Freescale Semiconductor, Inc.
Chassis/Safety
ELECTROHYDRAULIC BRAKING
KEY BENEFITS
SG2007/D, REV 0
12/2002
Freescale Semiconductor, Inc...
• Reuses hydraulic system
technology while incrementally
building on the development of
advanced electronic systems, such
as electronic stability programs
(ESP), traction control, and brake
assist
• Uses software updates to simplify
the calibration process by
adjusting brake response and
pedal feel
• Improves connectivity with other
emerging systems, such as
adaptive cruise control
• Removes the large vacuum servo to
allow flexible installation
• Features an anti-lock braking
system (ABS) without feedback
from the pedal
OVERVIEW
Electrohydraulic braking (EHB) systems are
designed to allow electronic control of vehicle
braking while retaining a reduced hydraulic
system. The hydraulic system functions as a
reserve in the event of a failure in the electronic
control.
The EHB control unit receives inputs from sensors
connected to the brake pedal. In normal operation,
a backup valve is closed and the controller
activates the brakes of the wheel through an
electric motor driven hydraulic pump. When the
controller goes into a fail-safe mode, the backup
valve is opened, which allows the brakes to be
controlled through a conventional hydraulic
circuit.
For More Information On This Product,
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Freescale Semiconductor, Inc.
Pedal Sensor
Hydraulic Pump
Accumulator
EHB Control Unit
•
MCU
•
Output Driver Hardware
Backup Valve
Freescale Semiconductor, Inc...
Hydraulic Brake Actuators
Figure 1. Electrohydraulic Braking Block Diagram
MOTOROLA ORDERING INFORMATION
Contact your Motorola sales representative for complete information about existing products and custom solutions.
Part Number
MPC500
SMARTMOS
Product Highlights
32-bit microcontrollers
Integrated circuits
Additional Information
www.motorola.com/semiconductors
NOTE
www.motorola.com/analog
NOTE: Search on the listed part number.
DESIGN CHALLENGES
Electrohydraulic braking is based on existing ABS systems with the addition of several enhancements. The inclusion of analog
electrohydraulic valves requires closed-loop, current-controlled pulse width modulation (PWM) outputs from the electronic control unit
(ECU).
An EHB system is required to incorporate a fail-safe state in the event of a fault occurring. To correctly initiate the fail-safe state, the
system relies on its electronic components to provide a high level of operational fault coverage.
MOTOROLA SOLUTION
An EHB system requires mid-range performance MPC500 microcontrollers for system control with SMARTMOS companion chips for
functions such as load driving, sensor interfacing, voltage regulation, and system watchdog operation.
Motorola has gained experience developing many of the specific aspects required for the implementation of an EHB system. Because
of its extensive experience in the development of fail-safe microcontrollers, braking-specific modules such as the wheel speed timer,
and a software center including drivers, tools, and operating systems, Motorola has proven its ability to develop the right solutions in
collaboration with its customers.
SG2007-2
For More Information On This Product,
Go to: www.freescale.com
Electrohydraulic Braking
Freescale Semiconductor, Inc.
DEVELOPMENT TOOLS
Vendor
MPC555 MPC561 MPC562 MPC563 MPC564 MPC565 MPC566 TPU
Metrowerks
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CodeWarrior for Embedded PowerPC ISA
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CodeWarrior for OSEK RTOS
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CodeWarrior Development Systems
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OSEKturbo (RTOS)
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TPU Low-Level Driver Library
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Flash Programming —
CodeWarrior for Embedded PowerPC ISA
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Flash Programming —
CodeWarrior for OSEK RTOS
Wind River Systems
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BDM Debugger — SingleStep
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BDM Debugger — SingleStep with Vision
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Flash Programming — SingleStep
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BDM Debugger — VisionCLICK
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Nexus Debugger — VisionCLICK
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Nexus Debugger — SingleStep with Vision
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Flash Programming — VisionCLICK
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Compiler — DiabData
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MATRIXX
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Simulator — SingleStep
Lauterbach
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BDM Debugger Trace32
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Nexus Debugger Trace32
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Code Trace (with Bus access)
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Code Trace (Nexus)
Axiom Manufacturing
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Low-Cost Evaluation Board
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Mid-Range Evaluation Board
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Full-Feature Evaluation Board
Ashling Microsystems
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BDM Debugger — Opella, Genia, and Vitra
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Nexus Debugger — Vitra (w/trace)
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Nexus Debugger — Opella, Genia
Green Hills Software
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IDE, Debugger — Multi
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Compiler — C/C++/EC++
P&E Microcomputer Systems
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Low-Cost Debugger
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Flash Programming Tools
GNU
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Compiler/Debugger
ASH WARE
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TPU Simulator
Freescale Semiconductor, Inc...
Electrohydraulic Braking
For More Information On This Product,
Go to: www.freescale.com
SG2007-3
Freescale Semiconductor, Inc.
DEVELOPMENT TOOLS (continued)
Vendor
ETAS
ErCOSEK
Calibration Tools (ETK)
Calibration Tools (ETK) Nexus
dSPACE
TargetLink
dli
Logic Analyzer
Agilent Technologies
Logic Analyzer
Inverse Assembler, Source Correlation
Emulation Probe (BDV)
Tektronix
Logic Analyzer
Abatron AG
BDM Support
Accelerated Technology
Nucleus (RTOS)
MPC555 MPC561 MPC562 MPC563 MPC564 MPC565 MPC566 TPU
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Freescale Semiconductor, Inc...
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THIRD PARTY SUPPORT
Vendor
Metrowerks
Axiom Manufacturing
Wind River Systems
Green Hills Software
Lauterbach
Accelerated Technology
Ashling Microsystems
ASH WARE
GNU
ETAS
dSPACE
P&E Microcomputer Systems
Contact Information
800-377-5416 (www.metrowerks.com)
972-926-9303 (www.axman.com)
800-872-4977 (www.windriver.com)
805-965-6044 (www.ghs.com)
508-303-6812 (www.lauterbach.com)
800-468-6853 (www.acceleratedtechnology.com)
408-732-6490 (www.ashling.com)
503-533-0271 (www.ashware.com)
617-542-5942 (www.gnu.org)
888-382-7462(www.etasinc.com)
248-567-1300 (www.dspace.com)
617-353-9206 (www.pemicro.com)
Electrohydraulic Braking
For More Information On This Product,
Go to: www.freescale.com
SG2007-4
Freescale Semiconductor, Inc.
RELATED INFORMATION
For inquiries about Motorola products, contact the Technical Information Center at 800-521-6247, or visit us online at
www.motorola.com/semiconductors.
Online Topics
MPC500
Analog and Mixed Signal
32-Bit Development Tools
Related Product
Product Number
MPXV6115V
NOTE: Search on the product number listed.
Product Name
High temperature accuracy integrated silicon
pressure sensor — small outline package
Contact Information
www.motorola.com/semiconductors
NOTE
Freescale Semiconductor, Inc...
Electrohydraulic Braking
For More Information On This Product,
Go to: www.freescale.com
SG2007-5
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