Vehicle Brake Device Dynamic Dead Zone Control
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Solution Overview
Problem
The vehicle brake device with an actuator experiences pulsation in master pressure, leading to excessive operation of the driving portion due to short pulsation periods, which can reduce the durability of components.
Innovation Solution
The vehicle brake device includes a hydraulic pressure generating portion with a driving portion that drives a master piston, an actuator, and a controlling portion that maintains driving force by setting a wide dead zone based on rigidity information of the control subject chamber, reducing excessive operations of the driving portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the actuator operates frequently to adjust master pressure, then the pressure control precision is improved, but the driving portion experiences excessive operations leading to reduced durability
Solution Approach 1:
The dead zone width is dynamically adjusted based on rigidity information of the control subject chamber. When rigidity is high, the dead zone is widened to suppress excessive driving portion operations. This parameter change allows the system to tolerate larger pressure fluctuations without triggering unnecessary corrections, thereby reducing operational frequency while maintaining adequate pressure control.
Solution Approach 2:
The dead zone is not fixed but dynamically adapted based on real-time rigidity information. The controlling portion modifies the dead zone width according to the current state of the control subject chamber, making the system responsive to changing conditions. This dynamic adjustment prevents excessive operations during high-rigidity states while maintaining precision when rigidity is low.
2Reliability
If the dead zone is widened to suppress excessive operations, then the durability of components is improved, but the pressure control precision may deteriorate
Solution Approach 1:
The dead zone width is dynamically adjusted based on rigidity information of the control subject chamber. When rigidity is high, the dead zone is widened to suppress excessive driving portion operations. This parameter change allows the system to tolerate larger pressure fluctuations without triggering unnecessary corrections, thereby reducing operational frequency while maintaining adequate pressure control.
Solution Approach 2:
The dead zone is not fixed but dynamically adapted based on real-time rigidity information. The controlling portion modifies the dead zone width according to the current state of the control subject chamber, making the system responsive to changing conditions. This dynamic adjustment prevents excessive operations during high-rigidity states while maintaining precision when rigidity is low.
3Speed
If the rigidity of the control subject chamber is high, then the master pressure responds faster to actuator adjustments, but the pressure pulsation becomes more pronounced causing excessive driving portion operations
Solution Approach 1:
The dead zone width is dynamically adjusted based on rigidity information of the control subject chamber. When rigidity is high, the dead zone is widened to suppress excessive driving portion operations. This parameter change allows the system to tolerate larger pressure fluctuations without triggering unnecessary corrections, thereby reducing operational frequency while maintaining adequate pressure control.
Data Source
AI summary
A vehicle brake device provided with a hydraulic pressure generating portion, an actuator and a controlling portion which maintains a driving force of the driving portion when a control subject pressure in a control subject chamber is within a dead zone, wherein the control subject pressure varies in response to a variation of the master pressure and a pulsation is generated in the master pressure accompanying an operation of the actuator. The vehicle brake device further includes a rigidity information obtaining portion which obtains a rigidity information and a dead zone setting portion which sets the dead zone based on the rigidity information obtained by the rigidity information obtaining portion such that the higher the rigidity of the control subject chamber, or the higher the probability of rigidity increase of the control subject chamber, the wider the dead zone is set.