Method for detecting an extreme value position of a movable part

Details Method for detecting an extreme value position of a movable part Method for detecting an extreme value position of a movable part

1985-12-13

1988-02-02

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Fuel injection system

731181, F02B 300

Patent

active

047223138

ABSTRACT:
A method is disclosed for detecting an extreme value position of a movable part by means of a position detecting sensor. The method is especially suitable for detecting the idle position of the throttle flap of an internal combustion engine with the aid of a potentiometer. In this method, a stored value (extreme value) corresponding to the extreme position is corrected upon the detection of deviating measured values, provided that the deviating measured values lie within a correction range around the extreme value. The range of movement of the movable part has to lie within the range coverable by the position sensor. After a predetermined number of identical measured values are sensed in the correction range during an operating cycle, such a measured value is stored in memory as the new extreme value. For dynamic adaptation, this next extreme value is modified cyclically, preferably prior to each operating cycle, by a predetermined value away from the outermost position. While detecting the extreme position with a high accuracy, the method of the invention has a very small hysteresis, with the full function capability being restored after a short period, even under irregular operating conditions.

REFERENCES:
patent: 4409948 (1983-10-01), Hasegawa
patent: 4586403 (1986-05-01), Lee

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