Hybrid Vehicle Braking Torque Control for Weight Variations
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Solution Overview
Problem
Existing hybrid powertrain systems face challenges in regulating regenerative braking, leading to inadequate or excessive deceleration due to varying vehicle weights, which affects fuel economy and brake wear, particularly in cargo-loaded vehicles.
Innovation Solution
A system and method that allow a driver to select maximum hybrid negative braking torque based on vehicle cargo weight, using a controller to manage regenerative and mechanical braking, ensuring consistent deceleration by limiting regenerative braking torque and supplementing with friction braking when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is activated in heavily loaded vehicles, then fuel economy is improved through energy recovery, but excessive friction braking wear occurs due to inadequate regenerative braking torque
Solution Approach 1:
The system dynamically adjusts the maximum regenerative braking torque based on real-time vehicle weight detection. The controller modifies the regenerative braking torque limit according to the actual cargo weight, ensuring optimal braking torque is applied for each loading condition. This dynamic adjustment allows heavily loaded vehicles to utilize maximum regenerative braking capability, reducing friction braking wear while improving fuel economy through energy recovery.
Solution Approach 2:
The system changes the regenerative braking torque parameter based on vehicle weight conditions. By detecting vehicle weight and adjusting the regenerative braking torque limit accordingly, the system optimizes the balance between energy recovery and brake wear prevention. Heavily loaded vehicles receive higher regenerative braking torque limits to maximize energy recovery and minimize friction brake usage.
2Object-generated harmful factors
If regenerative braking torque is increased for heavily loaded vehicles, then brake wear is reduced through energy recovery, but excessive deceleration and traction control issues occur in lightly loaded vehicles
Solution Approach 1:
The system dynamically adapts regenerative braking torque limits to match actual vehicle loading conditions. By continuously monitoring vehicle weight and adjusting the maximum regenerative braking torque in real-time, the system prevents both insufficient braking (which causes wear) and excessive braking (which causes traction loss). This dynamic adaptation ensures reliable traction control across all loading scenarios.
Solution Approach 2:
The system modifies the regenerative braking torque parameter based on detected vehicle weight. For lightly loaded vehicles, the regenerative braking torque limit is reduced to prevent excessive deceleration and traction control issues. For heavily loaded vehicles, the limit is increased to maximize energy recovery and reduce brake wear. This parameter adjustment ensures optimal performance and reliability across different operating conditions.
3Device complexity
If fixed regenerative braking torque is applied regardless of vehicle weight, then system complexity is minimized, but braking performance becomes inconsistent across different cargo weights
Solution Approach 1:
The braking system automatically detects vehicle weight and self-adjusts the regenerative braking torque limits without requiring manual intervention. The controller monitors vehicle loading conditions and autonomously modifies braking parameters to maintain consistent braking performance across different cargo weights. This self-service capability ensures reliable braking performance while keeping the user interface simple.
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 enhances fuel economy by minimizing friction braking reliance in heavily loaded vehicles and prevents traction issues in lightly loaded vehicles, providing a consistent braking experience across varying weight conditions.
Implementation Method 1
Regenerative braking recovers kinetic energy from a moving vehicle and utilizes the recovered energy to store electrical potential energy
Implementation Method 2
friction braking
Data Source
AI summary
A method, apparatus, and system are disclosed for hybrid power system braking. In one embodiment, a vehicle weight input is received by a brake controller. In response to receiving the vehicle weight input, a maximum negative braking torque is determined. Regulation of negative braking torque according to vehicle weight is accomplished by one or both of a regenerative braking device and mechanical braking device.