Abstract—In this paper, a brake system for an automatic transmission(AT)-based
hybrid electric vehicle (HEV) is developed, and
a regenerative braking cooperative control algorithm is proposed,
with consideration of the characteristics of the brake system. The
brake system does not require a pedal simulator or a fail-safe
device, because a hydraulic brake is equipped on the rear wheels,
and an electronic wedge brake (EWB) is equipped on the front
wheels of the vehicle. Dynamic models of the HEV equipped with
the brake system developed in this study are obtained, and a
performance simulator is developed. Furthermore, a regenerative
braking cooperative control algorithm, which can increase the
regenerative braking energy recovery, is suggested by considering
the characteristics of the proposed hydraulic brake system. A
simulation and a vehicle test show that the brake system and
the regenerative braking cooperative control algorithm satisfy
the demanded braking force by performing cooperative control
between regenerative braking and friction braking. The regenerative
braking cooperative control algorithm can increase energy
recovery of the regenerative braking by increasing the gradient of
the demanded braking force against the pedal stroke. The gradient
of the demanded braking force needs to be determined with
consideration of the driver’s braking characteristics, regenerative
braking energy, and the driving comfort.
Index Terms—Cooperative control, electronic wedge brake
(EWB), hybrid electric vehicle (HEV), hydraulic brake, regenerative
braking.
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