Supervisory system for a vehicle accelerator pedal travel transducer

US5150681A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Hermann Kull · Stuttgart, DE
• Joachim Berger · Bad Sobernheim, DE
• Ulrich Gerstung · Lambach, DE
• Klaus Bleuel · Oestrich-Winkel, DE

Key dates

• Filing date: May 21, 1991
• Grant date: Sep 29, 1992
• Expiry date: May 21, 2011

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B1/04
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a supervisory system (FIG. 7) for the accelerator pedal transducer (26) in an electronic engine control (EMS) for a vehicle engine, the output signal (U-FFG) of the transducer (26) is interpreted to show whether or not the transducer is at or close to the idling position. The resulting information is compared with the states of idling and pressure switches (18, 28) which shows whether or not the accelerator pedal (30) is actually at or close to its idling position. A contradiction resulting from this comparison indicates a fault and remedial action can be taken by the EMS, for example, to reduce the engine power to a precautionary value. A contradiction between other comparisons shows that one of the switches (18, 28) is faulty. In the event of the accelerator pedal sticking in a depressed position after the driver has lifted his foot and depressed the brake (FIG. 5) a brake signal (BS) can be passed through a gating circuit controlled by the idling switch signal (FFG-LL) to produce a reaction signal(RS). The EMS processes the latter to reduce the engine power to a precautionary safe value.