INTERNAL COMBUSTION ENGINE CONTROL METHOD AND INTERNAL COMBUSTION ENGINE CONTROL DEVICE

• US 20200131980A1
• Filed: 04/19/2017
• Published: 04/30/2020
• Est. Priority Date: 04/19/2017
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: KIMURA, Yoshiyasu
• Granted Patent: US 10,697,360 B2
• Time in Patent Office: Days
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 37/183 Arrangements of bypass valves or actuators therefor
• CPC Class Codes: F02B 37/24 by using pumps or turbines with adjustable guide vanes
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02M 26/06 Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An internal combustion engine includes: a turbocharger including a compressor and an exhaust turbine; a wastegate valve for allowing a part of exhaust gas to bypass the exhaust turbine and flow into a downstream side of the exhaust turbine, wherein the exhaust gas is to be brought into the exhaust turbine; and an exhaust adjustment mechanism for adjusting a quantity of the exhaust gas. A control method includes operating a first one of the wastegate valve and the exhaust adjustment mechanism with higher priority to a second one of the wastegate valve and the exhaust adjustment mechanism in response to a condition where an intake air quantity is to be varied along with a variation in engine load or air fuel ratio, wherein operation of the first one allows thermal energy to be recovered more efficiently under the condition than that of the second one.

Claims

1. An internal combustion engine control method for an internal combustion engine,

the internal combustion engine including:

a turbocharger including;

a compressor disposed in an intake passage; and

an exhaust turbine disposed in an exhaust passage;

a wastegate valve structured to allow a part of exhaust gas to bypass the exhaust turbine and flow into a downstream side of the exhaust turbine, wherein the exhaust gas is to be brought into the exhaust turbine; and

an exhaust adjustment mechanism structured to adjust a quantity of the exhaust gas;

the internal combustion engine control method comprising;

operating a first one of the wastegate valve and the exhaust adjustment mechanism with higher priority to a second one of the wastegate valve and the exhaust adjustment mechanism in response to a condition where an intake air quantity is to be varied along with a variation in engine load or air fuel ratio, wherein operation of the first one allows thermal energy to be recovered more efficiently under the condition than that of the second one.

2. The internal combustion engine control method as claimed in claim 1, comprising:

performing a valve opening reducing operation of the wastegate valve with higher priority to operation of the exhaust adjustment mechanism, in response to a condition where the intake air quantity is to be increased along with an increase in engine load.

3. The internal combustion engine control method as claimed in claim 2, comprising:

starting to perform an opening reducing operation of the exhaust adjustment mechanism after the wastegate valve is brought into fully-closed state in response to a condition where the intake air quantity is to be increased along with an increase in engine load.

4. The internal combustion engine control method as claimed in claim 1, comprising:

performing an opening increasing operation of the exhaust adjustment mechanism with higher priority to operation of the wastegate valve, in response to a condition where the intake air quantity is to be reduced along with a decrease in engine load.

5. The internal combustion engine control method as claimed in claim 4, comprising:

starting to perform a valve opening increasing operation of the wastegate valve after the exhaust adjustment mechanism is brought into fully-opened state in response to a condition where the intake air quantity is to be reduced along with a decrease in engine load.

6. The internal combustion engine control method as claimed in claim 1, comprising:

performing a valve opening reducing operation of the wastegate valve with higher priority to operation of the exhaust adjustment mechanism, in response to a condition where the intake air quantity is to be increased so as to set an air fuel ratio learner.

7. The internal combustion engine control method as claimed in claim 6, comprising:

starting to perform an opening reducing operation of the exhaust adjustment mechanism after the wastegate valve is brought into fully-closed state in response to a condition where the intake air quantity is to be increased so as to set the air fuel ratio learner.

8. The internal combustion engine control method as claimed in claim 1, comprising:

performing an opening increasing operation of the exhaust adjustment mechanism with higher priority to operation of the wastegate valve, in response to a condition where the intake air quantity is to be reduced so as to set an air fuel ratio richer.

9. The internal combustion engine control method as claimed in claim 8, comprising:

starting to perform a valve opening increasing operation of the wastegate valve after the exhaust adjustment mechanism is brought into fully-opened state in response to a condition where the intake air quantity is to be increased so as to set the air fuel ratio richer.

10. An internal combustion engine control device for an internal combustion engine,

the internal combustion engine including:

a turbocharger including;

a compressor disposed in an intake passage; and

an exhaust turbine disposed in an exhaust passage;

a wastegate valve structured to allow a part of exhaust gas to bypass the exhaust turbine and flow into a downstream side of the exhaust turbine, wherein the exhaust gas is to be brought into the exhaust turbine; and

an exhaust adjustment mechanism structured to adjust a quantity of the exhaust gas;

the internal combustion engine control device comprising;

a control section configured to operate a first one of the wastegate valve and the exhaust adjustment mechanism with higher priority to a second one of the wastegate valve and the exhaust adjustment mechanism in response to a condition where an intake air quantity is to be varied along with a variation in engine load or air fuel ratio, wherein operation of the first one allows thermal energy to be recovered more efficiently under the condition than that of the second one.