Brake Pump-Valve Arrangement for Front Axle Pressure Amplification
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Solution Overview
Problem
Existing brake systems for motor vehicles fail to ensure safe and comfortable braking when the electrically controllable pressure supply of the main brake system is compromised, particularly affecting the rear axle and compromising vehicle stability.
Innovation Solution
A method and brake system utilizing a pump-valve arrangement that builds up wheel brake pressure on the front axle to a level greater than the master cylinder pressure, while applying master cylinder pressure to the rear axle wheel brakes, with a hydraulic connection ensuring the master cylinder pressure is applied to the rear axle, even when the electric supply is de-energized, and using pressure detection devices to regulate and amplify brake pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump-valve arrangement builds up wheel brake pressure on the front axle to a level greater than master cylinder pressure, then braking performance on the front axle is improved, but the hydraulic system complexity increases
Solution Approach 1:
The brake system is divided into two independent hydraulic circuits: one for the front axle with pump-valve arrangement and one for the rear axle with direct master cylinder connection. This segmentation allows each circuit to operate independently with optimized pressure control, improving front axle braking performance while maintaining rear axle simplicity through the fallback connection.
Solution Approach 2:
The pump-valve arrangement acts as an intermediary device between the master cylinder and front axle wheel brakes. It receives hydraulic pressure from the master cylinder and amplifies it to a higher level for the front axle, enabling improved braking performance without requiring a completely separate high-pressure source.
2Stability of the object's composition
If the master cylinder pressure is applied to the rear axle wheel brakes, then vehicle stability is maintained, but the braking force on the rear axle is reduced compared to front axle
Solution Approach 1:
Different pressure levels are applied to different axles according to their specific requirements: high amplified pressure from the pump-valve arrangement is applied to the front axle for maximum braking effect, while the original master cylinder pressure is applied to the rear axle to maintain stability and prevent lockup, creating locally optimized braking characteristics for each axle.
3Productivity
If the pump-valve arrangement is used to amplify brake pressure, then braking effectiveness is improved, but the energy consumption increases
Solution Approach 1:
The pump-valve arrangement uses hydraulic principles to amplify the driver's brake pedal input. By utilizing hydraulic pressure multiplication through the pump mechanism, the system achieves enhanced braking effectiveness without requiring additional electrical energy input, converting mechanical pedal force into amplified hydraulic pressure for the front axle.
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 enhances braking performance by maintaining maximum braking potential and rear axle stability while providing a comfortable brake pedal feel by reducing pedal travel and ensuring reliable pressure application, even in the absence of electrical power.
Implementation Method 1
the build-up of wheel brake pressure on the wheel brakes of the front axle to a pressure value greater than the master cylinder pressure is the pumps of the pump-valve arrangement
Implementation Method 2
the brake pressure of the master cylinder is applied to the wheel brakes of the rear axle
Data Source
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AI summary
The invention relates to a method for operating a motor vehicle brake system comprising a primary brake system (10, 20; 110) with a main brake cylinder (100) actuatable by a brake pedal and connected to hydraulic wheel brakes (151a-151d) of a front axle (VA) and a rear axle (HA), an electrically controllable pressure supplying device (292, 190) connected to the wheel brakes, and an electrically controllable pressure modulation device (150) for adjusting the brake pressure of individual wheels with at least one inlet valve (152a-152d) for each of the wheel brakes, and comprising a pump-valve arrangement (30) arranged hydraulically between the primary brake system (12, 20; 110) and the wheel brakes of the front axle, the pump-valve arrangement (30) comprising, for each wheel brake of the front axle, a first valve (5) arranged between the corresponding inlet valve of the primary brake system and the wheel brake, and an electrically controllable pump (50) with a suction connection (41) and a pressure connection (42), the pressure connection (42) being connected to the wheel brake. In the event of (A) a pre-determined condition of the primary brake system and (B) an actuation of the main brake cylinder by the driver of the vehicle, a build-up of wheel brake pressure on the wheel brakes of the front axle is carried out by the pump-valve arrangement, the pressure (Ppump) set by the pump-valve arrangement being higher than the brake pressure (PHZ) in the main brake cylinder, while the brake pressure (PHZ) of the main brake cylinder is applied to the wheel brakes of the rear axle. The invention also relates to motor vehicle brake systems.