CAN Bus Voltage Levels

8. September 2015 09:32 by Christian in


CAN Bus Higher Layer Implementations

8. September 2015 09:25 by Christian in
As the CAN standard does not include tasks of application layer protocols, such as flow control, dev

As the CAN standard does not include tasks of application layer protocols, such as flow control, device addressing, and transportation of data blocks larger than one message, and above all, application data, many implementations of higher layer protocols were created. Several are standardized for a business area, although all can be extended by each manufacturer. For passenger cars, each manufacturer has its own standard. Among these implementations are:

• ARINC 825 (for the aviation industry)

• CANaerospace (for the aviation industry)

• CAN Kingdom

• CANopen (used for industrial automation)

• CCP / XCP

• DeviceNet (used for industrial automation)

• EnergyBus (used for electrical vehicles)

• GMLAN (for General Motors)

• ISO 15765-4

• ISO 11783 or ISOBUS (agriculture)

• ISO 14229

• SAE J1939 (heavy road vehicles)

• ISO 11992 for heavy trailers

• MilCAN

CAN bus 10

• NMEA 2000 (marine industry)

• RV-C (used for recreational vehicles)

• SafetyBUS p (used for industrial automation)

• SmartCraft

• Smart Distributed System (SDS)

• VSCP (used for building automation)


Christian Rosu


CAN Bus Standards

8. September 2015 09:19 by Christian in
There are several CAN physical layer and other standards: • ISO 11898-1: CAN Data Link Layer and Ph

There are several CAN physical layer and other standards:

ISO 11898-1: CAN Data Link Layer and Physical Signaling

ISO 11898-2: CAN High-Speed Medium Access Unit

ISO 11898-2 uses a two-wire balanced signaling scheme. It is the most used physical layer in car

Powertrain applications and industrial control networks.

ISO 11898-3: CAN Low-Speed, Fault-Tolerant, Medium-Dependent Interface

ISO 11898-4: CAN Time-Triggered Communication

ISO 11898-4 standard defines the time-triggered communication on CAN (TTCAN). It is based on the

CAN data link layer protocol providing a system clock for the scheduling of messages.

ISO 11898-5: CAN High-Speed Medium Access Unit with Low-Power Mode

ISO 11898-6: CAN High-speed medium access unit with selective wake-up functionality

ISO 11992-1: CAN fault-tolerant for truck/trailer communication

ISO 11783-2: 250 kbit/s, Agricultural Standard

ISO 11783-2 uses four unshielded twisted wires; two for CAN and two for terminating bias circuit

(TBC) power and ground. This bus is used on agricultural tractors. This bus is intended to provide

interconnectivity with any implementation adhering to the standard.

ISO 15765-2 also called ISO-TP, is a standard for flow control and handling of messages larger than eight bytes.

SAE J1939-11: 250 Kbit/s, Shielded Twisted Pair (STP)

SAE J1939-15: 250 Kbit/s, Unshielded Twisted Pair (UTP) (reduced layer)

The SAE J1939 standard uses a two-wire twisted pair, −11 has a shield around the pair while −15 does not. SAE 1939 defines also application data and is widely used in heavy-duty (truck) and autobus industry as well as in agricultural & construction equipment.


SAE = Society of Automotive Engineers; NMEA = National Marine Educators Association; SDS = Smart Distributed System



EMC component level RF Immunity (FMC1278 - RI 114) test setup configuration

30. August 2015 08:07 by streng in



Tire Blowout

25. August 2015 08:45 by Christian in
See Movie

See Movie


Changing Lanes

24. August 2015 09:22 by Christian in
1) Check mirrors 2) Signal before changing lanes3) Shoulder check 4) Check mirror again then change

1) Check mirrors
2) Signal before changing lanes
3) Shoulder check
4) Check mirror again then change lanes

