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In this paper, we compared, through experiments, the hysteresis characteristics in the load of the push rod, that is generated in the booster cylinder according to the time of the instantaneous actions made by the driver in stepping on and releasing the clutch pedal. In addition, we performed separated experiments to identify how the hysteresis characteristics of the pedal effort generated in the pedal unit and the hysteresis characteristics of the pedal effort that occurred in the booster push rod when the driver stepped on the clutch pedal, appeared in varied form, in a case when the compressed air of 8.0bar was applied into the internal booster and in another case without applying the compressed air. As the experimental results, it was found that when the compressed air was applied, the stroke of the push rod has increased and thereby the maximum load continued to be applied to the booster. Also it was confirmed that the load applied to the pedal unit when you step on the clutch pedal was found to be 25kgf when unapplied showing an increase of more than three times compared to 7.5kgf recorded when the compressed air was applied, which will accordingly cause an increase in degree of fatigue of the driver.

Comparison of clutch hysteresis characteristics depending on the pedaling time and the compressed air