Variable Displacement Pump for Dual Clutch Hydraulic Actuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automated manual transmissions in commercial vehicles experience interruptions in traction during shifting, leading to reduced driving speed and increased energy consumption, especially when driving uphill, due to inefficient torque delivery from engines which are only effective in a narrow speed range.
Innovation Solution
A hydraulic system utilizing a variable displacement pump driven by an internal combustion engine, which adjusts hydraulic fluid delivery volume based on engine speed and demand, eliminating the need for additional electric motors and reducing energy losses by minimizing excessive fluid delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a constant displacement pump is used to supply hydraulic fluid, then the pump structure is simple, but the energy efficiency deteriorates due to excessive fluid delivery at high engine speeds
Solution Approach 1:
The patent applies the dynamics principle by using a variable displacement pump instead of a constant displacement pump. The pump's delivery volume is made dynamically adjustable through a control device that modifies the pump's operating parameters based on real-time conditions. This allows the system to optimize energy efficiency by delivering only the required hydraulic fluid volume at each engine speed, preventing energy waste from excessive fluid delivery while maintaining a relatively simple pump structure through controlled parameter variation.
2Reliability
If hydraulic fluid is continuously supplied to clutches, then traction interruption is minimized, but energy consumption increases due to unnecessary fluid delivery
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the hydraulic pump's delivery volume based on actual system needs. The control device monitors engine speed and operational requirements, then modifies the pump's delivery parameters accordingly. This ensures that hydraulic fluid is supplied at the minimum necessary rate to maintain clutch operation and traction continuity, eliminating energy waste from excessive fluid delivery while preserving reliable traction throughout the operating range.
3Ease of operation
If the pump delivers high flow rate at all engine speeds, then clutch actuation is ensured, but energy efficiency deteriorates at low demand conditions
Solution Approach 1:
The patent applies partial action by delivering hydraulic fluid at varying rates matched to actual demand rather than continuously at maximum capacity. The control device determines the minimum necessary flow rate required for proper clutch actuation at each engine speed and delivers only that amount. This prevents the energy waste associated with delivering excessive fluid at low demand conditions while ensuring sufficient flow rate is always provided to maintain reliable clutch 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 ensures continuous tractive force without interruptions, enhancing energy efficiency and reducing fuel consumption by optimizing hydraulic fluid delivery to match the vehicle's operational needs, particularly suitable for commercial vehicles.
Implementation Method 1
a pump (10) for supplying hydraulic fluid to the at least one coupling (2.1, 2.2)
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to a hydraulic arrangement for actuating or cooling at least one clutch of a dual clutch of a vehicle, having a pump for providing a hydraulic fluid for actuating or cooling the at least one clutch; and having an internal combustion engine, which is designed to drive the pump; and having a clutch pressure branch for providing the hydraulic fluid for actuation; and having a cooling branch for providing the hydraulic fluid for cooling; wherein the pump is configured as a variable displacement pump having a variable displacement volume. The invention further relates to a method for actuating or cooling at least one clutch of a dual clutch by means of the hydraulic arrangement.