automotive sensors & actuators - indian institute of ... slide 1 author kapil dongare created...
TRANSCRIPT
![Page 1: Automotive Sensors & Actuators - Indian Institute of ... Slide 1 Author Kapil Dongare Created Date 9/14/2016 11:18:47 AM](https://reader034.vdocuments.us/reader034/viewer/2022051723/5aae1b9a7f8b9a6b308b9e02/html5/thumbnails/1.jpg)
Slide 1 © Copyright, Confidential, Tata Motors Ltd
Automotive Sensors & Actuators
30th August 2016
10:30 am
By,
Kapil Subhash Dongare
Electrical Department
Alumni 2012 Batch
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Slide 2 © Copyright, Confidential, Tata Motors Ltd
Evolution in Automotive Industry
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Slide 3 © Copyright, Confidential, Tata Motors Ltd
What is the first step you do while
starting the car??
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Slide 4 © Copyright, Confidential, Tata Motors Ltd
Remote Keyless Entry
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Slide 5 © Copyright, Confidential, Tata Motors Ltd
Electrical Actuators-Central Locking Actuators
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Slide 6 © Copyright, Confidential, Tata Motors Ltd
Now, Doors are unlocked.
What next??
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Slide 7 © Copyright, Confidential, Tata Motors Ltd
Hand Brake Position sensor:
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Slide 8 © Copyright, Confidential, Tata Motors Ltd
What next??
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Slide 9 © Copyright, Confidential, Tata Motors Ltd
Electric Actuator Application in Starting System
Pinion
Gear
Ring Gear
Solenoid
Assembly Criteria for starting the engine:
To run the engine at 250 rpm for definite
time.
Solenoid-Electrical Linear Actuator:
1. Ignition switch
2. EMS ECU
3. Crank relay
4. Solenoid
Pinion gear engagement
Supply to starter motor
5. Challenges
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Slide 10 © Copyright, Confidential, Tata Motors Ltd
Typical Engine Compartment:
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Slide 11 © Copyright, Confidential, Tata Motors Ltd
Electric Actuator Application in Injection System
Merits:
1. Highest precision-control positioning
2. Electric actuators can be reprogrammed quickly.
3. They offer immediate feedback for diagnostics and maintenance.
4. In terms of noise, they are quieter than pneumatic and hydraulic actuators 5. Because there are no fluids
leaks, environmental hazards are eliminated.
Demerits:
1. Cost 2. Performance depends on
environmental condition
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Slide 12 © Copyright, Confidential, Tata Motors Ltd
Now, Engine has started
What next??
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Slide 13 © Copyright, Confidential, Tata Motors Ltd
Hall Effect GSL Position Sensor Application
GSL Unit
Sensor Output Waveform
Logic Table
Nano AMT case
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Slide 14 © Copyright, Confidential, Tata Motors Ltd Output Voltage Waveform
Hall Effect Speed Sensor
Key Features:-
• It work at zero engine speed
• Many operate up to 15,000 rpm
• The air gap tolerances are very
large; up to 5 mm
• The sensor has 3 wires: power,
ground and signal.
• They are powered with low
voltage (4.75 to 24 volts) and
have very little current draw (20
mA).
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Slide 15 © Copyright, Confidential, Tata Motors Ltd
Hydraulic Actuator Application in Transmission System
This Part – Gear Selection
Getting automated in AMT
Master Cylinder
actuation done by
Hydraulic Clutch
actuator AMT system
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Slide 16 © Copyright, Confidential, Tata Motors Ltd
Clutch position detection
Gear position detection
Shift position detection
Hydraulic pressure sensing
Clutch speed detection
Door switch status
Brake switch status
Crank request switch status
Levers position status
Clutch Actuator
Gear Actuators
Shift Actuator
DC motor for hydraulic pump control
Cranking Relay
Hydraulic Actuator Application in Transmission System
TCU
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Slide 17 © Copyright, Confidential, Tata Motors Ltd
Hydraulic Actuator Application in Transmission System
Gear Shift Lever With Sensor
AMT Kit Transaxle
Sensor
System Block Diagram
AMT Kit
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Slide 18 © Copyright, Confidential, Tata Motors Ltd
Hydraulic Actuator Application in Transmission System
Types of Hydraulic Actuator:
1. Single acting
2. Double acting
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Slide 19 © Copyright, Confidential, Tata Motors Ltd
Hydraulic Actuator Application in Transmission System
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Slide 20 © Copyright, Confidential, Tata Motors Ltd
Hydraulic Actuator Application in Transmission System
Control Strategy:-
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Slide 21 © Copyright, Confidential, Tata Motors Ltd
Merits:
• Hydraulic actuators are rugged and suited for high-force applications. • A hydraulic actuator can hold the force
Demerits:
• Hydraulics will leak fluid. Loss of fluid leads to less efficiency. • Hydraulic fluid leaks lead to cleanliness problems and potential damage to
surrounding components and areas. • Hydraulic actuators require many companion parts, including a fluid reservoir,
motors, pumps, release valves, and heat exchangers, along with noise-reduction equipment.
