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Hierarchical control of starting process for wet dual clutch transmission based on direct-drive pump-controlled hydraulic actuator

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Abstract

In this study, a new type of direct-drive pump-controlled hydraulic actuator is proposed for wet dual clutch transmission. The hierarchical control of the vehicle starting process was investigated based on this new hydraulic actuator. First, a starting intention recogniser was constructed through support vector machine to recognise the driver’s starting intention in real time. Subsequently, the hierarchical control of the starting process was divided into the planning and actuator control layers. The planning layer considered jerk, starting time, and friction work as optimisation objectives to plan the reference trajectory for the actuator control layer, in which an improved constant torque control strategy was used for the engine and an infinite time linear quadratic optimal controller was designed for the clutch. Finally, in view of the nonlinear characteristics of the direct-drive pump-controlled actuator, a linear active disturbance rejection control technique was employed to obtain real-time tracking of the reference trajectory. The simulation results showed that the engine–clutch cooperative control strategy can achieve less jerk and friction loss than the conventional starting control strategy under the premise of ensuring the starting time; moreover, LADRC showed excellent tracking performance and robustness.

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Acknowledgements

This work has been supported by The State Key Laboratory of Mechanical Transmission, Chongqing University, China; the financial support of this work by the National Natural Science Foundation of China (grant no. U1764259).

Funding

National natural science foundation of china,U1764259, Datong Qin.

Author information

Authors and Affiliations

  1. State Key Laboratory of Mechanical Transmission & College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing, 400044, China

    Ke Ma, Dongye Sun, Dongyang Wang, Guanlong Sun & Datong Qin

Authors
  1. Ke Ma
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  2. Dongye Sun
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  3. Dongyang Wang
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  4. Guanlong Sun
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  5. Datong Qin
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Corresponding author

Correspondence to Dongye Sun.

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Technical Editor: Wallace Moreira Bessa.

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Appendices

Appendix A: Simulation parameters of the vehicle and DCT

Parameters

Units

Value

Vehicle mass

kg

1995

Tire radius

m

0.36

Rolling resistance coefficient

—

0.018

Vehicle frontal area

m2

2.6

Aerodynamic force coefficient

–

0.36

Slope angle

–

0

Density of the air

kg/m3

1.225

Gear ratio

–

4.214

Final differential ratio

–

3.944

Inertia moment of the engine

kg·m2

0.187

Equivalent inertia of the clutch driven plate

kg·m2

1.0087

Damping coefficient of the engine

Nm·s/rad

0.06

Equivalent damping of the clutch driven plate

Nm·s/rad

0.08

Static friction coefficient

–

0.13

Dynamic friction coefficient

–

0.11

Outer radius friction plate

mm

96.25

Inner radius friction plate

mm

82.35

Number of friction surfaces

–

6

Appendix B: Parameters used in the simulation

Parameters

Units

Value

Cross-sectional area of the clutch piston

m2

0.0046

Return spring stiffness

Nm/rad

1.38 × 105

Idle stroke

mm

3

Total volume of the clutch chamber and the oil supply line

m3

2.83 × 10–5

Displacement of hydraulic pump

ml/rev

1.6

Leakage coefficient

m3/pa·s

1.5 × 10–11

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Ma, K., Sun, D., Wang, D. et al. Hierarchical control of starting process for wet dual clutch transmission based on direct-drive pump-controlled hydraulic actuator. J Braz. Soc. Mech. Sci. Eng. 44, 426 (2022). https://doi.org/10.1007/s40430-022-03721-6

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