Brake Device Dynamic Dead Zone Pressure Control
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Solution Overview
Problem
Conventional brake devices experience a deviation in controlling responsiveness due to the dead zone setting, leading to a drop in braking force controllability and pressure differences between actual and target pressures.
Innovation Solution
The brake device includes a pressure adjusting mechanism that judges whether the actual pressure is within the dead zone range and adjusts the target pressure to minimize differences with the actual pressure, preventing delays and variations by executing adjustments only under specific conditions such as constant pressure, stable control states, and predetermined threshold changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dead zone is preset for the target pressure to suppress hunting of hydraulic pressure control, then the stability of pressure control is improved, but the controllability of braking force drops due to deviation between actual pressure and target pressure
Solution Approach 1:
The dead zone width is made dynamically adjustable rather than fixed. The control unit changes the dead zone width based on the absolute value of the difference between actual pressure and target pressure. When the pressure difference is large, a wider dead zone suppresses hunting; when the pressure difference is small, a narrower dead zone improves controllability and reduces deviation.
Solution Approach 2:
The control parameters (dead zone width) are changed based on the system state (pressure difference). By adjusting the dead zone width according to the absolute value of the pressure difference, the system optimizes both stability and controllability under different operating conditions.
2Stability of the object's composition
If the regulator is not controlled when actual pressure is within the dead zone range, then hunting of hydraulic pressure control is suppressed, but delay occurs in actual pressure change relative to target pressure change
Solution Approach 1:
The dead zone width is dynamically adjusted based on the pressure difference magnitude. When pressure difference is large, the wider dead zone suppresses hunting; when pressure difference is small, the narrower dead zone reduces response delay, allowing the system to balance stability and responsiveness based on real-time conditions.
Solution Approach 2:
The control unit preliminarily adjusts the dead zone width before pressure control actions based on the current pressure difference. This preliminary adjustment ensures that the appropriate dead zone width is in place to either suppress hunting or minimize delay depending on the system state.
Data Source
AI summary
A brake device for controlling an actual pressure of an output hydraulic pressure outputted from a pressure adjusting device and applying a braking force to a wheel of a vehicle based on the actual pressure of the output hydraulic pressure. The brake device includes an actual pressure judging portion configured to judge whether or not the actual pressure of the output hydraulic pressure is the pressure that is within the range of the dead zone and a adjusting portion configured to execute a target pressure adjustment for adjusting a target pressure of the output hydraulic pressure to approximate a side of the actual pressure of the output hydraulic pressure.