Decoupled Brake and ESC Layout With Shared Hydraulic Pressure
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Solution Overview
Problem
Traditional vehicle brake systems, including decoupled power brake (DPB) and electronic stability control (ESC) systems, are expensive and occupy significant space due to the need for large controllers and hydraulic pumps, leading to noise, vibration, and harshness issues.
Innovation Solution
A system with a decoupled power brake system as the primary hydraulic pressure generator and an electronic stability control system as a backup, utilizing a high-speed communication connection, primarily an Ethernet connection, to integrate a smaller backup hydraulic pressure generator and controller, reducing the size and complexity of the ESC system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DPB and ESC systems each include large hydraulic pumps and controllers, then braking functionality is ensured, but system cost and occupied space increase significantly
Solution Approach 1:
The patent merges the DPB hydraulic pressure generator and ESC hydraulic pressure generator into a single shared hydraulic pressure generator. This consolidation eliminates redundant components while maintaining the functional independence of both systems through electronic control, thereby reducing occupied space and system cost without compromising braking reliability
Solution Approach 2:
The single hydraulic pressure generator is designed to serve multiple functions: it provides hydraulic pressure for both the DPB system and the ESC system. The generator can operate in different modes depending on which system requires pressure, making it a universal component that replaces two separate specialized components
2Reliability
If traditional DPB and ESC systems each include large controllers, then respective functionalities are implemented, but system cost and complexity increase
Solution Approach 1:
The control architecture is segmented into distinct control modules: the DPB controller manages the decoupled power brake functions, while the ESC controller manages the electronic stability control functions. This segmentation allows each controller to be optimized for its specific function, reducing individual controller complexity while maintaining overall system functionality through coordinated operation
Solution Approach 2:
A communication interface acts as an intermediary between the DPB controller and ESC controller, enabling coordinated control of the shared hydraulic pressure generator. This mediator facilitates information exchange and coordination without requiring the controllers to be physically integrated, thereby reducing system complexity while maintaining functional reliability
3Power
If large hydraulic pumps are used in both DPB and ESC systems, then sufficient hydraulic pressure is generated, but noise, vibration, and harshness issues arise
Solution Approach 1:
By merging the hydraulic pressure generation function into a single unit, the patent eliminates the noise and vibration generated by a second redundant pump. The single hydraulic pressure generator is sized and designed to meet the combined demands of both DPB and ESC systems, reducing the total number of moving parts and associated harmful factors while maintaining sufficient power output
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 configuration reduces the size and cost of the ESC system, minimizes noise, vibration, and harshness, while maintaining essential braking functionalities, and enables efficient hydraulic pressure modulation through coordinated control between the DPB and ESC systems.
Implementation Method 1
a hydraulic pressure generator configured to generate hydraulic pressure in response to a pressure command signal
Implementation Method 2
a set of valves coupled to the set of hydraulically controlled brakes and configured to modulate hydraulic pressure applied to each of the hydraulically controlled brakes
Data Source
AI summary
Examples provide systems and methods for performing hydraulic braking in a vehicle. One system includes a set of hydraulically controlled brakes, a set of valves coupled to the set of brakes and configured to modulate hydraulic pressure applied to the brakes, a first hydraulic system including a primary hydraulic pressure generator, and a first controller, and a second hydraulic system including a backup hydraulic pressure generator and a second controller. The first controller is configured to receive sensor data. Based on the sensor data, the first controller determines an amount of hydraulic pressure to apply to each of the hydraulically controlled brakes, transmits a pressure command to the primary hydraulic pressure generator for generating hydraulic pressure, and transmits, using a high speed communication connection a valve control command to the second controller.