The document discusses vehicle safety technologies. It describes the brake override system, which uses sensors and a computer to reduce engine power and engage the brakes if both the accelerator and brake are applied simultaneously. It also describes hill start assist, which uses sensors and electronic control to hold the vehicle briefly on an incline to prevent rolling backwards when the driver releases the brake. These systems improve safety by preventing accidental acceleration and making starting on hills easier.

1. SAFETY OF VEHICLES
PRESENTED BY:
(GROUP NO:M-P-4)
PRATIK WASNIK
TUSHAR ANEYRAO

2. Introduction
• Necessity of Safety of vehicles
– As number of vehicles are increasing hence number of
accidents and their causes are also increasing. To avoid
this many technologies have been developed recently.
• Latest trends and technologies
– Brake override system
– Hill start assist

3. BRAKE OVERRIDE SYSTEM
PRINCIPLE OF WORKING

4. Working and Components
• Sensors
– The sensors detect the simultaneous application
on brake and accelerator .
– They send the signals to the computer.
• Computer
– It operates the throttle valve and reduces the
power output , so action of braking is performed
than accelerating.

5. Hill Start Assist
• When we move our stationary vehicle
standing on a slope we get a backward rolling
effect due to gravity.
• This effect may cause accidents viz. hitting
vehicle standing behind us or even vehicle can
get out of control.
• These causes are minimized by Hill Start
Assist.

6. Components
• Angle sensors
• Pressure sensors
• Torque sensors
• Wheel speed sensors
• Electronic control unit (ECU)
• Brake actuator

7. Working
• Clutch detection
• Incline detection
• Engine torque detection
• Brake detection
• Backward motion detection

8. Vehicle moving slightly Vehicle moving straight with
backward without Hill Hill start assist
start assist

9. BENEFITS
• It makes driving easier in certain situations.
• Less wear and tear on other parts of the car, such
as the handbrake, that you might use to do the
same job manually.
• In a manual transmission-equipped car you don't
have to ride the clutch when starting out on a hill,
meaning there's less wear on the clutch.
• By preventing the car from rolling backwards, hill-
start control puts less strain on the engine and
drive train

10. REFERENCES
• http://auto.howstuffworks.com/car-driving-
safety/safety-regulatory-devices/hill-start-
control1.htm
• http://en.wikipedia.org/wiki/Hill_Start_Assist
• http://auto.howstuffworks.com/car-driving-
safety/safety-regulatory-devices/brake-
override-systems.htm