Patent ID: 8489309
Filing Date: 2013-07-16
Classification: F02D,F02M

Abstract:
1. A feedback control system that sets, as a feedback gain, either a base gain, which has a constant value, or a variable gain, which is a variable value that decays from a value larger than the base gain to a value equal to the base gain, in accordance with a state of a control system and calculates an input value for a controlled object based on a specific function having, as variables, at least two terms including a proportional term and an integral term, characterized by comprising: a discriminant value calculation unit for setting, as a discriminant value, a value obtained by substituting a base proportional term, which is a proportional term calculated using said base gain irrespective of the state of the control system, for the proportional term in said specific function and substituting a normal integral term, which is an integral term calculated using a feedback gain that is set in accordance with the state of the control system, for the integral term in said specific function; and an integral term recalculation unit, which performs recalculation of the integral term in cases where said discriminant value is larger than a specific first upper limit value, for recalculating the integral term so that a value obtained by substituting said base proportional term for the proportional term in said specific function and substituting the recalculated integral term for the integral term in said specific function becomes equal to or smaller than said first upper limit value, wherein in cases where recalculation of the integral term is performed by said integral term recalculation unit, the input value for the controlled object is set to a value obtained by substituting a normal proportional term, which is a proportional term calculated using a feedback gain that is set in accordance with the state of the control system, for the proportional term in said specific function and substituting said recalculated integral term for the integral term in said specific function.