Work Vehicle Torque Control for Rough Terrain and Ride Comfort
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Solution Overview
Problem
Existing work vehicles with continuously variable transmissions can experience excessive acceleration when an operator depresses the accelerator strongly, leading to reduced riding comfort, and restricting output torque to prevent strong acceleration results in insufficient torque on rough roads.
Innovation Solution
A control device for work vehicles that includes a required output torque determination unit, a traveling load estimation unit, and a required output torque correction unit to ensure the output torque remains within an allowable range, preventing excessive acceleration while maintaining sufficient torque for various terrain conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If output torque is increased to provide strong acceleration capability for rough roads and steep slopes, then vehicle performance on difficult terrain is improved, but excessive acceleration is generated during normal travel reducing riding comfort
Solution Approach 1:
The patent implements dynamic torque control by continuously adjusting the output torque based on real-time detection of vehicle state (traveling speed, acceleration) and operation device input. The control device dynamically modifies the required output torque to match actual traveling conditions, ensuring high torque availability when needed while preventing excessive acceleration during normal travel.
Solution Approach 2:
The control device employs feedback mechanisms by detecting the actual traveling speed and acceleration of the work vehicle, then comparing these values against desired ranges. Based on this feedback, the control device adjusts the output torque command to the drive source, creating a closed-loop control system that prevents excessive acceleration while maintaining sufficient torque for rough terrain.
2Object-affected harmful factors
If output torque is restricted to prevent excessive acceleration during normal travel, then riding comfort is improved, but insufficient torque is available on rough roads reducing vehicle performance
Solution Approach 1:
The control system dynamically adjusts torque restrictions based on detected traveling conditions. When the vehicle is traveling on normal surfaces, torque is restricted to prevent excessive acceleration. When rough terrain or steep slopes are detected (through acceleration and speed patterns), the restriction is relaxed or removed to provide sufficient torque for maintaining performance.
Solution Approach 2:
The patent changes the torque output parameter dynamically based on operating conditions. The control device modifies the required output torque value according to detected acceleration and speed, effectively changing the torque parameter from a fixed restricted value to a variable value that adapts to terrain conditions, ensuring both comfort and performance requirements are met.
3Productivity
If high torque is applied to the traveling device for work operations such as excavation and towing, then work capability is improved, but unnecessary strong acceleration is generated during travel reducing operational efficiency
Solution Approach 1:
The control device dynamically adjusts torque application based on the operational phase detection. During travel phases, torque is moderated to prevent unnecessary acceleration that would waste energy and time. During work operations (excavation, towing), the system detects the increased load requirements and applies high torque appropriately, optimizing the balance between work capability and operational efficiency.
Data Source
AI summary
A control device of a work vehicle includes a required output torque determination unit that determines a required output torque of the power transmission device based on an operation amount of the operation device and a traveling speed of the work vehicle, a traveling load estimation unit that estimates a traveling load torque related to a traveling load on the work vehicle, a required output torque correction unit that corrects the required output torque such that the required output torque is included in an allowable output torque range including an estimated traveling load torque, and a drive source control unit that outputs a control signal for the drive source based on a corrected required output torque.