# US 9,752,528 B2 · Method for operating an internal combustion engine

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- Number: US 9,752,528 B2
- Document ID: US9752528B2
- Status: Granted
- Kind: B2
- Application number: 14/758,732
- Filed: 2013-12-19
- Published: 2015-12-24
- Granted: 2017-09-05
- Earliest claimed: 2013-01-02
- Assignees: MTU Friedrichshafen GmbH
- Applicants: MTU Friedrichshafen GmbH
- Inventors: Armin Dölker
- Web page: https://patentgrep.com/patent/US9752528B2

## CPC

- F02D 41/3005: {Details not otherwise provided for}
- F02D 41/021: {Introducing corrections for particular conditions exterior to the engine (conjoint control of vehicle sub-units for propelling the vehicle B60W30/18)}
- F02D 41/045: {Detection of accelerating or decelerating state (detection thereof in general G01P)}
- F02D 41/401: {Controlling injection timing (F02D41/402 takes precedence)}
- F02D 2041/1422: {Variable gain or coefficients}
- F02D 2041/1432: {the system including a filter, e.g. a low pass or high pass filter}
- Y02T 10/40: Engine management systems
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method and an arrangement for operating an internal combustion engine. In the method, an injection start is calculated by a filter, starting from a standard injection start and at least one of the filter parameters is selected in accordance with the operating mode of the internal combustion engine.

## Claims

### Claim 1

A method for operating an internal combustion engine, comprising the steps of: determining an injection start using a first filter and a second filter, starting from a standard injection start; and selecting at least one filter parameter as a function of an operating state of the internal combustion engine, wherein a filter parameter of the second filter depends on a gradient of an injection start.

### Claim 2 (depends on 1)

The method as claimed in claim 1, including calculating the filter parameter for the first filter as a function of a transient air mass ratio, which is calculated from an actual air mass ratio and a filtered air mass ratio, wherein the air mass ratio is calculated as a function of the current air mass to the standard air mass.

### Claim 3 (depends on 2)

The method as claimed in claim 2, including setting the filter parameter so that a delay behavior occurs for a transient operating mode.

### Claim 4 (depends on 2)

The method as claimed in claim 2, including setting the filter parameter so that a strong delay behavior occurs for a steady-state operating mode.

### Claim 5 (depends on 2)

The method as claimed in claim 2, including using a filter time constant as the filter parameter for the first filter.

### Claim 6 (depends on 5)

The method as claimed in claim 5, including using a filter angle as the filter parameter for the first filter.

### Claim 7 (depends on 1)

The method as claimed in claim 1, including using a filter time constant as the filter parameter for the second filter.

### Claim 8 (depends on 1)

The method as claimed in claim 1, including using a filter angle as the filter parameter for the second filter.