Control system for supercharged internal combustion engine

• US 7,614,229 B2
• Filed: 05/19/2006
• Issued: 11/10/2009
• Est. Priority Date: 05/20/2005
• Status: Active Grant

• Current Assignee: DENSO Corporation, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation), Volkswagen AG
• Original Assignee: DENSO Corporation, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Tanaka, Toshihiko, Irisawa, Yasuyuki, Kubota, Hirofumi
• Primary Examiner(s): Nguyen; Hoang M
• Application Number:
  US11/666,441
• Publication Number:
  US 20080022678A1
• Time in Patent Office: 1,271 Days
• Field of Search: 606/02, 606/051
• US Class Current: 60/602
• CPC Class Codes: F01N 13/009 having two or more separate purifying devices arranged in series
• CPC Class Codes: F01N 13/0093 the purifying devices are of the same type
• CPC Class Codes: F01N 2430/08 by modifying ignition or injection timing
• CPC Class Codes: F01N 3/101 Three-way catalysts
• CPC Class Codes: F01N 3/2006 Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating by electrically controlling the supply of combustible mixture or its constituents only F02D41/0235
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• 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: F02D 41/0255 to accelerate the warming-up of the exhaust gas treating apparatus at engine start
• CPC Class Codes: F02P 5/1506 with particular means during starting
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A control system for a supercharged internal combustion engine provided with a main exhaust passage (20) extending through a turbocharger turbine (21) and further through a catalyst (23, 24) to open to the outside air, an exhaust bypass passage (25) by passing the turbocharger turbine by branching from the main exhaust passage at the upstream side of the turbine and merging with the main exhaust passage before reaching the catalyst at the turbine downstream side, and an exhaust bypass valve (26) provided at the exhaust bypass passage, the control system for a supercharged internal combustion engine controlling the ignition timing in accordance with at least one of the engine warmup state and the catalyst warmup state until warmup of the internal combustion engine and warmup of the catalyst are completed and further controlling the opening degree of the exhaust bypass valve based on the control of the ignition timing, is provided.

Claims

1. A control system for a supercharged internal combustion engine, the control system comprising:

a main exhaust passage that extends from an exhaust port of the internal combustion engine through a turbocharger turbine and further through a catalyst,

an exhaust bypass passage that branches from the main exhaust passage at the upstream side of the turbocharger turbine, bypasses the turbocharger turbine, and merges with the main exhaust passage before the catalyst at a turbine downstream side, and

an exhaust bypass valve provided in the exhaust bypass passage,

wherein the control system controls an ignition timing in accordance with at least one of an engine warm-up state and a catalyst warm-up state, until warm-up of an internal combustion engine body and the catalyst is completed, and

wherein the control system causes the exhaust bypass valve to open to warm-up the catalyst when the ignition timing of the internal combustion engine is retarded to a timing equal to or greater than a predetermined ignition timing.

2. The control system for a supercharged internal combustion engine as set forth in claim 1, wherein from the start of the above internal combustion engine to when said internal combustion engine enters the engine warm-up state, the ignition timing is advanced more than the predetermined ignition timing.

3. The control system for a supercharged internal combustion engine as set forth in claim 1, wherein after the start of the internal combustion engine, and said internal combustion engine body is in the engine warm-up state, the ignition timing is retarded to or more than the predetermined ignition timings and the exhaust bypass valve is opened.

4. The control system for a supercharged internal combustion engine as set forth in claim 1, wherein the engine warm-up state of the internal combustion engine body is determined based on an engine intake pressure.

5. The control system for a supercharged internal combustion engine as set forth in claim 1, wherein the exhaust bypass valve is closed after an engine intake pressure is equal or less than a predetermined intake pressure.

11. The control system for a supercharged internal combustion engine as set forth in claim 1, wherein the engine warm-up state of the internal combustion engine body is determined based on a temperature of a top face of an engine piston.

6. A control system for a supercharged internal combustion engine, the control system comprising:

a main exhaust passage that extends from an exhaust port of the internal combustion engine through a turbocharger turbine and further through a catalyst,

an exhaust bypass passage that branches from the main exhaust passage at the upstream side of the turbocharger turbine, bypasses the turbocharger turbine, and merges with the main exhaust passage before the catalyst at a turbine downstream side, and

an exhaust bypass valve that opens and closes the exhaust bypass passage,

wherein the control system opens the exhaust bypass valve to warm-up the catalyst after startup of the internal combustion engine when an ignition timing of the internal combustion engine is retarded to a timing equal to or greater than a predetermined ignition timing.

7. The control system for a supercharged internal combustion engine as set forth in claim 6, wherein from the start of the above internal combustion engine to when said internal combustion engine enters an engine warm-up state, the ignition timing is advanced more than the predetermined ignition timing.

8. The control system for a supercharged internal combustion engine as set forth in claim 6, wherein after the start of the internal combustion engine, and said internal combustion engine body is in an engine warm-up state, the ignition timing is retarded to or more than the predetermined ignition timing, and the exhaust bypass valve is opened.

9. The control system for a supercharged internal combustion engine as set forth in claim 6, wherein the engine warm-up state of the internal combustion engine body is determined based on an engine intake pressure.

10. The control system for a supercharged internal combustion engine as set forth in claim 6, wherein the exhaust bypass valve is closed after an engine intake pressure is equal or less than a predetermined intake pressure.

12. The control system for a supercharged internal combustion engine as set forth in claim 6, wherein the engine warm-up state of the internal combustion engine body is determined based on a temperature of a top face of an engine piston.