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Goals and Feature
Goals and Feature
To maximize the performance of our powertrain we need software that can maximize grip in all conditions. Common software that can be found in road car and race car are traction control, and torque vectoring. Since we did not build a real car we will go over the basic principal of each software and how we can utilize them in our car.
Integration
Integration
Battery temperature management system
Battery temperature management system
Acceleration cut off by temperature
If the battery temperature reaches 58C, the system will reduce the discharging rate in order to control the temperature under 60C. However, if the temperature still reaches 58C when the C rate is 3C, System will shut down high volt system.
Regenerative braking cut off by temperature
If the regenerative braking rate is less than or equal to 4C and the battery temperature exceeds 58C, the system will decrease the braking rate. However, if the regenerative braking rate is 2C and the battery temperature is still above 58C, the system will cut off the regenerative braking system.
Adjustable traction control
Adjustable traction control
A normal traction control system will use a difference of wheel speed from each wheel to determine which wheel is slipping and cut torque on that wheel. Our system will use a different logic. The system will remember a set max acceleration, when a wheel accelerate too fast the system will know that that wheel is slipping and cut power to that wheel. The max acceleration can be tested on the race day to get the most accurate data. The driver will also have the choice to increase or decrease the max acceleration data from onboard the vehicle in case of changing conditions.
Torque Vectoring
Torque Vectoring
Since our car use the dual motor setup without a traditional differential, we need torque splitting capabilities from our controller to apply the torque at each wheel accordingly. Steering position angle and the vehicle's speed can be calculate into an optimal torque split at the rear wheel. The dataset will be predetermine by testing and during the race the controller can split the torque according to the onboard memory and input from wheel speed sensor and steering angle sensor. The system can split the torque up to 100 percent to one wheel.
Adjustable Regenerative Braking
Adjustable Regenerative Braking
The Regenerative Braking will be adjustable via two button shifter on the steering wheel to set how aggressive the Regenerative Braking will be. The level will vary from No Regenerative Braking at all to Applying Regenerative Braking at 20% of Maximum Regen Torque (Maximum 50 Nm per Motor) when lifting the throttle completely.
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