AUTOTRONICS:IMPROVING VEHICLE PERFORMANCE

AUTOTRONICS IN A VIEW

INTRODUCTION

AUTOTRONICS= AUTOMOBILE + ELECTRONICS

First electronic part in an automobile was called an ECU (Engine control unit).

Analysts estimate that more than 80 percent of all automotive innovation now stems from electronics

HISTORY

TIMELINE

1970s: Introduction of electronics for engine controls 1980s: Anti-lock braking introduced Early 1990s: Airbags become standard Late 1990s: Rapid expansion of body electronics seat motors (body Computers), instrument panel lighting, auto locking systems and keyless entry Early 2000s to date: infotainment, including sophisticated audio and video ; Signals sent via

satellite (such as the OnStar System); GPS and mapping Capabilities; satellite radio

Late 2000s: Steer-by-wire, wireless connectivity

This seminar describes automobile applications of autotronics in following domains:

Braking system

Steering system

Suspension system

Transmission system

Engine (fuel intake)

Braking system

EBS increases traffic safety through reduced stopping distance and improved brake stability.

Functions in ECB:

Anti-lock braking system (ABS):

Traction control system (TCS)

Brake lining wear control

ABS

ABS is an acronym for anti-lock braking system. First developed and patented in 1936, ABS is actually derived

from the German term "anti blockier system." Anti-lock brakes are designed to prevent skidding and help

drivers maintain steering control during an emergency stopping situation

Difference between ABS & Traction Control

ABS Manage the grip of the tires for braking maneuver

Traction Control Manage the grip of the tires for accelerating maneuver

STEERING SYSTEM

The self-alignment estimation control uses both the EPS sensor information and internally programmed EPS

control

Speed sensitive steering system:

Speed sensitive steering system is used to control the power steering pump pressure in relation to vehicle

speed. Below 10mph (16km/h) the computer operates the steering. This action reduces the steering effort during

low speed maneuver and parking.

Electrically powered steering uses an electric motor to drive either the power steering hydraulic pump or the

steering directly.

Steering sensor" is located on the input shaft where it enters the gearbox housing.

An interface circuit that same housing converts the signals from the torque sensor and rotation sensor into

signals.

The vehicle motion estimation control uses the steering angular velocity information internally programmed in

the EPS system.

This control helps improve yaw damping of the vehicle at higher speeds on the road.

Sensors

Accelerating sensor, displacement sensors, Steering wheel position

SUSPENSION SYSTEM

Suspension systems in most vehicles on the road today are passive.

Shock absorbers help to dissipate the energy applied to the springs and damp the oscillations.

Active Roll Control Systems:

Vehicles lean when cornering due to the weight transfer imposed by lateral acceleration. Factors contributing to

the roll angle of the vehicle include vehicle height and suspension stiffness.

ARC system uses hydraulic and electronic technology to the vehicle roll angle in cornering, which improves

handling.

The active roll control system contains

Control module, Accelerometer, Speed sensor, Fluid reservoir, Electro hydraulic pump, Pressure control valve,

Directional control valve.

A hydraulic actuator in both the front and rear stabilizer bars

TRANSMISSION SYSTEM

Mainly it controls the shifting process of the gears.

Electronically controlled transmissions were introduced on BMW products in 1986 on 5 and7 series vehicles.

The TCM also adapts to changing conditions within the transmission by monitoring slip ratios.

The TCM controls the operation of the Lock-Up Torque Converter which further increases economy.

ADVANTAGES:

Increased fuel economy

Improved shift comfort

Increased driving safety

Electronic Fuel Injection

EFI system electronically meters the fuel so that the exact amount needed is provided to the engine.

EFI uses to fuel to power the engine by pumping it forcibly by using high pressure through a small nozzle or

valve.

A high-pressure fuel pump that produces high fuel pressures (5 to 12 MPa)

ADAPTIVE CRUISE CONTROL

It automatically adjusts the vehicle speed and distance to that of a target vehicle.

ACC uses a long range radar sensor to detect a target vehicle up to 200 meters in front of vehicle.

As per standard cruise control the driver can override the system at any time.

Another advantage of this system is that the driver will not exceed the speed limit on the highway.

Airbags

The air bag technology is based on electronic sensors that measure the amount of quick deceleration through an

accelerometer

The new calculations will take into account the position of the seats, the use of a seat belt and the weight of the

occupants

Latest research

Active bumper system,

Active hood lift system,

Vehicle to vehicle communication

Camber thrust in F 1 vehicles

Global Positioning System

Rain sensing wipers

Adaptive light system