发明名称 |
Feedback control system |
摘要 |
An object of the invention is to provide a feedback control system that calculates a P term and an I term on the basis of a deviation between a target value and a measured value of a control amount, and calculates a correction amount to be applied to an operation amount of a control subject on the basis of a PI term, which is a sum of the P term and the I term, wherein divergence of the I term in a condition where the PI term is restricted by a guard is prevented while improving a convergence property of the I term following removal of the restriction applied to the PI term by the guard. For this purpose, the feedback control system calculates, as a corrected previous value of the I term, a value obtained by subtracting a difference between a value of the PI term prior to restriction by the guard and a value of the PI term following restriction by the guard, from a value of the I term, and then updates the value of the I term by adding an update amount calculated from the deviation between the target value and the measured value of the control amount to the corrected previous value of the I term. |
申请公布号 |
US9228528(B2) |
申请公布日期 |
2016.01.05 |
申请号 |
US201114359774 |
申请日期 |
2011.11.22 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
Aoyagi Shinsuke |
分类号 |
F02D41/24;F02D41/34;F02D41/00;G05B11/42 |
主分类号 |
F02D41/24 |
代理机构 |
Kenyon & Kenyon LLP |
代理人 |
Kenyon & Kenyon LLP |
主权项 |
1. A feedback control system that calculates a P term and an I term on the basis of a deviation between a target value and a measured value of an air-fuel ratio, and calculates a correction amount to be applied to at least one of fuel injection amount and an air amount of an internal combustion engine on the basis of a PI term, which is a sum of the P term and the I term, wherein the feedback control system comprises a controller programmed to:
restrict a magnitude of the PI term using a first guard; calculate, as a corrected previous value of the I term, a value obtained by subtracting a difference between a value of the PI term prior to restriction by the first guard and a value of the PI term following restriction by the first guard, from a value of the I term; update the value of the I term by adding an update amount calculated from the deviation to the corrected previous value; store a learned term; calculate a sum of the PI term following restriction by the first guard and the learned term, as a total correction term used to calculate the correction amount; update a value of the learned term on the basis of the value of the PI term following restriction by the first guard; restrict a magnitude of the total correction term using a second guard; and correct the corrected previous value of the I term by subtracting a difference between a value of the total correction term prior to restriction by the second guard and a value of the total correction term following restriction by the second guard, wherein
the controller controls one of a fuel injector and an air flow regulator in accordance with the correction amount. |
地址 |
Toyota-Shi JP |