Brake Thermal Sensing for Residual Drag Torque Detection
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Solution Overview
Problem
Residual braking torque in vehicles, caused by unintended interactions between brake pads and discs, leads to increased fuel consumption and brake pad wear, posing challenges for meeting stringent CO2 emission limits.
Innovation Solution
A method and device using an N-dimensional calculation model with temperature sensors and an electronic control unit to estimate residual braking torque by calculating a reference temperature and comparing it to the acquired temperature, incorporating variables like vehicle speed and ambient temperature, to detect and limit this torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors and N-dimensional calculation models are used to estimate residual braking torque, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses a multi-functional approach where temperature sensors serve dual purposes: monitoring brake temperature for thermal management and providing data for residual torque estimation. The N-dimensional calculation model integrates multiple input variables (temperature, vehicle speed, ambient temperature, time delay) to perform both thermal behavior prediction and torque estimation, reducing the need for separate dedicated components.
Solution Approach 2:
The patent replaces direct mechanical measurement of residual torque with a thermal-based indirect measurement system. Instead of using mechanical sensors to detect torque, the system uses temperature sensors and computational models to estimate torque based on thermal behavior, thereby avoiding complex mechanical measurement mechanisms.
2Reliability
If real-time temperature monitoring and N-dimensional calculation models are implemented, then residual braking torque detection capability is improved, but use of energy increases
Solution Approach 1:
The system performs preliminary thermal behavior prediction using the N-dimensional calculation model to establish reference temperatures before actual braking events. By pre-calculating expected thermal patterns based on stored vehicle operating data, the system reduces the computational burden during real-time operation and minimizes continuous high-power processing requirements.
Solution Approach 2:
The system utilizes existing vehicle operating data (speed, ambient temperature, braking patterns) that are already being collected for other vehicle control functions. This self-service approach allows the residual torque estimation to leverage already-acquired data without requiring additional dedicated sensors or data collection infrastructure, thereby reducing incremental energy consumption.
3Measurement precision
If multiple input variables are used in the N-dimensional calculation model, then estimation accuracy is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The system merges multiple data sources into a unified estimation framework. Temperature sensor data is combined with vehicle speed data, ambient temperature readings, and time delay information from the vehicle's existing control systems. The N-dimensional calculation model integrates these diverse inputs into a single coherent estimation process, reducing the complexity of managing separate measurement systems.
Solution Approach 2:
The patent introduces a computational intermediary layer (the N-dimensional calculation model) that processes and harmonizes data from multiple sources. This intermediary model acts as a mediator between raw sensor inputs and the final torque estimation, standardizing data formats and handling the complexity of multi-variable integration, thereby simplifying the overall measurement architecture.
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
Enables real-time estimation and reduction of residual braking torque, improving fuel efficiency and brake pad wear, while being compatible with on-board systems and compatible with remote monitoring.
Implementation Method 1
acquiring the temperature value of said braking element
Implementation Method 2
automatically calculating a reference temperature by providing an N-dimensional vector of variables as input to an N-dimensional calculation model. The N-dimensional calculation model can be an analytical or experimental characterization of the thermal behavior of the brake
Implementation Method 3
The braking element can include a braking disc or drum and said braking element can includes a wearable block of friction material and a back support plate for the friction material block
Data Source
AI summary
Methods and devices for estimating a residual torque between the braked (e.g., brake disk or drum) and braking elements (e.g., support plate or friction block) of a vehicle based on acquired and reference temperatures, where the reference temperature can be calculated using an N-dimensional calculation model with an N-dimensional vector of input variables, and where said N-dimensional calculation model can be an analytical or experimental characterization of the thermal behavior of the brake.