Hybrid Torque Distribution Adapting to Braking State
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid vehicles face challenges in optimizing torque distribution between the front and rear axles while minimizing electrical consumption, particularly in scenarios where the braking regulation system is activated, leading to unnecessary energy draw from the high-voltage battery.
Innovation Solution
A method that dynamically adjusts torque distribution from an optimal 4x4 mode to a 'degraded' mode as the vehicle travels without activating the braking regulation, where the heat engine transmits more torque, and transitions back to optimal mode upon braking system activation, using a gradient-based approach to manage torque distribution based on distance traveled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque is distributed to the rear axle via the electric machine for optimal 4x4 traction, then trajectory restoration capability is improved, but electrical consumption from the high-voltage battery increases
Solution Approach 1:
The torque distribution strategy dynamically adapts based on the operating state. When braking regulation is activated, the system transitions to a homogeneous torque distribution (optimal for trajectory restoration). When braking regulation is not activated, the system transitions to a front-biased torque distribution (optimal for energy saving). This dynamic adaptation resolves the contradiction by applying different torque distribution strategies based on real-time vehicle state.
Solution Approach 2:
The patent changes the torque distribution parameters based on the activation state of the braking regulation system. The front/rear torque split ratio is adjusted between two extreme configurations: homogeneous distribution (e.g., 50/50 or 40/60) when braking regulation is active, and front-biased distribution (e.g., 80/20 or 90/10) when it is inactive. This parameter change allows the system to optimize between trajectory control capability and energy consumption.
2Use of energy by moving object
If all torque is transmitted by the front axle to limit electrical consumption, then energy efficiency is improved, but trajectory restoration capability deteriorates
Solution Approach 1:
The system dynamically switches between front-biased torque distribution (for energy efficiency) and homogeneous torque distribution (for trajectory restoration) based on whether the braking regulation system is activated. This dynamic switching ensures that the vehicle maintains optimal energy efficiency during normal driving while automatically gaining trajectory restoration capability when braking regulation is needed.
Solution Approach 2:
The system prepares for potential trajectory restoration needs by maintaining the capability to quickly transition to homogeneous torque distribution when braking regulation is activated. The control system is pre-configured to immediately adjust torque distribution parameters upon detection of braking regulation activation, ensuring that trajectory restoration capability is available when needed without continuous energy consumption.
Data Source
Figure 1~2
AI summary
The invention essentially relates to a method for distributing torque between the front end (2) and the rear end (3) of a hybrid vehicle (1). According to the invention, the greater the distance (D) travelled without activating a brake control function (E), the more the distribution (R) of the requested torque (Cglob) is altered in order to move from a first torque distribution (r1) that is optimum in terms of driveability to a second degraded torque distribution (r2) in which the end (2) associated with the heat engine (7) transmits more torque than in the first distribution (r1).