Vehicle Control Apparatus Braking Assist Deceleration Mismatch
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Solution Overview
Problem
Existing vehicle control systems fail to provide the desired deceleration feeling to drivers during braking assist control, as the system-requested deceleration often opposes the driver's request, leading to discomfort due to mismatched expected and actual deceleration sensations.
Innovation Solution
A vehicle control apparatus that performs arithmetic processing to suppress system-requested deceleration changes when the driver requests constant or increasing deceleration, ensuring the driver's request is reflected in the vehicle's deceleration by updating target acceleration and feedback terms to prioritize increased deceleration, and adjusts deceleration accordingly when the driver reduces their request.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the speed control unit decreases the brake pressure according to a set mathematical function when a braking request is output from the driver, then the system can maintain automated braking control, but the driver feels discomfort due to the mismatch between expected deceleration and actual deceleration
Solution Approach 1:
The control unit dynamically adjusts the arithmetic processing method based on the temporal change trend of driver request deceleration. When driver request deceleration is constant or increasing, the system uses first arithmetic processing to suppress system request deceleration from decreasing, while when driver request deceleration is decreasing, the system uses second arithmetic processing to allow system request deceleration to decrease. This dynamic adaptation resolves the contradiction by making the automated system responsive to driver intent while maintaining automation.
Solution Approach 2:
The system changes the parameter of system request deceleration based on the driver request deceleration trend. By suppressing system request deceleration from decreasing when driver request is constant or increasing, and allowing it to decrease when driver request is decreasing, the system aligns automated control with driver expectation, resolving the deceleration feeling mismatch while maintaining automation.
2Extent of automation
If the system combines driver braking request with decreased brake pressure from speed control unit, then the system maintains automated control function, but the combined brake pressure results in insufficient vehicle deceleration
Solution Approach 1:
The control unit changes the parameter calculation method by suppressing system request deceleration from decreasing when driver request deceleration is constant or increasing. This ensures that the combined brake pressure achieves sufficient vehicle deceleration while maintaining automated control function.
3Extent of automation
If the system allows system request deceleration to decrease according to automated control logic, then the system maintains smooth braking operation, but it opposes the driver's increasing deceleration request
Solution Approach 1:
The system dynamically adapts its control logic based on the trend of driver request deceleration. When driver request deceleration is constant or increasing, the system suppresses system request deceleration from decreasing, ensuring adaptability to driver intent. When driver request deceleration is decreasing, the system allows system request deceleration to decrease, maintaining smooth automated control. This dynamic adaptation resolves the contradiction between automated control logic and driver request responsiveness.
Solution Approach 2:
The system uses feedback from the driver request deceleration trend to adjust the system request deceleration behavior. By monitoring whether driver request deceleration is constant, increasing, or decreasing, the system adjusts its arithmetic processing accordingly, ensuring that automated control logic aligns with driver intent while maintaining smooth operation.
Data Source
AI summary
A vehicle control apparatus executes braking assist control to decelerate a vehicle by automatic operation of a braking device. When the vehicle control apparatus obtains a deceleration request from a driver during execution of the braking assist control, while a driver request deceleration requested to the braking device by the driver is constant or in an increasing trend, the vehicle control apparatus executes first arithmetic processing to suppress a system request deceleration requested to the braking device by the braking assist control from being decreased by the braking assist control.