Pneumatic Vehicle Door Control Circuit for Impact Safety
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Solution Overview
Problem
Pneumatically actuated vehicle doors often result in significant impact when encountering obstacles, posing safety risks and requiring excessive effort to manually control the door post-impact, and existing solutions are not cost-effective or easily retrofittable.
Innovation Solution
A control circuit incorporating a solenoid-actuated three-way safety valve, pressure-operated switch, and microswitch, which balances pressure in a double-acting cylinder to stop the door upon impact and allow manual operation without significant effort, integrated with emergency valves for manual override, suitable for new and existing vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a pneumatically actuated door is used for vehicle access, then door automation and passenger convenience are improved, but significant impact occurs when a person or object lies in the trajectory, creating safety hazards
Solution Approach 1:
The control circuit incorporates sensors that detect the presence of persons or objects in the door trajectory and provide feedback signals to the control unit. This enables the automated door system to respond appropriately by stopping or reversing movement, thereby preventing impact while maintaining automation benefits
Solution Approach 2:
A control circuit acts as an intermediary between the automated door actuator and the door mechanism. This intermediary system processes sensor information and controls the pneumatic actuator to prevent harmful impacts, allowing automation to coexist with safety requirements
2Object-affected harmful factors
If the door is equipped with high holding force to prevent accidental opening, then safety is improved, but excessive effort is required to manually control the door after impact
Solution Approach 1:
The control circuit dynamically adjusts the holding force of the door based on operational context. During normal operation, high holding force prevents accidental opening. After detecting impact through sensors, the system automatically reduces holding force to enable easy manual operation, resolving the contradiction between safety and ease of operation
Solution Approach 2:
The system changes the pressure parameter in the pneumatic actuator based on operational state. High pressure provides strong holding force to prevent accidental opening, while low pressure after impact allows easy manual operation. The control circuit manages these parameter transitions automatically
3Reliability
If a complex control circuit with multiple valves is used to achieve safety and manual control, then safety and operational flexibility are improved, but device complexity and cost increase
Solution Approach 1:
The control circuit is designed to perform multiple functions using integrated components. The same control unit manages normal automated operation, impact detection, emergency stopping, and manual control assistance. This multi-functionality reduces the need for separate dedicated components for each function, lowering overall complexity while maintaining safety and flexibility
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 stops and manually controls vehicle doors after impact without excessive effort, ensuring safety and ease of operation, while being cost-effective and adaptable to various door systems, including retrofitting existing vehicles.
Implementation Method 1
double-acting cylinder with first and second chambers receiving pneumatic pressure
Implementation Method 2
pressure-operated switch, which enables control signal to the safety valve in response to pressure in the first line
Implementation Method 3
microswitch operable by the cylinder so as to disconnect the control signal just before the door reaches a fully open position
Data Source
AI summary
Control circuit for a pneumatically controlled vehicle door comprising a double-acting pneumatic cylinder (9) operable to open and close said door and having a first chamber (10) and a second chamber (11), a main pneumatic control block (5) having a first working port (7) and a second working port (8), a fist line (12) connected to the first chamber (10) of the cylinder (9) and constituting a release line in a given movement direction of the cylinder (9) corresponding to a first movement direction of the door, and a second line (13) connected to the second chamber (11) of the cylinder (9) and constituting a filling line in said movement direction; circuit (1) comprises a safety device (42) configured to connect the first line (12) to the first working port (7) in normal operation and to connect the first line (12) to the second line (13) in response to a control signal identifying that the door is blocked by an obstacle in said first direction of movement of the door.