Electromagnetic Valve Control Current Profile for Brake Noise Reduction
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Solution Overview
Problem
Conventional brake control devices fail to adequately reduce opening/closing operation noise in electromagnetic control valves due to deviations in differential pressure at the start of braking.
Innovation Solution
A vehicle control apparatus that applies a start current value smaller than the open/closed state change-over reference current to the electromagnetic control valve, gradually increasing the control current with a smaller inclination, and adjusting the change speed based on differential pressure changes, ensuring the valve state changes occur near the reference current value, thus minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the control current is increased rapidly to ensure quick valve response, then the control responsibility is improved, but the opening/closing operation noise increases
Solution Approach 1:
The control current is pre-set to a start current value that is smaller by a first predetermined amount than the open/closed state change-over reference current value before the valve switching action begins. This preliminary current setting prevents excessive current inclination at the moment of valve state change, thereby reducing hammering noise while maintaining adequate response speed.
Solution Approach 2:
The control current profile is made dynamic by adjusting the start current value based on the detected differential pressure. When differential pressure is high, the start current value is increased accordingly, allowing the valve to respond quickly under high pressure conditions without generating excessive noise. This dynamic adjustment optimizes both response speed and noise reduction across different operating conditions.
2Object-generated harmful factors
If the control current is reduced to minimize operation noise, then the opening/closing noise is reduced, but the control responsibility deteriorates
Solution Approach 1:
The control current parameters are changed based on the differential pressure conditions. The start current value is dynamically adjusted by adding a predetermined amount to the basic start current value when high differential pressure is detected. This parameter change ensures that the valve maintains sufficient response capability under high pressure while still benefiting from noise reduction under normal pressure conditions.
Solution Approach 2:
The control system transitions from a static current profile to a dynamic one that adapts to real-time differential pressure conditions. This dynamic control strategy ensures that the valve response remains reliable across varying pressure conditions while optimizing noise reduction performance.
3Device complexity
If a fixed control current profile is used, then the control system is simple, but the noise reduction is insufficient when differential pressure deviates
Solution Approach 1:
A feedback mechanism is introduced where the differential pressure is continuously detected and used to adjust the start current value. This feedback loop enables the control system to adapt to varying pressure conditions and maintain optimal noise reduction performance without requiring complex control algorithms, thus balancing simplicity and effectiveness.
Solution Approach 2:
The control current parameters are modified based on detected differential pressure conditions. By changing the start current value according to pressure levels, the system achieves effective noise reduction across different operating conditions while maintaining relatively simple control logic.
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 solution effectively reduces opening/closing operation noise without being influenced by differential pressure deviations, ensuring reliable state changes and minimizing hammering noise in the vehicle brake system.
Implementation Method 1
an electromagnetic control valve provided in a hydraulic pressure circuit for controlling a braking force to be applied to a vehicle
Data Source
AI summary
The vehicle control apparatus gives a control current to the electromagnetic control valve at a start of energization of the electromagnetic control valve as a start current value smaller by a first determined amount than an open/closed state change-over reference current value which is necessary for changing over a state of the electromagnetic valve and after the start of energization of the electromagnetic control valve, the control current gradually increases with a smaller increase inclination than an increase inclination of an increase control of the control current which gives priority to a control responsibility of the electromagnetic control valve and finishes a gradual increase of the control current applying to the electromagnetic control valve, when the control current exceeds a finish current value which is larger than the open/closed state change-over reference current value.