Detailed Modeling and Experimental Assessments of Automotive Dry Clutch Engagement

Abstract

The characteristics of the clutch engagement process would have significant influences on the torque transmissibility and operation comfort. However, some crucial components are simplified in many previous literature, which would cause imprecision. Therefore, it is important to build a detailed mathematical model of these components and inspect the whole process of clutch engagement. In order to improve the torque transmissibility and achieve better pedal releasing comfort, solutions based on the modeling of the clutch cover assembly and the friction disc assembly, the analysis of the clamping force and the releasing characteristics of the release bearing are proposed in this paper. Furthermore, models of the crucial components such as the diaphragm spring, which connects the straps and cushion plate, are built and the corresponding mechanical properties are analyzed. Based on the manufacturing tolerance, the life cycle, and the wear properties, diaphragm spring correction formula is proposed by referring to Almen-Laszlo method. On the system level, the whole engagement process is divided into four stages because of the differences between the engaging and disengaging processes, which would affect the pedal releasing comfort in the manual transmission system and the shifting quality in the automated transmission system. To demonstrate the effectiveness of the proposed method, detailed mathematic models are built and the corresponding experiments are conducted. INDEX TERMS Mathematical modeling, clutch engagement, cushion characteristics, torque transmissibility, operation comfort.

Motion Characteristics of a Clutch Actuator for Heavy-Duty Vehicles with Automated Mechanical Transmission

“…is the force of the release bearing acting on the release fork, and is the force of the release fork acting on the piston rod. The Almen-Laszlo formula is often used to indicate the force of the diaphragm acting on the pressure plate [30][31][32][33]. The force of the diaphragm acting on the pressure plate can be expressed in Equation (6).…”

“…Then, the relationship between the force of the piston rod and the displacement of the cylinder piston can be expressed in Equation ( 7) according to Equation (6). The Almen-Laszlo formula is often used to indicate the force of the diaphragm acting on the pressure plate [30][31][32][33]. The force of the diaphragm acting on the pressure plate can be expressed in Equation (6).…”

AMT Starting Control as a Soft Starter Using a Novel Data-Driven Method

“…The clutch transmitting torque can be expressed as a third-order polynomial concerning the big end displacement of the diaphragm spring [22]. The clutch actuator is an air cylinder controlled by the solenoid valves, and the piston displacement is proportional to the big end displacement of the diaphragm spring.…”

“…( ) = ( − 1) + ( − 1) (21) Similarly, the disengaging velocity of the clutch actuator can be described in equation (22).…”

Implementation of an Energy Management Strategy with Drivability Constraints for a Dual-Motor Electric Vehicle

“…Besides, it also has a low manufacturing cost and compact size [12]. The disadvantages of this transmission system, such as vibration and torque interruption while shifting, cannot be ignored, as well as the clutch failures resulting from significant wear [13,14].…”