OPERATING PROCESS FOR A LEAN-BURN GAS ENGINE, AND LEAN-BURN GAS ENGINE

• US 20150308400A1
• Filed: 04/24/2015
• Published: 10/29/2015
• Est. Priority Date: 04/25/2014
• Status: Abandoned Application

• Current Assignee: MTU Friedrichshafen GmbH (Rolls-Royce Holdings Plc)
• Original Assignee: MTU Friedrichshafen GmbH (Rolls-Royce Holdings Plc)
• Inventors: Toth, Aron, Bernhard, Alexander, Fimml, Wolfgang
• Application Number:
  US14/695,816
• Publication Number:
  US 20150308400A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F02D 19/024 by controlling fuel injectors
• CPC Class Codes: F02D 35/023 by determining the cylinder pressure
• CPC Class Codes: F02D 35/028 by determining the combustion timing or phasing
• CPC Class Codes: F02D 41/0027 the fuel being gaseous non-electrical control F02D19/02
• CPC Class Codes: F02D 41/008 Controlling each cylinder individually
• CPC Class Codes: F02D 41/0085 Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio
• CPC Class Codes: F02P 5/145 using electrical means
• CPC Class Codes: F02P 5/1512 with particular means concerning an individual cylinder
• CPC Class Codes: F02P 5/153 dependent on combustion pressure
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

The invention relates to an operating process for a lean-burn gas engine having several cylinders, wherein the lean-burn gas engine includes a cylinder-individual gas metering arrangement and a cylinder-individual combustion process capture. The lean-burn gas engine is controlled by a control unit in such a manner that a combustion duration of the individual cylinders is regulated by a control unit, by way of a change of ignition timing of the individual cylinders. The control unit regulates the ignition timing of the individual cylinders in such a way that all cylinders are equalized in regard to their turnover point, so that a defined turnover point is achieved at a defined crank shaft angle.

Claims

1. An operating process for a lean-burn gas engine having several cylinders, comprising the steps of:

providing a cylinder-individual gas metering arrangement;

capturing a cylinder-individual combustion process;

controlling the lean-burn gas engine using at least one control unit;

regulating a combustion duration of individual cylinders using said at least one control unit, by way of a change of an ignition timing of said individual cylinders; and

regulating said ignition timing of said individual cylinders using said at least one control unit in such a way that all said individual cylinders are equalized in regard to a turnover point of each cylinder, so that a defined turnover point for each said cylinder is achieved at a defined crank shaft angle.

2. The operating process for a lean-burn gas engine having several cylinders of claim 1, further comprising the steps of:

performing cylinder-individual pressure measurements for said capture of said cylinder-individual combustion process; and

conducting on the basis of said cylinder-individual pressure measurements a cylinder-individual pressure progression analysis using said at least one control unit.

3. The operating process for a lean-burn gas engine having several cylinders of claim 1, wherein:

said turnover point is defined as a turnover point between a 5% to 15% turnover point and said crank shaft angle which is present in the defined turnover point is defined as a crank shaft angle being between −

5° and

0°

.

4. The operating process for a lean-burn gas engine having several cylinders of claim 3, wherein:

said turnover point is defined as a turnover point between a 8% and 12% turnover point and said crank shaft angle which is present in the defined turnover point is defined as a crank shaft angle being of approximately −

2°

.

5. The operating process for a lean-burn gas engine having several cylinders of claim 1, further comprising the steps of:

providing one control unit for each cylinder;

providing at least one pressure sensor for each cylinder; and

providing at least one ignition unit for each cylinder.

6. The operating process for a lean-burn gas engine having several cylinders of claim 1, wherein:

said at least one control unit comprises an electronic system;

said electronic system calculating at least one cylinder-individual pressure progression from measured signals of at least one pressure sensor and therefrom calculating at least one cylinder-individual control signal to adapt a combustion duration for at least one cylinder-individual ignition device, said electronic system issuing said at least one cylinder-individual control signal to said at least one cylinder-individual ignition device; and

said at least one cylinder-individual control signal for said at least one cylinder-individual ignition device determining a cylinder-individual ignition timing point.

7. The operating process for a lean-burn gas engine according to claim 6, further comprising the steps of:

providing at least one gas metering device for each cylinder; and

providing at least one emission detection device.