Abstract
Hybrid vehicles usually have several braking systems, and braking mode switches are significant events during braking. It is difficult to coordinate torque fluctuations caused by mode switches because the dynamic characteristics of braking systems are different. In this study, a new type of plug-in hybrid vehicle is taken as the research object, and braking mode switches are divided into two types. The control strategy of type one is achieved by controlling the change rates of clutch hold-down and motor braking forces. The control strategy of type two is achieved by simultaneously changing the target braking torque during different mode switch stages and controlling the motor to participate in active coordination control. Finally, the torque coordination control strategy is modeled in MATLAB/Simulink, and the results show that the proposed control strategy has a good effect in reducing the braking torque fluctuation and vehicle shocks during braking mode switches.
Highlights
Hybrid electric vehicles (HEVs) have attracted significant research attention because they can effectively reduce fuel consumption and emissions [1,2,3]
A new type of plug-in hybrid was taken as the research object and the braking force distribution strategy which takes the engine drag resistance torque into consideration was put distribution strategy which takes the engine drag resistance torque into consideration was put forward
Two coordinated control strategies which correspond to correspond to the two types were developed by analyzing the clutch and the characteristics of the the two types were developed by analyzing the clutch and the characteristics of the hydraulic and the hydraulic and the motor braking systems
Summary
Hybrid electric vehicles (HEVs) have attracted significant research attention because they can effectively reduce fuel consumption and emissions [1,2,3]. The different dynamic characteristics of hydraulic, motor, and engine braking systems cause torque fluctuations during braking mode switch, which deteriorates the riding comfort and the vehicle safety. Zhu of Tongji University designed a brake force distribution correction module and a motor force compensation module for transition conditions These included hydraulic brake force intervention conditions, hydraulic brake force evacuation conditions, and regenerative brake force evacuation conditions with low speed. Conditions, and regenerative brake force evacuation conditions with low speed Those studies investigated the coordination control between the motor and the mechanical braking system [11]. The dynamic characteristics of the hydraulic, motor, and engine braking systems In this this study, new type type of of plug-in plug-in hybrid hybrid vehicle vehicle is is taken taken as as the object, and and the the braking.
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