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AssigneeToyota Jidosha Kabushiki Kaisha
InventorAkihiro Yanai
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A valve is urged in the valve-opening direction by an upper spring and in the valve-closing direction by a lower spring. The valve is thus urged to a neutral position where the respective urging forces are balanced. The valve is controlled to be released from one of two terminal positions, that is, the full-open position or the full-closed position, and to be attracted to the position from which the valve has been released. The displacement pattern of the valve during this period is sensed by a displacement amount sensor, whereby the maximum displacement amount of the valve from that terminal position is measured. The change of the neutral position is detected based on the change of the measured maximum displacement amount with respect to a reference value.
An apparatus for detecting a change of a neutral position of a valve of an electromagnetic valve actuation system, the valve being urged to the neutral position by urging forces of urging members for urging the valve in valve-opening and valve-closing directions, the neutral position being a position where the urging forces are balanced, the apparatus comprising:
A method for detecting a change of a neutral position of a valve of an electromagnetic valve actuation system, comprising:
Dependencies are inferred from the claim text.