Patent ID: 8340877

Claim:
An engine speed synchronizer for a powertrain including an engine, a manual transmission and an engine clutch, the manual transmission including a shift lever arranged to individually engage speed gears of the manual transmission, the engine clutch having an engine side connected to an output side of the engine and a transmission side connected to an input side of the manual transmission, the engine speed synchronizer comprising: a first sensor for sensing an operation of the shift lever; a second sensor for measuring a transmission input speed as a rotational speed of the input side of the manual transmission; and a controller connected to the first and second sensors, and configured to: synchronize rotation of the engine side of the engine clutch with rotation of the transmission side of the engine clutch by controlling, with reference to an operation of the shift lever, an engine speed as a rotational speed of the output side of the engine, under condition that the engine clutch is disengaged; determine whether or not the transmission input speed has started to change in a direction conforming to the operation of the shift lever; permit the synchronization in response to a determination that the transmission input speed has started to change in the conforming direction; and inhibit the synchronization in response to a determination that the transmission input speed has not started to change in the conforming direction.