Work Vehicle Engine Speed Control for Reverse Torque
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Solution Overview
Problem
Conventional work vehicles face the issue of excessively large driving torque when reversing, leading to inconvenience such as the vehicle riding up a wheel stopper during parking, due to the lack of distinct engine rotational speed control between forward and reverse traveling states.
Innovation Solution
A work vehicle equipped with a travelling state determination unit and a control unit that restricts the upper limit value of the engine's target rotational speed to a lower value when in reverse traveling state, using a transmission system and accelerator operation tool, ensuring appropriate engine control based on pre-defined map data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the upper limit value of the target rotational speed of the engine is set to be the same in both forward and reverse traveling states, then the engine can provide sufficient power for forward traveling, but the driving torque becomes excessively large during reverse traveling causing the vehicle to ride up wheel stoppers
Solution Approach 1:
The patent applies local quality by setting different upper limit values for the target rotational speed of the engine based on the traveling direction. Specifically, a first upper limit value is set for forward traveling state and a second lower upper limit value is set for reverse traveling state. This allows the engine to provide sufficient power for forward traveling while restricting excessive power output during reverse traveling, thereby preventing the vehicle from riding up wheel stoppers.
2Productivity
If the accelerator operation tool is greatly operated during reverse traveling, then the target rotational speed of the engine increases, but this causes the driving torque to become excessively large leading to safety issues
Solution Approach 1:
The patent applies preliminary anti-action by preemptively restricting the upper limit value of the target rotational speed of the engine when the traveling body is in the reverse traveling state. By setting the second upper limit value (which is lower than the first upper limit value) before excessive accelerator operation occurs, the system prevents the driving torque from becoming excessively large even if the accelerator operation tool is greatly operated, thereby ensuring reverse traveling safety.
3Speed
If the engine rotational speed is not restricted during reverse traveling, then the vehicle can respond quickly to operator input, but this causes excessive driving torque that may damage the vehicle or cause accidents
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the upper limit value of the target rotational speed of the engine based on the traveling state. The control unit determines whether the traveling body is in forward or reverse traveling state and accordingly sets the first or second upper limit value. This dynamic adjustment allows the engine to respond appropriately to operator input while preventing excessive driving torque during reverse traveling, thus balancing responsiveness with safety.
Data Source
AI summary
A work vehicle includes a travelling state determination unit capable of determining a travelling state of a travelling body, and a control unit that restricts, if it has been determined by the travelling state determination unit that the travelling body is in a reverse travelling state, an upper limit value of a target rotational speed of an engine that is based on an operation on an accelerator operation tool to be a lower value than in a case where it has been determined by the travelling state determination unit that the travelling body is in a forward travelling state.