EV Launch Control With Torque Pre-Load and Thermal Cooling
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Solution Overview
Problem
High performance vehicles experience drivetrain losses and incomplete temperature monitoring, particularly in battery electric vehicles, leading to wheel slip, overheating, and reduced launch performance.
Innovation Solution
A launch control system with torque pre-loading and advanced thermal management, utilizing a controller to apply torque pre-load via an electric traction motor while braking wheels, and a thermal system to cool critical components, ensuring optimal temperature monitoring and efficient power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If torque pre-load is applied to prevent wheel slip and optimize launch performance, then vehicle acceleration performance is improved, but drivetrain losses increase at standstill
Solution Approach 1:
The system applies torque pre-load to the drive wheels before the vehicle launch to optimize acceleration performance. The controller activates the electric traction motor to deliver pre-load torque to the wheels while the vehicle is stationary, preparing the drivetrain for immediate power delivery upon launch, thus improving acceleration response and reducing wheel slip.
2Power
If high power is delivered to the wheels during launch control, then vehicle performance is optimized, but temperature rise in critical components increases leading to overheating
Solution Approach 1:
The thermal management system preemptively cools critical components including the electric traction motor, inverter, and windings before launch control activation. The coolant circulation system is activated in advance to reduce the temperature of these components, ensuring they are in an optimal thermal state to withstand the high power delivery during launch without overheating.
Solution Approach 2:
The thermal management system maintains continuous coolant circulation throughout the launch control process. The coolant loop continuously removes heat from critical components during the high-power delivery phase, ensuring sustained thermal management capability and preventing temperature rise that would lead to overheating and potential component damage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances launch performance by minimizing drivetrain losses, preventing overheating, and ensuring consistent acceleration by optimizing power delivery and thermal management.
Implementation Method 1
a thermal system configured to cool the electric traction motor
Implementation Method 2
a coolant loop configured to circulate a coolant to cool the electric traction motor, an inverter, and windings of the electric traction motor
Implementation Method 3
a brake system to brake one or more of the vehicle wheels
Implementation Method 4
an electric traction motor configured to selectively provide drive torque to wheels of the vehicle
Data Source
AI summary
A vehicle system for an electrified vehicle, which implements a launch control mode to launch the electrified vehicle with a torque pre-load, includes an electric traction motor configured to selectively provide drive torque to wheels of the vehicle, a thermal system configured to cool the electric traction motor, a brake system to brake one or more of the vehicle wheels, and a controller having one or more processors. The controller is programmed to determine whether one or more vehicle conditions are satisfied, and apply a torque pre-load to the vehicle wheels via the electric traction motor, based on the vehicle conditions being satisfied, while the vehicle is at a standstill by braking the vehicle wheels with the brake system.