Patent ID: 6334094
Filing Date: 2001-12-25
Classification: F02D,G01P

Abstract:
An engine speed calculation apparatus for measuring a time required for rotation over a predetermined angle each time a crankshaft of an engine rotates over the predetermined angle and calculates an engine speed in accordance with the required time comprising:a discrimination means for determining if the calculated engine speed is lower than a predetermined speed; anda calculation means for dividing, when the engine speed calculated in the preceding cycle is lower than the predetermined speed, a predetermined value, by a time required for rotation over an angle equal to a plurality of times of the predetermined angle to calculate the engine speed, but dividing, when the engine speed calculated in the preceding cycle is equal to or higher than the predetermined speed, the predetermined value, by a value equal to a plurality of times of the time required for rotation over the predetermined angle to calculate the engine speed.