outside.setSpeed(_speed);
float steerRatio = 1 - rate/100.0f;
inside.setSpeed((int)(_speed*steerRatio));
if(angle == Integer.MAX_VALUE) {//no limit angle for turn
if(_parity == 1) outside.forward();
else outside.backward();
if( _parity*steerRatio > 0) inside.forward();
else inside.backward();
return;
}
float rotAngle = angle*_trackWidth*2/(_wheelDiameter*(1-steerRatio));