Electromotive Brake Pressure Modulator with Integrated Piston-Cylinder
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Solution Overview
Problem
Modern brake systems face challenges in achieving optimal braking performance due to non-linear pressure reduction speed, increased complexity, and energy consumption, particularly in systems that require redundant electrical systems and are prone to failure under harsh conditions.
Innovation Solution
A compact brake system utilizing a single piston-cylinder unit for power-assisted braking and regulation, with an electromotive drive that allows for variable pressure control and reduction, reducing installation space, energy consumption, and pedal force requirements, while maintaining braking effectiveness even in energy supply failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a hydraulic unit with solenoid valves and multi-piston pumps is used for power-assisted braking and regulation, then braking force control is achieved, but the device complexity increases and installation space is required
Solution Approach 1:
The patent combines the power-assisted braking function and the regulation function into a single integrated piston-cylinder unit. The electromotive drive device integrates both the electric motor and the gear device within one compact assembly, eliminating the need for separate hydraulic units with multiple solenoid valves and multi-piston pumps. This merging reduces device complexity while maintaining automated braking force control.
Solution Approach 2:
The single piston-cylinder unit is designed to perform multiple functions: it provides power-assisted braking through the electromotive drive, enables regulation through the non-hydraulic gear device, and maintains braking effectiveness in failure conditions. This multi-functionality allows one component to replace what would traditionally require multiple specialized components, reducing overall system complexity.
2Extent of automation
If conventional solenoid valves are used for pressure regulation, then braking force control is possible, but the pressure reduction speed becomes non-linear and braking distance increases
Solution Approach 1:
The patent replaces the conventional solenoid valve-based pressure regulation system with an electromotive drive system that uses a non-hydraulic gear device. This substitution allows for more precise and linear control of pressure reduction speed, as the electromotor can be controlled to provide consistent rotational speed to the gear mechanism, eliminating the non-linear characteristics inherent in solenoid valve operation.
Solution Approach 2:
The invention changes the control parameter from electrical voltage control (solenoid valves) to rotational speed control (electromotor). By controlling the rotational speed of the electromotor and the gear ratio of the non-hydraulic gear device, the system achieves linear and predictable pressure reduction speed, improving braking performance and reducing braking distance.
3Reliability
If electromechanical braking systems with electric motors at wheel brakes are used, then braking capacity is maintained, but additional redundant on-board electrical systems are required
Solution Approach 1:
The patent extracts the electromotive drive from the wheel brake location and places it at the master cylinder location. Instead of having electric motors at each wheel brake, the system uses a single electromotive drive to control the master cylinder piston. This extraction eliminates the need for multiple redundant electrical systems while maintaining braking capacity through centralized control.
4Volume of stationary object
If a compact piston-cylinder unit is used, then installation space is reduced, but the drive device must be highly integrated
Solution Approach 1:
The patent implements a nested structure where the gear device is integrated within the piston-cylinder assembly, and the electromotor is positioned to directly drive the gear device. The non-hydraulic gear device is arranged concentrically or adjacently to the piston, allowing multiple components to occupy the same spatial envelope. This nesting achieves compact installation space while managing integration complexity through systematic component arrangement.
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 rapid pressure adjustments, reduced braking distance, lower pedal forces, and improved driving stability with reduced energy consumption and complexity, enabling efficient operation under various conditions.
Implementation Method 1
a control and regulating device, the control and regulating device controlling an electromotive drive device using the movement and/or position of the actuating device
Implementation Method 2
the drive device adjusting a piston of a piston-cylinder system via a non-hydraulic gearing device
Data Source
AI summary
The invention relates to a brake system which comprises an actuating device (26), especially a brake pedal (30), and a control/regulation device (22). Said control/regulation device (22) controls at least one electromotive drive device (7a, 7b, 8) in response to the movement and/or position of the actuating device (26). The drive device adjusts a piston (1, 1a, 1b) of a piston/cylinder system via a non-hydraulic transmission device, thereby adjusting a pressure in the working compartment (4′, 4′a, 4b′) of the cylinder. Said working compartment is connected to a wheel brake (15, 17) via a pressure conduit (13, 13a). A valve (14, 14a, 15, 15a, 14′, 14a′) is interposed between the brake cylinder of the wheel brake and the working compartment of the piston/cylinder system. The control/regulation device opens the valve for pressure suppression or pressure build-up in the brake cylinder and closes it in order to maintain the pressure in the brake cylinder.