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Although various types of engines with a variable valve lift mechanism have been developed and introduced, we have developed a Three Dimensional Cam for Variable Valve Lift and Timing mechanism (3D Cam VVLT) as a technology to simultaneously improve fuel consumption and power. In 3D Cam VVLT, the position of 3D Cam slide decides valve lift and timing simultaneously. The 3D Cam VVLT is composed of a mechanical section including 3D Cam, an accelerator motor to drive the mechanical section, and an accelerator controller to control the cam position. The target slide position of the cam is calculated from engine speed and accelerator grip opening ratio. And the position of the cam is sifted by the accelerator motor. The cam position control requires quick response time, stability, and smoothness.

This paper describes the design and features of a new-type data acquisition system for racing motorcycles. With the technological advances of developments and measurements of the racing motorcycles, the functions of the system needed to be enhanced to incorporate the following: to extend number and type of input signals, to efficiently compare the large amount of data which were acquired in different test conditions, to annotate measured data with test conditions and rider comments, to operate simply and easily from the measurement to the analysis, and to have compact and light on-board hardware to ensure competitive riding. The integrated data acquisition system was newly developed with consideration of these requirements. The new system is composed of an onboard system, a remote data-analyzer which is a personal computer with customized software, and a remote data-buffer. The on-board system is composed of a core-module and function-modules.