• Overall weight of the system is very high
Hydraulic Actuator Application in Transmission System
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Slide 22 © Copyright, Confidential, Tata Motors Ltd
Merits:
• Simple Construction. • Better accuracy • Can work in extreme temperature areas. • Pneumatic actuators are also lightweight, require
minimal maintenance, • Cost-effective method of linear motion. Demerits:
• Pressure losses and air’s compressibility make pneumatics less efficient than other linear-motion methods.
• A compressor must run continually operating pressure even if nothing is moving.
• Even though the air is easily available, it can be contaminated by oil or lubrication, leading to downtime and maintenance
Pneumatic Actuator
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Slide 23 © Copyright, Confidential, Tata Motors Ltd
Clutch position sensor
Gear position sensor
Shift position sensor
Hydraulic pressure sensor
Clutch speed sensor
Door switch sensor
Brake switch sensor
Crank request switch sensor
Levers position sensor
Clutch Actuator
Gear Actuators
Shift Actuator
DC motor for hydraulic pump control
Cranking Relay
Sensors used in Transmission Control System
TCU
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Slide 24 © Copyright, Confidential, Tata Motors Ltd
Magnetic Reluctance Clutch Speed Sensor
Creeping Issue:
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Slide 25 © Copyright, Confidential, Tata Motors Ltd
Magnetic Reluctance Clutch Speed Sensor
• The magnitude & frequency of the voltage
produced is directly proportional to how fast
the magnetic field changes, therefore, the
faster the engine spins the higher the peak
voltage.
Merits:
i) Low cost
ii)Easy to package
Demerits:
• As the voltage increases, the potential for noise or interference (EMI) increases.
i) Use of twisted wires
ii) Use of filters
iii)Air gap increase
• Slow speed detection
• Difficult to diagnose
• Extra signal processing is required in TCU
• Pelican Issue
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Slide 26 © Copyright, Confidential, Tata Motors Ltd
LVDT Clutch Position Sensor
Hall Type-PWM output Clutch Position
Sensor
Circuit
Diagram
Output Waveform
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Slide 27 © Copyright, Confidential, Tata Motors Ltd
Hydraulic Pressure sensor
Potentiometric Capacitive Differential Transformer
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Slide 28 © Copyright, Confidential, Tata Motors Ltd
Hydraulic Pressure sensor
Pressure Sensor Characteristics
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Slide 29 © Copyright, Confidential, Tata Motors Ltd
Sensors used in Engine
Controller
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Optical Crankshaft Speed Sensor
Demerits:-
Sensitive to Contamination
Output Voltage Profile
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Slide 31 © Copyright, Confidential, Tata Motors Ltd
Airflow rate sensor
Purpose: Airflow rate is necessary for the engine control unit (ECU) to calculate
load on the engine and deliver the correct fuel mass to the engine
Control Circuit
Output Performance
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Slide 32 © Copyright, Confidential, Tata Motors Ltd
Throttle angle sensor
Key Features:
• This potentiometer can be used to measure any angular rotation.
• In particular, it is well suited for measuring throttle angle.
• The only disadvantage to the potentiometer for automotive applications is its analog
output.
• For digital engine control, the voltage v(a) must be converted to digital format
using an analog-to-digital converter
Control Circuit Accelerator Pedal
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Slide 33 © Copyright, Confidential, Tata Motors Ltd
Coolant sensor
Purpose: Engine coolant temperature information is used by engine control
unit (ECU) to decide fuel injection rate and idle speed control during cold
condition
Operating Principle:
1. Thermocouple
2. Thermistor (Negative temp coefficient of resistance)
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Slide 34 © Copyright, Confidential, Tata Motors Ltd
Lambda Sensor
Purpose: This sensor gives the value of current air to fuel ratio.
This sensor measures the oxygen content in exhaust gas
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Slide 35 © Copyright, Confidential, Tata Motors Ltd
Lambda Sensor
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Slide 36 © Copyright, Confidential, Tata Motors Ltd
Now, Vehicle is running at 80
Kmph
What next??
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Slide 37 © Copyright, Confidential, Tata Motors Ltd
ABS System: Sensors and Actuators
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Slide 38 © Copyright, Confidential, Tata Motors Ltd
ABS System: Sensors and Actuators
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Slide 39 © Copyright, Confidential, Tata Motors Ltd
Challenges in Automotive Industry
1.Cost- AMT Kit
2.Packaging issues
3.Time for new development
4.Opportunities for start-up
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Slide 40 © Copyright, Confidential, Tata Motors Ltd
Email: Contact No:
[email protected] 8237005268
[email protected] 9403571999