Vehicle Freewheeling Control for Brake Temperature Limits
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Solution Overview
Problem
During freewheeling mode, engine braking is absent, leading to increased brake temperature due to conversion of electric energy into heat, and limited deceleration gear stages, affecting brake performance and operability.
Innovation Solution
A control apparatus that includes a temperature sensor to monitor brake temperature, deactivating freewheeling mode when the temperature exceeds a threshold, and adjusts deceleration gear stages based on brake temperature and vehicle conditions to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If freewheeling mode is activated to improve fuel efficiency, then energy efficiency is improved, but brake temperature increases due to conversion of electric energy into heat energy in friction braking
Solution Approach 1:
The control apparatus continuously monitors brake temperature through a temperature sensor and uses this feedback to dynamically adjust the freewheeling mode operation. When brake temperature exceeds a predetermined threshold, the control apparatus restricts or terminates freewheeling mode, creating a closed-loop control system that balances fuel efficiency improvements with brake temperature management
Solution Approach 2:
The system dynamically adjusts the freewheeling mode operation based on real-time brake temperature conditions. The control apparatus modifies the degree of freewheeling activation or deactivation according to temperature feedback, transforming a static operation mode into a dynamic, condition-responsive system that optimizes energy efficiency while preventing brake overheating
2Use of energy by moving object
If freewheeling mode is activated to improve fuel efficiency, then energy efficiency is improved, but deceleration gear stage options are limited
Solution Approach 1:
The control apparatus dynamically adjusts the available deceleration gear stage options based on brake temperature feedback. When temperatures are within acceptable ranges, more gear stages remain available for driver selection. When temperatures approach thresholds, the system dynamically restricts available options, creating a flexible, condition-dependent operational framework
Solution Approach 2:
The system uses temperature sensor feedback to continuously monitor brake conditions and adjusts the available deceleration gear stage selections accordingly. This feedback mechanism ensures that driver options are adaptively managed to prevent brake overheating while maintaining fuel efficiency benefits
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
Enhances brake performance by preventing overheating and maintaining uniform deceleration options, improving driver awareness and safety, thus increasing energy efficiency.
Implementation Method 1
a generator (for example, a motor 13 described below) configured to be rotated by the power from the power source to generate electric power
Implementation Method 2
a friction brake (for example, friction brake equipment 15 described below) configured to generate frictional braking force on the vehicle
Data Source
AI summary
Provided is a control apparatus for vehicle that improves operability for a driver. A control apparatus for vehicle switches the vehicle to a freewheeling mode in which power generated by an engine is not transmitted to drive shafts. The control apparatus for vehicle includes: a motor; a battery; friction brake equipment that generates frictional braking force on the vehicle; a temperature sensor that acquires temperature of the friction brake equipment; and a determiner that assesses the temperature of the friction brake equipment acquired by the temperature sensor. The friction brake equipment generates the friction braking force when the battery is fully charged. The freewheeling mode is deactivated in a case where the temperature of the friction brake equipment exceeds a predetermined temperature while the battery is fully charged and the vehicle is in the freewheeling mode.