Electrohydraulic Brake Pressure Accumulator for Dynamic Low-Energy Braking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrohydraulic brakes are inefficient in terms of energy consumption and dynamics during braking operations, lacking a mechanism for efficient energy recovery and pressure management.
Innovation Solution
An electrohydraulic brake system with a pressure accumulator and a pump system that allows hydraulic fluid to flow back and forth between the brake actuator and the accumulator, utilizing a controller to manage the flow and pressure for efficient energy recovery and dynamic braking, including a solenoid valve for fail-safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If hydraulic fluid is continuously pumped from the reservoir to the brake actuator during braking operations, then brake pressure build-up is achieved, but energy consumption increases significantly
Solution Approach 1:
The pressure accumulator is pre-filled with hydraulic fluid under pressure before braking operations begin. During braking, this pre-stored pressurized fluid is immediately available to supply the brake actuators, eliminating the need for the pump to build pressure from scratch and significantly reducing energy consumption during the braking process.
Solution Approach 2:
The system changes the pressure parameter of hydraulic fluid by storing it at high pressure in the accumulator during non-braking periods. This allows the pump to operate at lower power during braking by drawing from the high-pressure reservoir rather than continuously pumping from low-pressure conditions, optimizing the energy-power balance.
2Speed
If a large pump is used to quickly build brake pressure, then braking response speed is improved, but device complexity and energy consumption increase
Solution Approach 1:
The pressure accumulator is pre-charged with hydraulic fluid at high pressure before braking events occur. This preliminary action allows the system to achieve rapid brake pressure build-up without requiring an oversized pump, as the accumulator acts as a ready-to-discharge energy reservoir that can quickly supply pressurized fluid to multiple brake actuators simultaneously.
3Device complexity
If hydraulic fluid is stored in a simple reservoir without pressure accumulation, then device complexity is reduced, but braking dynamics and energy recovery are compromised
Solution Approach 1:
The pressure accumulator enables the hydraulic system to serve itself by automatically storing and releasing pressurized fluid based on braking demands. During braking, the accumulator discharges stored energy to maintain high brake pressure without requiring continuous pump operation, and during non-braking periods, the pump slowly recharges the accumulator, creating a self-regulating system that improves braking dynamics while managing complexity.
4Duration of action of moving object
If the pump operates continuously to maintain brake pressure during prolonged braking, then consistent braking force is maintained, but energy consumption increases
Solution Approach 1:
The system changes the operational parameters by switching from continuous pump operation to intermittent operation. The pressure accumulator maintains high brake pressure during prolonged braking by discharging stored fluid, allowing the pump to operate intermittently to recharge the accumulator rather than running continuously, thereby maintaining consistent braking force while dramatically reducing energy consumption.
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
The system achieves low energy consumption and high dynamic control of braking forces, with fail-safe functionality and efficient energy recovery during braking cycles.
Implementation Method 1
at least one pressure accumulator for pressurized storage of hydraulic fluid which originates from the hydraulic fluid reservoir
Implementation Method 2
During the regulation, hydraulic energy is buffered in the pressure accumulator in the form of pressurized hydraulic fluid
Implementation Method 3
a pump and a drive machine for the pump... hydraulic fluid flows back and forth or is conveyed back and forth between the at least one brake actuator and the pressure accumulator
Implementation Method 4
at least one pressure accumulator for pressurized storage of hydraulic fluid which originates from the hydraulic fluid reservoir, wherein in at least one flow connection, a valve device at least partially controllable by the electronic controller is arranged, which controls a flow of hydraulic fluid
Implementation Method 5
The hydraulic force transmission is easily scalable, so that drive machines of different powers can be used
Data Source
AI summary
An electrohydraulic brake for a vehicle, which includes an electronic controller having an implemented regulation function, which is carried out during a braking operation as needed in at least one regulating cycle, wherein during the regulating cycle, at least one brake pressure reduction and at least one brake pressure build-up take place in at least one hydraulic brake actuator. The electrohydraulic brake includes a hydraulic fluid reservoir, a pump, and at least one pressure accumulator. The electronic controller controls at least the drive machine for the pump and/or the valve device.