1. Embedded Control Systems Anti-Lock Braking System
Sai & Preetham
Cpsc 875
Project : 1
Embedded Control Systems
Anti-Lock Braking System
Architecture
Team:
Sai Madhavapeddi
Preetham K Yellambalase

2. Why ABS System
Common safety feature
Prevents Skidding
Optimal braking force
Complete steering control

3. Block Diagram of the ABS system
Brake
Ignition
Tester
ABS Controller
Input Interface
Output Interface
Fluid Reservoir
Wheel Speed Sensor
Error Lamp
Main Computer
Brake On/Off
Power On/Off
System Test Info
Speed
Pressure Difference
Increase/
Decrease Pressure
On/Off
Error Log

4. Business Qualities
The system must be able to accept commercially available software components.These components can range from a complete subsystem to a single unit of implementation in the system. This would indirectly benefit the time to market for the system.
The system should be able to handle upgrades in hardware such as a change in controller, and also in software. This would enhance the systems modifiability.
The system should be built in such a way that it could be deployed on vehicles from a broad range of makes and models. Although this would increase the time to develop the system, it would enhance the market area for the product.
The system must be able to interact with a wide range of other systems that constitute an automobile.

5. Class Diagram for the ABS System

6. Sequence diagram for Normal operation of ABS System

7. ABSSystem Interface Resource Syntax void reset()
void calculateDeceleration(WheelType wheel)
void pumpBrake(WheelType wheel)
void disableABS()
void enableABS()
void waitOnBrake()
ErrorLog sendErrorInfo()

8. State Diagram for ABSSystem

9. Tester Interface Resource Syntax boolean fullSystemTest()
boolean basicSystemTest()

10. State Diagram for Tester Class

11. Brake Interface
Resource Syntax
void applyBrake()
boolean ifOn()

12. State Diagram for Brake Class

13. WheelSpeedSensor Interface
Resource Syntax
float getWheelSpeed()

14. State Diagram for WheelSpeedSensor Class

15. ErrorLamp Interface Resource Syntax void setErrorLamp()
void resetErrorLamp()
boolean ifOn()

16. State Diagram for ErrorLamp

17. FluidReservoir Interface
Resource Syntax
void increasePressure(WheetType wheel, int x)
void decreasePressure(WheelType wheel, int x)
float calcPressureDiff(WheelType wheel)

18. State Diagram for FluidReservoir

19. EventHandler Interface
Resource Syntax
void powerOn()
void powerOff()
void brakeOn()
void brakeOff()