Vehicle Braking Control Device for Faster Deceleration
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Solution Overview
Problem
In automatic braking systems, the increase in braking force on rear wheels is limited when both hydraulic pressure and electric braking devices are operated, resulting in a slower vehicle deceleration at the start of the braking process, leading to higher costs for high-performance hydraulic pressure braking device components.
Innovation Solution
A vehicle braking control device that differentially controls the supply of brake fluid to wheel cylinders for front and rear wheels, using both hydraulic pressure and electric braking mechanisms to increase the hydraulic pressure and braking force on one wheel while restricting fluid supply to the other, enhancing the initial deceleration speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If brake fluid is supplied to both front and rear wheel cylinders simultaneously during automatic braking, then the braking force is distributed evenly, but the increasing speed of vehicle deceleration is limited
Solution Approach 1:
The patent segments the braking control into two distinct phases: a first period where brake fluid is supplied to both front and rear wheel cylinders, and a second period where supply to the rear wheel cylinder is restricted while front wheel cylinder receives continued supply. This temporal segmentation allows the system to achieve rapid deceleration by concentrating hydraulic pressure buildup on the front wheels during the critical initial phase, without requiring complex additional hardware.
Solution Approach 2:
The braking control device dynamically adjusts the brake fluid supply strategy based on the braking state. The control unit transitions from a balanced supply mode (both wheels) to an asymmetric supply mode (front wheels only) during the automatic braking process. This dynamic adjustment optimizes the deceleration profile by maximizing the rate of braking force application when collision risk is highest, while maintaining system simplicity through software-based control.
2Speed
If high-performance parts are used in the hydraulic pressure braking device to increase deceleration speed, then the vehicle deceleration performance is improved, but the cost of the hydraulic pressure braking device increases
Solution Approach 1:
The patent changes the operational parameters of the existing hydraulic pressure braking device by implementing a time-varying brake fluid supply strategy. Instead of modifying hardware components, the system alters the control parameters (brake fluid supply timing and distribution) to achieve faster deceleration. The control unit restricts brake fluid supply to the rear wheel cylinder during the second period of automatic braking, thereby concentrating hydraulic pressure buildup on the front wheels and achieving rapid deceleration without requiring high-performance or expensive parts.
3Force
If both hydraulic pressure braking device and electric braking device are operated simultaneously, then the braking force is increased, but the displacement speed of the piston in the rear wheel braking mechanism is hardly changed
Solution Approach 1:
The patent applies preliminary action by supplying brake fluid to the front wheel cylinder during the first period before the electric braking device fully engages and before the nut pushes the piston in the rear wheel braking mechanism. This preliminary hydraulic pressure buildup on the front wheels creates immediate deceleration force. When the electric braking device subsequently engages and the nut pushes the rear wheel piston, the system is already in a high-deceleration state, maximizing the overall effect without causing conflict between the two braking mechanisms.
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 allows for a faster increase in braking force and vehicle deceleration at the start of the automatic braking process, improving the overall deceleration performance without the need for high-cost hydraulic pressure braking device upgrades.
Implementation Method 1
the brake fluid is supplied by the pump to both the wheel cylinder corresponding to the front wheel and the wheel cylinder corresponding to the rear wheel by the operation of the hydraulic pressure braking device... the piston is displaced by the increase in hydraulic pressure in the wheel cylinder
Implementation Method 2
the nut is displaced by the driving of the electric motor... the piston is pushed by the hydraulic pressure or the nut in the wheel cylinder... the friction material is pushed by the nut through the piston, and the friction material approaches and makes contact with the rotary body
Implementation Method 3
a friction material is thereby pushed against such a piston, and the friction material approaches and makes contact with a rotary body integrally rotating with the wheel... the force of pushing the friction material against the rotary body, that is, the braking force on the wheel increases
Data Source
AI summary
A vehicle braking control device is capable of further raising the speed at which vehicle vehicle-body deceleration increases when automatic braking processing implementation begins. Provided as a braking control device is a control device comprising: an acquisition unit that acquires an indicator; and a braking control unit that starts the implementation of automatic braking processing if a determination is made, on the basis of the indicator, that an automatic braking condition has been established. In the automatic braking process, the braking control unit restricts the supply of brake fluid to wheel cylinders corresponding to the rear wheels, and supplies brake fluid to wheel cylinders corresponding to the front wheels to increase the pressure of the wheel cylinders, thereby increasing the braking power for the front wheels and also giving the rear wheels braking power corresponding to the driving amount of a motor for parking.