Abstract: In a method for controlling a powered sliding door system, a standard time period for the sliding door to pass a calibration interval defined near a fully closed position under a standard duty ratio condition is measured, and the duty ratio of the drive pulse signal for the motor in the remaining interval of operation is determined from this standard time period so that the sliding door may move at a prescribed speed irrespective of the load acting on the door. This control method can be favorably used in combination with the process of detecting an obstacle in the path of the sliding door, which is based on the detection in the reduction in the speed of the sliding door, without any interference between them.

Abstract: A metal is attached on a passage-forming core by electrocasting to provide a primary metal layer. A plurality of grooves are formed on the primary metal layer and are filled with filler of low melting point. A metal is attached on the primary metal layer by electrocasting to provide a secondary metal layer. Openings are formed on the secondary metal layer adjacent to its opposite ends so as to communicate with the grooves. The filler in the grooves is melted to provide a plurality of coolant passages. The openings are filled with manifold-forming cores made of filler with low melting point. A metal is attached on the manifold-forming cores by electrocasting to provide tertiary metal layers. Through holes are formed on the tertiary metal layers. The passage-forming core is dissolved and the manifold-forming cores are melted to provide a gas passage and manifolds.