# US 2013/0152884 A1 · Exhaust valve control system

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- Number: US 2013/0152884 A1
- Document ID: US20130152884A1
- Status: Published application
- Kind: A1
- Application number: 13/543,323
- Filed: 2012-07-06
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: Hyundai Motor Company
- Inventors: Byounghyouk MIN; Ho Chul Kwak
- Web page: https://patentgrep.com/patent/US20130152884A1

## CPC

- F02D 13/0249: {changing the valve timing only}
- F01L 1/04: by means of cams, camshafts, cam discs, eccentrics or the like (F01L1/10 takes precedence)
- F01L 1/047: Camshafts
- F01L 1/08: Shape of cams
- F01L 2001/0537: {Double overhead camshafts [DOHC]}
- F01L 2820/00: Details on specific features characterising valve gear arrangements
- Y02T 10/12: Improving ICE efficiencies
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An exhaust valve control system of an engine includes a first bank including a plurality of cylinders and a second bank including a plurality of cylinder, in which the angle between the exhaust cam profiles of any two cylinders in the first bank is different by a predetermined angle or more from 180°, and the angle between the exhaust cam profiles of any two cylinders in the second bank is different by a predetermined angle or more from 180°.

## Claims

### Claim 1

An exhaust valve control system of an engine comprising a plurality of cylinders divided into a first bank and a second bank,
wherein the angle between respective exhaust cam profiles of any two cylinders in the first bank differs by a predetermined angle or more from 180°, and
wherein the angle between respective exhaust cam profiles of any two cylinders in the second bank differs by a predetermined angle or more from 180°.

### Claim 2 (depends on 1)

The system of claim 1, wherein:
profiles and lifts of exhaust cams of the plurality of cylinders in the first bank are the same.

### Claim 3 (depends on 1)

The system of claim 1, wherein:
profiles and lifts of exhaust cams of the plurality of cylinders in the second bank are the same.

### Claim 4 (depends on 1)

The system of claim 1, wherein:
the engine is an 8-cylinder engine in which the first bank includes first, third, fifth, and seventh cylinders sequentially from a front of the engine, and the second bank includes second, fourth, sixth, and eighth cylinders sequentially from the front of the engine,
the angle between the exhaust cam profiles of the first cylinder and the seventh cylinder in the first bank is different by a first predetermined angle and a second predetermined angle or more from 180°, and
when the exhaust cam profile of the first cylinder is retarded by the first predetermined angle, and
the exhaust cam profile of the seventh cylinder is advanced by the second predetermined angle, the angle between the profiles is 180°.

### Claim 5 (depends on 1)

The system of claim 1, wherein:
the engine is an 8-cylinder engine in which the first bank includes first, third, fifth, and seventh cylinders sequentially from the front of the engine and the second bank includes second, fourth, sixth, and eighth cylinders sequentially from the front of the engine,
the angle between the exhaust cam profiles of the fifth cylinder and the third cylinder in the first bank is different by a first predetermined angle and a second predetermined angle or more from 180°, and
when the exhaust cam profile of the fifth cylinder is retarded by the first predetermined angle and
the exhaust cam profile of the third cylinder is advanced by the second predetermined angle, the angle between the profiles is 180°.

### Claim 6 (depends on 1)

The system of claim 1, wherein:
wherein the engine is an 8-cylinder engine in which the first bank includes first, third, fifth, and seventh cylinders sequentially from the front of the engine and the second bank includes second, fourth, sixth, and eighth cylinders sequentially from the front of the engine,
the angle between the exhaust cam profiles of the second cylinder and the eighth cylinder in the second bank is different by a first predetermined angle and a second predetermined angle or more from 180°, and
when the exhaust cam profile of the second cylinder is retarded by the first predetermined angle and
the exhaust cam profile of the eighth cylinder is retarded by the second predetermined angle, the angle between the profiles is 180°.

### Claim 7 (depends on 1)

The system of claim 1, wherein:
wherein the engine is an 8-cylinder engine in which the first bank includes first, third, fifth, and seventh cylinders sequentially from the front of the engine and the second bank includes second, fourth, sixth, and eighth cylinders sequentially from the front of the engine,
the angle between the exhaust cam profiles of the fourth cylinder and the sixth cylinder in the second bank is different by a first predetermined angle and a second predetermined angle or more from 180°, and
when the exhaust cam profile of the fourth cylinder is retarded by the first predetermined angle and
the exhaust cam profile of the sixth cylinder is advanced by the second predetermined angle, the angle between the profiles is 180°.