sensor presentation akhil short
TRANSCRIPT
-
8/3/2019 Sensor Presentation Akhil Short
1/16
Presented By -
Akhil Sharma
Deep Lomesh Shah
Technische Universitt Chemnitz
Master Micro and Nano Systems
Second Semester
Sensors For Active And Passive Security System
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
-
8/3/2019 Sensor Presentation Akhil Short
2/16
2
Sensors For Active And Passive Security System
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
There are two main types of security systems
Active security system Passive security system
Active security systems They work for prevention of crash/accident.e.g. ESP , ABS, ACC, TCS, TPM, EBD, CBC, Headlights, Reflectors,Suspensions, Infrared night vision etc.
Passive security systems They work after the crash has taken placee.g. airbags, seatbelts, laminated windshield, crumple zones, PPS, paddingthe instrumental panel etc.
0
Source : Jeopardylabs.com
Source : Google Image
-
8/3/2019 Sensor Presentation Akhil Short
3/16
-
8/3/2019 Sensor Presentation Akhil Short
4/16
4
Anti-Lock Braking System (ABS)
What is ABS ? An anti-lock braking system is a safety system that allows the wheels on
a motor vehicle to continue interacting tractively with the road surface as directedby driver steering inputs while braking.
Therefore, preventing the wheelsfrom locking (that is ceasing rotation)and therefore avoiding skidding.
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
Source : www.carazoo.com
-
8/3/2019 Sensor Presentation Akhil Short
5/16
5
Components Of ABS
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
ABS
Wheel SensorABS Control
Module
Hydraulic Pumpand Pressure
Release Valves
Brake Pipe
ABS comprises of following -
-
8/3/2019 Sensor Presentation Akhil Short
6/16
6
Components Of ABS
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
Wheel sensors The speed sensors, which are located at each wheel provideinformation to ABS control module when a wheel is about to lock up.
.ABS Control Module It is an ECU type unit in the car/vehicle which receivesinformation from each individual wheel speed sensor. When a wheel loses tractionthe signal is sent to the controller, the controller will then limit the brake force
(EBD) and activate the ABS modulator which actuates the braking valves on andoff.
Valves There is a valve in the brake pipe of each brake controlled by the ABS.
Pump When a valve reduces the pressure in a pipe, the pump maintains thepressure back to the normal in the pipe.
-
8/3/2019 Sensor Presentation Akhil Short
7/16
7
Schematic showing ABS inside a vehicle
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
A : Wheel sensor
B : ABS controlmodule
C : Hydraulic pump &
pressure releasevalves
D : Brake pipe
-
8/3/2019 Sensor Presentation Akhil Short
8/16
8
Operation Principle
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
STEP 1: Heavy brakes applied, observe green wheel(A).
STEP 2: ABS control module(B) activated, signal sent to brake pressurevalve(C) to lower the pressure in the corresponding brake pipe(D).
STEP 3: Lowering of pressure in brake pipe(D),causing brake caliper toloosen the grip.
1. Brake caliper
2. Wheel speed sensor
STEP 4: Pressure built up again using hydraulic pump (C).
-
8/3/2019 Sensor Presentation Akhil Short
9/16
9
Sensors For Active And Passive Security System
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
.A) Example : Car without ABS onslippery surface.
Without ABS, as driver applies brakes,wheels lock (1). Despite applyingsteering lock, car continues straightahead due to the loss of steeringcontrol (2) and a collision results.
-
8/3/2019 Sensor Presentation Akhil Short
10/16
10
Sensors For Active And Passive Security System
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
.A) Example : Car with ABS on slippery surface.
In the diagram above, the driver hits the brakes hard on a slippery surface(1), then steers (2), and successfully manages to avoid the obstacle. ABSprevents the wheels from locking, and this allows you steer.
-
8/3/2019 Sensor Presentation Akhil Short
11/16
11
Visualising ABS inside the vehicle
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
.
-
8/3/2019 Sensor Presentation Akhil Short
12/16
12
Sensors For Active And Passive Security System
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
.Visualising ABS
-
8/3/2019 Sensor Presentation Akhil Short
13/16
13
Autonomous Cruise Control System (ACC)
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
.What is ACC ?
Autonomous cruise control is an optional cruise control system appearingon some more upscale vehicles / intelligent cars.
Cruise control (sometimes known as speed control or auto cruise) is asystem that automatically controls the speed of a motor vehicle.
These systems use either a radar or lasersetup allowing the vehicle to slow whenapproaching another vehicle andaccelerate again to the preset speed whentraffic allows.
Source: www.popsci.com
-
8/3/2019 Sensor Presentation Akhil Short
14/16
14
Types Of ACC
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
.
ACC
Radar Type Laser Type
Laser-based systems aresignificantly lower in costthan radar based systems
However, laser based ACCsystems do not detect and track
vehicles well in adverseweather conditions nor do theytrack extremely dirty (non-reflective) vehicles very well.
-
8/3/2019 Sensor Presentation Akhil Short
15/16
15
Example
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
.
Source: www.carsp.ca
-
8/3/2019 Sensor Presentation Akhil Short
16/16
16
User friendly
Seminar Automotive Sensors
Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun
.
Source: Google Image