Industrial Vehicle Engine Speed Control for Smooth Loading
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Solution Overview
Problem
The clutch cut off device in industrial vehicles can only control the forward/reverse clutch as either connected or released, leading to uneven movement and increased fuel consumption and brake load when loading materials into a dump truck without clutch cut off, as the vehicle must decelerate or stop against increased engine rotation.
Innovation Solution
An engine speed control device that restricts the maximum rotational speed of the engine based on brake fluid pressure to prevent clutch cut off during loading operations, reducing the load on the brake unit and fuel consumption by limiting engine speed when approaching a dump truck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If clutch cut off is performed by releasing the forward/reverse clutch, then transmission of driving force is cut off, but the movement of the industrial vehicle becomes uneven and operation smoothness deteriorates
Solution Approach 1:
The invention changes the control parameter from binary clutch state (connected/released) to continuous engine speed modulation. By controlling engine speed to decrease before and after brake operation, the system achieves smooth vehicle deceleration without abrupt clutch engagement/disengagement, resolving the contradiction between energy efficiency and operation smoothness
Solution Approach 2:
The invention transitions from static clutch control to dynamic engine speed control. The engine control unit continuously adjusts engine speed based on brake fluid pressure and accelerator pedal position, enabling adaptive control that maintains movement smoothness while reducing fuel consumption during loading operations
2Ease of operation
If clutch cut off is not performed, then movement smoothness is maintained, but fuel consumption increases and brake unit load increases
Solution Approach 1:
The system monitors brake fluid pressure and accelerator pedal position to dynamically adjust engine speed. When brake pressure exceeds a threshold and accelerator pedal is fully depressed, the system identifies loading operation conditions and restricts engine speed to prevent excessive fuel consumption and brake unit overload, while maintaining smooth vehicle operation
3Use of energy by moving object
If engine speed is restricted during loading operations, then fuel consumption and brake unit load are reduced, but vehicle deceleration capability may be affected
Solution Approach 1:
The system uses feedback from brake fluid pressure sensors and accelerator pedal position sensors to continuously monitor operating conditions. When loading operations are detected (high brake pressure + full accelerator depression), the engine control unit applies speed restrictions. The feedback mechanism ensures deceleration capability is maintained by adjusting engine speed based on real-time vehicle state, preventing excessive fuel consumption and brake unit load while preserving necessary deceleration performance
Data Source
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AI summary
An engine speed control device for an industrial vehicle includes an approach detector 33 that detects an approach of the industrial vehicle to an object to be approached; and an engine speed controller 10 that restricts an upper limit of a rotation speed of an engine when the approach detector 33detects an approach of the industrial vehicle to an object to be approached.