BAT Appt 6212 Technology Project (Automotive)

Week15
06th June 2014

Had a meeting with Simon for discussing the last step so that we can further move on and finish our work, we discuss for the 555 timer which he made us understand will not suite this project. so we head to next step by using

• Sensors
• Converters
• Logic
• Primary Outputs 
• Secondary Outputs

So we used multisim for making our further electric circuit, we also figure out the working of drive by wire,

Below is the electric diagram of Subarudrive by wire system

As our 555 timer idea was already out, so next step was to look for gates which can be used for the perfect combination so as to process the signals.

• NOT
• AND
• OR

BAT Appt 6212 Technology Project (Automotive)

Week14
30th May 2014

After the last class of the presentation we went to meet Simon for further discussion on the right way of connectivity for throttle cut off system as on our ends we put are best to search but some where was missing with the right information for the connectivity steps. But unfortunately  from long time we are trying to take out right circuit for our project which is the main reason of putting our self down, as once we make a right circuit than we can easily design that on multisim and which will help us to simulate the combined system using our inputs and outputs.

Somewhere after long discussion between me and my group mate we decided to go for 555 timer chip which  already has a logic circuit connectivity inside it so on the other hand we dropped the idea of using the picaxe chip for which we have to do programming, for which both of us dont have a single idea.
So considering the 555 timer

We try to call Simon to talk about it but unfortunately we couldn't meet him, we hope on Friday we can see him and talk about this to make the circuit as soon as possible and carry on with the final reports for our Project.

BAT Appt 6212 Technology Project (Automotive)

Week 13th
23rd May 2014
Starting with our presentation day we both got on time and was ready to present our demonstration on the stage 2 which I previously mentioned was planned to show the outputs and the connectivity.
Following were the 3 outputs mainly considered:

1. Seat Belt Warning Light
2. Buzzer System
3. Drive By Wire Throttle

Starting from the very 1st Seat belt warning light:

As everyone knows about as it is commonly used in every car to warn the driver to wear the seat belt, it is situated in the dashboard, the main description of warning light can be as follow:

•Seat belt warning lamp must blink for 6 seconds from IG. ON with 0.6 sec. frequency, 50% duty, and chime bell should ring too.

•If the IG. is turned OFF within 6 seconds, the warning lamp and chime bell output should be OFF.

•In case of the seat belt switch is ON, the chime bell sound must be stopped immediately, but seat belt warning lamp output should be ON during 6 seconds 

Warning light circuit diagram:

Second was the Buzzer system:

Alert avoid the accidents and for this REMINDER with Visual Indicator is provided to remind the driver.

Features

•If Seat Belt not fasten “After 15 second of ignition on status”. 3 times Audio massage & LED

•Still Seat Belt not fasten again & again Audio & LED flash after every 20 seconds (until seat belt fasten or mute).

DESCRIPTION:With the ignition switch turned ON and driver seat belt unfastened, the seat belt warning chime will sound for approximately 6 seconds.

• BCM (Body control module) receives seat belt buckle switch (driver seat) signal from combination meter with CAN communication line.

• BCM detects the ignition switch turned ON and the seat belt buckle switch (driver seat) is ON, and then transmits buzzer output signal (seat belt warning chime) to combination meter with CAN communication line.

• When the combination meter receives the buzzer output signal (seat belt warning chime), it sounds the buzzer.

Circuit diagram:

Third and the main output for out stage two was Drive by wire throttle:

Drive by wire which has no mechanical linkages, saves weight, is more accurate and has better response times however the cost to make this is greater than one a regular cable throttle.

Gas pedal à Sensor à ECUàMotoràButterfly ValveàThrottle Position SensoràECU

BAT Appt 6212 Technology Project (Automotive)

week 12th and 13th
16th May 2014

          

          As this was the presentation day for most of the people but me and Anuj was presenting next week our outputs were all ready to go but due to some circuit confusion for the throttle cut we had a meeting with MR.Anura and Mr.Prabhat.

            Both of them really helped us and came with the idea picaxe chip, but here was another thing to program the chip and make the ECU fool. so as to put throttle into the idle mode after 20km/h speed with drivers seat belt. the harder part was the programming the chip but we both decided to go for the presentation n c how far we go with it. 

BAT Appt 6212 Technology Project (Automotive)

Week 9th  - was uni vacation
25th April 2014
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week 10th - uni vacation
2nd may 2014
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Week 11th 
9th may 2014
We both planed to catch up on Monday after the mid semester break and shared the search we both did on our ends during the break time as we already knew our target to hit on next presentation which was mainly taking about our outputs which were:

1) Buzzer 

2) warning light 

3) Throttle cut off over 20 kph when seat belt is not buckled by the driver.

As to perform this we decided to USE  the drive by wire throttle system.

Same day we also took appointment with Mr.Anura so as to discuss with him and make our project into the next step.

BAT Appt 6212 Technology Project (Automotive)

week 8
18th April 2014
It was the middle of the semester time,  the break begins from 18th but on the other side was not a rest day for us we have to make sure we have sufficient data and for that we begin our search on some logic gates and circuits so as to try to make it and think which way we can make it. On the other side we loaned the book called "Performance Electronics for Cars" from Simon so as to go through some circuit diagrams and as we were plan to follow the gant chart as the next demonstration was after stage 2 where we planned to talk about the outputs.

BAT Appt 6212 Technology Project (Automotive)

week 7
11th March 2014

Was the day of our presentation, we started describing the 3 sensors for the input we are going to use. searching on them made me learn many things like the way they performs there functions and how they work as starting from the very first sensor which is

VSS (Vehicle Speed Sensor): As we know seat belt is one of the most safest part when it comes to be safety in vehicle, and all the vehicles in automotive industry use it.By the safety belt designers in recent years a Reed Switch sensor has been discovered as being the most reliable and best way to detect the engagement of seat belt.
Features/Functions:

•Can activate & control the switching function from the one side of the seat belt buckle.

•Is designed to handle the high shock environments

•Can be operated in dirty environments

•Is hermetically sealed

•Lots of reliable switching operation

•Reliable switching

•Dynamically tested contacts

> Second sensors which i searched n presented was the SOS

SOS(Seat Occupany Sensor): The occupancy sensor consist of the flexible sensor mat, which in inserted or installed into the vehicle seats.The mat consists of two sandwiched carriers sheets held together.

•Increase pressure on the mat will cause the electrical resistance change, which informs the system that the seat is occupied or not.

•The vacant or occupied seat will correspond to an open or short circuit.

•The occupancy on the seat is only detected for higher weight depending on the specs mostly 40 kg.

•The occupant detection technology will not affected by the

• Weight,  seat belt tension, or movement of the passenger.

•Furthermore, the system will not be triggered by inanimate objects placed on the seat.

FEATURES OF SOS:

·Senses immediate presence of pressure applied to pad.

·Bend Sensor / Potentiometer.

·Small size is ideal for embedded applications.

·User defined thresholds for alerts and notifications

>And 3rd sensor was the VSS(vehicle speed sensor which was performed by my group mate)