EMC/EMI Acronyms

21. August 2015 12:50 by Christian in
ABS Anti-lock Braking System AC Alternating Current ADAS

ABS

Anti-lock Braking System

AC

Alternating Current

ADAS

Advanced Driver Assistance Systems

AFE

Active Front End

ALSE

Absorber Lined ShieldedEnclosure

AM

Amplitude Modulation

AN

Artificial Network

BCI

Bulk Current Injection

BEV

Battery Electric Vehicle

BS

British Standard

C2X

Car infrastructure communications

CAN

Controller Area Network

CARS

Competitive Automotive Regulatory System

CISPR

Comité International Spécialdes Perturbations Radioélectriques

CNS

Central Nervous System

CPT

Contactless Power Transfer

CSA

Canadian Standards Association

CWT

Coaxial Winding Transformer

DC

Direct Current

DSRC

Dedicated Short RangeCommunications

DWPT

Dynamic Wireless Power Transfer

FEV

Fully Electric Vehicle

EAS

Electronic Article Surveillance

EC

European Commission

EC WVTA

EC Whole VehicleType Approval

EM

Electromagnetic

EMC

Electromagnetic Compatibility

EN

European Committee forStandardization

EREV

Extended Range Electric Vehicle

ESA

Electrical/electronic sub-assembly

ESD

Electrostatic Discharge

ESS

Energy Storage System

EU

European Union

EV

Electric Vehicle

EV2SDS

EV to wireless Supply Device Signal

EVCC

Electric Vehicle Communication Controller

EVSE

Electric Vehicle Supply Equipment

FM

Frequency Modulated

HEMIS

Electrical Powertrain Health Monitoring for Increased Safety of FEVs

HEV

Hybrid Electric Vehicle

HV

High Voltage

ICE

Internal Combustion Engine

ICNIRP

International Commission for Non-Ionizing Radiation Protection

INV

Inverter, DC-to-AC Conversion

IEC

International Electro-technical Commission

IGBT

Insulated Gate Bipolar Transistor

I/O

Input / Output

IPT

Inductive Power Transfer

ISO

International Standards Organization

LCL

Inductor–Capacitor–Inductor

LiC

Lithium Capacitor

LISN

Line Impedance Stabilization Network

LPE

Low Power Excitation

LV

Low Voltage

LVD

Low Voltage Directive

LVDWP

Low Voltage Directive Working Party

M1

Category of passenger vehicles having no more than 8 seats in addition to the driver’s seat

MIRA

Motorsport Industry Research Agency

N1

Category of goods vehicleshaving a maximummass of 3.5 tons

OBC

On Board Charger

OATS

Open Area Test Site

OFCOM

Office of Communications

PDCC

Primary Device Communication Controller

PEV

Plug-in Electric Vehicle

PHEV

Plug-in Hybrid Electric Vehicle

PFC

Power Factor Corrector

PHMS

Prognostic Health Monitoring System

PNS

Peripheral NervousSystem

RESS

Rechargeable Energy Storage System

RF

Radio Frequency

RTTE

Radio and Telecommunications Terminal Equipment

SAE

Society of Automotive Engineers (USA)

SAR

Specific Absorption Rate

SBD

Schottky Barrier Diode

SDCC

Secondary Device Communication Controller

SECC

Supply Equipment Communication Controller

SOC

State of charge.

TEM

Transverse Electromagnetic

UNECE

United Nations EconomicCommission for Europe

V2I

Vehicle to Infrastructure

VAR

Volt-Ampere-Reactive

WLN

Wireless Local Network

WPT

Wireless Power Transfer

WPTB

Wireless Charger Base Unit


Electric Field Shielding

14. August 2015 05:17 by Christian in
Types of Electromagnetic Coupling:1) Conducted Coupling2) Electric Field Coupling The Electric

Types of Electromagnetic Coupling: Conducted, Radiation, Magnetic Field, Electric Filed

Electric Field Coupling

The EF lines start on positive charge and end on negative charge from higher voltage conductors to lower voltage conductors. Any two conductors at different potentials (voltages) have electric field lines between them. EF shields are connected to “ground” to maximize their effectiveness.

 

     The electric field lines are passing through ungrounded metallic planes. 

 

Grounding a copper enclosure does not increase or decrease its shielding property but it reduces the crosstalk within the product itself. The ungrounded shield allows coupling signals from circuits within the shielded enclosure. If the device is connected via external cable to another module the ungrounded shield can serve to capacitively couple signals from outside the enclosure. 

Functions provided by MF-WPT system

11. August 2015 10:04 by Christian in
Stand by and Wake up The supply device is woken up by a signal from the EV. Compatibility check C

Stand by and Wake up

The supply device is woken up by a signal from the EV.

Compatibility check

Compatibility of the primary and the secondary devices is checked with the information exchanged at the initialization phase: power classes, operating frequency, magnetic coupling, circuit topology, tuning.

Initial Alignment check

The MF-WPT system will determine that the primary and secondary devices are properly well positioned relative to each other.

Start Power Transfer

The MF-WPT system is capable to transfer the power from the primary device to the secondary device upon the request from the vehicle. The MF-WPT system does not perform power transfer until the command and control communication is properly established and the primary device and secondary device are properly positioned.

Time Scheduled Power Transfer

Perform Power Transfer

MF-WPT system transfers the power from the primary device to the secondary device in accordance with the power demand of the EV. The maximum transferring power of the off-board MF-WPT system must not be exceeded. The vehicle can change the requested transfer power.

Stop Power Transfer

MF-WPT system is able to stop transfer the power from the primary device to the secondary device in accordance with the demand of the EV. The vehicle can requested stop power transfer.

User initiated Stop Power Transfer

MF-WPT system allows the user to terminate of power supply. (e.g. pushing stop button).

Safety monitoring & diagnostics

continuous monitoring of power transfer conditions

continuous monitoring of command & control communication

continuous monitoring of safety conditions

Power Transfer Monitoring: The supply device provide means to verify that the actual output power does not differ from the expected output power by a certain limit; if the limit is exceeded, it shall stop power transfer.

Thermal Monitoring:WPT systems is capable to detect metallic objects and to stop the power transfer.

Live Object Protection: WPT systems provide life object protection by design or may provide means to detect live objects and to stop power transfer.

Failure Conditions:The supply device stops the transfer in case of of power short-circuit, earth leakage, excess temperature, insulation failure, overcurrent, overload conditions.

Ventilation: Verify that the ventilation system of the area is functioning and active.