Dynamic Brake Booster Amplification for Anti-Lock Control
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Solution Overview
Problem
Conventional hydraulic vehicle brake systems with electromechanical brake boosters face inefficiencies during anti-lock control, leading to increased power consumption, thermal load, and noise, as they maintain high master brake cylinder pressure and external force, which affects the service life of hydraulic components and driver feedback.
Innovation Solution
The method reduces the external force of the electromechanical brake booster during anti-lock control by decreasing its amplification, allowing for reduced master brake cylinder pressure and power consumption, while maintaining sufficient brake pressure through controlled regulation of the brake booster and hydraulic pumps, thereby minimizing load on hydraulic components and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake booster maintains high external force during anti-lock control, then sufficient brake pressure is available for all braking conditions, but power consumption and thermal load increase
Solution Approach 1:
The brake booster's external force is made dynamically adjustable rather than static. During anti-lock control, the amplification factor is reduced to lower the external force, while during normal braking it is increased to provide sufficient brake pressure. This dynamic adaptation resolves the contradiction between maintaining high force for all conditions and reducing power consumption during specific operations.
Solution Approach 2:
The amplification parameter of the brake booster is changed based on operating conditions. By reducing the amplification parameter during anti-lock control and increasing it during normal braking, the system optimizes the balance between providing sufficient brake pressure and minimizing power consumption and thermal load.
2Force
If the brake booster maintains high external force during anti-lock control, then brake pressure is sufficient for all braking scenarios, but thermal load on the brake booster increases
Solution Approach 1:
The external force output of the brake booster is dynamically adjusted based on the braking mode. During anti-lock control, the amplification is reduced which directly lowers the thermal load, while during normal braking the amplification is increased to ensure sufficient brake pressure. This dynamic adjustment resolves the contradiction between maintaining high force and reducing thermal load.
3Stress or pressure
If high master brake cylinder pressure is maintained during anti-lock control, then brake pressure is available for all conditions, but load on hydraulic components increases reducing service life
Solution Approach 1:
The master brake cylinder pressure parameter is changed based on the braking mode. During anti-lock control, the pressure is reduced to minimize load on hydraulic components and extend their service life. During normal braking, the pressure is increased to ensure sufficient brake force. This parameter adaptation resolves the contradiction between maintaining high pressure for all conditions and preserving component reliability.
4Stress or pressure
If high master brake cylinder pressure is maintained during anti-lock control, then sufficient brake pressure is available, but noise generated by the wheel slip control device increases
Solution Approach 1:
The pressure parameter in the hydraulic system is reduced during anti-lock control to minimize noise generation by the wheel slip control device. By lowering the master brake cylinder pressure during this specific operation, the harmful noise effect is reduced while sufficient brake pressure is still maintained through the reduced amplification of the brake booster.
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 approach reduces power consumption and thermal load on the brake booster and on-board electrical system, extends the service life of hydraulic components, and decreases noise during anti-lock control by optimizing the external force and master brake cylinder pressure.
Implementation Method 1
an electromechanical brake booster with a hollow-shaft electric motor, the rotor of which has a nut of a spindle drive, which converts the rotary drive movement of the electric motor into a translational movement to actuate the master brake cylinder
Implementation Method 2
a hydraulic pump for each brake circuit, an isolating valve with which the brake master cylinder can be hydraulically separated from the brake circuit
Data Source
Figure 1
AI summary
The invention relates to a method for operating a hydraulic vehicle braking system (1) that has an anti-lock control unit (12), the brake master cylinder of said system (2) having an electromechanical brake booster (13). As the pressure level of the vehicle braking system (1) decreases during an anti-lock control, in which all vehicle wheels are controlled, according to the invention the boosting force of the brake booster (13) is reduced in an anti-lock control of this type.