Hybrid Vehicle Braking Control via Electric Machine Torque
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Solution Overview
Problem
Existing rear wheel unlock braking systems in vehicles suffer from insufficient deceleration capability, short service life, and poor stability, particularly when the ESP or hydraulic braking system fails, leading to inadequate braking performance.
Innovation Solution
A vehicle braking control method that activates the electronic parking brake system, checks for rear wheel unlock braking conditions, and uses motive power from an electric machine to assist the rear wheel unlock braking system, determining the vehicle stability characteristic through parameters like wheel speed and acceleration to decide on the use of electric machine power for enhanced braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If rear wheel unlock braking system is used alone, then system complexity is reduced, but deceleration capability is insufficient
Solution Approach 1:
The patent combines the rear wheel unlock braking system with the electric machine (motor) to form a hybrid braking system. The electric machine provides additional deceleration force through reverse torque, merging two power sources (friction braking and electric braking) to achieve superior deceleration capability while managing system complexity through integrated control.
2Ease of manufacture
If rear wheel unlock braking system is used alone, then system cost is reduced, but service life is short
Solution Approach 1:
The patent implements continuous monitoring of braking conditions, vehicle speed, and component status to optimize the distribution between friction braking and electric braking. This continuous adjustment extends service life by preventing excessive wear on any single component while maintaining cost-effectiveness through intelligent resource allocation.
Solution Approach 2:
The system dynamically changes operating parameters (braking force distribution, electric machine torque, braking activation conditions) based on real-time vehicle state to extend service life. By adjusting these parameters, the system reduces stress on individual components while maintaining overall braking performance.
3Device complexity
If rear wheel unlock braking system is used alone, then system simplicity is maintained, but braking stability is poor
Solution Approach 1:
The patent incorporates feedback mechanisms that continuously monitor braking effectiveness, vehicle deceleration rate, and road conditions. This feedback is used to adjust the braking force distribution between the rear wheel unlock system and electric machine, improving braking stability while maintaining relatively simple system architecture through electronic control.
4Device complexity
If rear wheel unlock braking system is used alone, then system design is simplified, but braking effect is poor
Solution Approach 1:
The patent makes the electric machine serve multiple functions: propulsion during normal operation and auxiliary braking when activated. This multi-functionality improves braking effect and reliability without requiring a dedicated braking motor, thereby avoiding increased system design complexity.
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 solution significantly enhances vehicle safety and reliability by improving deceleration capability and stability, extending the service life of the braking system, and reducing braking distance, while being cost-effective and practical for implementation.
Implementation Method 1
using motive power supplied by an electric machine on the vehicle together with a rear wheel unlock braking system to execute a braking operation
Data Source
AI summary
A vehicle braking control method includes activating an electronic parking brake system on a vehicle to perform a braking operation; checking whether a rear wheel unlock braking activation condition is met during the braking operation, and if it is met, acquiring a current vehicle stability characteristic. The method further includes determining whether the acquired vehicle stability characteristic is within a preset range; if it is, using motive power supplied by an electric machine on the vehicle together with a rear wheel unlock braking system to execute the braking operation, otherwise executing the braking operation with the rear wheel unlock braking system.