IT in automobile

Abon

The name stands for…

Automotive open system architecture

Japan automotive software

platform architecture.

Background

• An alliance of OEM manufacturers and Tier 1 automotive suppliers

in August, 2002 and the partners were joined soon afterwards by

Technology overview

ECU(engine control unit)

• The ECU uses closed-loop control, a control scheme that monitors outputs of a system to control the inputs to a system, managing the emissions and fuel economy of the engine

• Gathering data from dozens of different sensors, the ECU knows everything from the coolant temperature to the amount of oxygen in the exhaust. With this data, it performs millions of calculations each second, including looking up values in tables, calculating the results of long equations to decide on the best spark timing and determining how long the fuel injector is open. The ECU does all of this to ensure the lowest emissions and best mileage.

Software component

A fundamental design concept of AUTOSAR is the separation between:

• application

• infrastructure

“Atomic Software Component".

It cannot be distributed over several AUTOSAR ECUs

RTE

• AUTOSAR Runtime Environment (RTE) acts as a communication center for inter- and intra-ECU information exchange

• RTE provides a communication abstraction to AUTOSAR Software Components attached to it by providing the same interface and services whether inter-ECU communication channels are used (such as CAN, LIN, FlexRay, MOST, etc.) or communication stays intra-ECU.

Flexray ~communication system for automobile

• Fault-tolerant clock synchronization via a global time base

• Collision-free bus access

• Guaranteed message latency

• Message oriented addressing via identifiers

• Scalable system fault-tolerance via the support of either single or dual channels

Controller Area Network BUS

• A low speed CANbus may be employed to operate window and seat controls.

• A high speed CANbus may be employed for engine management or brake control.

Media Oriented Systems Transport

• POF( Plastic optical fiber)-based ~ largely immune to electromagnetic interference.

• First deployed in 2001 BMW exclusive 7 series to achieve 5.6 Mb transmission rate.

AUTOSAR Basic Software

• Microcontroller AbstractionAccess to the hardware is routed through the Microcontroller Abstraction layer (MCAL) to avoid direct access to microcontroller registers from higher-level software.MCAL is a hardware specific layer that ensures a standard interface to the components of the Basic Software. It manages the microcontroller peripherals and provides the components of the Basic Software with microcontroller independent values. MCAL implements notification mechanisms to support the distribution of commands, responses and information to different processes.

Conclusion

• Currently, vendors in Taiwan can not get involved in the standard.

• Most of products from Taiwan are peripheral