Work Vehicle Engine Speed Control via Sensor-Based Mode Transition
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Solution Overview
Problem
Existing engine speed control systems for work vehicles often result in an unnecessary increase in engine output speed when the input device is operated in a stopped vehicle state, particularly when the accelerator lever is in the idling position, leading to inefficient power transmission and increased engine speed without corresponding vehicle movement.
Innovation Solution
The engine speed control system incorporates a pedal sensor, foot accelerator controller, lever sensor, hand accelerator controller, and constant rotation controller, which only initiates constant rotation control when the engine speed exceeds idling speed, ensuring that power transmission is maintained only when necessary, and transitions between different speed control modes based on sensor inputs to optimize engine speed according to vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant rotation control is carried out by operating the input device in a stopped vehicle state with the accelerator lever in the idling position, then the engine speed can be increased to a stored value, but the engine output speed increases unnecessarily without corresponding vehicle movement
Solution Approach 1:
The system dynamically adjusts the responsiveness of the input device based on vehicle state. When the vehicle is moving, the input device operates normally to switch between constant rotation control and accelerator control. When the vehicle is stopped, the input device's function is restricted to prevent unnecessary engine speed increases, creating a dynamic adaptation to operational conditions
Solution Approach 2:
The control system continuously monitors vehicle speed and accelerator lever position to determine whether the vehicle is in a stopped state. This feedback mechanism prevents the input device from activating constant rotation control when the vehicle is stopped, thereby avoiding unnecessary energy consumption while maintaining normal functionality when the vehicle is moving
2Adaptability or versatility
If the input device is made responsive to switch between constant rotation control and accelerator control, then control flexibility is improved, but the system may respond inappropriately when the vehicle is stopped
Solution Approach 1:
The system's response characteristics change dynamically based on vehicle state. The control unit evaluates real-time conditions (vehicle speed, accelerator position) to determine whether input device operations should trigger constant rotation control or be ignored, ensuring reliable and context-appropriate responses
Solution Approach 2:
The input device's functionality is differentiated based on local system conditions. When the vehicle is moving, the input device maintains full functionality for mode switching. When stopped, its ability to trigger constant rotation control is locally disabled, preserving reliability by preventing inappropriate responses while maintaining adaptability during normal operation
Data Source
AI summary
The engine speed control system for a work vehicle has a foot accelerator controller for carrying out foot accelerator control based on a pedal sensor, a hand accelerator controller for carrying out hand accelerator control based on a lever sensor, a manually operated input device, storage means for storing a predetermined engine speed, and a constant rotation controller for carrying out constant rotation control in which the engine speed stored in the storage means is used as the target rotational speed on the basis of an input to the input device. The constant rotation control is carried out when the input device has been operated in the case that the engine speed that corresponds to the output of the lever sensor is greater than an idling speed, and the constant rotation control is terminated when the input device is operated in the case that the engine speed that corresponds to the output of the lever sensor is equal to or less than the idling speed.