Embedded Files
EV.4 COMPONENTS
EV.4.1 Motors
EV.4.1.1 Only electrical motors are allowed. The number of motors is not limited.
EV.4.1.2 Motors must meet T.5.3
EV.4.1.3 If used, Outboard Wheel Motors, where the motor, attendant cables and wiring do not meet F.11.1.3, must:
a. Include an Interlock EV.7.8
This Interlock(s) must Open the Shutdown Circuit EV.7.2.2 before failure of the Tractive System wiring when the wiring is damaged or the Wheel/Motor assembly is damaged or knocked off the vehicle.
b. Reduce the length of the portions of wiring and other connections that do not meet F.11.1.3 to the extent possible
EV.4.2 Motor Controller
The Tractive System Motor(s) must be connected to the Accumulator through a Motor Controller. No direct connections between Motor(s) and Accumulator.
EV.4.3 Accumulator Container
EV.4.3.1 Accumulator Containers must meet F.10
EV.4.3.2 The Accumulator Container(s) must be removable from the vehicle while still remaining rules compliant
EV.4.3.3 The Accumulator Container(s) must be completely closed at all times (when mounted to the vehicle and when removed from the vehicle) without the need to install extra protective covers
EV.4.3.4 The Accumulator Container(s) may contain Holes or Openings
a. Only the wiring harness, ventilation, cooling and fasteners may pass through holes in the Accumulator Container(s)
b. Holes and Openings in the Accumulator Container must meet F.10.4
c. External holes must meet EV.6.1
EV.4.3.5 Any Accumulators that may vent an explosive gas must have a ventilation system or pressure relief valve to release the vented gas
EV.4.3.6 Completely sealed Accumulator Containers must have a pressure relief valve
EV.4.3.7 Pressure relief valves must not have line of sight to the driver, with the Firewall installed or removed
EV.4.3.8 Each Accumulator Container must be labelled with the:
a. School Name and Vehicle Number
b. Symbol specified in ISO 7010-W012 (triangle with black lightning bolt on yellow background) with triangle side length of 100 mm minimum
c. Text “Always Energized”
d. Text “High Voltage” if the voltage meets T.9.1.1
EV.4.4 Grounded Low Voltage System
EV.4.4.1 The GLV System must be:
a. A Low Voltage system that is Grounded to the Chassis
b. Able to operate with Accumulator removed from the vehicle
EV.4.4.2 The GLV System must include a Master Switch, see EV.7.9.1
EV.4.4.3 A GLV Measuring Point (GLVMP) must be installed which is:
a. Connected to GLV System Ground
b. Next to the TSMP EV.5.8
c. 4 mm shrouded banana jack
d. Color: Black
e. Marked “GND”
EV.4.4.4 Low Voltage Batteries must meet T.9.2
EV.4.5 Accelerator Pedal Position Sensor - APPS
Refer to T.4.2 for specific requirements of the APPS
EV.4.6 Brake System Encoder - BSE
Refer to T.4.3 for specific requirements of the BSE
EV.4.7 APPS / Brake Pedal Plausibility Check
EV.4.7.1 Must monitor for the two conditions:
The mechanical brakes are engaged EV.4.6, T.3.2.4
The APPS signals more than 25% Pedal Travel EV.4.5
EV.4.7.2 If the two conditions in EV.4.7.1 occur at the same time:
a. Power to the Motor(s) must be immediately and completely shut down
b. The Motor shut down must stay active until the APPS signals less than 5% Pedal Travel, with or without brake operation
The team must be able to demonstrate these actions at Technical Inspection
EV.4.8 Tractive System Part Positioning
All parts belonging to the Tractive System must meet F.10.5.8
EV.4.9 Housings and Enclosures
EV.4.9.1 Every housing or enclosure containing parts of the Tractive System other than Motor housings, must be labelled with the:
a. Symbol specified in ISO 7010-W012 (triangle with black lightning bolt on yellow
background)
b. Text “High Voltage” if the voltage meets T.9.1.1
EV.4.9.2 If the material of the housing containing parts of the Tractive System is electrically conductive, it must have a low resistance connection to GLV System Ground, see EV.6.7
EV.4.10 Accumulator Hand Cart
EV.4.10.1 Teams must have a Hand Cart to transport their Accumulator Container(s)
EV.4.10.2 The Hand Cart must be used when the Accumulator Container(s) are transported on the competition site EV.11.4.2 EV.11.5.1
EV.4.10.3 The Hand Cart must:
a. Be able to carry the load of the Accumulator Container(s) without tipping over
b. Contain a minimum of two wheels
c. Have a brake that must be:
Released only using a dead man type switch (where the brake is always on except when released by pushing and holding a handle) or by manually lifting part of the cart off the ground
Able to stop the Hand Cart with a fully loaded Accumulator Container
EV.4.10.4 Accumulator Container(s) must be securely attached to the Hand Cart
This ruleset encompasses various regulations governing the key systems and components of our vehicle. Firstly, only electrical motors are permitted, with no limit on their number, as long as they meet specific technical requirements. Motors must comply with designated standards and, if used as Outboard Wheel Motors, must include safety interlocks and minimize non-compliant wiring lengths. The Motor Controller must intercede between the motors and the Accumulator, without any direct connections. Accumulator Containers must meet stringent safety standards, be removable while remaining compliant, and be fully sealed except for necessary openings for wiring and ventilation. Containers with potential for gas venting must include appropriate ventilation or pressure relief systems, with safety measures to prevent visibility of pressure relief valves to the driver. All containers must bear specific labeling indicating school name, vehicle number, and safety warnings. Additionally, the Grounded Low Voltage System must be integrated into the chassis and include a master switch, ensuring operational safety even with the Accumulator removed. Other components like the Accelerator Pedal Position Sensor (APPS) and Brake System Encoder (BSE) must meet defined technical specifications and undergo rigorous plausibility checks during technical inspections. Housings and enclosures must be clearly labeled and, if conductive, grounded to the Low Voltage System. Finally, all teams are required to have a designated hand cart for safely transporting Accumulator Containers during the competition.
For more specific information about each rule, click the buttons below to navigate to the Sub-Tabs within this section.
Page updated
Report abuse