Vehicular Braking Device Pressure Control Switching
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Solution Overview
Problem
Existing vehicular braking devices face challenges in achieving both improved responsiveness and suppression of excess response, particularly due to response delays in output pressure changes during initial pressure increasing or decreasing operations.
Innovation Solution
A vehicular braking device incorporating a hydraulic pressure generating device with a first control portion for excess response suppression and a second control portion for responsiveness priority, which cancels response delays by adjusting input pressure speeds, along with a switching portion to switch between these controls based on braking target hydraulic pressure states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the hydraulic pressure generating device operates to increase output pressure, then the braking control responsiveness is improved, but a response delay occurs at the initial stage of pressure increasing operation
Solution Approach 1:
The system performs preliminary action by detecting when the output pressure is low (initial stage) and proactively increasing the input pressure at a higher rate before the response delay can significantly impact performance. The switching portion identifies the initial stage condition and activates the responsiveness priority control to preemptively compensate for the anticipated response delay.
Solution Approach 2:
The system dynamically adjusts the input pressure increasing rate based on the operating conditions. The second control portion increases the input pressure at a higher rate during initial stages, while the switching portion dynamically transitions between excess response suppression control and responsiveness priority control based on real-time pressure conditions, making the system adaptive to different operational phases.
2Speed
If the input pressure increasing rate is increased to improve responsiveness, then the response delay is reduced, but excess response occurs in the output pressure
Solution Approach 1:
The switching portion dynamically selects between two control modes based on real-time pressure conditions. When the output pressure is low, responsiveness priority control applies higher input pressure rates. When the output pressure approaches the target, excess response suppression control takes over to prevent overshooting, creating a dynamic adaptation to different phases of pressure change.
Solution Approach 2:
The system applies partial excessive action by temporarily using a higher input pressure increasing rate than normally required during the initial stage to compensate for response delay. This excessive action is deliberately limited to specific conditions (when output pressure is low) and is subsequently reduced by the switching portion to prevent excess response, allowing the system to benefit from accelerated response when needed while avoiding overshoot when approaching the target.
3Device complexity
If a single control mode is used for pressure control, then the control system is simple, but both responsiveness improvement and excess response suppression cannot be achieved simultaneously
Solution Approach 1:
The patent merges two control modes (excess response suppression control and responsiveness priority control) into a unified system. The switching portion integrates these controls by selecting the appropriate mode based on pressure conditions, combining the benefits of both approaches while maintaining a relatively simple overall structure through conditional logic rather than separate independent systems.
Data Source
AI summary
A hydraulic pressure braking force generation device is provided with a first control unit for performing control for inhibiting excessive responses in which the input pressure is controlled such that the output pressure is within a first region set using a braking target oil pressure as a reference, a second control unit for performing control for responsiveness in which the increase speed or decrease speed of the input pressure is increased so as to be larger than that in the control for inhibiting excessive responses, to cancel response delay and a switching unit which, on the basis of the state of the braking target oil pressure, switches between the control for inhibiting excessive responses performed by the first control unit and the control for responsiveness performed by the second control unit.