Industrial Vehicle Speed Control via Dynamic Accelerator Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Industrial vehicles using engines as a drive source face challenges in improving fuel economy due to inefficient speed control mechanisms.
Innovation Solution
A vehicle speed control device that includes a vehicle speed detector and a controller to derive and set vehicle speed limit values, adjusting engine rotation speed to control industrial vehicle speed, particularly by varying the speed limit based on accelerator pedal operation and actual speed, thereby optimizing fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the vehicle speed control device limits vehicle acceleration by setting upper limit values based on actual speed and predetermined limit values, then fuel economy is improved, but vehicle acceleration performance may be restricted
Solution Approach 1:
The speed limit value is not fixed but dynamically adjusted based on the deviation between target speed and actual speed. When deviation is large, the speed limit value is set higher to allow faster acceleration; when deviation is small, the speed limit value is reduced to improve fuel economy. This dynamic adjustment resolves the contradiction between acceleration performance and fuel economy.
Solution Approach 2:
The invention changes the parameter of speed limit value based on operating conditions (deviation between target and actual speed). By varying this parameter according to real-time feedback, the system achieves both good acceleration response and improved fuel economy, resolving the technical contradiction.
2Loss of energy
If the controller derives vehicle speed limit values by adding predetermined limit values to actual vehicle speed, then fuel consumption is reduced, but the vehicle may not reach maximum speed quickly enough
Solution Approach 1:
The speed limit value is dynamically adjusted based on the deviation between target speed and actual speed. When the deviation is large (vehicle needs to accelerate quickly), the speed limit value is set higher, reducing time loss. When the deviation is small (vehicle is near target speed), the speed limit value is reduced to minimize energy loss. This dynamic approach resolves the contradiction between fuel consumption and time to reach maximum speed.
Solution Approach 2:
The controller preliminarily sets an appropriate speed limit value before the vehicle reaches the target speed, based on the current deviation. This preliminary action ensures that the vehicle can accelerate efficiently without excessive fuel consumption, resolving the contradiction between energy loss and time loss.
3Use of energy by moving object
If the vehicle speed control device continuously adjusts engine rotation speed to maintain speed within limit values, then fuel efficiency is improved, but control system complexity increases
Solution Approach 1:
The control system uses feedback from the vehicle speed detector to continuously monitor actual speed and compare it with the target speed. Based on this feedback, the controller adjusts the speed limit value and engine rotation speed to maintain optimal fuel efficiency. The feedback mechanism enables improved fuel efficiency without requiring overly complex control logic.
Solution Approach 2:
The control system automatically adjusts the speed limit value and engine rotation speed based on real-time speed deviation, without requiring manual intervention. This self-service capability improves fuel efficiency while keeping the control system relatively simple, as the system manages its own optimization.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A vehicle speed control device for an industrial vehicle is configured to control a vehicle speed of the industrial vehicle. The vehicle speed control device includes an operation detector that is configured to detect whether an accelerator pedal is being operated and a controller that is configured to control the vehicle speed of the industrial vehicle by controlling the rotation speed of the engine. The controller is configured to derive a vehicle speed limit value that increases during an operated state of the accelerator pedal and decreases during a non-operated state of the accelerator pedal, and set an upper limit value of the vehicle speed to the derived vehicle speed limit value.