Coasting Brake Force Distribution Across Multiple Vehicle Actuators
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Solution Overview
Problem
During coasting driving, the actual braking force generated by a vehicle's actuators deviates from the target braking force expected by the user, leading to unsuitable braking performance due to independent operation of actuators based on individual control system requests.
Innovation Solution
A vehicular braking force control system comprising a coasting state detection unit, a target braking force calculation unit, and a braking force distribution control unit that collectively controls multiple actuators such as brakes, alternators, and transmissions to generate a distribution braking force that matches the target braking force, ensuring each actuator operates within its generable range and prioritizes actuators based on durability, fuel efficiency, and control stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If actuators operate independently based on individual control system requests, then each actuator can be controlled according to its own requirements, but the actual braking force deviates from the target braking force and braking performance becomes unsuitable
Solution Approach 1:
The patent merges the control of multiple actuators (brake, alternator, transmission) into a unified braking force distribution control system. The control device calculates target braking forces and distributes them to individual actuators based on their current states and capabilities, ensuring coordinated operation rather than independent control. This integration resolves the contradiction by achieving accurate overall braking force control while managing actuator coordination through a centralized control strategy.
2Ease of operation
If the braking force is left to take its natural course without centralized control, then the system operates simply, but the braking force does not match user expectations and driving stability deteriorates
Solution Approach 1:
The patent implements feedback control by continuously monitoring the actual braking force generated by actuators and comparing it with the target braking force. The control device adjusts the distribution of braking forces to individual actuators based on this feedback, ensuring that the actual braking force matches the target value and thereby meets user expectations. This feedback mechanism improves ease of operation while justifying the control system structure through its effectiveness.
Solution Approach 2:
The control system dynamically adjusts the braking force distribution to each actuator based on real-time vehicle conditions and actuator states. Rather than using fixed control strategies, the system adapts its control parameters dynamically to achieve the target braking force under varying conditions, improving ease of operation while managing complexity through adaptive control algorithms.
3Reliability
If multiple actuators are coordinated to achieve target braking force, then braking performance improves, but the control system complexity increases
Solution Approach 1:
The patent segments the overall braking force control into individual actuator control tasks. The control device calculates the target braking force and then distributes it to each actuator (brake, alternator, transmission) based on their individual capabilities and current states. This segmentation approach improves braking force consistency by ensuring each actuator operates within its optimal range while reducing control algorithm complexity through modular control strategies.
Data Source
AI summary
A vehicular breaking force control system includes: a plurality of actuators capable of generating a braking force for a vehicle; a coasting state detection unit configured to detect that a coasting state has been established; a target braking force calculation unit configured to calculate a target braking force on the basis of a state of the vehicle when the coasting state detection unit detects that the coasting state has been established; and a braking force distribution control unit configured to determine a distribution braking force that is a braking force to be caused to be generated by each actuator, such that the distribution braking force is equal to or less than a braking force generable by the actuator and a sum of the distribution braking forces is equal to the target braking force, and to perform control of causing each actuator to generate the distribution braking force.