Patent ID: 9341124
Filing Date: 2016-05-17
CPC Classification: F02D,F02N,Y02T

Claim Text:
1. An engine speed predicting system for a vehicle comprising: a first calculator which works to calculate a predicted value of speed of an engine mounted in a vehicle during forward rotation of an output shaft of the engine within one of a sequence of speed prediction periods when speed of the engine is decreasing after fuel stops being burned in the engine, each of the speed prediction periods being set within an interval between start of decreasing of the speed of the engine and a complete stop of the engine; a second calculator which works to calculate, in a manner different from the first calculator, a predicted value of the speed of the engine during reverse rotation of the output shaft of the engine within one of the speed prediction periods; and switching means for switching between the first calculator and the second calculator to select one of the first and second calculators which is to be used in calculating the predicted value of the speed of the engine depending upon whether the predicted value is during the forward rotation or during the reverse rotation of the output shaft of the engine, the first calculator being selected when the predicted value is during the forward rotation of the output shaft of the engine, the second calculator being selected when the predicted value is during the reverse rotation of the output shaft of the engine.