www.docs.chipfind.ru
Chassis/Safety
ELECTROHYDRAULIC BRAKING
KEY BENEFITS
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.
SG2007/D, REV 0
12/2002
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Freescale Semiconductor, Inc.
For More Information On This Product,
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SG2007-2
Electrohydraulic Braking
Figure 1. Electrohydraulic Braking Block Diagram
MOTOROLA ORDERING INFORMATION
Contact your Motorola sales representative for complete information about existing products and custom solutions.
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.
Part Number
Product Highlights
Additional Information
MPC500
32-bit microcontrollers
www.motorola.com/semiconductors
NOTE
SMARTMOS
Integrated circuits
www.motorola.com/analog
NOTE: Search on the listed part number.
Hydraulic Brake Actuators
Pedal Sensor
Accumulator
Backup Valve
Hydraulic Pump
EHB Control Unit
MCU
Output Driver Hardware
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Freescale Semiconductor, Inc.
For More Information On This Product,
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Electrohydraulic Braking
SG2007-3
DEVELOPMENT TOOLS
Vendor
MPC555 MPC561 MPC562 MPC563 MPC564 MPC565 MPC566 TPU
Metrowerks
CodeWarrior for Embedded PowerPC ISA
CodeWarrior for OSEK RTOS
CodeWarrior Development Systems
OSEKturbo (RTOS)
TPU Low-Level Driver Library
Flash Programming --
CodeWarrior for Embedded PowerPC ISA
Flash Programming --
CodeWarrior for OSEK RTOS
Wind River Systems
BDM Debugger -- SingleStep
BDM Debugger -- SingleStep with Vision
Flash Programming -- SingleStep
BDM Debugger -- VisionCLICK
Nexus Debugger -- VisionCLICK
Nexus Debugger -- SingleStep with Vision
Flash Programming -- VisionCLICK
Compiler -- DiabData
MATRIXX
Simulator -- SingleStep
Lauterbach
BDM Debugger Trace32
Nexus Debugger Trace32
Code Trace (with Bus access)
Code Trace (Nexus)
Axiom Manufacturing
Low-Cost Evaluation Board
Mid-Range Evaluation Board
Full-Feature Evaluation Board
Ashling Microsystems
BDM Debugger -- Opella, Genia, and Vitra
Nexus Debugger -- Vitra (w/trace)
Nexus Debugger -- Opella, Genia
Green Hills Software
IDE, Debugger -- Multi
Compiler -- C/C++/EC++
P&E Microcomputer Systems
Low-Cost Debugger
Flash Programming Tools
GNU
Compiler/Debugger
ASH WARE
TPU Simulator
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Freescale Semiconductor, Inc.
For More Information On This Product,
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Electrohydraulic Braking
SG2007-4
THIRD PARTY SUPPORT
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)
Vendor
Contact Information
Metrowerks
800-377-5416 (www.metrowerks.com)
Axiom Manufacturing
972-926-9303 (www.axman.com)
Wind River Systems
800-872-4977 (www.windriver.com)
Green Hills Software
805-965-6044 (www.ghs.com)
Lauterbach
508-303-6812 (www.lauterbach.com)
Accelerated Technology
800-468-6853 (www.acceleratedtechnology.com)
Ashling Microsystems
408-732-6490 (www.ashling.com)
ASH WARE
503-533-0271 (www.ashware.com)
GNU
617-542-5942 (www.gnu.org)
ETAS
888-382-7462(www.etasinc.com)
dSPACE
248-567-1300 (www.dspace.com)
P&E Microcomputer Systems
617-353-9206 (www.pemicro.com)
DEVELOPMENT TOOLS (continued)
Vendor
MPC555 MPC561 MPC562 MPC563 MPC564 MPC565 MPC566 TPU
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Electrohydraulic Braking
SG2007-5
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.
Related Product
Online Topics
MPC500
Analog and Mixed Signal
32-Bit Development Tools
Product Number
Product Name
Contact Information
MPXV6115V
High temperature accuracy integrated silicon
pressure sensor -- small outline package
www.motorola.com/semiconductors
NOTE
NOTE: Search on the product number listed.
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Freescale Semiconductor, Inc.
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HOW TO REACH US:
USA/EUROPE/LOCATIONS NOT LISTED:
Motorola Literature Distribution
P.O. Box 5405
Denver, Colorado 80217
1-303-675-2140
1-800-441-2447
JAPAN:
Motorola Japan Ltd.
SPS, Technical Information Center
3-20-1, Minami-Azabu
Minato-ku
Tokyo 106-8573, Japan
81-3-3440-3569
ASIA/PACIFIC:
Motorola Semiconductors H.K. Ltd.
Silicon Harbour Centre
2 Dai King Street
Tai Po Industrial Estate
Tai Po, N.T. Hong Kong
852-26668334
TECHNICAL INFORMATION CENTER:
1-800-521-6274
HOME PAGE:
http://www.motorola.com/semiconductors
SG2007/D, REV 0
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or
guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the
application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or
incidental damages. "Typical" parameters can and do vary in different applications and actual performance may vary over time. All operating
parameters, including "Typicals", must be validated for each customer application by customer's technical experts. Motorola does not convey
any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as
components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other
application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer
purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its
officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use,
even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and the Stylized M Logo
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or service names are the property
of their respective owners.
Motorola, Inc. 2002
December2002
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Freescale Semiconductor, Inc.
For More Information On This Product,
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