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Vehicle D namic Control

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- on ro

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rVslip=

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System Components

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Lateral Acceleration Sensor: The lateral acceleration sensor

has similar construction to the deceleration sensor. Rather than

av ng e s p a e sw ng rear o ron , e sensor s moun e n

such a way that the slit plate swings from side to side.

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Semiconductor type deceleration sensors are also available

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Traction Control

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Wheel Speed Control

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AME508ABS/TRAC Actuator

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E ectron c Bra e Force D str ut on EBDF

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Compute by sensing V and

rV

Compute load on the wheel by sensingdeceleration

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Vs p = ,

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ectron c ta ty rogramme

Yaw Control

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Vehicle instability is characterized by Skid, Slide or Spin

Yaw is rotation around the vertical axis; i.e. spinning left orright.

Skidding, Sliding and Spinning of vehicle may happen dueto panic braking, high speed cornering, loss of traction and

due to d namic transient maneuverin Vehicle stability control systems must help drivers maintain

control when a vehicle starts to skid, slide or spin

S ng emo w ee oc ngSliding Demo steering (Over Steering)

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Electronic Stabilit control ESC is a technolo thatimproves the safety of a vehicle's handling by detecting and

preventing skids

,applies individual brakes to help "steer" the vehicle where thedriver wants to go.

ra ng s au oma ca y app e o n v ua w ee s, suc asthe outer front wheel to counter oversteer, or the inner rearwheel to counter understeer.

Some ESC systems also reduce engine power until control isregained

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Electronic Stability Control (ESC)

Electronic Stability Control (ESC) is the generic term for systemsdesigned to improve a vehicle's handling, particularly at the limitswhere the driver mi ht lose control of the vehicle

Other nomenclatures

Vehicle Dynamics Control (VDC)

Electronic Stability Program (ESP)

Vehicle Stability Assist(VSA)

Direct yaw moment control (DYC)

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V hi l St bilit C t l Al ith

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Vehicle Stability Control - Algorithm

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Fig: 8.5

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Wheel-speed sensors: One wheel-speed sensor at each wheelmeasures the speed of the wheel which the computer can then

compare to the speed of the engine. - , ,

measures the direction the driver intends to aim the car. If it'sdifferent than the direction the car is actually traveling, the

. Rotational-speed sensor: This is also known as the yaw sensor.

It's the one in the middle of the car that measures the side-to-.

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Operation Oversteer Control

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Operation-Oversteer Control

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Operation-Understeer Control

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Standing Start Slip Control

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Braking Control Under Cornering

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1 Y i h

ESP Control Loop

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1. Yaw-rate sensor with

lateral-acceleration

sensor

2. Steering-wheel-angle

sensor

3. Primary-pressure

sensor

4. Wheel-speed sensor

5. ESP control unit

6. Hydraulic modulator

7. Wheel brakes

8. Engine management

9. Fuel injection only

for gasoline engine:

10. Ignition-timingintervention

11. Throttle-valve

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intervention (ETC)

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