Brake Holding Control for Smooth Vehicle Take-off
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Solution Overview
Problem
Motor vehicles face difficulties when taking off from rest, especially when ascending a slope or towing a heavy trailer, as they often experience excessive wheel spin, unintentional roll-back, or engine stalling due to the additional weight.
Innovation Solution
A method involving a brake system with a brake holding mode and an engine driving mode, controlled by a human machine interface, which transitions the vehicle from a brake holding mode to an engine driving mode to achieve a target speed, balancing engine force with braking force to prevent wheel spin and ensure smooth take-off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver manually controls the vehicle take-off from rest on a slope or while towing, then the driver has direct control over the vehicle, but excessive wheel spin, unintentional roll-back, or engine stalling occurs
Solution Approach 1:
The system enables automatic take-off operation where the vehicle controls itself during the take-off phase. The control system automatically coordinates engine torque and brake force without requiring manual driver intervention, allowing the vehicle to self-regulate the transition from stationary to moving state while maintaining stability on slopes or when towing.
Solution Approach 2:
The patent replaces manual mechanical control by the driver with an automated electronic control system. The control system electronically coordinates the engine and brake systems, substituting the driver's manual operational control with an automated system that precisely manages the force balance between engine torque and brake holding force during take-off.
2Power
If the engine generates high driving force to overcome additional weight, then the vehicle can accelerate uphill or while towing, but excessive wheel spin occurs
Solution Approach 1:
The system applies preliminary braking force before engine torque is applied during take-off. The brake system generates holding force in advance to prevent wheel spin, and this braking force is gradually reduced as engine torque increases, ensuring the wheels remain stationary until sufficient driving force is achieved without causing wheel spin.
Solution Approach 2:
The control system dynamically changes the parameters of engine torque and brake force during the take-off process. The engine torque is gradually increased from zero to the required level, while the brake holding force is simultaneously decreased from maximum to zero, creating a smooth transition that prevents wheel spin while achieving the necessary driving force.
3Force
If the brake holding force is applied to prevent roll-back, then the vehicle remains stationary on a slope, but unintentional roll-back or stalling occurs during take-off
Solution Approach 1:
The system dynamically adjusts the brake holding force during the take-off process rather than maintaining a static braking force. The brake force is continuously modulated in coordination with engine torque application, transitioning from full holding force to zero as the vehicle accelerates, ensuring smooth take-off without roll-back or stalling.
Solution Approach 2:
The control system monitors vehicle motion and adjusts the brake holding force and engine torque accordingly. By detecting the vehicle's response to applied forces, the system provides feedback control that prevents unintentional roll-back and ensures smooth transition during take-off, coordinating the reduction of brake force with the increase in engine driving force.
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
The method effectively prevents wheel spin and ensures smooth take-off by adjusting engine torque and braking force, maintaining the target speed until driver intervention, thus improving traction and reducing tire wear.
Implementation Method 1
a brake of the brake system generates a brake holding force that prevents movement of a wheel of the motor vehicle
Implementation Method 2
the engine generates a driving force that rotates a wheel of the motor vehicle
Data Source
AI summary
A method for controlling a motor vehicle take-off from rest including the steps of transitioning the vehicle from a brake holding mode to an engine driving mode and then accelerating the vehicle in a forward direction until a set vehicle target speed has been reached. The method including maintaining the vehicle at the set target speed until a driver of the vehicle intervenes.