Continuously Adjustable Valve Braking System for Hybrid Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional braking systems face challenges in preventing brake pressure buildup in wheel brake cylinders during driver actuation, which limits the effectiveness of recuperative braking and increases energy consumption and emissions, especially in hybrid and electric vehicles.
Innovation Solution
The braking system incorporates continuously adjustable valves in the wheel brake cylinders and a control device that manages the opening of wheel outlet valves to prevent brake pressure buildup, allowing for efficient energy recovery through recuperative braking without exceeding the setpoint total brake force, and includes a cost-effective design using switching valves for certain cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional switching valves are used in wheel brake cylinders, then the system structure is simple, but brake pressure buildup cannot be prevented during driver actuation, limiting recuperative braking effectiveness
Solution Approach 1:
The patent replaces conventional switching valves with continuously adjustable valves in the wheel brake cylinders. These valves can dynamically modulate brake pressure between fully closed and fully open states, enabling precise control during driver actuation. This dynamic adjustment allows the system to prevent brake pressure buildup while maintaining structural feasibility, thereby resolving the contradiction between valve simplicity and recuperative braking efficiency.
2Reliability
If mechanical free travel is implemented in conventional braking systems, then brake pressure can be limited, but the design complexity increases significantly
Solution Approach 1:
The patent substitutes the mechanical free travel mechanism with an electrically controlled continuously adjustable valve system. Instead of using complex mechanical components to limit brake pressure, the system employs electronically actuated valves that can be precisely controlled to modulate brake pressure in the wheel brake cylinders. This replacement eliminates mechanical complexity while maintaining reliable brake pressure control, directly resolving the stated contradiction.
3Productivity
If wheel outlet valves are opened to prevent brake pressure buildup, then recuperative braking efficiency improves, but brake pressure control precision must be maintained
Solution Approach 1:
The continuously adjustable valves provide dynamic control capability that enables precise modulation of brake pressure while maintaining high recuperative braking efficiency. The valves can be adjusted in real-time based on driver actuation signals, allowing the system to prevent brake pressure buildup without sacrificing control precision. This dynamic adjustment mechanism resolves the contradiction between productivity improvement and precision maintenance.
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 enables high recuperative efficiency, reduces energy consumption and emissions, maintains standard braking feel, and avoids the complexity of mechanical free travel, allowing a high proportion of brake force to be achieved through recuperative braking without exceeding the setpoint total brake force.
Implementation Method 1
The braking system includes a master brake cylinder and two brake circuits, each with a storage chamber and two wheel brake cylinders, a wheel outlet valve designed as a switching valve being associated with each of the wheel brake cylinders. By opening at least one of the wheel outlet valves for each brake circuit, the aim is to prevent an increase in brake pressure in the particular brake circuit
Implementation Method 2
at least one generator for recovering kinetic energy via recuperative braking. Recuperative braking is understood to mean an operation in which at least one electric motor, as the at least one generator which may also be usable as at least one electric drive motor of the vehicle, is operated in generator mode in such a way that a braking torque is effectuated with the aid of the at least one electric motor/generator. Electrical energy that is recovered in this way may be fed back into a store
Data Source
AI summary
A braking system is described for a vehicle, including a master brake cylinder, a first brake circuit with a first storage chamber, a first wheel brake cylinder, and a second wheel brake cylinder, the first wheel brake cylinder being hydraulically connected to the first storage chamber via a first wheel outlet valve, and the second wheel brake cylinder being hydraulically connected to the first storage chamber via a second wheel outlet valve, and including a second brake circuit with a second storage chamber, a third wheel brake cylinder, and a fourth wheel brake cylinder, the third wheel brake cylinder being hydraulically connected to the second storage chamber via a third wheel outlet valve, and the fourth wheel brake cylinder being hydraulically connected to the second storage chamber via a fourth wheel outlet valve. The first wheel outlet valve and the third wheel outlet valve are in each case continuously adjustable valves. Moreover, also described is a method for operating a braking system of a vehicle.