Hydraulic Boost System Torque Balance via Bypass Modulation
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Solution Overview
Problem
Hydraulic assistance systems for vehicles face issues with overpressure and torque imbalance during turns, as the fixed displacement of driving and driven hydraulic devices leads to excessive torque transmission and rapid oil pressure increase, which can cause damage and affect vehicle stability.
Innovation Solution
Incorporating a bypass system with pressure and flow limiters that automatically modulate the rotational speed ratio between the driving and driven hydraulic devices, allowing for leakage between the supply and return lines to regulate torque and pressure, and using solenoid valves for selective control to manage behavior based on driving conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed displacement hydraulic devices are used to transmit torque between axles, then torque transmission is effective for preventing wheel slip, but overpressure occurs during turns causing vehicle instability and potential damage
Solution Approach 1:
The patent applies variable displacement hydraulic devices instead of fixed displacement devices, allowing the displacement to be dynamically adjusted based on operating conditions. This enables the system to adapt torque transmission to actual needs while preventing overpressure during turns, resolving the contradiction between reliable torque transmission and overpressure prevention.
Solution Approach 2:
The patent changes the displacement parameter of the hydraulic devices from fixed to variable, and introduces pressure-regulating valves to control oil pressure parameters. This allows the system to maintain effective torque transmission while preventing harmful overpressure conditions during vehicle turns.
2Device complexity
If the same displacement is used for both driving and driven hydraulic devices, then the system structure is simplified, but the gear ratio cannot be modified to adapt to different driving conditions
Solution Approach 1:
The patent uses variable displacement hydraulic devices that can dynamically adjust their displacement ratios, enabling the gear ratio to be modified according to different driving conditions such as turns or acceleration, while maintaining a relatively simple system structure through electronic control.
Solution Approach 2:
The patent creates a universal hydraulic transmission system that can perform multiple functions: torque transmission for wheel slip prevention, variable gear ratio adjustment for different driving conditions, and overpressure prevention. This multi-functionality resolves the contradiction between structural simplicity and adaptability.
3Reliability
If hydraulic assistance is activated to prevent wheel slip, then traction is improved, but torque imbalance during turns affects vehicle stability
Solution Approach 1:
The patent implements dynamic control of hydraulic device displacement and oil pressure based on real-time detection of vehicle operating conditions. During turns, the system automatically adjusts parameters to prevent torque imbalance, maintaining both traction reliability and vehicle stability simultaneously.
Solution Approach 2:
The patent incorporates feedback control through sensors that detect wheel slip conditions and vehicle state, with the control unit adjusting hydraulic device parameters accordingly. This feedback mechanism ensures that torque transmission improves traction while preventing instability during turns.
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
This solution effectively prevents overfeeding and pressure surges, ensuring stable operation by allowing controlled torque distribution between axles, enhancing vehicle stability and control, particularly during turns and cornering, while maintaining normal operation under standard conditions.
Implementation Method 1
the driving hydraulic device is driven by the driving axle and therefore functions as a hydraulic pump, to deliver a flow which supplies the driven hydraulic device which then functions as a hydraulic motor
Implementation Method 2
Incorporating a bypass system with pressure and flow limiters that automatically modulate the rotational speed ratio between the driving and driven hydraulic devices
Implementation Method 3
using solenoid valves for selective control to manage behavior based on driving conditions
Data Source
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AI summary
The invention relates to a system (100) comprising: a hydraulic drive apparatus (1) having an inlet (11) and an outlet (12), where said hydraulic drive apparatus (1) is of the fixed-displacement type, a driven hydraulic apparatus (2) having an inlet (21) and an outlet (22), where the outlet of said hydraulic drive apparatus is connected to the inlet of the driven hydraulic apparatus by a supply line (4), and the outlet of the driven hydraulic apparatus is connected to the inlet of the hydraulic drive apparatus by a return line (5), where the driven hydraulic apparatus (2) is of the fixed-displacement type, and a bypass (6) connected to both the supply line (4) and the return line (5), where said bypass comprises at least one means (61) configured to automatically transfer the flow rate between the supply line (4) and the return line (5) in order to adjust a speed ratio between the hydraulic drive apparatus and the driven hydraulic apparatus.