Vehicular Braking Control Inhibiting Cancellation During Speed Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicular braking/driving-force control systems may incorrectly inhibit automatic braking when the driver intends to accelerate, due to driving-force limiting control limiting the accelerator's representation of acceleration intention.
Innovation Solution
A vehicular braking/driving-force control apparatus that includes an accelerator operation detection system, driving-force limiting control, automatic braking control, and a control mechanism to inhibit cancellation of automatic braking based on accelerator operation, ensuring accurate representation of driver intent during driving-force limiting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving-force limiting control is activated to limit driving force and prevent upper-limit speed from being exceeded, then speed control reliability is improved, but accelerator operation no longer accurately represents driver acceleration intention
Solution Approach 1:
The control part acts as an intermediary between the accelerator operation detection part and the automatic braking control apparatus. It receives the accelerator operation signal, determines whether driving-force limiting control is activated, and selectively transmits or blocks the cancellation signal to the automatic braking control apparatus. This intermediary function resolves the contradiction by preventing the inaccurate accelerator signal from reaching the braking system when driving-force limiting is active, while allowing accurate signals to pass through when it is not active.
Solution Approach 2:
The system dynamically adjusts the functionality of the cancellation function based on the activation state of driving-force limiting control. When driving-force limiting control is not activated, the cancellation function operates normally to prevent automatic braking. When driving-force limiting control is activated, the control part inhibits the cancellation function from executing, allowing automatic braking to proceed. This dynamic adjustment resolves the contradiction by adapting the system's response to accelerator operation based on the current control state.
2Measurement precision
If automatic braking control is inhibited based on accelerator operation to respect driver acceleration intention, then driver intent recognition is improved, but automatic braking may not start when driver actually intends to accelerate under driving-force limiting conditions
Solution Approach 1:
The control part serves as an intermediary that filters accelerator operation signals based on the activation state of driving-force limiting control. When driving-force limiting control is activated, the control part blocks the cancellation signal that would otherwise prevent automatic braking. This ensures that automatic braking can start even when the accelerator is operated, resolving the reliability issue while maintaining accurate driver intent recognition when driving-force limiting is not active.
Solution Approach 2:
The system changes the operational parameter of the cancellation function based on the activation state of driving-force limiting control. Specifically, the control part modifies the effectiveness of the cancellation function: it is fully effective when driving-force limiting control is not activated, and it is inhibited from executing when driving-force limiting control is activated. This parameter change resolves the contradiction by adapting the cancellation function's behavior to the current control state.
3Ease of operation
If cancellation function is allowed to execute normally to prevent automatic braking during driver acceleration, then ease of operation is improved, but safety is reduced when driving-force limiting control is active
Solution Approach 1:
The system dynamically modifies the operation of the cancellation function based on the activation state of driving-force limiting control. When driving-force limiting control is not activated, the cancellation function operates normally, allowing automatic braking to be easily prevented during driver acceleration. When driving-force limiting control is activated, the control part inhibits the cancellation function, ensuring automatic braking can start for safety. This dynamic adjustment resolves the contradiction by adapting the cancellation function's effectiveness to the current control state.
Solution Approach 2:
The control part acts as an intermediary between the cancellation function and the automatic braking control apparatus. It selectively blocks or transmits the cancellation signal based on whether driving-force limiting control is activated. This intermediary function resolves the contradiction by preventing the cancellation function from incorrectly preventing automatic braking when driving-force limiting is active, while allowing normal operation when it is not active.
Data Source
AI summary
A vehicular braking/driving-force control apparatus includes an accelerator operation detection part configured to detect an accelerator operation; a driving-force limiting apparatus configured to carry out driving-force limiting control of limiting driving force of an own vehicle in such a manner that an upper-limit speed that is set will not be exceeded; an automatic braking control apparatus configured to carry out automatic braking control of automatically generating braking force in the own vehicle based on a relative distance or a relative speed between an obstacle in front of the own vehicle and the own vehicle, and have a cancellation function of inhibiting a start of the automatic braking control based on the accelerator operation; and a control part configured to inhibit the cancellation function from being executed when the driving-force limiting apparatus is in an activated state where the driving-force limiting apparatus is allowed to carry out the driving-force limiting control.