Car Architecture

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Mechanical

Our vehicle is a single motor + differential car. Many other teams have more sophisticated drivetrains, including setups with hub motors, which allow you to eliminate all spinning shafts inboard of the wheels.
We have stuck with the traditional single motor + differential setup for simplicity.
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Electrical

For most up to date information, check the draw.io

Overview

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Shutdown Circuit

The shutdown circuit (Described in EV.7.2) is a safety mechanism which serves to disconnect the Tractive System either automatically or manually. This is done through a series of switches and interlocks which can break power supply to the IR'S thus isolating the Tractive System from the outside world to protect us from the high voltage. For specifics on the wiring, see the drawing below.

CAN (Controller Area Network)

CAN is a rugged information bus protocol that allows many devices to communicate with one another over a limited number of wires (two per bus). On NFR25 we have two separate CAN busses. This means that devices can only communicate with other devices on the same bus (unless they use another device which is on both busses as an intermediary). Our two CAN busses are called DATA and DRIVE CAN. DATA is (as the name suggests) intended for purely data acquisition purposes and is not drive critical. DRIVE contains information directly related to controlling the driving of the car and is drive critical. There are two buses to reduce the bus load of any one bus which is intended to make the car's communication network more robust.

For more low level information on how CAN actually works, refer to this article on DigiKey or this one, as well as this article on CAN errors

The drawing below denotes which devices are connected to which CAN busses, arranged as to approximate location within the car.

Battery Structure

Accumulator

🚧 overview text 🚧
The Accumulator is the high voltage battery which supplies the power that drives our motor. It is important to exercise caution when handling the Accumulator

Full Pack Electrical Structure
Cells Configuration Max Voltage Nominal Voltage Capacity Fused Current
Molicel p45b 5 Series Segments see table below 588 V 504 V 🚧 80 A
Fuse
Datasheet
Single Segment Electrical Structure
Cells Configuration Max Voltage Nominal Voltage Capacity Fused Current
Molicel p45b 28s3p 117.6 V 100.8 V 🚧 80 A

Low Voltage (LV) Battery

The LV Battery powers everything other than the Tractive System. It's located in the #LV Box. The mechanical structure is designed by the Accumulator Subteam and the electrical structure is designed by the Power Distribution Subteam.

Electrical Structure
Cells Configuration Max Voltage Nominal Voltage Capacity Fused Current
Molicel p42a 6s3p 25.2 V 21.6 V 12.6 Ah 40 A
Fuse

Power Distribution

All GLV power is supplied by the LV Battery

Enclosures

Dashbox

LV Box

Accumulator

Penthouse

Inverter

Backbox