Method and device for the open-loop control of an internal-combustion engine

US5575257A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Joerg Lange · Eberdingen, DE
• Heinz Stutzenberger · Leinfelden, DE
• Thomas Lehmann · Hamburg, DE
• Christian Koehler · Dresden, DE

Key dates

• Filing date: Dec 19, 1994
• Grant date: Nov 19, 1996
• Expiry date: Dec 19, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a method and device for the open-loop control of an internal-combustion engine, the change in the torque caused by an influencing of the ignition angle is compensated for by a correspondingly adjusted influencing of the air inducted by the internal-combustion engine. Thus, the accelerator-pedal characteristic is hardly influenced in the case of a change in the ignition angle. The method and device can be used, for example, to accelerate the heating up of a catalytic converter after start-up of the internal-combustion engine. To reinforce the heating operation and to reduce emission, an intervention in the air/fuel ratio can be made at the same time, and a switching signal can be produced, for example, for a secondary air pump. The air inducted by the internal-combustion engine is generally influenced by an idle-speed actuator, which is arranged in a by-pass duct leading to the throttle valve. In the case of internal-combustion engines having an electronically controlled throttle valve, in place of the idle-speed actuator, the throttle valve can also be influenced accordingly. Weighting factors which depend on the operating state of the internal-combustion engine, are used to wei…