| 摘要 |
PURPOSE: An oil injection method is provided to stably inject oil to a hydraulic cylinder by rotating a motor with a specific control pattern. CONSTITUTION: A normal operation mode is established by checking safety sensors formed on each part of systems. A car is operated to move up and down by rotating a hydraulic motor clockwise and counterclockwise according to an operation command. As an oil injection mode is established, a check valve is switched to an open state by driving an associated valve formed on a pilot pipe. The rotating speed of the hydraulic motor is gradually increased for maintaining a specific speed as an operation command key is pressed. Thus, oil is injected to a cylinder by repeatedly switching the check valve while maintaining the rotating speed of the hydraulic motor at the specific speed.
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