102results about How to "Improved vibration suppression effect" patented technology

A control system for an electric vehicle has a vehicle speed calculation section that calculates a speed of the electric vehicle and a control unit that controls an inverter of an electric motor to provide road wheels with a predetermined reference torque in accordance with a manipulated value of an accelerator pedal, wherein the unit has a reference torque correction section that changes the reference torque from an original value and then returns the changed reference torque to the original value when a calculated speed of the electric vehicle is in a given speed range.

Provided is a control device for an internal combustion engine for controlling an output torque of the internal combustion engine which drives a vehicle. When the device detects that a torque required by the engine has changed suddenly, a feed forward correction amount is generated for a correction period substantially identical to a resonance cycle of a drive system of the vehicle. The output torque control amount of the engine is corrected by the feed forward correction amount. By accumulating a required torque change amount, the torque change amount accumulation value is calculated and the feed forward correction amount is generated in accordance with the torque change amount accumulation value.

An electric power steering apparatus that is capable of obtaining a more safe and comfortable handling performance by signal processing of road information and disturbances is performed to realize easy tuning, and vibration absorption level for brake is improved by a filter and a gain unit considering a frequency characteristic and a decelerating acceleration.

The invention provides a resonance-peak-free hydraulic vibration isolator and a vibration reducing module of the resonance-peak-free hydraulic vibration isolator. The resonance-peak-free hydraulic vibration isolator comprises the vibration reducing module, a damping module and a connecting module. The vibration reducing module comprises a hydraulic limiting vibration reducing device and a main spring. The damping module comprises a waist-drum-shaped damping sleeve, a first damper and a second damper. The connecting module comprises an upper end cover, an upper limiting end cover, a middle cylinder, a lower end cover with a cylindrical protrusion, and a base. According to the resonance-peak-free hydraulic vibration isolator, the implementation structure of the damping module is simple, the structure of the combination between the bi-directional hydraulic vibration reducing device and the double dampers in the damping module can be matched with the waist-drum-shaped damping sleeve to provide stable damping force in the perpendicular direction and the horizontal direction, perpendicular bi-direction limiting can be achieved, a good centering reset effect on transverse vibration is achieved, and the resonance damping effect is good.

The invention discloses an active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection. The active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection comprises a basic platform (10), a load-bearing platform (30), a passive vibration isolation unit and an active vibration isolation unit, wherein the passive vibration isolation unit is provided with a positive-stiffness air spring (20) and a magnetic negative-stiffness mechanism (28) with adjustable negative stiffness in the first direction, so that the inherent frequency in the first direction is decreased, and the passive vibration isolation unit is provided with a stiffness-adjustable positive-stiffness leaf spring and a negative-stiffness inverted pendulum in the second direction, so that the inherent frequency in the second direction is decreased; the active vibration isolation unit is arranged at the outer side of the passive vibration isolation unit, the upper end of the active vibration isolation unit is linked with the load-bearing platform (30), and the lower end of the active vibration isolation unit is linked with the basic platform (10); and the active vibration isolation unit comprises displacement sensors, speed sensors, a proportional pressure valve and a voice coil motor, and the voice coil motor is used for fine adjustment of the load-bearing platform, so that vibration is further isolated. The active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection has high bearing capacity, and active and passive vibration isolation of two degrees of freedom is achieved at the same time.