Using Brake and Engine Torque to Control Traction on Either Side of the Drive Wheel
10 months ago
Authors:
Phan Tấn Tài,Tran Van Nhu
Publication date:
15 / 03 / 2023
Name of Publishers:
VNUHCM PRESS
Abstract:
Traction created at the drive wheels is a result
of the dynamic transformation from the engine through the
powertrain to the wheels and acting on the road surface. The
traction is limited by the grip-ability between the wheel and
the road. The value of traction also depends on the value of
the engine torque output. When the engine torque is too high,
the wheels rotate too quickly while the grip-ability of the road
is limited, resulting in the wheels turning too fast. If the wheel
slips, the traction will be down by its decreased grip. Another
hand, the traction on both sides of the drive wheels complies
with the law distribution of the active differential. This
distribution rule also depends on the grip-ability tire with the
road on either side of the drive wheel, the lower grip-ability
of the side wheel, and the lower differential that distributes
traction torque for that side wheel. In this study, the authors
present a method of controlling the traction at the drive
wheels by using the braking torque impacts on the more
slipped wheel with the other and reducing traction engine
torque as needed. It is a linear-quadratic-regulator (LQR)
controller with two outputs such as making the braking torque
acting on the wheel that slips and controlling the engine
torque by an act on the throttle mechanism. Simulation results
under specific conditions show high control accuracy, stable
wheel traction control, and improved engine torque.