Industrial Vehicle Torque Control for Eco-Mode Performance
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Solution Overview
Problem
Industrial vehicles, such as forklift trucks, face challenges in improving fuel efficiency while maintaining performance due to torque restrictions in Eco-mode, as they often require higher torque for heavy loads and specific operations, leading to potential failures in loading and speed limitations.
Innovation Solution
An industrial vehicle system that includes an accelerator sensor, loading unit, and control units to dynamically release and resume torque restrictions based on predetermined conditions, such as accelerator opening, vehicle speed, and lifting operations, allowing for adaptive torque control in Eco-mode to balance fuel efficiency and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If torque restriction is applied in Eco-mode to improve fuel efficiency, then fuel consumption is reduced, but vehicle performance deteriorates due to insufficient torque for heavy loads and maximum speed achievement
Solution Approach 1:
The torque restriction control is made dynamic by continuously monitoring accelerator opening degree, vehicle speed, and loading unit position. The control system adjusts torque restriction levels based on real-time operating conditions, transitioning between restricted and unrestricted states as needed to maintain both fuel efficiency and performance
Solution Approach 2:
The system changes the torque restriction parameter based on detected operating conditions. When accelerator opening exceeds threshold, vehicle speed exceeds threshold, or loading unit is in lifting operation, the torque restriction parameter is adjusted to provide full power, otherwise it maintains restricted torque for fuel efficiency
2Use of energy by moving object
If torque restriction is continuously applied in Eco-mode, then fuel efficiency is improved, but loading operation reliability deteriorates due to insufficient torque for lifting operations
Solution Approach 1:
The control system uses feedback from the loading unit position sensor to detect lifting operations. When the loading unit is detected to be in a lifting operation state, the system provides feedback to the torque control unit to release torque restriction, ensuring reliable loading operation while maintaining fuel efficiency during non-lifting operations
3Use of energy by moving object
If torque restriction is applied to maintain fuel efficiency, then energy consumption is reduced, but vehicle speed capability deteriorates due to insufficient torque for achieving maximum speed
Solution Approach 1:
The torque restriction control dynamically responds to vehicle speed conditions. When vehicle speed exceeds a predetermined threshold, the system automatically releases torque restriction to enable achievement of maximum vehicle speed, while maintaining restricted torque at lower speeds to optimize fuel consumption
Data Source
Figure 1
Figure 2A~3
AI summary
An industrial vehicle (10) includes an accelerator (29), an accelerator opening sensor (30) which detects an opening of the accelerator (29), a loading unit (11), an engine (19) and a torque restriction releasing unit (32). When the torque restriction releasing unit (32) is set in an Eco-mode in which torque of the engine (19) is restricted, if the opening of the accelerator (29) detected by the accelerator opening sensor (30) is a first predetermined value (XA) or greater and at least one of conditions that a speed of the vehicle is a second predetermined value (YA) or greater and that the loading unit (11) is in a lifting operation, is satisfied and such conditions of the accelerator (29) and the vehicle speed and/or lifting operation are continued for a predetermined period of time, the torque restriction releasing unit (32) releases the torque restriction.