Hybrid Vehicle Braking Torque Control on Slopes
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Solution Overview
Problem
Conventional vehicle braking methods require frequent mechanical braking, leading to wear and increased maintenance costs, as well as inconsistent braking torque, affecting safety and riding comfort.
Innovation Solution
A method and device that control electric and mechanical braking torque based on vehicle state information, including mass, deceleration, current gradient, and speed, to optimize braking precision and comfort by selectively applying electric or mechanical braking torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent mechanical braking is applied to ensure required braking torque, then braking reliability is improved, but braking system wear increases and maintenance costs increase
Solution Approach 1:
The patent replaces frequent mechanical braking with electric braking (regenerative braking) as the primary braking method. The control system prioritizes electric braking torque to reduce mechanical brake wear while maintaining braking reliability, using mechanical braking only when necessary to supplement insufficient electric braking torque.
Solution Approach 2:
The patent dynamically adjusts braking torque distribution by changing the parameter of braking force source selection. The control system monitors vehicle state (speed, acceleration, power output) and dynamically switches between electric and mechanical braking based on real-time conditions, optimizing the balance between reliability and wear reduction.
2Reliability
If frequent mechanical braking is applied to provide required braking torque, then braking reliability is improved, but riding comfort deteriorates due to frequent braking torque changes
Solution Approach 1:
The patent substitutes mechanical braking with electric braking to eliminate the harsh torque changes associated with mechanical brake engagement. Electric braking provides smooth, continuous torque control that maintains braking reliability while significantly improving riding comfort by avoiding sudden mechanical interference.
Solution Approach 2:
The control system dynamically adjusts braking torque distribution based on real-time vehicle state parameters (acceleration, speed, power output). This dynamic control enables smooth transitions between braking phases and maintains optimal braking torque without abrupt changes, improving both reliability and comfort simultaneously.
3Ease of repair
If electric braking torque is used to reduce mechanical wear, then maintenance costs are reduced, but braking precision may be insufficient on slopes
Solution Approach 1:
The patent segments the braking system into two independent components: electric braking (for normal operation and wear reduction) and mechanical braking (for precision control on slopes). The control system intelligently divides braking tasks between these segments, using electric braking for routine deceleration and mechanical braking for precision control when needed, thereby maintaining both low maintenance costs and high braking precision.
Solution Approach 2:
The patent merges electric braking and mechanical braking into a unified hybrid braking system. The control system coordinates both braking sources, using their combined capabilities to achieve precise braking control on slopes while minimizing mechanical wear through optimized torque distribution. This merging allows the system to leverage the advantages of both braking types simultaneously.
Data Source
AI summary
A braking method for a vehicle is provided. The method includes the following steps: obtaining a first state information of the vehicle, where the first state information includes a vehicle mass and a deceleration required by braking; calculating a braking torque required by the vehicle according to the first state information, and controlling an output of an electric braking torque according to the braking torque required by the vehicle; obtaining a current gradient and a current vehicle speed of the vehicle; and determining whether to control the vehicle to unload the electric braking torque, and whether to control the vehicle to apply a mechanical braking torque according to the current vehicle speed, the braking torque required by the vehicle, the deceleration required by braking, and the current gradient. A braking device for a vehicle and a vehicle are further provided.