Industrial Vehicle Braking System Engine Stall Prevention
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Solution Overview
Problem
Existing braking systems for industrial vehicles face the risk of engine stall when switching oil channels due to high hydraulic oil pressure, causing sudden extreme loads that can be intolerable to the engine.
Innovation Solution
A braking system with a switch valve that allows hydraulic oil to be directed from a hydraulic pump to an accumulator without going to a hydraulic oil cooler, and a controlling section that increases engine speed when the switch valve changes channels and the engine is at idle, detected by pressure and idle sensors to manage the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch valve switches from the second oil channel to the first oil channel, then the hydraulic oil is supplied from the hydraulic pump to the accumulator, but the high hydraulic oil pressure applies sudden extreme load to the engine causing engine stall
Solution Approach 1:
The controlling section increases the engine speed before the switch valve switches from the second oil channel to the first oil channel. This preliminary action of increasing engine speed ensures that the engine has sufficient power reserve to handle the sudden extreme load when high hydraulic oil pressure is applied to the accumulator, thereby preventing engine stall.
2Reliability
If the engine speed is increased to prevent engine stall, then the engine can handle the sudden load, but fuel consumption increases
Solution Approach 1:
The controlling section increases the engine speed only temporarily and periodically - specifically during the brief moment when the switch valve transitions from the second oil channel to the first oil channel. After the switching is complete, the engine speed is returned to normal. This periodic action minimizes fuel consumption while still providing the necessary power boost to prevent engine stall during the critical switching moment.
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
Prevents engine stall by managing the load during channel switching, allowing for safe operation while minimizing adverse effects on fuel consumption and reducing the risk of engine failure.
Implementation Method 1
a hydraulic pump driven by the engine and discharging hydraulic oil
Implementation Method 2
an accumulator accumulating the hydraulic oil discharged from the hydraulic pump
Implementation Method 3
a hydraulic oil cooler cooling the hydraulic oil discharged from the hydraulic pump
Implementation Method 4
a brake apparatus driven by hydraulic oil
Data Source
AI summary
A brake system includes an accumulator accumulating hydraulic oil discharged from a hydraulic pump, a hydraulic oil cooler cooling the hydraulic oil discharged from the hydraulic pump, a switch valve switching between a first oil channel that allows supplying the hydraulic oil from the hydraulic pump to the accumulator but not to the hydraulic oil cooler, and a second oil channel that allows supplying the hydraulic oil from the hydraulic pump to the hydraulic oil cooler, and a controller controlling an engine to increase an engine speed of the engine when a first detector detects timing to switch the switch valve from the second oil channel to the first oil channel and a second detector detects that the engine is running at idle.