Vehicle Brake Torque Control for Service Brake Overheating
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Solution Overview
Problem
Heavy vehicles experience overheating of service brake systems when traveling downhill, leading to insufficient brake torque and excessive wear, as drivers often rely heavily on friction brakes instead of auxiliary brakes for comfort reasons.
Innovation Solution
A method and control arrangement that dynamically adjust brake torque distribution between service and auxiliary brake systems, reducing service brake torque and increasing auxiliary brake torque when the service brake system temperature is at risk of overheating, ensuring the total brake torque meets the driver's request while preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If drivers use service brake system heavily for downhill speed control, then vehicle speed control is achieved, but service brake overheating and excessive wear occur
Solution Approach 1:
The control arrangement acts as an intermediary between the driver's braking request and the actual brake application. It monitors service brake temperature and automatically intervenes by redistributing brake torque from the service brake system to the auxiliary brake system when overheating is detected, thereby protecting the service brakes while maintaining speed control
Solution Approach 2:
The system dynamically changes the operating parameters of the brake systems by adjusting the torque distribution between service and auxiliary brakes based on temperature conditions. When service brake temperature exceeds thresholds, the control arrangement modifies the torque allocation parameter, reducing service brake torque and increasing auxiliary brake torque to maintain effective braking without overheating
2Force
If drivers use service brake system for downhill braking, then deceleration is achieved, but brake torque becomes insufficient due to overheating
Solution Approach 1:
The control arrangement performs preliminary monitoring of service brake temperature and proactively redistributes brake torque to the auxiliary brake system before the service brakes become overheated and ineffective. This preventive action ensures that sufficient brake torque is always available by preparing the auxiliary brakes in advance
Solution Approach 2:
The control arrangement serves as an intermediary that automatically manages the transition from service brake to auxiliary brake when temperature conditions indicate potential torque loss, ensuring continuous reliable brake torque availability without driver intervention
3Loss of substance
If auxiliary brake system is used instead of service brake, then service brake wear is reduced, but driver comfort may be compromised
Solution Approach 1:
The control arrangement acts as an transparent intermediary that automatically manages brake system selection and torque distribution. The driver experiences no difference in operation or comfort since the system maintains the same overall braking effect while internally redistributing torque to protect service brakes from wear
Solution Approach 2:
The brake control system serves itself by automatically monitoring its own temperature conditions and autonomously redistributing torque between brake systems. This self-managing capability eliminates the need for driver awareness or manual intervention, maintaining comfort while reducing wear
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
This approach maintains vehicle deceleration and speed control while reducing the risk of service brake overheating and wear, ensuring safety and comfort by effectively utilizing auxiliary brakes to alleviate the load on service brakes during downhill driving.
Implementation Method 1
a service brake system comprising friction brakes for applying a brake torque to at least non-driven wheels of the vehicle
Implementation Method 2
at least one auxiliary brake system for applying a brake torque to at least driven wheels of the vehicle
Data Source
AI summary
The present invention relates to a method performed by a control arrangement for controlling braking of a vehicle comprising: a service brake system and at least one auxiliary brake system for applying a brake torque to at least driven wheels of the vehicle, driver maneuverable means for requesting brake torque from the service brake system, the method comprising, when a brake torque is requested by the driver, and when a temperature of a friction brake of the service brake system increases, or is expected to increase: reducing brake torque applied by the service brake system, and increasing brake torque applied by the at least one auxiliary brake system such that the total resulting brake torque corresponds to the driver requested brake torque. The invention also relates to a control arrangement, a computer program, a computer-readable medium and a vehicle comprising a control arrangement.