Work Vehicle Engine Speed Control for Slippage Escape
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Solution Overview
Problem
Conventional engine speed control systems for work vehicles face challenges in smoothly escaping from slippage states and returning to constant speed states when slippage occurs while traveling in a constant speed state.
Innovation Solution
An engine speed control system that includes a pedal sensor, a foot accelerator controller, and upper limit setting means, allowing for upper limit rotational speed control when the target engine speed exceeds the set limit, enabling stable constant speed travel and easy transition between speed states by adjusting engine speed through the accelerator pedal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional engine speed control is used to maintain constant speed state, then the vehicle body can travel stably, but escape from slippage state or return to constant speed state is not smooth when slippage occurs
Solution Approach 1:
The patent implements dynamic switching between constant speed control mode and acceleration control mode. When slippage is detected, the system automatically transitions from maintaining constant speed to allowing acceleration, enabling smooth escape from slippage state without requiring manual intervention or complex operational adjustments by the driver.
Solution Approach 2:
The system continuously monitors wheel speed or vehicle state to detect slippage conditions and provides feedback to the control unit. Based on this feedback, the control unit automatically adjusts the engine speed control strategy, switching between constant speed mode and acceleration mode to maintain stability during normal operation while enabling smooth escape when slippage occurs.
2Force
If engine speed is reduced to escape from slippage state, then gripping force increases, but the vehicle body cannot return to constant speed state smoothly
Solution Approach 1:
The system prepares for potential slippage by having the acceleration control mode readily available. When slippage occurs, the engine speed is automatically increased to escape the slippage state and regain gripping force. After escape, the system smoothly transitions back to constant speed control mode, eliminating the need for manual accelerator operation to return to the desired speed state.
3Speed
If accelerator lever operation is required to escape from slippage state, then engine speed can be controlled, but the operation becomes complex and not smooth
Solution Approach 1:
The system performs self-service by automatically detecting slippage conditions and adjusting engine speed without requiring driver intervention. The control unit monitors vehicle state, detects slippage, and automatically switches between constant speed control and acceleration control modes, eliminating the need for the driver to manually operate the accelerator lever to escape slippage states.
Data Source
AI summary
An engine speed control system for a work vehicle comprises a pedal sensor (32) for detecting an operative position of an accelerator pedal (31); a foot accelerator controller for carrying out foot accelerator control in which the engine speed that corresponds to an output of the pedal sensor (32) is used as a target rotational speed; and upper limit setting device (35) for setting the upper limit of the engine speed. The upper limit rotation control in which the upper limit rotational speed is used as the target rotational speed is carried out when the target engine speed is greater than the upper limit rotational speed set by the upper limit setting device (35).