Automobile Electronics Pdf

Automotive Electrical Systems Pdf
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Automobile Electronics Pdf File
Automobile Systems Pdf

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Automotive electronics are electronic systems used in vehicles, including engine management, ignition, radio, carputers, telematics, in-car entertainment systems and others. Ignition, engine, and transmission electronics are also found in trucks, motorcycles, off-road vehicles, and other internal combustion-powered machinery such as forklifts, tractors, and excavators. Related elements for control of relevant electrical systems are found on hybrid vehicles and electric cars as well.

Electronic systems have become an increasingly large component of the cost of an automobile, from only around 1% of its value in 1950 to around 30% in 2010.^[1]

The earliest electronics systems available as factory installations were vacuum tubecar radios, starting in the early 1930s. The development of semiconductors after WWII greatly expanded the use of electronics in automobiles, with solid-state diodes making the automotive alternator the standard after about 1960, and the first transistorized ignition systems appearing about 1955.

The development of integrated circuits and microprocessors made a range of automotive applications economically feasible in the 1970s. In the early 1970s, the Japanese electronics industry began producing integrated circuits and microcontrollers for the Japanese automobile industry, used for in-car entertainment, automatic wipers, electronic locks, dashboard, and engine control.^[2] The Ford EEC (Electronic Engine Control) system, which utilized the Toshiba TLCS-12 microprocessor, went into mass production in 1975.^[3] In 1978, the Cadillac Seville fetured a 'trip computer' based on a 6802 microprocessor. Electronically-controlled ignition and fuel injection systems allowed automotive designers to achieve vehicles meeting requirements for fuel economy and lower emissions, while still maintaining high levels of performance and convenience for drivers. Today's automobiles contain a dozen or more processors, in functions such as engine management, transmission control, climate control, antilock braking, passive safety systems, navigation, and other functions.^[4]

Modern electric cars rely on power electronics for the main propulsion motor control, as well as managing the battery system. Future autonomous cars will rely on powerful computer systems, an array of sensors, networking, and satellite navigation, all of which will require electronics.

1Types

Types[edit]

Automotive electronics or automotive embedded systems are distributed systems, and according to different domains in the automotive field, they can be classified into:

Engine electronics[edit]

One of the most demanding electronic parts of an automobile is the engine control unit (ECU). Engine controls demand one of the highest real time deadlines, as the engine itself is a very fast and complex part of the automobile. Of all the electronics in any car the computing power of the engine control unit is the highest, typically a 32-bit processor.^{[citation needed]}

A modern car may have up to 100 ECU's and a commercial vehicle up to 40.^{[citation needed]}

An engine ECU controls such functions as:

In a diesel engine:

Fuel injection rate
Emission control, NOx control
Regeneration of oxidation catalytic converter
Turbocharger control
Cooling system control
Throttle control

In a gasoline engine:

Lambda control
OBD (On-Board Diagnostics)
Cooling system control
Ignition system control
Lubrication system control (only a few have electronic control)
Fuel injection rate control
Throttle control

Many more engine parameters are actively monitored and controlled in real-time. There are about 20 to 50 that measure pressure, temperature, flow, engine speed, oxygen level and NOx level plus other parameters at different points within the engine. All these sensor signals are sent to the ECU, which has the logic circuits to do the actual controlling. The ECU output is connected to different actuators for the throttle valve, EGR valve, rack (in VGTs), fuel injector (using a pulse-width modulated signal), dosing injector and more. There are about 20 to 30 actuators in all.

Transmission electronics[edit]

These control the transmission system, mainly the shifting of the gears for better shift comfort and to lower torque interrupt while shifting. Automatic transmissions use controls for their operation, and also many semi-automatic transmissions having a fully automatic clutch or a semi-auto clutch (declutching only). The engine control unit and the transmission control exchange messages, sensor signals and control signals for their operation.

Chassis electronics[edit]

The chassis system has a lot of sub-systems which monitor various parameters and are actively controlled:

ABS - Anti-lock Braking System
TCS – Traction Control System
EBD – Electronic Brake Distribution
ESP – Electronic Stability Program
PA - Parking Assistance

Passive safety[edit]

These systems are always ready to act when there is a collision in progress or to prevent it when it senses a dangerous situation:

Air bags

Driver assistance[edit]

Lane assist system
Speed assist system
Blind spot detection
Park assist system
Pre-collision Assist

Passenger comfort[edit]

Automatic climate control
Electronic seat adjustment with memory
Automatic wipers
Automatic headlamps - adjusts beam automatically
Automatic cooling - temperature adjustment

Entertainment systems[edit]

Automotive Electrical Systems Pdf

All of the above systems forms an infotainment system. Developmental methods for these systems vary according to each manufacturer. Different tools are used for both hardware and software development.

Electronic Integrated Cockpit systems[edit]

These are new generation hybrid ECUs that combine the functionalities of multiple ECUs of Infotainment Head Unit, Advanced Driver Assistance Systems (ADAS), Instrument Cluster, Rear Camera/Parking Assist, Surround View Systems etc. This saves on cost of electronics as well as mechanical/physical parts like interconnects across ECUs etc. There is also a more centralized control so data can be seamlessly exchanged between the systems.

There are of course challenges too. Given the complexity of this hybrid system, a lot more rigor is needed to validate the system for robustness, safety and security. For example, if the infotainment system's application which could be running an open source Android OS is breached, there could be possibility of hackers to take control of the car remotely and potentially misuse it for anti social activities. Typically so, usage of a hardware+software enabled hypervisors are used to virtualize and create separate trust and safety zones that are immune to each other's failures or breaches. Lot of work is happening in this area and potentially will have such systems soon if not already.

Functional safety requirements[edit]

In order to minimize the risk of dangerous failures, safety related electronic systems have to be developed following the applicable product liability requirements. Disregard for, or inadequate application of these standards can lead to not only personal injuries, but also severe legal and economic consequences such as product cancellations or recalls.

The IEC 61508 standard, generally applicable to electrical/electronic/programmable safety-related products, is only partially adequate for automotive-development requirements. Consequently, for the automotive industry, this standard is replaced by the existing ISO 26262, currently released as a Final Draft International Standard (FDIS). ISO/DIS 26262 describes the entire product life-cycle of safety related electrical/electronic systems for road vehicles. It has been published as an international standard in its final version in November 2011. The implementation of this new standard will result in modifications and various innovations in the automobile electronics development process, as it covers the complete product life-cycle from the concept phase until its decommissioning.

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Security[edit]

As more functions of the automobile are connected to short- or long-range networks, cybersecurity of systems against unauthorized modification is required. With critical systems such as engine controls, transmission, air bags, and braking connected to internal diagnostic networks, remote access could result in a malicious intruder altering the function of systems or disabling them, possibly causing injuries or fatalities. Every new interface presents a new 'attack surface'. The same facility that allows the owner to unlock and start a car from a smart phone app also presents risks due to remote access. Auto manufacturers may protect the memory of various control microprocessors both to secure them from unauthorized changes and also to ensure only manufacturer-authorized facilities can diagnose or repair the vehicle. Systems such as keyless entry rely on cryptographic techniques to ensure 'replay' or 'man-in-the-middle attacks' attacks cannot record sequences to allow later break-in to the automobile. ^[5]

In 2015 the German general automobile club commissioned an investigation of the vulnerabilities of one manufacturer's electronics system, which could have led to such exploits as unauthorized remote unlocking of the vehicle. ^[6]

References[edit]