Electronic engine control system with emergency operation mode

US4531190A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ulrich Drews · Schwieberdingen, DE
• Manfred Mezger · Markgröningen, DE
• Bernhard Schmidt · Neunkirchen, DE
• Karl Seeger · Ditzingen, DE
• Gerhard Sohner · Schorndorf, DE
• Herman Roozenbeek · Schwieberdingen, DE

Key dates

• Filing date: Feb 3, 1982
• Grant date: Jul 23, 1985
• Expiry date: Feb 3, 2002

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P11/06
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

To permit continued operation of a vehicle in spite of malfunction of an electronic ignition computer system, or any other electronic control module in an automotive vehicle, a transducer (10) provides an output to a trigger stage which has its output connected a digitally operating microprocessor (17) and to a bypass or transfer switch (21). The output from the microprocessor is connected to an analog and operating output stage (19, 20) to be controlled by the digital system of the microprocessor (17). Upon sensing of low operating voltage (U) as determined, for example, by a threshold switch (22), or of starting condition the switch (21) is closed, bypassing or interrupting connection to the microprocessor, and directly connecting signals from the transducer output stage to the input of the ignition circuit to permit operation under emergency conditions. The analog portion of the system is a single integrated module, separate from the digitally operating microprocessor (17) for ease of error diagnosis, maintenance and repair. This is particularly important with digitally operating control systems (17) which are subject to malfunction under low voltage conditions or upon occurrenc…