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Automotive (Control) Systems

Behzad
February 04, 2013
47

Automotive (Control) Systems

This presentation is an overview of chassis subsystems and related modern control systems.

Behzad

February 04, 2013
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Transcript

  1. Industrial Control Behzad Samadi Department of Electrical Engineering Amirkabir University

    of Technology Winter 2009 Tehran, Iran Behzad Samadi (Amirkabir University) Industrial Control 1 / 86
  2. Shock Absorbers (Dampers) Single tube: 1 Atmospheric pressure 2 Valve,

    soft spring 3 Valve, hard spring 4 Non-return valve [Bosch, 2007] Behzad Samadi (Amirkabir University) Industrial Control 4 / 86
  3. 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 in locations where space is limited. This shock-absorber type is short, as the balance chamber is next to the working cylinder. [Bosch, 2007] Behzad Samadi (Amirkabir University) Industrial Control 5 / 86
  4. Shock Absorbers (Dampers) Force velocity diagram [Reimpell et al., 1995]

    Behzad Samadi (Amirkabir University) Industrial Control 6 / 86
  5. Shock Absorbers (Dampers) Force displacement diagram [Reimpell et al., 1995]

    Behzad Samadi (Amirkabir University) Industrial Control 7 / 86
  6. Level Control System Air suspension: 1 Air connection 2 Steel

    spring 3 Auxiliary air-spring element 4 Gas volume 5 Shock absorber [Bosch, 2007] Behzad Samadi (Amirkabir University) Industrial Control 8 / 86
  7. 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] Behzad Samadi (Amirkabir University) Industrial Control 9 / 86
  8. Power Steering System Electrohydraulic: [Reimpell et al., 1995] Behzad Samadi

    (Amirkabir University) Industrial Control 16 / 86
  9. Vacuum Booster and Master Cylinder Assembly [Limpert, 1992] Behzad Samadi

    (Amirkabir University) Industrial Control 23 / 86
  10. Brake System Main factors affecting the overall gain: Pedal conversion

    Boost factor Diaphragm surface area Vacuum pressure Surface area of master cylinder [Bosch, 2007] Behzad Samadi (Amirkabir University) Industrial Control 29 / 86
  11. Proportioning Valve Load-sensitive brake force reducing valve: The cut-in pressure

    is altered to correspond to the vehicle’s load by means of a mechanical device which transmits the relative movement between axle and vehicle body to the step-bore piston in the valve. The force acting on the step-bore piston during braking is again modified by the dynamic axle load transfer and thus influences the braking force on the rear axle. This guarantees maximum deceleration while at the same time largely preventing locking of the rear axle and the resulting danger of skidding. conti-online.com Behzad Samadi (Amirkabir University) Industrial Control 34 / 86
  12. Air Brake System Why air brakes? Air brake systems are

    more tolerant to small leaks. The smallest leak in a hydraulic system could result in brake failure. An air brake system includes a compressor to generate more compressed air as needed. icbc.com Behzad Samadi (Amirkabir University) Industrial Control 36 / 86
  13. Air Brake System The compressor will continue to pump air,

    but all of its output will take the path of least resistance and be vented at the line rupture. icbc.com Behzad Samadi (Amirkabir University) Industrial Control 53 / 86
  14. Air Brake System Once the supply line is connected to

    the trailer, there needs to be a way of directing air pressure to the trailer. icbc.com Behzad Samadi (Amirkabir University) Industrial Control 67 / 86
  15. Air Brake System There are times when it may be

    benefi cial to apply only the trailer brakes with out applying the tractor brakes, such as when coupling the tractor to a trailer. icbc.com Behzad Samadi (Amirkabir University) Industrial Control 68 / 86
  16. Antilock Braking System (ABS) Reduce stopping distance Maintain steerablity Maintain

    lateral stability bosch.de Behzad Samadi (Amirkabir University) Industrial Control 73 / 86
  17. Antilock Braking System (ABS) Maximize tire-road adhesion with wheel slip

    control [Bosch, 2007] Behzad Samadi (Amirkabir University) Industrial Control 74 / 86
  18. Antilock Braking System (ABS) ABS components: Electronic Control Unit Hydraulic

    Modulator Wheel Speed Sensors conti-online.com and bosch.de Behzad Samadi (Amirkabir University) Industrial Control 76 / 86
  19. Antilock Braking System (ABS) ABS MK20: Samand, Peugeot, Citroen, VW,...

    conti-online.com Behzad Samadi (Amirkabir University) Industrial Control 78 / 86
  20. Antilock Braking System (ABS) Bosch ABS5: Hinten (rear), Vor (front),

    Richtig (right), Linke (left) [Bosch, 2007] Behzad Samadi (Amirkabir University) Industrial Control 79 / 86
  21. Antilock Braking System (ABS) ABS MK20: Hinten (rear), Vor (front),

    Richtig (right), Linke (left) [Bosch, 2007] Behzad Samadi (Amirkabir University) Industrial Control 80 / 86
  22. Electronic Stability Program (ESP) Vehicle lateral variables: Yaw rate Sideslip

    angle (β) [Bosch, 2007] Behzad Samadi (Amirkabir University) Industrial Control 81 / 86
  23. Electronic Stability Program (ESP) ESP components: Wheel speed sensors (A)

    Steering angle sensor (B) Combined yaw rate sensor/lateral accelerometer (C) Electronic Control Unit (ECU) (D) Hydraulic unit (E) Motor (F) Pressure sensor (G) bosch.de and edmunds.com Behzad Samadi (Amirkabir University) Industrial Control 84 / 86
  24. 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