Four-Wheel Steering Valve Control for Independent Rear Steering
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Solution Overview
Problem
Existing vehicles with four-wheel steering systems lack independent steering control for rear wheels, leading to poor driving flexibility and safety issues in complex environments.
Innovation Solution
A four-wheel steering control system with independent steering control for front and rear wheels, utilizing a combination of reversing valves and a switch valve, along with detection members and an electronic control unit to ensure accurate wheel positioning and automatic centering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional four-wheel steering system is used where rear wheels cannot steer independently, then the system structure is simpler, but driving flexibility and maneuverability are poor
Solution Approach 1:
The steering control system is divided into independent front wheel steering control and rear wheel steering control subsystems. Each subsystem has its own reversing valve (first reversing valve for front wheels, second reversing valve for rear wheels) that can independently control the steering of respective wheels, enabling flexible four-wheel steering, front-wheel steering, and rear-wheel steering modes
Solution Approach 2:
The system dynamically switches between different steering modes (four-wheel steering, front-wheel steering, rear-wheel steering) based on driving conditions. The reversing valves can be controlled to different positions to change the hydraulic connection paths, allowing the steering system to adapt to different operational requirements in real-time
2Adaptability or versatility
If independent rear wheel steering control is added to enable four-wheel steering mode, then driving flexibility improves, but the hydraulic system complexity and number of valves increase
Solution Approach 1:
The first reversing valve serves multiple functions: it controls front wheel steering independently and also controls rear wheel steering when combined with the second reversing valve. The second reversing valve similarly controls rear wheel steering independently and works with the first reversing valve for four-wheel steering mode, reducing the need for separate dedicated valves for each function
Solution Approach 2:
The switch valve acts as an intermediary that controls the hydraulic connection between the second reversing valve and the oil tank. By switching the connection state of the switch valve, the system can enable or disable rear wheel steering functionality, providing a simple on/off control mechanism for the complex rear steering subsystem
3Reliability
If manual steering control is used without automatic centering, then the control system is simpler, but safety is reduced due to inability to prevent accidents in complex environments
Solution Approach 1:
The system incorporates detection members that detect the steering states of front and rear wheels and provide feedback signals to the control unit. The control unit processes these signals and automatically controls the reversing valves to center the wheels when necessary, creating a closed-loop control system that enhances safety without requiring complex additional hardware
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
Enhances driving flexibility and safety by enabling independent steering control of rear wheels, improving maneuverability and preventing accidents through automatic wheel centering.
Implementation Method 1
a hydraulic system... a first reversing valve, a second reversing valve and a switch valve are connected in sequence in the hydraulic system
Data Source
AI summary
A The four-wheel steering control system includes a front drive axle, a front drive cylinder, a rear drive axle, a rear drive cylinder, a first reversing valve, a second reversing valve, and a switch valve. The front drive cylinder is drivingly connected to the front drive axle, and the rear drive cylinder is drivingly connected to the rear drive axle. A first working oil port of the first reversing valve communicates with one oil chamber of the front drive cylinder. A second working oil port of the first reversing valve communicates with an oil inlet of the second reversing valve. An oil return port of the second reversing valve communicates with another oil chamber of the front drive cylinder. Two working oil ports of the second reversing valve communicate with two oil chambers of the rear drive cylinder one to one.