INTERNAL COMBUSTION ENGINE

• US 20150167578A1
• Filed: 12/08/2014
• Published: 06/18/2015
• Est. Priority Date: 12/13/2013
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Hotta, Shintaro
• Granted Patent: US 9,695,771 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F02B 2023/106 Tumble flow, i.e. the axis of rotation of the main charge flow motion is horizontal
• CPC Class Codes: F02B 2275/48 Tumble motion in gas movement in cylinder
• CPC Class Codes: F02B 23/104 the injector being placed on a side position of the cylinder
• CPC Class Codes: F02B 29/0406 Layout of the intake air cooling or coolant circuit
• 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 13/0207 changing valve lift or valve lift and timing
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 2041/0015 for engines with means for controlling swirl or tumble flow, e.g. by using swirl valves
• 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 41/3035 a mode being the premixed charge compression-ignition mode
• CPC Class Codes: F02D 41/3064 with special control during transition between modes
• CPC Class Codes: F02D 41/3094 the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
• CPC Class Codes: F02M 35/10177 Engines having multiple fuel injectors or carburettors per cylinder
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An engine control device controls control amounts of a variable valve mechanism and a spark plug, the control amounts in a homogeneous lean operation region set in a first load region are different from that in a non-lean operation region which is a stoichiometric or rich operation region set in a second load region higher than the first load region. The control device performs control, in other operation region set in a third load region between the first and second load region, so that an air-fuel ratio of the internal combustion engine is equal to that of non-lean operation region, the control amount of the variable valve mechanism is equal to that of homogeneous lean operation region and the control amount of the spark plug is equal to that of the non-lean operation region in accordance with an operation amount of an accelerator pedal.

Claims

1. An internal combustion engine comprising:

a variable valve mechanism;

a spark plug; and

a control device,

the control device controls a first control amount of the variable valve mechanism and a second control amount of the spark plug, the first control amount and the second control amount in a homogeneous lean operation region are different from the first control amount and the second control amount in a non-lean operation region, the homogeneous lean operation region is set in a first load region, the non-lean operation region is a stoichiometric or rich operation region set in a second load region, the second load region is higher than the first load region,

the control device performs control, in other operation region set in a third load region, so that an air-fuel ratio of the internal combustion engine is equal to an air-fuel ratio of non-lean operation region, the first control amount of the variable valve mechanism is equal to a control amount of the homogeneous lean operation region and the second control amount of the spark plug is equal to a control amount of the non-lean operation region in accordance with an operation amount of an accelerator pedal, the third load region is determined between the first load region and the second load region.

2. The internal combustion engine according to claim 1, further comprising a port injection valve and an in-cylinder injection valve, wherein

the control device controls an injection sharing ratio and a fuel pressure, at least one of the injection sharing ratio and the fuel pressure in the homogeneous lean operation region is different from the at least one in the non-lean operation region, and

the control device performs control, in the other operation region set in the third load region, so that the at least one is equal to a value for the homogeneous lean operation region in accordance with the operation amount of the accelerator pedal.

3. The internal combustion engine according to claim 1, further comprising a waste gate valve, wherein

the control device controls the waste gate valve so that in the homogeneous lean operation the waste gate valve is closed or a degree of opening of the waste gate valve is equal to a predetermined opening degree, the degree of opening of the waste gate valve in the non-lean operation region is greater than a control amount of the waste gate valve for the homogeneous lean operation, and

the control device performs control, in the other operation region set in the third load region, so that the degree of opening of the waste gate valve is equal to a value for the homogeneous lean operation region.

4. The internal combustion engine according to claim 1, further comprising a tumble control valve, wherein

the control device controls the tumble control valve so that in the homogeneous lean operation the tumble control valve is closed or a degree of opening of the tumble control valve is equal to a predetermined opening degree, the degree of opening of the tumble control valve in the non-lean operation region is greater than a control amount of the tumble control valve for the homogeneous lean operation, and

the control device performs control, in the other operation region set in the third load region, so that the degree of opening of the tumble control valve is equal to a value for the homogeneous lean operation region.

5. An internal combustion engine comprising:

a variable valve mechanism;

a spark plug; and

a control device,

the control device controls a first control amount of the variable valve mechanism and a second control amount of the spark plug, the first control amount and the second control amount in a homogeneous lean operation region are different from the first control amount and the second control amount in a non-lean operation region, the homogeneous lean operation region is set in a first load region, the non-lean operation region is a stoichiometric or rich operation region set in a second load region, the second load region is higher than the first load region, and

the control device performs control, when a rich-spike is executed, so that the first control amount of the variable valve mechanism is equal to a control amount of homogeneous lean operation region and the second control amount of the spark plug is equal to a control amount of the non-lean operation region, the rich-spike is a temporal stoichiometric or rich operation in the homogeneous lean operation.

6. The internal combustion engine according to claim 5, further comprising a port injection valve and an in-cylinder injection valve, wherein

the control device controls an injection sharing ratio and a fuel pressure, at least one of the injection sharing ratio and the fuel pressure in the homogeneous lean operation region is different from the at least one in the non-lean operation region, and

the control device performs control, when the rich-spike is executed, so that the at least one is equal to a value for the homogeneous lean operation region in accordance with an operation amount of an accelerator pedal.

7. The internal combustion engine according to claim 5, further comprising a waste gate valve, wherein

the control device controls the waste gate valve so that in the homogeneous lean operation the waste gate valve is closed or a degree of opening of the waste gate valve is equal to a predetermined opening degree, and the degree of opening of the waste gate valve in the non-lean operation region is greater than a control amount of the waste gate valve for the homogeneous lean operation, and

the control device performs control, when the rich-spike is executed, so that the degree of opening of the waste gate valve is equal to a value for the homogeneous lean operation region.

8. The internal combustion engine according to claim 5, further comprising a tumble control valve, wherein

the control device controls the tumble control valve so that in the homogeneous lean operation the tumble control valve is closed or a degree of opening of the tumble control valve is equal to a predetermined opening degree, and the degree of opening of the tumble control valve in the non-lean operation region is greater than a control amount of the tumble control valve for the homogeneous lean operation, and

the control device performs control, when the rich-spike is executed, so that the degree of opening of the tumble control valve is equal to a value for the homogeneous lean operation region.