industrial control systems - automotive systems
DESCRIPTION
TRANSCRIPT
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Industrial Control
Behzad Samadi
Department of Electrical EngineeringAmirkabir University of Technology
Winter 2009Tehran, Iran
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Car Suspension
Howstuffworks.com
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Shock Absorbers (Dampers)
Howstuffworks.com
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Shock Absorbers (Dampers)
Single tube:
1 Atmospheric pressure
2 Valve, soft spring
3 Valve, hard spring
4 Non-return valve
[Bosch, 2007]
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Shock Absorbers (Dampers)
Twin tube:
1 Atmospheric pressure
2 Reserve chamber
3 Base valve
Advantages: Insensitive to stone throw. Tube can be adapted to fit inlocations where space is limited. This shock-absorber type is short, as thebalance chamber is next to the working cylinder.[Bosch, 2007]
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Shock Absorbers (Dampers)
Force velocity diagram[Reimpell et al., 1995]
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Shock Absorbers (Dampers)
Force displacement diagram[Reimpell et al., 1995]
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Level Control System
Air suspension:
1 Air connection
2 Steel spring
3 Auxiliary air-spring element
4 Gas volume
5 Shock absorber
[Bosch, 2007]
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Level Control System
Hydropneumatic suspension:
1 Fluid supply
2 Steel spring
3 Accumulator
4 Gas volume
5 Rubber diaphragm
6 Fluid
7 Hose
8 Shock absorber
System reacts to increased vehicle speed by reducing body ride height, resulting in
fuel savings
Increase in vehicle-body ride height on poor road surfaces
Enhanced stability in curves achieved through lateral blocking of the suspension
elements on a given axle
[Bosch, 2007]
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Roll Control System
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Semi-active Suspension System
Magnetorheological (MR) fluid:
MR damper:
lord.comBehzad Samadi (Amirkabir University) Industrial Control 11 / 86
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Steering System
Rack and pinion:
Howstuffworks.com
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Power Steering System
[Reimpell et al., 1995]Behzad Samadi (Amirkabir University) Industrial Control 13 / 86
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Power Steering System
Power rack:
Howstuffworks.com
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Power Steering System
Rotary vane pump:
Howstuffworks.com
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Power Steering System
Electrohydraulic:
[Reimpell et al., 1995]
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Power Steering System
Electrohydraulic:
[Bosch, 2007]
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Electric Power Steering System
delphi.com
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Electric Power Steering System
delphi.com
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Steer by Wire
delphi.com
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Four Wheel Steering
delphi.com
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Brake System
cartechservice.com
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Vacuum Booster and Master Cylinder Assembly
[Limpert, 1992]
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Master Cylinder
Howstuffworks.com
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Vacuum Booster and Master Cylinder Assembly
carbibles.com
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Dual Hydraulic Circuit
carbibles.com
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Hydraulic Leverage
Howstuffworks.com
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Simple Brake System
Howstuffworks.com
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Brake System
Main factors affecting the overall gain:
Pedal conversion
Boost factor
Diaphragm surface area
Vacuum pressure
Surface area of master cylinder
[Bosch, 2007]
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Disk Brakes
carbibles.com
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Drum Brakes - Single Leading Edge
carbibles.com
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Drum Brakes - Double Leading Edge
carbibles.com
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Diagonally Split Circuit
conti-online.com
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Proportioning Valve
Load-sensitive brake force reducing valve:
The cut-in pressure is altered to correspond to the vehicle’s load bymeans of a mechanical device which transmits the relative movementbetween axle and vehicle body to the step-bore piston in the valve.
The force acting on the step-bore piston during braking is againmodified by the dynamic axle load transfer and thus influences thebraking force on the rear axle.
This guarantees maximum deceleration while at the same time largelypreventing locking of the rear axle and the resulting danger ofskidding.
conti-online.com
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Proportioning Valve
centricparts.com
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Air Brake System
Why air brakes?
Air brake systems are more tolerant to small leaks. Thesmallest leak in a hydraulic system could result in brakefailure. An air brake system includes a compressor togenerate more compressed air as needed.
icbc.com
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Air Brake System
icbc.comBehzad Samadi (Amirkabir University) Industrial Control 37 / 86
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Air Brake System
icbc.comBehzad Samadi (Amirkabir University) Industrial Control 38 / 86
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
The compressor will continue to pump air, but all of its output willtake the path of least resistance and be vented at the line rupture.
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
Once the supply line is connected to the trailer, there needs to be away of directing air pressure to the trailer.
icbc.com
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Air Brake System
There are times when it may be benefi cial to apply only the trailerbrakes with out applying the tractor brakes, such as when couplingthe tractor to a trailer.
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Air Brake System
icbc.com
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Antilock Braking System (ABS)
Reduce stoppingdistance
Maintain steerablity
Maintain lateral stability
bosch.de
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Antilock Braking System (ABS)
Maximize tire-road adhesion with wheel slip control
[Bosch, 2007]
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Antilock Braking System (ABS)
[Bosch, 2007]
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Antilock Braking System (ABS)
ABS components:
Electronic Control Unit
Hydraulic Modulator
Wheel Speed Sensors
conti-online.com and bosch.de
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Antilock Braking System (ABS)
howstuffworks.com
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Antilock Braking System (ABS)
ABS MK20: Samand, Peugeot, Citroen, VW,...
conti-online.com
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Antilock Braking System (ABS)
Bosch ABS5:
Hinten (rear), Vor (front), Richtig (right), Linke (left)
[Bosch, 2007]
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Antilock Braking System (ABS)
ABS MK20:
Hinten (rear), Vor (front), Richtig (right), Linke (left)
[Bosch, 2007]
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Electronic Stability Program (ESP)
Vehicle lateral variables:
Yaw rate
Sideslip angle (β)
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Electronic Stability Program (ESP)
bosch.de
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Electronic Stability Program (ESP)
[Bosch, 2007]
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Electronic Stability Program (ESP)
ESP components:
Wheel speed sensors (A)
Steering angle sensor (B)
Combined yaw ratesensor/lateralaccelerometer (C)
Electronic Control Unit(ECU) (D)
Hydraulic unit (E)
Motor (F)
Pressure sensor (G)bosch.de and edmunds.com
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Electronic Stability Program (ESP)
[Bosch, 2007]
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Brake by Wire
Siemens VDO:
vdo.com
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Bosch, R., editor (2007).Bosch Automotive Handbook.Wiley, 7 edition.
Limpert, R. (1992).Brake Design and Safety.Society of Automotive Engineers Inc.
Reimpell, J., Stoll, H., and Betzler, J. W. (1995).The Automotive Chassis: Engineering Principles.Arnold.
Behzad Samadi (Amirkabir University) Industrial Control 86 / 86