Industrial Vehicle Regenerative Braking Limit Control
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Solution Overview
Problem
Industrial vehicles face discomfort due to the difference between assumed and actual movement during acceleration, deceleration, or stopping, which affects sensory performance.
Innovation Solution
An industrial vehicle with a control unit that switches between normal travel mode and vehicle speed limit mode, using an accelerator operation member, direction instruction member, target speed calculation, direction calculation, vehicle speed calculation, and a switching unit to manage regenerative braking limits, allowing for improved sensory performance by controlling vehicle speed and direction based on driver input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If regenerative braking limit is released to improve deceleration performance, then braking efficiency is improved, but driver discomfort increases due to abrupt movement changes
Solution Approach 1:
The regenerative braking limit value is made dynamically adjustable based on vehicle operating conditions. The control unit switches between a first regenerative braking limit value (higher) and a second regenerative braking limit value (lower) according to whether the vehicle is in normal travel mode or vehicle speed limit mode, optimizing both braking efficiency and driver comfort for different operating scenarios
Solution Approach 2:
The patent changes the regenerative braking limit parameter based on the vehicle's travel mode. When switching from normal travel mode to vehicle speed limit mode, the control unit adjusts the regenerative braking limit value to prevent abrupt deceleration that would cause driver discomfort, while still maintaining effective braking capability
2Reliability
If vehicle speed limit mode is activated to improve safety, then vehicle speed control is improved, but sensory performance deteriorates due to movement discontinuity
Solution Approach 1:
The control unit performs preliminary adjustment of the regenerative braking limit value before and during mode transitions. By anticipating the switch from normal travel mode to vehicle speed limit mode, the system pre-adjusts braking parameters to ensure smooth transition and maintain sensory performance while achieving speed control
Solution Approach 2:
The system continuously monitors vehicle operating conditions and provides feedback to the control unit, which adjusts the regenerative braking limit accordingly. This feedback mechanism ensures that transitions between travel modes are smooth and maintain driver comfort while achieving the desired speed control
Data Source
AI summary
An industrial vehicle including: a direction calculation unit that calculates an instructed travel direction of the vehicle based on an operation position of the direction instruction member; a vehicle speed calculation unit that calculates an actual speed of the vehicle; a switching unit that switches between permission and prohibition of regenerative braking limit; and a control unit that controls traveling of the vehicle. The control unit is configured to be switchable between a regenerative braking limit state where the regenerative braking limit is performed and a regenerative braking limit release state where the regenerative braking limit is released, when the vehicle speed limit mode is activated and the regenerative braking limit is permitted. The control unit has at least one control pattern that switches between the regenerative braking limit state and the regenerative braking limit release state when a predetermined condition is satisfied.