Vehicular Control System Slippery State Deceleration
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Solution Overview
Problem
When a vehicle is in a slippery state, the driver may unintentionally enter the deceleration region of the one-pedal mode, leading to rapid wheel deceleration and potential slipping, causing discomfort.
Innovation Solution
A vehicular control system that includes a controller, a state detector, and corrected operation quantity acquiring means to adjust the deceleration and acceleration regions based on the vehicle's slipping state, reducing maximum deceleration and varying deceleration/acceleration quantities to prevent slipping and discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the deceleration region is formed in the one-pedal mode with a relatively small operation quantity range, then the acceleration region can be expanded to a larger operation quantity range, but when the driver returns the accelerator pedal in a slippery state, the vehicle may unintentionally enter the deceleration region causing rapid wheel deceleration and wheel slipping
Solution Approach 1:
The patent dynamically adjusts the deceleration threshold value based on vehicle operating conditions (speed, acceleration, brake status). When the vehicle is in a slippery state, the deceleration threshold is increased to prevent unintentional entry into the deceleration region, while maintaining the one-pedal mode's acceleration region benefits.
Solution Approach 2:
The system changes the deceleration threshold parameter adaptively according to vehicle state. By modifying this critical parameter based on detected conditions (such as wheel slip detection, brake application, vehicle speed), the system prevents harmful deceleration while preserving the expanded acceleration region functionality.
2Speed
If the maximum deceleration is set to be large in the deceleration region, then the deceleration performance is improved, but the vehicle wheels become liable to slip unintentionally when the driver returns the accelerator pedal, causing driver discomfort
Solution Approach 1:
The system applies preliminary anti-action by detecting potential slippery conditions in advance and preemptively adjusting the deceleration threshold or reducing maximum deceleration limits. This prevents the harmful effect of wheel slipping before it occurs by anticipating the driver's pedal return action during slippery conditions.
Solution Approach 2:
The system converts the potentially harmful rapid deceleration into a beneficial controlled deceleration by using the detected slippery state information to modulate the deceleration profile. The harmful rapid wheel deceleration is transformed into a controlled, slip-free deceleration that maintains vehicle stability while still achieving speed reduction.
3Ease of operation
If the deceleration in the deceleration region is controlled to increase as the operation quantity decreases, then the deceleration responsiveness is improved, but in a slippery state this causes the vehicle wheels to slip unintentionally when the driver returns the accelerator pedal
Solution Approach 1:
The patent makes the deceleration control dynamic by continuously monitoring vehicle state and adjusting the deceleration rate accordingly. In slippery conditions, the system dynamically reduces the deceleration rate or increases the threshold, preventing wheel slip while maintaining responsive deceleration control in normal conditions.
Data Source
AI summary
The system is provided with a controller that controls the acceleration and deceleration of the vehicle according to the operation quantity of an accelerator pedal, and a state detector that determines whether a wheel is in a slippery state. The controller sets a deceleration region corresponding to a relatively small amount of operation and an acceleration region corresponding to a relatively large operation quantity regarding the operation quantity, and controls such that, in at least partially, the deceleration of the vehicle is increased as the operation quantity decreases, while in at least a part of the acceleration region, the acceleration of the vehicle is increased as the operation quantity increases. When the state detector detects a slippery state, the controller decreases the maximum deceleration that can be produced in the deceleration region.