Method for the recognition of idling in connection with a load-shifting device of an internal combustion engine controlled by throttle valve

US5501193A · kind A · utility

Assignee

• VDO Adolf Schindling AG · DE

Inventors

• Erwin Schneider · Fulda, DE
• Frank Go/ hring · Frankfurt, DE

Key dates

• Filing date: Oct 14, 1994
• Grant date: Mar 26, 1996
• Expiry date: Oct 14, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D18/008
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for recognizing idling in a load-shifting device of an internal combustion engine controlled by throttle valve, in which the position of a setting element on the throttle-valve side is monitored by a first potentiometer and the position of a setting element on the setting-drive side is monitored by a second potentiometer. In order to be able to dispense with a separate idle contact associated with the setting element on the accelerator-pedal side for detecting the driver's wish for "idling", use is made of potentiometers having linear characteristic curves, and comparing the ratio of the characteristic curves with the actual characteristic curve ratio resulting in operation for differences. A second solution proposes adjusting the two potentiometers to the same slope by balancing at two points each, continuously detecting the voltage shifts of the two potentiometers and recognizing idling if, with a given voltage shift of the one potentiometer, a voltage shift which is predetermined on basis of the microlinearity properties of the potentiometers occurs on the other potentiometer.