Control device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016201589-A1
Application number	US-201614991118-A
Country	US
Kind code	A1
Filing date	Jan 8, 2016
Priority date	Jan 14, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

A control device for an internal combustion engine includes an electronic control unit configured to switch a control algorithms for a calculation of a command value of the actuator between a first control algorithm and a second control algorithm. The electronic control unit is configured to calculate a value obtained by adding a value of a term of the second control algorithm changing in accordance with the deviation calculated in a present control cycle to the command value calculated in a previous control cycle in accordance with the first control algorithm as a value of the command value calculated in the present control cycle in a first control cycle after switching from the first control algorithm to the second control algorithm. The value of the term changing in accordance with the deviation includes an update amount of an I term of the I control calculated in the present control cycle.

First claim

1 . A control device for an internal combustion engine, the internal combustion engine including an actuator, the control device comprising:
an electronic control unit configured to calculate a command value given to the actuator at a predetermined control cycle in accordance with a first control algorithm, wherein the electronic control unit is configured to calculate the command value given to the actuator at the control cycle in accordance with a second control algorithm differing from the first control algorithm, the second control algorithm including a feedback control including an I control and being in accordance with a deviation between a target value and a current value, wherein the electronic control unit is configured to switch the control algorithms for the calculation of the command value of the actuator between the first control algorithm and the second control algorithm, and wherein the electronic control unit is configured to calculate a value obtained by adding a value of a term of the second control algorithm changing in accordance with the deviation calculated in a present control cycle to the command value calculated in a previous control cycle in accordance with the first control algorithm as a value of the command value calculated in the present control cycle in a first control cycle after switching from the first control algorithm to the second control algorithm, the value of the term changing in accordance with the deviation calculated in the present control cycle including an update amount of an I term of the I control calculated in the present control cycle.

2 . The control device according to claim 1 ,
wherein the second control algorithm includes a feedforward control, and wherein the electronic control unit is configured to calculate a value obtained by subtracting a current value of a feedforward term of the feedforward control from the command value calculated in the previous control cycle in accordance with the first control algorithm as a previous value of the I term of the I control and as the value of the command value calculated in the present control cycle in the first control cycle after the switching from the first control algorithm to the second control algorithm.

3 . The control device according to claim 1 ,
wherein the feedback control includes a P control, and wherein the term changing in accordance with the deviation includes a P term of the P control.

4 . The control device according to claim 1 ,
wherein the feedback control includes a D control, and wherein the term changing in accordance with the deviation includes a D term of the D control.

5 . The control device according to claim 1 ,
wherein the internal combustion engine is a compression ignition-type internal combustion engine, wherein the actuator is a throttle placed in an intake passage of the internal combustion engine, wherein the first control algorithm is a control algorithm for calculating the command value given to the throttle such that an anterior/posterior differential pressure of the throttle corresponds to a target differential pressure, and wherein the second control algorithm is a control algorithm for calculating the command value given to the throttle such that an amount of fresh air passing through the throttle corresponds to a target fresh air amount.

6 . The control device according to claim 1 ,
wherein the internal combustion engine is a turbocharger-attached internal combustion engine, wherein the actuator is an actuator controlling a flow rate of exhaust gas flowing into a turbine of the turbocharger, wherein the first control algorithm is a control algorithm for calculating the command value given to the actuator such that any one control amount selected among an intake manifold pressure, an exhaust manifold pressure, a throttle upstream pressure, and a turbo efficiency corresponds to a target value of the control amount, and wherein the second control algorithm is a control algorithm for calculating the command value given to the actuator such that any one control amount selected among the intake manifold pressure, the exhaust manifold pressure, the throttle upstream pressure, and the turbo efficiency and differing from the control amount of the first control algorithm corresponds to a target value of the control amount.

Assignees

• Toyota Motor Co Ltd

Inventors

• Aoyagi Shinsuke

Classifications

• F02D41/0007

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title

• F02D2041/0017

  by simultaneous control of throttle and exhaust gas recirculation · CPC title

• F02D41/0077

  Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position (EGR valve position sensor F02M26/48) · CPC title

• F02D41/1477 Primary

  characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output) · CPC title

• F02D41/26

  using computer, e.g. microprocessor · CPC title