Dual Hydraulic Brake Pressure Supply for Electric Brake Reliability
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Solution Overview
Problem
Conventional electric brake systems face issues with unstable hydraulic pressure generation due to electrical component failures, leading to safety threats and the need for a direct mechanical connection to the wheel cylinder during abnormal operations, and require reinforcement of braking force when the main components are underperforming.
Innovation Solution
The electric brake system incorporates a dual hydraulic pressure supply system with a first hydraulic pressure supply device and a second hydraulic pressure supply device, including hydraulic pumps, to ensure stable hydraulic pressure generation. It features a hydraulic control device with multiple passages and valves to regulate pressure flow, an electronic control unit, and a pedal simulator for stable pedal feedback, allowing for normal, additional, and abnormal operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electric brake system is used to enable complex and diverse braking operations, then braking functionality is improved, but reliability deteriorates due to electrical component failures
Solution Approach 1:
The brake system is divided into two independent subsystems: a first hydraulic pressure supply device with a hydraulic piston for normal operation, and a second hydraulic pressure supply device with a hydraulic pump for abnormal operation. This segmentation ensures that if one subsystem fails, the other can still provide braking functionality, thereby maintaining reliability while preserving complex braking operations.
Solution Approach 2:
The system incorporates a backup hydraulic pressure supply mechanism (second hydraulic pressure supply device) that is activated when the primary system fails. This beforehand cushioning approach ensures that braking capability is maintained even when electrical components fail, addressing the reliability concern while preserving the adaptability of the electric brake system.
2Reliability
If a dual hydraulic pressure supply system is added to improve reliability, then system reliability is improved, but device complexity increases
Solution Approach 1:
The hydraulic control device is designed to perform multiple functions: it controls hydraulic pressure flow during normal operation through the first hydraulic pressure supply device, and switches to controlling the second hydraulic pressure supply device during abnormal operation. This multi-functionality reduces the need for separate dedicated control mechanisms for each subsystem, thereby limiting the increase in device complexity while maintaining improved reliability.
3Ease of manufacture
If the pedal unit is separated from the hydraulic pressure providing unit, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
The brake system is physically separated into distinct modules: a pedal unit that detects driver input and an independent hydraulic pressure providing unit that generates braking pressure. This segmentation allows each module to be manufactured, tested, and assembled separately, improving ease of manufacture and assembly performance while the modular design actually reduces overall system complexity through standardized interfaces.
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 ensures reliable braking performance with improved safety and operational reliability, reduces manufacturing costs, and enhances assembly performance and productivity by separating the pedal unit from the hydraulic pressure providing unit, facilitating installation and space utilization.
Implementation Method 1
a first hydraulic pressure supply device that generates the hydraulic pressure by operating a hydraulic piston by the electric signal output in response to the displacement of the brake pedal
Implementation Method 2
a second hydraulic pressure supply device that generates the hydraulic pressure by operating a hydraulic pump by the electric signal output in response to the displacement of the brake pedal
Implementation Method 3
a hydraulic control device that controls a flow of the pressurized medium provided from the first hydraulic pressure supply device or recovered to the first hydraulic pressure supply device
Data Source
AI summary
An electric brake system includes a hydraulic pressure providing unit that generates a hydraulic pressure of a pressurized medium for braking a vehicle based on an electric signal output in response to a displacement of a brake pedal, in which the hydraulic pressure providing unit includes a first hydraulic pressure supply device that generates the hydraulic pressure by operating a hydraulic piston, a hydraulic control device that controls a flow of the pressurized medium provided from the first hydraulic pressure supply device or recovered to the first hydraulic pressure supply device, a hydraulic circuit that regulates the hydraulic pressure of the pressurized medium applied to a plurality of wheel cylinders, and a second hydraulic pressure supply device that generates the hydraulic pressure by operating a hydraulic pump by the electric signal output in response to the displacement of the brake pedal.