Vehicle Start Control With Two-Stage Force Adjustment
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Solution Overview
Problem
When starting a vehicle by increasing the driving force while decreasing the braking force, the vehicle may experience sudden acceleration, causing discomfort to occupants due to the abrupt change in force dynamics.
Innovation Solution
A vehicle control device that includes a first adjustment processing unit to increase the braking/driving force when the vehicle is stopped, and a second adjustment processing unit to continue increasing the force at a lower speed once the braking/driving force exceeds a predetermined threshold, ensuring smooth acceleration and preventing start delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the braking force is decreased and driving force is increased to start the vehicle, then the vehicle can start moving, but the vehicle may experience sudden acceleration causing discomfort to occupants
Solution Approach 1:
The patent applies dynamics by making the force adjustment mode switchable between first and second modes. The control device dynamically changes the adjustment characteristics based on vehicle conditions, transitioning from a mode that prioritizes quick start (first adjustment mode) to a mode that prioritizes smooth acceleration (second adjustment mode) when the vehicle starts moving, thereby resolving the contradiction between acceleration speed and comfort
Solution Approach 2:
The patent changes the adjustment parameters of braking and driving forces through two distinct adjustment modes. In the first mode, forces are adjusted more aggressively to enable vehicle start, while in the second mode, the adjustment rate is reduced to ensure smooth acceleration. This parameter change approach allows the system to optimize both start capability and acceleration comfort at different stages
2Productivity
If the braking force is decreased and driving force is increased to start the vehicle, then the vehicle can start moving, but the acceleration may be too abrupt immediately after start
Solution Approach 1:
The patent segments the force adjustment process into two distinct phases: the first adjustment mode for initial vehicle start when braking force exceeds driving force, and the second adjustment mode for post-start acceleration when driving force exceeds braking force. This segmentation allows each phase to have optimized adjustment characteristics, ensuring both start capability and acceleration smoothness
Solution Approach 2:
The control device performs preliminary action by determining in advance whether to switch from the first adjustment mode to the second adjustment mode based on the comparison between braking force and driving force. This preliminary determination ensures that the adjustment mode is optimized before the vehicle actually starts moving, preventing abrupt acceleration while maintaining start capability
Data Source
AI summary
A start control device, which is a control device, includes: a first adjustment processing unit configured to execute a first adjustment process of instructing at least one of a brake device and a drive device to increase a braking/driving force when the braking/driving force is negative and the vehicle is stopped; and a second adjustment processing unit configured to start a second adjustment process of instructing at least one of the brake device and the drive device to increase the braking/driving force at a speed lower than an increasing speed of the braking/driving force before end of the first adjustment process on condition that the braking/driving force has become greater than or equal to a determination braking/driving force by the increase in the braking/driving force accompanying the execution of the first adjustment process.