Actuator drive control device for active vibration isolation support system, and actuator drive control method for the same

Abstract

In an actuator drive control device for an active vibration isolation support system, accumulated time of eight time intervals tn of crank pulses which are outputted at every 15 degrees of a crank angle in a vibration period corresponding to 120 degrees of the crank angle, and average accumulated time shown by a straight line connecting a start point and an end point of the line of the accumulated time are calculated. Eight deviations Δtn are calculated by subtracting the average accumulated time from the accumulated time. A variation waveform of the deviations Δtn corresponds to a variation waveform of the time interval tn of the crank pulses attributable only to the engine vibration with the influence of a variation in the engine rotational speed Ne being eliminated.

1 . An actuator drive control device for an active vibration isolation support system, comprising a control apparatus which controls an operation of an actuator based on a vibration state of an engine which is estimated from a rotational variation of a crankshaft, so as to suppress transmission of a vibration of the engine, 
 wherein the control apparatus calculates accumulated time of time intervals of crank pulses outputted at each predetermined crank angle for one period of engine vibration; calculates average accumulated time averaged for the one period of engine vibration; and controls the actuator of the active vibration isolation support system based on the vibration state of the engine which is estimated from a variation waveform of deviation obtained by subtracting the average accumulated time from the accumulated time at each predetermined crank angle.    
   
   
       2 . The actuator drive control device for the active vibration isolation support system according to  claim 1 , wherein the control apparatus calculates the average accumulated time based on the accumulated time over the one period of engine vibration.  
   
   
       3 . The actuator drive control device for the active vibration isolation support system according to  claim 1  or  2 , wherein the control apparatus calculates torque around the crankshaft based on the deviation at each predetermined crank angle, and estimates the vibration state of the engine based on a difference between a maximum torque value and a minimum torque value which are adjacent in time.  
   
   
       4 . An actuator drive control method for an active vibration isolation support system, for controlling an operation of an actuator based on a vibration state of an engine which is estimated from a rotational variation of a crankshaft in order to suppress transmission of engine vibration, the method comprising: 
 a first step of calculating accumulated time of time intervals of crank pulses outputted at each predetermined crank angle for one period of engine vibration;    a second step of calculating average accumulated time averaged for the one period of engine vibration;    a third step of calculating deviation obtained by subtracting the average accumulated time from the accumulated time at each predetermined crank angle;    a fourth step of estimating the vibration state of the engine from a variation waveform of the deviation; and    a fifth step of controlling the actuator of the active vibration isolation support system based on the vibration state of the engine.    
   
   
       5 . The actuator drive control method for an active vibration isolation support system according to  claim 4 , wherein the second step involves calculation of the average accumulated time based on the accumulated time over the one period of engine vibration.  
   
   
       6 . The actuator drive control method for an active vibration isolation support system according to  claim 4  or  5 , wherein the fourth step involves calculation of torque around the crankshaft based on the deviation at each predetermined crank angle, and estimation of the vibration state of the engine based on a difference between the maximum torque value and the minimum torque value which are adjacent in time.