heights of long-wave and short-wave undulations, respectively. The circuitry further processes these signals to produce control signals F and P to control the bypass throttle and/or valve, respectively, in accordance with the following relationship:P=a.sub.o +a.sub.1 H+a.sub.2 w+a.sub.3 HwF=b.sub.o +b.sub.1 H+b.sub.2 w+b.sub.3 Hwwhere, a.sub.o -a.sub.3 and b.sub.o -b.sub.3 are predetermined constants.
摘要翻译:用于控制车辆悬架系统的装置包括安装在车辆上的加速度传感器,用于产生代表路面起伏或不规则的电信号,用于处理传感器信号以产生控制信号的处理电路,以及具有可调阻尼特性的减震器或阻尼器。 阻尼器优选地包括通过可控旁路连接的两个腔室。 其中一个室在悬挂系统的压缩过程中变小,在膨胀期间变小。 在旁路中设置有可控制的节流阀和/或阀,以调节吸收器的阻尼特性。 电路产生代表整个路面起伏的平均高度的控制信号H和w,以及长波和短波起伏的平均高度的比值。 电路进一步处理这些信号以产生控制信号F和P,以分别根据以下关系控制旁路节流阀和/或阀:P = ao + a1H + a2w + a3Hw F = bo + b1H + b2w + b3Hw 其中,ao-a3和bo-b3是预定的常数。
摘要:
A suspension control system includes a suspension system variable of stiffness and/or damping characteristics, a road sensor producing a road condition indicative signal and a controller for controlling the stiffness and/or damping characteristics of the suspension system depending upon the road condition indicative signal value and the vehicle speed indicative signal value. The controller is detective of the vehicle speed in a predetermined normal speed range which is defined by a lower speed criteria and an upper speed criteria, for generally maintaining the stiffness or damping characteristics of the suspension in relatively soft. The controller is detective of the vehicle speed indicative signal value smaller than the foregoing lower speed criteria to increase sensitivity of the road sensor and/or harden the suspension system at harder level than that in the normal speed range when the roughness of the road surface beyond a rough road criteria. Also, the controller is detective of the vehicle speed indicative signal value greater than the upper speed criteria for increasing sensitivity of the road sensor and/or harden the suspension system at harder level than that in the normal speed range when the roughness of the road surface beyond a rough road criteria, the relative displacement between a vehicle body and a road wheel, a vehicle speed sensor producing a vehicle speed indicative signal.
摘要:
An active suspension apparatus detects a relative displacement (x) between an axle and a vehicle body, discriminates a road surface state in accordance with the relative displacement and a change rate (x) in unit time which is derived from the relative displacement (x), and optimally controls characteristics of damping forces of hydropneumatic suspensions in accordance with a discrimination result (i.e., a road surface state). This discrimination is performed in accordance with a sum (Ax+Bx) of a signal obtained by multiplying the relative displacement (x) with a predetermined coefficient and a signal obtained by multiplying the change rate (x) with another predetermined coefficient. These coefficients are obtained in accordance with riding comfort against vibrations. The characteristics of the damping force of the hydropneumatic suspension are controlled by controlling the opening of throttle valves disposed between hydropneumatic chambers and actuators.
摘要:
With the purpose of attaining effective reduction of vertical vibrations, there is arranged in vertical direction between the vibrating mass and the excitation source one or more little-damped springing systems which include compressed-air springing elements provided with a connecting pipe for the inlet or outlet of compressed air, whereby active intervention in the functioning of base springing systems is made possible. The active intervention concerns the vibrating of the mass in the resonance of the systems, and consequently, these systems may be provided only with the dampers which enable low damping or may be even without dampers at all. Moreover, between the vibrating mass and one or more springing systems, or between the springing systems and the excitation source, there is arranged one or more acceleration transformers in vertical direction. The deformation of each acceleration transformer amplified by the corresponding deflection amplifier opens its main valves, which proportionally to their displacement in the sense of opening thereof, let compressed air flow into the corresponding springing element or out of it into the atmosphere.
摘要:
A wheel suspension arrangement for a wheel carrier including a suspension spring and a damper has a valve, controlling the damper. A displacement transducer detects the position of the wheel carrier relative to the vehicle body and provides an input to a function generator which produces an output corresponding to the required value of the acceleration of the wheel carrier. A comparator compares the actual acceleration with the desired acceleration and controls the valve accordingly.