Engine knock control method and system with fail-safe mode

US4700677A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Jorg Bonitz · Mühlacker, DE
• Robert Entenmann · Memmingen, DE
• Bernhard Miller · Weil der Stadt, DE
• Hans Rauch · West Palm Beach, US
• Siegfried Rohde · Schwieberdingen, DE
• Stefan Unland · Schwieberdingen, DE
• Walter Viess · Schwieberdingen, DE

Key dates

• Filing date: Feb 17, 1987
• Grant date: Oct 20, 1987
• Expiry date: Feb 17, 2007

Classification

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

Abstract

To provide for adaptive change of the operating characteristics of an engine, so that it will operate at its optimum effectiveness, just below the knocking limit, while reliably preventing knocking thereof, a computer receives engine data from respective sensors and a knock sensor (5), from which the computer calculates, based on data stored in a memory (3), operating parameters for the engine (1). The engine is, for example, an Otto-type internal combustion engine (ICE) or a Diesel engine. The operating characteristics, as computer-modified based on sensed knocking, and the modification data, are then placed into the memory to modify the basic memory content. Preferably, the memory has a basic memory content section and a programmable differential or modification section, in which algebraic constants or modifying factors are stored, based on actual experience of operation of the engine, just under the knocking limit. Thus, the stored data on which the engine operation is controlled is continuously up-dated based on actual engine operating conditions, and thereby compensating for ageing, wear and tear of parts, different fuels, or environmental conditions or the like. The computer …