Hydraulic Machine Desynchronized Coupling via Sequential Connection
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Solution Overview
Problem
Existing hydraulic transmission systems require engine shutdown and specific pressure control to transition from free wheel to working configuration, leading to potential damage and noisy coupling, especially when using non-dedicated pumps or accumulators.
Innovation Solution
A hydraulic circuit with sequential connection means, including a high pressure line, low pressure line, and a control line, utilizing a selector valve and distributors to progressively connect the hydraulic machine's ports to these lines, allowing gradual piston emergence and reducing wear and noise without dedicated pressure supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hydraulic machine is engaged during rotation using conventional methods, then the transmission can be activated, but the pistons and cam suffer degradation and damage
Solution Approach 1:
The patent applies preliminary action by pressurizing the housing before the pistons reach the cam peaks. The control method delays the high-pressure supply until a predetermined time before the pistons contact the cam, allowing gradual piston emergence and avoiding impact degradation. This timing control is the core preliminary action that prevents damage while enabling engagement during rotation.
2Reliability
If engine shutdown is required for hydraulic transmission activation, then piston-cam degradation is avoided, but vehicle operation becomes constrained and less efficient
Solution Approach 1:
The patent eliminates the need for engine shutdown by applying preliminary pressurization control. The housing is pressurized in advance before piston-cam contact, allowing safe engagement during rotation. This resolves the contradiction by enabling continuous operation while protecting components through timing-controlled pressure application.
Solution Approach 2:
The patent changes the pressure parameter timing and distribution. Instead of immediate full-pressure supply, the system uses delayed and controlled pressure application to the housing, with distinct timing for intake and discharge ports. This parameter control enables safe engagement during rotation without engine shutdown.
3Speed
If immediate pressure supply is applied to engage the hydraulic machine, then coupling is achieved quickly, but noisy coupling and impact occur
Solution Approach 1:
The patent uses preliminary action by pressurizing the housing before piston-cam contact. The control method supplies high pressure to the housing a predetermined time before the pistons reach the cam peaks, enabling gradual piston emergence. This eliminates impact and noise while maintaining quick coupling, as the pressure is already prepared but applied at the optimal moment.
4Reliability
If dedicated pumps with precise pressure control are used, then controlled coupling is achieved, but system complexity and cost increase
Solution Approach 1:
The patent applies self-service by using the vehicle's existing hydraulic pump and pressure control system. No dedicated pump is required; the existing system's pressure fluctuations are utilized through intelligent timing control. The ECU manages the engagement timing based on sensor inputs, allowing the existing hardware to serve the new function, thereby reducing complexity while maintaining control precision.
Solution Approach 2:
The patent changes the control parameter from dedicated hardware to software-based timing control. The ECU manages the engagement timing by controlling when the existing pump connects to the hydraulic machine, based on rotational speed and position sensors. This parameter change from hardware to software control reduces system complexity while maintaining precise control.
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
Enables progressive and silent coupling of hydraulic machines, reducing wear on pistons and cams, and functioning with non-dedicated pumps or accumulators, without the need for engine shutdown or precise pressure control.
Implementation Method 1
a pump (1) capable of supplying pressurized hydraulic fluid under particular conditions of the vehicle's use
Implementation Method 2
sequential connection means, designed to sequentially connect said ports of the hydraulic machine to said high and low pressure lines
Data Source
AI summary
A hydraulic circuit. The circuit includes a high pressure line and a low pressure line, the pressure in the high pressure line being greater than the pressure in the low pressure line, a hydraulic machine having two ports designed to be connected to the high pressure and low pressure lines, a first of the ports being a hydraulic fluid intake port and the second of the ports being a hydraulic fluid discharge port The circuit includes a sequential connector designed to connect the ports of the hydraulic machine to the high and low pressure lines.