Method for adjusting the fuel injection quantity of an internal combustion engine for regulating smooth operation

• US 5,906,187 A
• Filed: 06/04/1998
• Issued: 05/25/1999
• Est. Priority Date: 06/14/1997
• Status: Expired due to Term

• Current Assignee: Volkswagen AG
• Original Assignee: Volkswagen AG
• Inventors: Heuer, Karsten
• Primary Examiner(s): Solis, Erick R.
• Application Number:
  US09/090,758
• Time in Patent Office: 355 Days
• Field of Search: 123/434, 123/436, 123/435
• US Class Current: 123/436
• CPC Class Codes: F02D 2200/1015 Engines misfires
• CPC Class Codes: F02D 41/0085 Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio
• CPC Class Codes: F02D 41/1498 measuring engine roughness

Abstract

In the embodiment described in the specification, the fuel injection quantity for an internal combustion engine is adjusted for regulating smooth operation by recording a number of uneven operation fuel injection values for each individual cylinder during an observation interval, sorting the recorded uneven operation values individually for each cylinder operation according to their sign and magnitude, determining, individually for each cylinder, whether the median uneven operation value is lower than, equal to, or higher than zero, and increasing the injection quantity if the median uneven operation value is lower than zero, or reducing the fuel injection quantity if the median uneven operation value is higher than zero.

Claims

1. A method for adjusting the injection quantity of fuel in an internal combustion engine for regulating smooth operation comprising the following method steps:

(a) for each individual engine cylinder, recording a number of uneven operation smoothness values from the cylinder during an observation interval;

(b) sorting the recorded uneven operation smoothness values individually for each cylinder according to their recorded magnitude;

(c) determining, individually for each cylinder, whether the median uneven operation smoothness value according to the sorting is lower than, equal to, or higher than zero; and

(d) increasing the fuel injection quantity individually for each cylinder if the median uneven operation smoothness value is lower than zero, or reducing the fuel injection quantity if the median uneven operation value is higher than zero.

2. A method according to claim 1 wherein the fuel injection quantity is increased or reduced in fixed adjustable units.

3. A method according to claim 1 wherein at least five uneven running operation values are recorded during the observation interval.

4. A method according to claim 1 wherein the fuel injection quantity is adjusted by varying the fuel injection time.