Method for operating an internal combustion engine comprising an exhaust gas purification system

• US 20070150154A1
• Filed: 08/11/2004
• Published: 06/28/2007
• Est. Priority Date: 08/22/2003
• Status: Active Grant

• Current Assignee: Daimler AG (Mercedes-Benz Group AG)
• Original Assignee: Daimler Chrysler Company LLC (Stellantis NV)
• Inventors: Lenz, Michael
• Granted Patent: US 7,418,334 B2
• Time in Patent Office: Days
• US Class Current: 701/54
• CPC Class Codes: F02D 41/0005 during deceleration
• CPC Class Codes: F02D 41/0225 in relation with the gear ratio or shift lever position
• CPC Class Codes: F02D 41/0245 by increasing temperature of the exhaust gas leaving the engine
• CPC Class Codes: F02D 41/045 Detection of accelerating or decelerating state detection thereof in general G01P
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for operating an internal combustion engine having an exhaust gas purification system. Intake air throttling is carried out in order to raise an exhaust gas temperature in a low-load mode and in a traction mode. The amount of intake air throttling is determined as function of an expected load demand so that, with an expected unchanged or decreasing load demand, an increased or maximum possible intake air throttling is set. With an expected rising load demand, however, no or reduced intake air throttling is set, and the expected load demand is estimated based on operating and ambient parameters of the internal combustion engine.

Claims

1-6. -6. (canceled)

7. A method for operating an internal combustion engine having an exhaust gas purification system, comprising carrying out intake air throttling to raise an exhaust gas temperature in a low-load mode and in a traction mode, determining an amount of intake air throttling as a function of an expected load demand so that, with an expected unchanged or decreasing load demand, an increased or maximum possible intake air throttling is set, and, with an expected rising load demand, no or a reduced intake air throttling is set, wherein the expected load demand is estimated based on operating and ambient parameters of the internal combustion engine.

8. The method as claimed in claim 7, wherein the internal combustion engine is a motor vehicle engine, and the expected load demand is estimated as a function of at least one of a brake pedal position, a brake pressure, a profile of the brake pedal position and a brake pressure profile.

9. The method as claimed in claim 7, wherein the internal combustion engine is a motor vehicle engine, and the expected load demand is estimated as a function of a transmission position.

10. The method as claimed in claim 9, wherein the estimated expected load demand is linked to current driving speed.

11. The method as claimed in claim 7, wherein the internal combustion engine is a motor vehicle engine, and the expected load demand is estimated as a function of a measurement of the distance from a vehicle traveling ahead.

12. The method as claimed in claim 7, wherein the internal combustion engine is a motor vehicle engine, and the expected load demand is estimated as a function of information on at least one of position and location of the vehicle.

13. The method as claimed in claim 7, wherein the internal combustion engine is a motor vehicle engine, and the expected load demand is estimated as a function of acceleration spin information.