Vehicle Braking Control Using Hydraulic and Drive Force Blending
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Solution Overview
Problem
Traditional hydraulic brake systems lack flexibility in regulating braking forces, making it difficult to implement comfortable braking functions effectively.
Innovation Solution
A method and device that determine a comfortable braking force based on brake pedal openness and current hydraulic braking force, requesting drive force from a vehicle control unit to adjust the total braking force, incorporating regenerative and hydraulic braking forces for smoother braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional hydraulic brake systems are used, then braking function is provided, but flexibility in regulating braking forces is insufficient
Solution Approach 1:
The patent combines regenerative braking system and hydraulic braking system into a unified brake system. The control device integrates both braking mechanisms to work together, allowing flexible regulation of total braking force by coordinating the drive braking force from regenerative braking and hydraulic braking force, thereby resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The patent implements dynamic regulation of braking forces by continuously adjusting the distribution between regenerative braking and hydraulic braking based on real-time conditions. The control device dynamically modifies braking force allocation to optimize comfort and efficiency, enabling flexible adaptation without requiring a completely complex system redesign.
2Speed
If hydraulic braking force is increased for faster stopping, then braking speed improves, but deceleration shock increases reducing comfort
Solution Approach 1:
The patent applies preliminary action by using regenerative braking first to provide the majority of braking force during the initial deceleration phase. This preliminary regenerative braking reduces the need for abrupt hydraulic braking intervention, thereby minimizing deceleration shock while maintaining effective braking speed. The hydraulic brake is prepared but not fully engaged until necessary.
Solution Approach 2:
The patent changes the parameter distribution between two braking mechanisms - shifting from relying primarily on hydraulic braking to a coordinated approach where regenerative braking provides the primary deceleration force. This parameter change in braking force distribution smooths the deceleration profile, reducing shock while maintaining braking effectiveness.
3Use of energy by moving object
If regenerative braking is used to reduce hydraulic braking, then energy efficiency improves, but braking force regulation flexibility decreases
Solution Approach 1:
The patent makes the brake system universal by enabling it to operate in multiple modes - pure regenerative braking, pure hydraulic braking, and combined braking. The control device can select and switch between different braking combinations based on energy efficiency requirements and braking force regulation needs, thereby achieving both energy efficiency and flexibility through multi-functionality.
Solution Approach 2:
The patent creates a composite braking system that combines two different braking mechanisms (regenerative and hydraulic) into a unified system. This composite approach allows the system to leverage the energy efficiency of regenerative braking while maintaining the flexibility and immediate response of hydraulic braking, achieving both objectives simultaneously through systematic integration.
Data Source
AI summary
A method, a device, a controller, and a computer program product for comfortable braking are disclosed. The method includes (i) determining a comfortable braking force based on an openness of a brake pedal of a vehicle, (ii) obtaining a current hydraulic braking force of the vehicle, (iii) requesting a drive force from a vehicle control unit in response to the hydraulic braking force being greater than the comfortable braking force, and (iv) performing comfortable braking on the vehicle based on the hydraulic braking force and the drive force. The above method enables the realization of the comfortable braking function with the participation of hydraulic brakes, which improves the flexibility of the comfortable braking by simultaneously utilizing the hydraulic braking force and the drive force, and expands the application scene of the comfortable braking, thereby improving the ride experience of drivers and passengers.