Solenoid Valve Control Adjusting Drive Frequency for Vibration and Hysteresis
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Solution Overview
Problem
Proportional solenoid valves in automatic transmission control systems face a trade-off between oil-vibration and hysteresis, with increased PWM signal frequency reducing vibration but increasing hysteresis, and environmental conditions affect permissible ranges, making simultaneous reduction of both challenging.
Innovation Solution
A solenoid valve control system that includes a drive circuit, pressure data and hysteresis calculation units, and a drive frequency adjustment mechanism to determine and adjust the drive frequency based on pressure data and hysteresis amounts, ensuring both are within predetermined ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the PWM signal frequency is increased, then oil-vibration is reduced, but hysteresis is increased
Solution Approach 1:
The patent applies dynamics by making the PWM signal frequency variable rather than fixed. The control device dynamically adjusts the frequency based on real-time detection of oil-vibration and hysteresis levels, allowing the system to adapt to changing operating conditions and optimize both vibration suppression and hysteresis minimization simultaneously
Solution Approach 2:
The patent implements feedback control by detecting actual oil-vibration and hysteresis values during operation, comparing them against target ranges, and using this information to adjust the PWM frequency. This closed-loop feedback mechanism enables the system to resolve the trade-off between vibration reduction and hysteresis control
2Ease of operation
If a common permissible range is used for oil-vibration and hysteresis, then control is simplified, but performance degrades under varying environmental conditions
Solution Approach 1:
The patent makes the permissible ranges dynamic by adjusting them according to environmental conditions such as vehicle type and engine speed. Rather than using fixed thresholds, the system adapts its target ranges for oil-vibration and hysteresis based on operating context, maintaining high performance across diverse conditions
Solution Approach 2:
The patent changes the parameters of permissible ranges based on environmental conditions. By modifying the acceptable thresholds for oil-vibration and hysteresis according to vehicle type, engine speed, and other contextual factors, the system optimizes control performance for each specific operating scenario
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
The system effectively suppresses oil vibration and hysteresis within permissible ranges, adapting to environmental conditions such as vehicle type and engine speed, improving control valve performance.
Implementation Method 1
The proportional solenoid valve moves a plunger in accordance with a drive current supplied to the solenoid
Data Source
AI summary
A solenoid valve control system comprising a solenoid valve drive circuit applying a drive current to the solenoid valve; a pressure data calculation unit calculating a pressure data including a band and a cycle of pressure fluctuation from a pressure value; a pressure hysteresis calculation unit calculating a difference between the pressure value when the drive current value is increased and the pressure value when the drive current value is decrease as a hysteresis amount; a vibration determination unit determining whether or not the pressure data is included in an area outside the pressure data range, which is outside a first predetermined range; a hysteresis determination unit determining whether or not the pressure hysteresis amount is included in an area outside the pressure hysteresis amount range, which is outside a second predetermined range; and a drive frequency adjustment unit adjusting a drive frequency based on the determination result.