Abstract
The engagement control of an automatic mechanical transmission (AMT) clutch during the hill start of a heavy-duty vehicle has a significant impact on the comfort, safety and service life of the vehicle. However, the control effect of a traditional control strategy can be easily affected by interference (clutch wear, temperature). Therefore, this paper proposes a two-layer structure control strategy based on an AMT clutch automatic actuator with the clutch engagement speed as the control target. First, the clutch automatic actuator is designed and the governing characteristics of the diesel engine and the control characteristics of the solenoid valve are studied. Second, a logic threshold control method and PID control method are adopted in the proposed two-layer structure control method. Moreover, the robustness of the proposed control algorithm is validated by a co-simulation platform (TruckSim, MATLAB/Simulink). Finally, experimental research under different slopes (13% and 22%) is carried out to verify the simulation results. The experimental results prove that compared with a single-layer control strategy, the two-layer control strategy proposed in this paper can shorten the start time by more than 10%, and reduce the vehicle start-up jerking by approximately 20%, which significantly improves the performance of the vehicle in the hill start process.
Highlights
With the rapid development of the automobile industry, the safety of drivers and the stability of vehicles have received increasing attention from researchers
To ensure that the clutch can still achieve the required engagement speed and transfer enough torque when the vehicle is subjected to external interference, this paper proposes a two-layer structure control strategy based on a clutch automatic actuator
SIMULATION AND ANALYSIS To verify the two-layer structure control strategy based on an automatic mechanical transmission (AMT) clutch automatic actuator proposed in this paper, the vehicle model was developed on the Trucksim platform and the controller model was designed on the MATLAB/Simulink platform
Summary
With the rapid development of the automobile industry, the safety of drivers and the stability of vehicles have received increasing attention from researchers. By optimizing the control of clutch engagement, it is possible to reduce clutch wear, shorten the vehicle start time, and reduce jerking and friction work [11], [12]. Based on previous research [28], [29], this paper proposes a two-layer structure control algorithm based on an AMT clutch automatic actuator, taking a heavy-duty vehicle as the research object and the clutch engagement speed as the control target. Simulation and experimental results fully demonstrate the feasibility of the proposed control algorithm, which shortens the start time of the vehicle and reduces the start-up jerking and friction work and greatly improves the starting performance of the vehicle.
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