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BMCA 4653

VEHICLE CONTROLSYSTEM

Lecturer: Dr. Khisbullah Hudha

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Course Content

• Chapter 1: Introduction to Vehicle Control System (1)• Chapter 2: Active Front Wheel Steer System (AFS) (1)

Chapter 3: Antilock Braking System (ABS) & MR Brake (2)

• Chapter 4: CVT Control (1)

•

Chapter 5: Active Four Wheel Steer System (4WS) (1)• Chapter 6: Active & Semi Active Suspension System (2)

• Chapter 7: Active Roll Control Suspension System (ARC) (2)

• Chapter 8: Active Engine Mounting System (1)

•

Chapter 9: Adaptive Cruise Control (ACC) (1)• Chapter 10: Vehicle to Vehicle (V2V) Communication (1)

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COURSE IMPLEMENTATION

• LECTURE: 2 HOURS PER WEEK FOR 14 WEEKS

• TUTORIALS: 2 HOURS PER WEEK FOR 14 WEEKS

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COURSE EVALUATION

• MID TEST: 15%

• FINAL TEST: 50%

•

QUIZ (2X): 10%• ASSIGNMENTS (3X): 10%

• PROJECT: 15%

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REFERENCES

• RAJAMANI, R. (2005). VEHICLE DYNAMICS AND

CONTROL. SPRINGER.

(can be downloaded at the following URL:http://enlightenments.wordpress.com/2009/01/05/automotive-control-system/ )

• Kiencke, U. and Nielsen, L. (2004). Automotive ControlSystem. Springer Verlag: New York, LLC.

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Chapter 1

Introduction to Vehicle ControlSystem

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Introduction

• What is control system?

- device or set of devices to manage,command, direct or regulate the behaviorof other devices or system.

- 2 common type of control system:

(a) logic or sequential controls(b) feedback or linear controls

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Component of control system

• Reference

• Comparator

•

Feedback• Controller

• Actuator

• Plant to be control• External disturbance

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Control Structure

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Active Front Wheel Steering

Control (AFS)• Electronic control system in automobile

used to eliminate the effects of unwantedyaw disturbance.

• Disturbance occur due to:

(a) side wind force(b) road friction

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Anti Braking System (ABS)

• Anti-lock brakes are designed to prevent wheelfrom locking while braking.

• help drivers maintain steering control during anemergency stopping situation.

• In cars equipped with conventional brakes, the

driver pumps the brakes, whereas in carsequipped with four-wheel ABS, the driver keepsa firm foot on the brake, allowing the system torapidly and automatically pump the brakes.

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Traction Control

• Traction Control is used to prevent the drivewheels from losing grip when accelerating.

• Traction control is an enhancement of ABS thatcan also be used to balance the traction torquesin all drive wheels

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What is the difference betweenABS & Traction Control?

• ABS

manage the grip of the tires for brakingmaneuver

• Traction Control

manage the grip of the tires foraccelerating maneuver

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Magnetorheological (MR) Brake

System

• Will covered about the magnetorheological

(MR) brake system that has betterperformance compare to the conventionalhydraulic brake system.

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Four Wheel Steering (4WS)

• System employed by some vehicles toimprove steering response.

• Also increase vehicle stability whilemaneuvering at high speed or to decreaseturning radius at low speed.

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Active Engine Mounting System

• Used to isolate vehicle body from enginevibrations.

• Engine vibrations is mainly caused byunbalance mass rotation of crank shaft.

• Mainly consists of:

(a) Rubber engine mounting system(b) Hydraulic engine mounting system

(c) active engine mounting system

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Active Suspension Control

• Active Suspension

- Hydraulic

- Pneumatic

• Semi-Active Suspension

- Variable orifice- MR fluid

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ARC

• Vehicles lean when cornering due to the weighttransfer imposed by lateral acceleration actingon the suspension. Factors contributing to theroll angle of the vehicle include vehicle heightand suspension stiffness.

• ARC system uses hydraulic/pneumatic and

electronic technology to reduce or eliminate thevehicle roll angle in cornering, which improveshandling. This improvement to vehicle handlingcan help reduce rollover risk.

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ARC System

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Adaptive Cruise Control

Adaptive Cruise Control (ACC) technologyautomatically adjust the vehicle speed and distanceto that of a target vehicle. ACC uses a long rangeradar sensor to detect a target vehicle up to 200

meters in front and automatically adjusts the ACCvehicle speed and gap accordingly.

ACC automatically decelerates or accelerates thevehicle according to the desired speed and distancesettings established by the driver. As per standardcruise control the driver can override the system at

any time.

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X-by Wire

• X-by wire: replace mechanical system inautomobile with electrical system for fasterresponse, easier to control and lighter

vehicle total weight

• The most common x-by-wire technologyavailable in the market are brake by wire &steer by wire