Vehicle Launch Start Control Using Brake-Accelerator Coordination
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Solution Overview
Problem
Existing vehicle control systems require the brake and accelerator pedals to be operated separately, limiting simultaneous braking and acceleration, and necessitate a creeping mode before increasing vehicle speed, which slows down the starting process.
Innovation Solution
A vehicle control method that allows simultaneous operation of the brake and accelerator pedals to activate a launch starting function, determining the pressure and opening degree of these pedals to control engine torque and brake state, ensuring safe and rapid vehicle startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the brake pedal and accelerator pedal are operated separately, then the driving intention can be clearly identified, but the vehicle starting speed is slow and the acceleration time is long
Solution Approach 1:
The system dynamically switches between different control modes (normal mode and launch start mode) based on real-time detection of pedal operation patterns. When simultaneous braking and acceleration is detected, the system transitions to launch start mode which allows engine torque to act on the wheels directly, providing rapid acceleration. This dynamic adaptation resolves the contradiction by enabling high-speed starting when needed while maintaining clear pedal operation interpretation in normal conditions.
Solution Approach 2:
The system changes the engine torque output parameter based on the detected pedal operation state. In normal operation, torque is controlled according to accelerator pedal position alone. When simultaneous brake and accelerator operation is detected, the system modifies torque parameters to enable launch starting, allowing the engine to provide maximum torque directly to the wheels for rapid acceleration, thus improving starting speed without compromising operational clarity.
2Power
If the engine torque is prohibited when the brake pedal is stepped on, then the braking safety is ensured, but the vehicle cannot start quickly with greater power
Solution Approach 1:
The system segments the braking operation into different phases: normal braking where torque is prohibited, and launch start braking where torque is permitted. By detecting the specific pattern of simultaneous brake and accelerator operation, the system identifies launch start intent and applies torque during this segmented phase. This segmentation allows the system to maintain braking safety in normal operations while enabling high-power starting when the specific launch start condition is met.
Solution Approach 2:
The control system acts as an intermediary that mediates between the brake pedal signal and the engine torque output. Instead of a direct prohibition relationship, the intermediary controller analyzes the combined state of both pedals and determines whether to permit torque based on the detected operation pattern. This intermediary function enables the system to permit torque during launch start operations while maintaining safety during normal braking, thus resolving the contradiction between power output and braking safety.
3Productivity
If the vehicle enters the creeping mode before increasing speed, then the engine torque can be slowly increased, but the acceleration time is extended
Solution Approach 1:
The system implements periodic action by rapidly cycling through torque increase phases and stabilization phases during launch start. Instead of a single slow creeping phase, the system uses controlled periodic torque adjustments that allow the vehicle to quickly accelerate while maintaining stability. This periodic torque application significantly improves acceleration efficiency compared to the traditional single-phase creeping mode, enabling faster startup without compromising control.
Data Source
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AI summary
The present disclosure relates to the technical field of vehicles, and particularly to a vehicle control method and apparatus, a storage medium and a vehicle. The method includes: acquiring a pressure of a brake master cylinder and an opening degree of an accelerator pedal; when the pressure of the brake master cylinder is greater than a first preset pressure threshold, the opening degree of the accelerator pedal is no less than a first preset opening degree threshold, and a moment when the pressure of the brake master cylinder is greater than the first preset pressure threshold is earlier than a moment when the opening degree of the accelerator pedal is no less than the first preset opening degree threshold, controlling the vehicle to enter an activated state of a launch starting function; and when the vehicle is in the activated state, controlling an engine of the vehicle to output a target torque. Thus, a driver enables the vehicle to enter the activated state of the launch starting function before starting by operating a brake pedal and the accelerator pedal at the same time, and also enables the vehicle to provide a torque output according to a state of the accelerator pedal while being in a brake state, thus enabling the vehicle to start quickly with greater power, reducing an acceleration time and realizing launch starting.