EV Launch Control With Pre-Torque for Faster Standstill Acceleration
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Solution Overview
Problem
Existing electric vehicles lack effective launch control systems to maximize acceleration performance, particularly in high-performance applications such as drag racing, where reducing the time to reach maximum acceleration from a standstill is crucial.
Innovation Solution
A launch control system and method for electric vehicles that includes an AVN system for selecting road grip level and launch control activation, an accelerator and brake pedal detector, and a vehicle controller to execute staged launch controls, applying pre-motor torque and boost modes to optimize acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If maximum torque is output from the start of launch, then instantaneous acceleration is achieved, but the initial launch response time cannot be further reduced
Solution Approach 1:
The system applies pre-motor torque to the motor before the vehicle actually launches (while the brake pedal is still pressed). This preliminary torque application prepares the motor in advance, so when the brake is released, the vehicle can immediately accelerate without waiting for torque build-up, thereby reducing launch response time while maintaining maximum acceleration capability.
Solution Approach 2:
The launch control is divided into multiple stages: a first-stage launch control that applies pre-motor torque when brake pedal depression is detected, and a second-stage boost control that activates when the brake is released. This segmentation allows the system to optimize torque application timing, reducing initial response time while maintaining maximum acceleration performance.
2Loss of time
If pre-motor torque is applied in advance, then launch response time is reduced, but system complexity increases
Solution Approach 1:
The vehicle controller automatically detects brake pedal depression and accelerator pedal input signals, and autonomously executes the pre-motor torque application and staged launch control sequences. The system serves itself by using existing sensor data (brake pedal detector, accelerator pedal detector) to trigger the control logic, eliminating the need for additional complex detection hardware or manual intervention.
Solution Approach 2:
The vehicle controller performs multiple functions: it detects brake and accelerator pedal inputs, determines torque command values based on motor available torque and battery state, executes first-stage pre-motor torque application, and transitions to second-stage boost control. By making the controller multi-functional, the patent avoids adding separate dedicated devices for each function, thereby limiting the increase in system complexity.
3Productivity
If staged launch control is implemented, then acceleration performance is optimized, but control complexity increases
Solution Approach 1:
The system continuously monitors brake pedal depression amount and accelerator pedal input signals, and uses this feedback to determine when to transition between control stages. The vehicle controller adjusts torque command values based on real-time sensor data, creating a closed-loop control system that optimizes acceleration performance while managing control logic complexity through systematic decision-making based on measurable parameters.
Data Source
AI summary
A launch control system and method for an electric vehicle, which are capable of satisfying a driver's demand for a high-performance vehicle by realizing the high performance of the electric vehicle. The system and method maximize acceleration at an initial stage of launching the electric vehicle from a standstill, thereby shortening the time to reach the maximum acceleration when launching the electric vehicle from the standstill.