Ethernet in Automotive applications
Helge Zinner
Norbert Balbierer
Continental Automotive GmbH
The Fully Networked Car
Geneva, 3-4 March 2010
1
Continental Ethernet/IP Motivation
2
Car Networks Evolution and Forecast
Increasing
o
Bandwidth
o
Technology Diversity
o
Nr. of Sub-Networks
o
Complexity
o
BoM
o
Personal Costs
o
Weight
o
Cable Space
The most successful
Network Technology
becomes Automotive
BU I&C
BU ID
Bandwidth
Complexity&Costs w/o IP/Ethernet
Complexity&Costs with IP/Ethernet
1970
Today
Next step
Vision
BU I&C
Multimedia
Rearseat
Instrum
entation
&
Displays
Connectivity
Telematics
BU B&S
Antenna
BU ADAS
BU B&S
Cameras
Body
Control
Div C
Div P
BU S, CC, EBS
BU C
Mobile
Devices
BU ES, S&A, TR
IP (Internet Protocol) / Ethernet
"Wireless"
Ethernet
1970
Today
The Fully Networked Car
Geneva, 3-4 March 2010
Next Step
Vision
Optical
Ethernet
Seamless IP World
Electrical
Ethernet
Topics currently addressed
o Real Time Ethernet for Automotive
• AVB introduction
• AVB for Automotive
o Network and configuration management
• Selective wakeup and shutdown
• Car network management
The Fully Networked Car
Geneva, 3-4 March 2010
3
Real Time Ethernet for Automotive
What is Audio Video Bridging (AVB)?
802.1
AS
Time Synchronisation
802.1
Qav
Forwarding and Queuing Enhancements
802.1
Qat
Stream Reservation
The Fully Networked Car
Geneva, 3-4 March 2010
4
Real Time Ethernet for Automotive
Why does AVB suite In-Vehicle Requirements?
802.1
AS
Speaker
o Common time basis
• Synchronization of networked ECUs
• Coordinating multiple ECUs
TFT
Speaker
DVD
RSE
o Meets jitter and wander requirements
• Guarantees timely execution
• Administration free protocol
Speaker
Switch
Master Clock
The Fully Networked Car
Geneva, 3-4 March 2010
Synchronized Clock
HU
Switch
5
Real Time Ethernet for Automotive
Why does AVB suite In-Vehicle Requirements?
Switch
Switch
ABS
DVD
o Segregate, rate frames in Switches
• Separation of Real time traffic (e.g. Brake)
from Non-real time traffic (e.g. Audio)
• Allows physical consolidation of subnetworks
• Protects the vehicle from external traffic
802.1
Qav
ACC
o Queing and traffic shaping
The Fully Networked Car
Geneva, 3-4 March 2010
HU
• Assures maximum delays
• Reduces latency
• Gives class based gurantees
6
Real Time Ethernet for Automotive
Why does AVB suite In-Vehicle Requirements?
Resource Reservation
Switch
7
Switch
ABS
o Event triggered QoS
ACC
• Flexible to changing environments
• More effective use of bandwidth
TFT
o Dynamic network resource reservation
802.1
Qat
• Reservation on demand
• Guarantees fixed ressources
• Dynamic End-to-End management
The Fully Networked Car
Geneva, 3-4 March 2010
CAM
Real Time Ethernet for Automotive
Impact of AVB on Architecture
8
Powertrain
Chassis
Multimedia
Body
Multimedia Powertrain Multimedia Powertrain
The Fully Networked Car
Geneva, 3-4 March 2010
Real Time Ethernet for Automotive
Summary and next steps
o Ethernet AVB provides Quality of Service necessary in the
vehicle
o Ethernet AVB provides similar costs to standard Ethernet
o Current activities:
Integration of AVB in Automotive ECUs
o The authors recommend to use standards
o Research on QoS model for different data transmission
o Evaluation of enhancements and modifications of AVB
The Fully Networked Car
Geneva, 3-4 March 2010
9
Network and Configuration Management
o Not all ECUs needed at a time, depending on vehicle state
 Energy can be preserved by disabling unneeded devices
o Need for controlled activation and deactivation of devices or
subsystems
o At present: done by energy detection on common bus systems
(CAN, MOST, FlexRay)
Bus topology
The Fully Networked Car
Geneva, 3-4 March 2010
10
Network and Configuration Management
Energy detection in fully switched Ethernet networks
o Physical point-to-point
connections
o Activity only detected by one
single host
o Control host state by
controlling link state
o Advantage:
Ability to control devices
individually
The Fully Networked Car
Geneva, 3-4 March 2010
Switched Ethernet
11
Network and Configuration Management
Link Pulses
o Sent when PHY is enabled
o Used for
• Link Test (10BaseTX)
• Autonegotiation (100,
1000BaseT)
o Sent every 16 ms
o New additional use:
Link energy control
The Fully Networked Car
Geneva, 3-4 March 2010
Single pulse: approx. 2 V
amplitude, 100 ns duration
12
Network and Configuration Management
Fundamental elements of the concept
Network
Manager
Control &
Surveillance
Notifications
Switch
Manager
The Fully Networked Car
Geneva, 3-4 March 2010
Link Activity
management protocol,
e.g. SNMP
Link
Energy
Detection
13
Network and Configuration Management
Current activities and next steps
14
o Integration of SNMP into an Automotive Environment
o Examination of different approaches to network
configuration
o Research on algorithms which allow dynamic reconfiguration
of the system
o Analysis of energy saving capabilities
o Realization of an experimental model network for concept
evaluation
The Fully Networked Car
Geneva, 3-4 March 2010
15
For Questions/Discussion
Please mail to:
helge.zinner@continental-corporation.com
norbert.balbierer@continental-corporation.com
josef.noebauer@continental-corporation.com
Continental Automotive GmbH
Regensburg, Germany
The Fully Networked Car
Geneva, 3-4 March 2010
16
Backup
The Fully Networked Car
Geneva, 3-4 March 2010
Demonstrator Setup
The Fully Networked Car
Geneva, 3-4 March 2010
17