Crimson Racing Wiki

Kill Switch Case

Subteam: ElectricalSubsystem: Custom ElectronicsAssembly: Kill Switch AssemblyCars: CR21, CR22, CR25, CR26I, CR26E

Purpose

Houses and protects the master switch.

Function

Signal is conditioned either on the sensor, on the Bosch DDU11 or on an Analog-to-CAN device, then logged centrally in the MoTeC M150 ECU. Frequency-critical parameters are sent over CAN at 1000 Hz.

Design Process

No part-specific design process is documented. The Custom Electronics subsystem design process applies: 1. Collect the sensor list from every subteam, agree location and type with the designer who needs the data. 2. Split sensors between ECU and dash based on which parameters are engine-critical. 3. Size the charging system and validate it. A custom current measurement board (50 A bidirectional sensing chip, inline on the rectifier-to-PDM wire) measured what the rectifier actually puts back. 4. Build the datalogging parameter list with rates, then check CAN bus load. 5. Validate on a mock endurance: average battery voltage 13.4 V, minimum 12.1 V excluding cranking on CR26I.

Manufacturing Process

Purchased.

Full Material List

Machined or 3D printed housing.

Reoccuring issues

None recorded. This part has no entry in Knowledge_Transfer/Issue Logging/Fault Vault.xlsx, in either Issue Log.xlsx, in CR22/Issue Tracking/Shakedown 7-15-23.xlsx, or in any design review issue list found in CrimsonStorage or Box.

Still to document

Nothing in CrimsonStorage covers these yet.