automotive sensors - copy

8/4/2019 Automotive Sensors - Copy

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SUBMITTED BY,

ARAVIND P

S7 AU

SAU-2644



Oilsensor

Oxygen

sensor

Fuel level

Accelerometer

Seat belt tension

Passenger Occupancy

Wheel speed

Tire pressure monitor

Anti thief sensors

Radar sensor

Rain sensor

Parking sensor

Indoor/outdoortemperature sensors

GPS

Water coolanttemperature

TachometerSpeedometer Odometer



Engine Sensors Oxygen sensor

Oil sensors

Mass Air Flow

Knock



O2 sensorsMiniature voltage generator

Compare the exhaust O2 level and outside air O2 level



O2 sensors High voltage: fuel mixture rich, little unburned oxigen

Low voltage: fuel mixture lean, excess oxygen



Oil sensors

They are basically of two types:

1. Oil level sensors

2. Oil conditionsensors

Oil quality sensors

Oil debris sensors



MASS AIR FLOW SENSORS

Measures the volume & density of air entering the engine. The computer uses this information to calculate the apt

amount of fuel to deliver ,in conjunction with other sensorslike oxygen sensor.



Vane meter sensor Hot wire sensor

Measures the air flow intothe engine with a springloaded flap attached to apotentiometer.

Determines the mass of air flowing into theengine by heating a wire,

with an electric current,suspended in the airstream.



KNOCK SENSORS

Used to detect engine detonation.

Located on the top center of the engine block.

Accelerometer with sensor resonate at approximately the same frequency as the engine knock frequency.



POSITION SENSORS Detects the presence of nearby objects without any

physical contact.

It emits an electrostatic field & looks for changes in thefield.



PARKING SENSORS They alert the driver to unseen obstacles during

parking maneuvers

They use ultrasonic proximity detectors embedded inthe bumpers, to measure the distances to nearby objects.



Electromagnetic parking sensor Rely on the vehicle moving

slowly & smoothly towardsthe object to be avoided.

If the vehicle momentarily stops on its approach thesensor cannot detect theobject.

Holes are not required tobe drilled into the bumperduring fitting.



Ultrasonic parking sensors

Much more reliable

than electromagneticsensors

They continue to

indicate the objectdistance even when the vehicle is stationary.



Intelligent parking system Uses computer processors, backup camera,

forward sensors attached to front side fenders.

The sensor calculates steering angle data andsteers the vehicle automatically

Once the brake is pressed or the steering wheel istouched ,the automatic parking disengages.



Temperature sensors Different types:

• Engine coolant temperature

•

Intake air temperature• Exhaust recirculation gases

They all have the same working principle.

The ECM detects the temperature from the voltageof the signal generated.



Rain sensor• Based on total internal reflection.

• Optical sensors are used to detect the moisture .

• The sensor projects infrared light into the windshield.

•

Photodiode → Amplifier→ CPU→ wipers on, windows up

automotive sensors - copy

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