Hydraulic Rear-Wheel Steering Sync With Closed-Loop Oil Flow Control
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Solution Overview
Problem
Traditional low-speed heavy-load vehicles face issues with steering accuracy and reliability due to manufacturing errors, wear, and shared oil pump interference, leading to poor driver direction feeling, increased driving difficulty, and reduced safety.
Innovation Solution
A full hydraulic synchronous steering system with a steering control mechanism and actuator, including sensors, solenoid valves, and a hydraulic steering pump, that adjusts oil flow to synchronize steering wheel and rear wheel angles, ensuring consistent direction and prioritizing steering circuit pressure and flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional hydraulic steering pump is used, then the steering system is simple in structure, but the steering accuracy deteriorates due to manufacturing errors, mounting errors, and wear
Solution Approach 1:
The patent implements a feedback control system where the actual steering angle is continuously detected by a steering angle sensor and compared with the target steering angle. The controller adjusts the hydraulic steering pump's oil discharge based on the angle difference, creating a closed-loop system that automatically compensates for manufacturing errors, mounting errors, and wear, thereby maintaining high steering accuracy without increasing structural complexity significantly
Solution Approach 2:
The patent replaces traditional mechanical steering linkages with a hydraulic steering system controlled by electronic components. The hydraulic steering pump is controlled by a controller that receives signals from sensors and adjusts oil discharge accordingly, substituting mechanical error transmission with electronically controlled hydraulic actuation, which allows for precise steering angle control
2Device complexity
If a shared oil pump is used for steering and other hydraulic systems, then the overall system structure is simplified, but the working capacity and reliability of the steering system deteriorates due to working interferences
Solution Approach 1:
The patent segments the hydraulic system by providing a dedicated hydraulic steering pump separate from other hydraulic systems. This segmentation ensures that the steering system has its own independent oil supply, eliminating working interferences with other hydraulic components such as the cargo lift system, and guaranteeing reliable steering performance under all operating conditions
Solution Approach 2:
The patent implements preliminary action by equipping the vehicle with a dedicated hydraulic steering pump from the outset, rather than attempting to share the oil pump. This preliminary design decision prevents potential steering reliability issues before they can occur, ensuring that steering oil supply is never compromised by other hydraulic operations
3Device complexity
If manual steering correction is required to maintain direction, then the steering system structure remains simple, but the driver's labor intensity and driving difficulty increase
Solution Approach 1:
The patent employs feedback control where the steering angle sensor continuously monitors the actual steering angle and feeds this information back to the controller. The controller automatically adjusts the hydraulic steering pump's oil discharge to maintain the desired steering angle, eliminating the need for manual steering correction and significantly reducing driver labor intensity and driving difficulty
Solution Approach 2:
The steering system performs self-correction automatically through the feedback control mechanism. The system monitors its own steering angle and makes necessary adjustments without driver intervention, making the steering system service itself and eliminating the need for continuous manual correction, thereby greatly improving ease of operation
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 automatically corrects steering direction, reduces driver effort, enhances safety and direction feeling, and allows for flexible steering ratios, improving operational efficiency and reliability by maintaining steering circuit pressure and flow.
Implementation Method 1
a hydraulic steering pump 8 and an oil discharge throttle valve 13; the steering wheel angle sensor is disposed on a drive shaft of the steering wheel, and the steering wheel angle sensor rotates with the steering wheel and is configured to collect a steering wheel angle signal
Implementation Method 2
a load-sensitive solenoid valve, an oil discharge solenoid valve, an oil replenishment solenoid valve
Data Source
AI summary
The present application provides a full hydraulic synchronous steering system for a low-speed heavy-load vehicle, where the system includes: a steering control mechanism and a steering actuator; by determining a desired steering curve between a steering wheel angle and a rear wheel angle, when a steering error exceeds an allowable error, a controller controls the opening and closing of an oil replenishment solenoid valve (5) and an oil discharge solenoid valve (4) to adjust an flow rate of the oil flowing into a steering cylinder (7), so as to ensure that the steering error is within an allowable error range, thereby implementing synchronous steering. A method for manipulating the full hydraulic synchronous steering system is further provided. The full hydraulic synchronous steering system and the method can improve synchronous steering capability of the low-speed heavy-load vehicle and change a steering ratio, thereby improving safety and direction feeling of a driver.