Brake Booster Input Member Shift for Hydraulic Pressure Relief
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Solution Overview
Problem
Existing hydraulic braking systems for motor vehicles with electrified drive trains face complexity and inefficiency in utilizing recuperation potential during pure recuperative braking, leading to grinding torques on wheel-side brake actuators.
Innovation Solution
A method where the second input member of the brake booster is shifted directly back from the actuation position without intermediate movements, reducing energy consumption and achieving pressure relief comparable to existing methods but faster and simpler, with a smaller backward shift distance and speed to minimize driver noticeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the second input member is shifted back from the actuation position in the direction of the pressure generation unit to relieve hydraulic pressure, then grinding torques are reduced and recuperation potential is utilized, but the system complexity and energy consumption increase due to intermediate movements and additional volume displacement
Solution Approach 1:
The patent extracts and eliminates the intermediate movement step from the pressure relief process. Instead of moving the second input member forward to displace additional brake fluid volume and then moving it back, the system directly shifts the second input member back from the actuation position to relieve pressure. This removes unnecessary complexity while achieving the same grinding torque reduction effect.
Solution Approach 2:
The brake booster system uses its own existing components (the second input member and its backward shift capability) to achieve pressure relief without requiring additional components or complex control sequences. The system serves itself by utilizing the natural backward shift of the second input member to displace brake fluid and relieve hydraulic pressure, eliminating the need for separate pressure relief mechanisms.
2Object-generated harmful factors
If the second input member is shifted back from the actuation position to relieve hydraulic pressure, then grinding torques are reduced, but energy consumption increases due to additional displacement movements
Solution Approach 1:
The patent removes the energy-consuming intermediate movement step from the pressure relief process. By eliminating the forward displacement of the second input member that was previously required to create additional brake fluid volume, the system achieves pressure relief through a single, more efficient backward shift, significantly reducing energy consumption.
Solution Approach 2:
The system utilizes the natural backward movement of the second input member (which occurs when brake pedal force is released) to achieve pressure relief without requiring additional energy input. The elastic element's relaxation naturally drives the second input member backward, converting stored elastic energy into useful pressure relief action rather than requiring separate actuation.
3Stress or pressure
If the second input member is shifted back from the actuation position to relieve hydraulic pressure, then pressure relief is achieved, but the process time increases due to intermediate movements
Solution Approach 1:
The patent extracts and eliminates the time-consuming intermediate movement steps from the pressure relief sequence. By removing the forward displacement phase and the isolation step, the system achieves pressure relief through a single direct backward shift of the second input member, significantly reducing the overall process time while maintaining effective pressure reduction.
Solution Approach 2:
The patent skips unnecessary intermediate steps in the pressure relief process. Instead of methodically moving through multiple phases (forward displacement, isolation, then backward movement), the system rushes directly to the essential action of shifting the second input member backward to relieve pressure, achieving faster response time without sacrificing effectiveness.
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 simplifies the braking system, enhances energy efficiency, reduces grinding torques, and allows for a high utilization of recuperation potential over a prolonged period without additional components, maintaining normal driver feedback and system behavior.
Implementation Method 1
couple the second input member and the output member to one another via a resilient element such as a spring, so that the second input member and the output member of the brake booster move in unison except for a possible deformation of the resilient element
Implementation Method 2
a hydraulic system is relieved of pressure, for which the second input member of the brake booster, together with the output member, is initially displaced a certain distance beyond the actuation position in the direction of the pressure generation unit. In this way, an additional volume of brake fluid or hydraulic fluid is displaced into a fluid reservoir
Data Source
AI summary
The disclosure relates to a method for operating a hydraulic braking system for a motor vehicle with an electrified drive train. The braking system comprises a brake booster. First, a braking request is registered and it is determined that the braking request is to be met by pure recuperative braking. In addition, an input member of the brake booster is shifted in the direction of a pressure generation unit so that it assumes an actuation position corresponding to the braking request. From here, the input member is then shifted back from the actuation position in a direction away from the pressure generation unit for hydraulic pressure relief. A control unit designed to carry out such a method is also disclosed. A braking system comprising such a control unit is also presented.