Vehicle Control Unit Deceleration Tables for Driver Feel
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Solution Overview
Problem
Conventional vehicle control systems fail to provide a proper braking force that optimizes the driver's feeling, especially when decelerating to a stop without driver intervention, and do not account for individual operator preferences or vehicle types, leading to inconsistent driving experiences.
Innovation Solution
A vehicle control device equipped with a vehicle speed sensor, accelerator opening detecting sensor, and adjustable braking means, which uses deceleration tables to select and apply braking parameters based on operator input or maintenance worker settings, allowing for customizable deceleration control similar to regenerative brakes or hydrostatic transmission systems, and automatically adjusts braking force based on vehicle speed and accelerator position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic deceleration control is applied when the vehicle stops without driver brake operation, then deceleration efficiency is improved, but the operator's operation feeling may be spoiled
Solution Approach 1:
The patent applies dynamics by making the braking force adjustable rather than fixed. The control unit allows operators to select from multiple braking force levels (first through fourth braking forces), transforming a static braking system into a dynamic one that adapts to different operator preferences and conditions, thereby maintaining both deceleration efficiency and operational comfort
Solution Approach 2:
The patent changes the parameter of braking force magnitude by providing multiple selectable levels (first, second, third, and fourth braking forces). This allows the system to adjust the intensity of automatic deceleration based on operator preference, resolving the contradiction between efficient automatic stopping and maintaining natural operation feeling
2Device complexity
If a constant braking force is applied in automatic deceleration control, then the control system is simple, but proper driving feeling cannot be obtained when vehicles are shared by multiple operators
Solution Approach 1:
The patent implements universality by designing a control system that serves multiple operators with different preferences. The multi-level braking force selection mechanism allows the same vehicle to adapt to different driving styles and requirements, making the system universally applicable to various operators while maintaining relatively simple control architecture
Solution Approach 2:
By introducing adjustable braking force levels that can be selected by different operators, the system transforms from a static constant-force approach to a dynamic multi-level system. This maintains control simplicity while significantly improving adaptability to different operators' preferences
3Speed
If braking force is added to decelerate the vehicle, then deceleration performance is improved, but the vehicle may stop in a state where operator does not perform brake operation, potentially spoiling operation feeling
Solution Approach 1:
The patent applies feedback by continuously monitoring accelerator pedal position and vehicle speed to determine when to apply braking force. The control unit detects accelerator operations and automatically applies appropriate braking force to achieve smooth deceleration, then releases braking when the vehicle approaches complete stop, preventing the harsh feeling of stopping without operator intent
Data Source
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AI summary
There is provided a vehicle control device and a vehicle mounted with this device, capable of properly setting a braking force to bring an operator's feeling into an optimal state. In a control device 10 mounted on a vehicle including an accelerator opening detecting sensor 2 which detects an accelerator opening, a vehicle speed sensor 3 which detects a vehicle speed, and braking means (solenoid control brake) 7 capable of adjusting deceleration of the vehicle, the control device includes a storage unit 10b which stores a plurality of deceleration tables 12 in which the deceleration is set according to a predetermined parameter. If the vehicle speed detected by the vehicle speed sensor 3 is equal to or less than a preset vehicle speed V1 and the accelerator opening detected by the accelerator opening detecting sensor 2 is equal to or less than a preset accelerator opening when a target deceleration is selected by the deceleration selecting means 4 and 5, the selection of the deceleration is validated, a deceleration table 12 corresponding to the deceleration selected by the deceleration selecting means is read from the storage unit 10b, and the braking means is actuated on the basis of braking parameters specified in the table, thereby executing deceleration control so as to provide the selected deceleration.