Variable Nozzle Turbocharger Control for Shovel Engine Response
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Solution Overview
Problem
Conventional shovels equipped with turbochargers face challenges in quickly responding to increased engine loads, particularly at low atmospheric pressures, leading to reduced engine output and potential engine stoppages due to insufficient supercharging pressure.
Innovation Solution
A shovel system with a controller that proactively increases the supercharging pressure by adjusting the nozzle opening degree of the variable nozzle turbo before a hydraulic load is applied, maintaining engine revolution speed and preventing engine stoppages, even in low-altitude environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a turbocharger is used to increase engine power through supercharging, then engine output is improved, but the response speed to increased engine load is insufficient particularly at low atmospheric pressures
Solution Approach 1:
The control device performs preliminary action by increasing the supercharging pressure in advance when an operation increasing engine load is detected, before the actual load increase occurs. This proactive approach ensures the turbocharger is already at optimal pressure when the load increase happens, eliminating the delay typically experienced at low atmospheric pressures and maintaining fast response speed while preserving engine output.
2Power
If conventional output control increases supercharging pressure after detecting increased engine load, then engine power is maintained, but response delay occurs leading to potential engine stoppages
Solution Approach 1:
The control device detects operations that will increase engine load and proactively increases supercharging pressure before the load increase occurs. This preliminary action prevents the response delay that would otherwise cause engine stoppages, ensuring both engine power maintenance and operational reliability without interruption.
Solution Approach 2:
The control device applies preliminary anti-action by counteracting the potential negative effect (engine stoppage due to response delay) before it can occur. By preemptively increasing supercharging pressure, the system neutralizes the risk of engine stoppages that would result from conventional reactive control, especially under low atmospheric pressure conditions.
3Stability of the object's composition
If the engine maintains fixed revolution speed, then operational stability is improved, but the ability to quickly respond to hydraulic load increases is reduced
Solution Approach 1:
The control device performs preliminary action by increasing supercharging pressure in advance when load-increasing operations are detected. This allows the engine to maintain fixed revolution speed for stability while the supercharging pressure is proactively adjusted, ensuring rapid response capability is preserved without compromising operational stability.
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 consistent engine output and prevents engine stoppages by increasing supercharging pressure before hydraulic loads are applied, maintaining efficient operation across varying atmospheric conditions.
Implementation Method 1
The turbocharger can increase an engine's power by performing supercharge by introducing a pressure, which is generated by rotating a turbine using an exhaust gas of the engine
Implementation Method 2
rotating a turbine using an exhaust gas of the engine
Implementation Method 3
the controller performs a process of increasing the rotating speed of the supercharger so as to increase a supercharging pressure generated by the supercharger
Data Source
AI summary
A shovel includes a boom cylinder that drives a boom and an arm cylinder that drives an arm. A hydraulic pump supplies operating oil to the boom cylinder and the arm cylinder. An engine is connected to the hydraulic pump and equipped with a supercharger. The engine is controlled to maintain a revolution speed within a certain definite range. A controller controls a rotating speed of the supercharger. The controller performs a process of increasing the rotating speed of the supercharger so as to increase a supercharging pressure generated by the supercharger before a hydraulic load is applied to the engine.