Vehicle Brake Pressure Control Using Dual Pressurizing Units
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Solution Overview
Problem
The existing brake device for vehicles faces challenges in controllability when regulating hydraulic pressure in the wheel cylinder using the second pressurizing unit, due to pressure loss in the communication passage, leading to increased time to reach the target hydraulic pressure.
Innovation Solution
The brake device incorporates a first pressurizing unit to assist the second pressurizing unit by operating the first pressurizing unit when increasing hydraulic pressure in the wheel cylinder, thereby reducing the time required to reach the target pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only the second pressurizing unit is operated to increase the hydraulic pressure in the wheel cylinder, then the brake control can be simplified, but the time required to reach the target hydraulic pressure increases due to pressure loss in the communication passage
Solution Approach 1:
The patent combines the operation of the first pressurizing unit and the second pressurizing unit to increase hydraulic pressure in the wheel cylinder. When the second pressurizing unit is operated to supply brake fluid from the reservoir tank, the first pressurizing unit is simultaneously operated to assist in increasing the hydraulic pressure, thereby compensating for the time delay caused by pressure loss in the communication passage while maintaining relatively simple brake control logic.
2Loss of time
If the first pressurizing unit is operated to assist the second pressurizing unit, then the time to reach target hydraulic pressure is reduced, but the device complexity and control complexity increase
Solution Approach 1:
The patent implements dynamic control of the pressurizing units based on real-time hydraulic pressure conditions. The brake control unit monitors the hydraulic pressure in the wheel cylinder and dynamically determines whether to operate the first pressurizing unit alone, the second pressurizing unit alone, or both units together. This dynamic operation strategy optimizes the balance between response time and system complexity by activating the first pressurizing unit only when necessary to compensate for pressure loss.
3Reliability
If the first pressurizing unit is operated to assist the second pressurizing unit, then the controllability of hydraulic pressure regulation is improved, but the energy consumption increases
Solution Approach 1:
The patent employs feedback control where the brake control unit continuously monitors the hydraulic pressure in the wheel cylinder and adjusts the operation of the pressurizing units accordingly. When the second pressurizing unit is operated to supply brake fluid from the reservoir tank, the system detects the pressure loss in the communication passage and activates the first pressurizing unit to assist only to the extent necessary to achieve the target hydraulic pressure, thereby improving controllability while minimizing unnecessary energy consumption.
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 improves controllability and reduces the delay in increasing hydraulic pressure, ensuring rapid brake force application during brake control operations like ESC and TRC.
Implementation Method 1
a first pressurizing unit configured to increase, by supplying brake fluid into a wheel cylinder provided in a wheel of a vehicle, a hydraulic pressure in the wheel cylinder
Implementation Method 2
a second pressurizing unit connected to a reservoir tank via a communication passage and configured to increase, by supplying the brake fluid taken in from the reservoir tank into the wheel cylinder, the hydraulic pressure in the wheel cylinder
Data Source
AI summary
A brake device includes: a first pressurizing unit configured to increase a WC pressure by supplying brake fluid into wheel cylinders provided in wheels RL and RR; a second pressurizing unit connected to a reservoir tank via a fourth flow passage and configured to increase the WC pressure by supplying the brake fluid taken in from the reservoir tank into the wheel cylinders; and a brake control unit configured to control at least one of the first pressurizing unit and the second pressurizing unit based on a target WC pressure. The brake control unit is configured to, when the WC pressure is to be increased by operating the second pressurizing unit, execute an auxiliary brake control in which the first pressurizing unit is operated to assist the second pressurizing unit to increase the WC pressure.