Week 13

This week, we continued making our electrical circuit to show for our project. We figured out how the drive by wire system works. Shown in the below diagram is a wiring diagram for a Subaru Drive By Wire throttle system.

Next we decided on our processing and decided to not use a 555 timer chip changing our mind because we weren't actually going to build a prototype and instead going to make an electrical circuit to prove how our system worked as lacking time. We decided to use logic gates to process our signals.
The following image shows the logic table.

This table indicates that if the SOS (Seat Occupancy Sensor) detects pressure on the seat, and the vehicle speed is over 20 kph and the seat belt sensor doesn't detect a seat belt buckle clipped in, the throttle output will turn their respective signals high and low.

We found that the waveform with the throttle cut looks like such.

The red line is the high signal and the blue line is the low signal. As you can see in the image, the idle is at 0.7V low (blue) and 4.3V high (red). At just before 0.6s, the throttle is opened and the signal begins to invert as shown in the previous TPS waveform however, in this waveform, you can see the signal being cut as soon as the vehicle speed sensor senses that the speed is over 19kph and the SOS (Seat Occupancy Sensor) and the SBS (Seat Belt Sensor) are both also on.

We're expecting to be completed by mid week next week.