Parameter control device and control method

A parameter control method for controlling an increase/decrease in parameter value based on the number of pulses generated in response to desired angle rotation of an operator, comprising:

• a current value storing step of storing a current value of a parameter value in response to the operator;
• a current value adding/subtracting step of adding/subtracting the number of generated pulses of the operator to/from the current value;
• a counting step of calculating a cumulative pulse number count value by cumulatively counting the number of generated pulses of the operator;
• a measurement time setting step of setting a measurement time in which the number of generated pulses is measured from a current value of the parameter value and a maximum value or a minimum value that the parameter value can take;
• a threshold setting step of leading a desired angle of rotation from a current value of the parameter value and a maximum value or a minimum value that the parameter value can take, and respectively setting thresholds of the number of generated pulses corresponding to the rotation to the maximum value side and the minimum value side;
• a comparing step of comparing the cumulative pulse number count value within the measurement time and the thresholds;
• an output determining step of setting, in rotation in a direction of increasing the parameter value of the operator, the parameter value to the maximum value when the cumulative pulse number count value is larger than the maximum-side threshold, setting the parameter value to a value obtained through the current value adding/subtracting step when the cumulative pulse number count value is smaller than the maximum-side threshold, and
• on the other hand, in rotation in a direction of decreasing the parameter value of the operator, setting the parameter value to the minimum value when the cumulative pulse number count value is larger than the minimum-side threshold, and setting the parameter value to a value obtained through the current value adding/subtracting step when the cumulative pulse number count value is smaller than the minimum-side threshold.