P4-Explore Integrated Electronic Parking Brake System
Electronic parking brake (EPB) is an electronically controlled
parking brake. Through the electronic Control unit (ECU) and
actuator mechanism, the driver presses a button to activate the
holding mechanism, which electrically applies the brake discs to
the rear wheels. Currently there are two types of mechanisms in
production, the wire puller system and the caliper integrated
system. EPB systems can be considered as a subset of linear control
technology.
Functionality
In addition to the basic vehicle retention functions required to
perform the parking brake, the EPB system provides additional
functions, such as automatic release of the parking brake when the
driver depresses the accelerator or slips the clutch, and
re-clamping using additional force when vehicle motion is detected.
In addition, the EPB can be used to implement the ramp hold
function, which applies braking to prevent backsliding when the
ramp is pulled away,
A new design of integrated Electric Parking Brake system, called
iEPB and integrated in the brake caliper, is introduced in this
paper. It consists of an electrically operated brake unit and a
hydraulically pressed unit independently, and uses a special
self-locking mechanism instead of a screw device to increase the
efficiency and the working speed. With all conventional EPB
system’s advantages, it also provides a stronger brake performance
and a faster reaction time. In this paper, we describe the working
principle of this new design at first, and then introduce the
arrangement of the testing system, followed by a discussion of
experimental data. The testing results prove the feasibility of
this design. The conclusion paragraph summarizes the key points
about the design of the iEPB system. INTRODUCTION The iEPB system
is more convenient and safety than traditional parking systems.
It’s operated and released automatically. With integrated
intelligent function, the iEPB system has the following merits: •
Replace a hand lever by an operation button. • Because of no hand
lever, there is more space in the vehicle. • Combining a control
unit, the iEPB system can be automatically operated and released at
the right time, which makes the operation simpler and the driver to
feel more comfortable and safer. • With high performance mechanism,
the iEPB system has a faster reaction time. So we can provide the
Auto-Hold function by adopting the iEPB system. There are two types
of existing electric parking brake. One type is the cable
puller[3], and the other is the integrated caliper[4]. This new
design belongs to the integrated caliper type. Almost 100%
integrated caliper type of market products use the screw device as
its linear mechanism. The screw device can provide a large
reduction ratio in a small space and transfer the rotation motion
into linear motion with a non-reverse feature. But a low mechanical
efficiency due to the screw friction makes a great energy lose. In
this paper, we introduce a new design that is a type of screw free
concept. Basing on the same power source, the screw free design can
reduce about three-quarter reaction time of the system
SYSTEM DESCRIPTION For improving working speed, enhancing mechanism
efficiency and providing a non-reverse feature at the same time,
the iEPB mechanism design is the key point. The important factors
that need to be considered include:
Caliper pressing force. • Working time of the actuator. • Power
consumption. • Parking force that can be maintained when power off.
| TEI Racing Rotor Size | Minimum Inch Wheel Size |
| 285*24mm | 15inch wheels |
| 300*24mm | 16inch wheels or above |
| 300*28mm | 17inch wheels or above |
| 330*28mm | 17inch wheels or above |
| 345*28mm | 18inch wheels or above |
| 355*32mm | 18inch wheels or above |
| 378*32mm | 19inch wheels or above |
| 405*34mm | 20inch wheels or above |
