A Speed Control for the Reduction of the Shift Shocks in Electric Vehicles with a Two-Speed AMT

In the present paper, a speed control algorithm with fast response characteristics is proposed to reduce the shift shock of medium/large-sized electric vehicles equipped with a two-speed AMT. Shift shocks, which are closely related with to the vehicles’ ride comfort, occur due to the difference between the speed of the motor shaft and the load shaft when the gear is engaged. The proposed speed control method for shift shock reduction can quickly synchronize speeds occurring due to differences in the gear ratios during speed shifts in AMT systems by speed command feed-forward compensation and a state feedback controller. As a result, efficient shift results without any shift shock can be obtained. The proposed speed control method was applied to a 9 m- long medium- sized electric bus to demonstrate the validity through a simulated analysis and experiments.

[1]  Seung-Ki Sul,et al.  Advanced gear-shifting and clutching strategy for a parallel-hybrid vehicle , 2000 .

[2]  Young-Sik Pyoun,et al.  Durability Performance Analysis of a Differential Gear for a Low Speed Vehicles , 2012 .

[3]  Seung-Ki Sul,et al.  Identification of the Mechanical Parameters for Servo Drive , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[4]  Kaushik Rajashekara,et al.  Present Status and Future Trends in Electric Vehicle Propulsion Technologies , 2013, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[5]  Qiang Lv,et al.  Engine speed control for the automatic manual transmission during shift process , 2012, 2012 2nd International Conference on Consumer Electronics, Communications and Networks (CECNet).

[6]  Th. Hartkopf,et al.  A high speed induction machine with two-speed transmission as drive for electric vehicles , 2006, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006..

[7]  Si-Doek Oh,et al.  Design of 2-speed transmission for electric commercial vehicle , 2014 .

[8]  T. Hofman,et al.  Energy efficiency analysis and comparison of transmission technologies for an electric vehicle , 2010, 2010 IEEE Vehicle Power and Propulsion Conference.

[9]  Paul D. Walker,et al.  Experimental Verification of regenerative braking energy recovery system based on electric vehicle equipped with 2-speed DCT , 2014 .

[10]  Zhang Yan,et al.  Application of automatic manual transmission technology in pure electric bus , 2008, 2008 IEEE Vehicle Power and Propulsion Conference.

[11]  Mir Saman Rahimi Mousavi,et al.  Dynamic modeling and controller design for a seamless two-speed transmission for electric vehicles , 2014, 2014 IEEE Conference on Control Applications (CCA).

[12]  L. Glielmo,et al.  Speed control for automated manual transmission with dry clutch , 2004, 2004 43rd IEEE Conference on Decision and Control (CDC) (IEEE Cat. No.04CH37601).

[13]  Junqiang Xi,et al.  Optimal speed synchronization control for clutchless AMT systems in electric vehicles with preview actions , 2014, 2014 American Control Conference.

[14]  Lino Guzzella,et al.  Topology Optimization for Hybrid Electric Vehicles With Automated Transmissions , 2012, IEEE Transactions on Vehicular Technology.