Hydraulic Pressure Control Device Idle Area Correction
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Solution Overview
Problem
Hydraulic pressure control devices face challenges in correcting control currents due to an idle area where pressure increasing control has no influence on actual pressure, leading to delayed reactions that exceed permissible time thresholds.
Innovation Solution
The hydraulic pressure control device includes a judging portion to identify when pressure increasing control is executed in an idle area, and adjusts the control current correction using an idle threshold time different from normal thresholds, allowing for appropriate correction of control currents based on the specific area's reaction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure increasing control is executed from an initial state, then the actual pressure remains unaffected during the idle area, but the reaction time exceeds the permissible threshold time
Solution Approach 1:
The judging portion identifies when the system is in the idle area before correction is applied. By detecting the idle area condition in advance, the system can prepare appropriate correction values ahead of time, allowing the correction to be applied as soon as the pressure responds, thereby minimizing the overall reaction time delay.
Solution Approach 2:
The correcting portion applies different correction values to the control current depending on whether the system is in the idle area or not. By changing the control current parameter dynamically based on the judged state, the system compensates for the idle area delay and achieves faster effective pressure response.
2Device complexity
If a single threshold time is used for correction, then the correction logic is simple, but it cannot properly account for the idle area where pressure does not react
Solution Approach 1:
The control system is segmented into different operational states: idle area and non-idle area. The judging portion divides the operation into these distinct states, and the correcting portion applies different correction strategies for each state. This segmentation allows for more precise reaction time measurement and correction in each specific operational context.
Solution Approach 2:
Different correction values and threshold times are applied locally depending on the specific operational state. In the idle area, a different threshold time is used compared to non-idle areas, allowing the system to account for the unique characteristics of each operational region and achieve more accurate overall control.
Data Source
AI summary
The hydraulic pressure control device has an idle region, and is provided with a control portion, and a correcting portion which, in cases when the reaction time of the actual pressure to pressure increasing control or pressure decreasing control exceeds a predetermined threshold time, corrects a control current towards the side in which the flow-rate is increased. In cases when a judging portion has judged that the pressure increasing control is in the idle area, the correcting portion applies, as the threshold time, an idle threshold time set to a value different from the threshold time that in cases when the judging portion has not judged that the pressure increasing control is in the idle area. Furthermore, in cases when the reaction time of the actual pressure to the pressure increasing control exceeds the idle threshold time, the correcting portion corrects the control current.