Deceleration Assist Cancellation Using Acceleration Necessity Index
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Solution Overview
Problem
Existing driving support systems may cause discomfort to drivers when deceleration assist control is canceled abruptly due to unintended accelerator pedal operations, leading to inconsistent vehicle behavior that does not align with the driver's intentions.
Innovation Solution
A driving support apparatus that utilizes surrounding and vehicle state sensors to adjust the deceleration assist control cancellation based on both accelerator pedal operation and environmental and vehicle state information, ensuring a smoother transition by varying the rate of braking force reduction according to the calculated acceleration necessity index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the deceleration assist control is canceled quickly when accelerator pedal operation is detected, then the system responds efficiently to driver input, but the driver may feel uncomfortable when the operation was unintentional
Solution Approach 1:
The patent applies dynamics by making the braking force reduction rate variable rather than fixed. The control unit adjusts the reduction rate based on surrounding information (distance to preceding vehicle, relative speed) and vehicle state information (accelerator pedal operation amount, steering operation amount). This dynamic adjustment allows the system to respond quickly when appropriate while reducing discomfort when cancellation might be unintentional.
Solution Approach 2:
The patent changes the parameter of braking force reduction rate based on multiple input parameters. When the accelerator pedal operation amount is large or steering operation amount is large, the reduction rate increases, enabling faster cancellation. When these operation amounts are small, the reduction rate decreases, providing smoother cancellation to avoid driver discomfort. This parameter change approach resolves the contradiction between quick response and driver comfort.
2Device complexity
If the braking force is reduced based only on accelerator pedal operation amount, then the control logic is simple, but the driver comfort is compromised in complex driving scenarios
Solution Approach 1:
The patent implements multi-functionality by having the control unit process multiple types of information simultaneously: surrounding information from sensors detecting preceding vehicles and road markings, vehicle state information from sensors detecting accelerator and brake pedal operations, and steering operation information. This comprehensive approach allows the system to adapt to various driving scenarios while maintaining a unified control framework.
Solution Approach 2:
The patent applies feedback by continuously monitoring multiple parameters including accelerator pedal operation amount, brake pedal operation amount, steering operation amount, distance to preceding vehicle, and relative speed. The control unit uses this feedback information to dynamically adjust the braking force reduction rate, ensuring appropriate driver comfort across different driving conditions while maintaining relatively simple control logic.
Data Source
AI summary
A driving support apparatus includes a surrounding sensor capable of acquiring surrounding information on a three-dimensional object around a vehicle and a road marking ahead of the vehicle, and a vehicle state sensor capable of acquiring vehicle state information on multiple types of vehicle states in response to driving operation by a driver, including an AP operation amount in response to the driver's AP operation as one of the vehicle states. The apparatus further includes a control unit configured to execute deceleration assist control to assist deceleration when a predetermined start condition is satisfied, and to cancel the deceleration assist control when a cancel condition which is satisfied when the AP operation is performed during execution of the deceleration assist control is satisfied. When the cancel condition is satisfied, the control unit reduces the braking force based on the surrounding information and the vehicle state information.