Vehicle Speed Control via Accelerator Position Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vehicle speed control systems lack the necessary functionality and safety for smooth operation at low speeds, particularly in heavy-duty vehicles, where precise control is required for tasks like coupling trailers or navigating challenging environments.
Innovation Solution
A vehicle speed control system that includes a manually movable accelerator mechanism, detection means to sense its position, and a controller that activates the clutch, propulsion unit, or service brake to adjust speed based on the accelerator position, allowing users to set specific speed ratings and control acceleration and retardation rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vehicle operates at low speeds using conventional control methods, then the vehicle can move in reverse or perform coupling tasks, but the engine cannot operate at the required number of revolutions and speed control is imprecise
Solution Approach 1:
The patent introduces a speed control system with detection means and a controller as an intermediary between the driver's accelerator input and the actual vehicle speed. The detection means monitors accelerator position, and the controller calculates target speeds based on pre-stored speed ratings, mediating the control process to achieve precise low-speed control while maintaining reliable engine operation.
Solution Approach 2:
The system changes the control parameter from direct engine speed control to vehicle speed control based on accelerator position. By storing multiple speed ratings (first, second, third speed ratings) corresponding to different accelerator positions, the system enables precise speed control at low speeds without compromising engine operational reliability.
2Ease of operation
If the vehicle uses automated speed control systems, then speed maintenance is improved, but the operator loses manual control flexibility needed for low-speed operations
Solution Approach 1:
The system incorporates feedback by continuously detecting the accelerator mechanism position and using this information to control the vehicle speed. The detection means provides real-time feedback on driver input, and the controller adjusts speed accordingly, maintaining both manual control flexibility and speed control accuracy through a closed-loop control mechanism.
3Adaptability or versatility
If the vehicle operates at very low speeds for coupling or precision tasks, then operational flexibility is improved, but safety and smooth operation cannot be ensured
Solution Approach 1:
The system performs preliminary action by pre-storing multiple speed ratings corresponding to different accelerator positions before actual operation. When the driver moves the accelerator, the controller immediately references the pre-calculated speed ratings to determine the appropriate target speed, enabling safe and smooth low-speed operation without delay or imprecision.
Data Source
AI summary
A vehicle speed control system includes a vehicle accelerator mechanism manually moveable between a plurality of positions, a detection arrangement configured to detect the position of the vehicle accelerator mechanism and to generate an output signal indicative of the position of the vehicle accelerator mechanism, and a vehicle speed controller configured to establish a speed of the vehicle as a function of the detected position of the manually controllable vehicle accelerator mechanism, and to use the output signal as an input speed control signal. A method of controlling speed of a vehicle by a vehicle speed control system is also provided.