Vehicle Control Arbitration for Stop Hold and Start Responsiveness
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Solution Overview
Problem
In vehicles equipped with multiple driving assistance systems, abnormalities can cause the requested acceleration for maintaining a stopped state to remain constant, leading to delayed vehicle startup when another system or the driver attempts to start the vehicle.
Innovation Solution
A vehicle control device with a processor that sets a lower priority for the first requested value when acquiring predetermined information, preferentially selecting the second requested value to suppress the deterioration of start responsiveness by excluding the first requested value from the selection target and setting an upper limit value for the holding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the requested acceleration for maintaining a stopped state is selected based on a predetermined selection criterion, then the vehicle can maintain a stable stopped state, but the start responsiveness deteriorates when another system or driver attempts to start the vehicle
Solution Approach 1:
The arbitration unit dynamically changes the selection criterion based on vehicle state. When the vehicle is stopped and a start request is detected, the arbitration unit switches to selecting the requested acceleration with the largest absolute value, rather than using a fixed criterion. This dynamic adaptation allows the system to maintain stability during stopped state while enabling responsive startup when needed.
Solution Approach 2:
The system changes the selection parameter from a fixed predetermined criterion to a state-dependent criterion. The arbitration unit monitors vehicle state and adjusts the selection method: using minimum value criterion during normal operation for stability, and switching to maximum absolute value criterion when start requests are detected, thereby resolving the contradiction between stability and responsiveness.
2Reliability
If the requested acceleration remains constant due to system abnormality, then the system can maintain its function, but the vehicle startup is delayed
Solution Approach 1:
The arbitration unit continuously monitors the vehicle state and the requested accelerations from multiple systems. When it detects that the vehicle is in a stopped state and a start request is present, it provides feedback by changing the selection criterion to prioritize startup requests, thereby overcoming the delay caused by constant requested acceleration values from abnormal systems.
Solution Approach 2:
The system performs preliminary detection of start requests from the driver or other systems before actual startup occurs. By detecting the intent to start in advance and pre-adjusting the arbitration criterion, the system prepares for rapid response, preventing the startup delay that would otherwise occur due to constant requested acceleration values.
Data Source
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AI summary
A vehicle control device includes a processor (200). The processor (200) is configured to receive a first requested value of acceleration acting on a vehicle (1) from a first system configured to request holding a stopped state of the vehicle (1). The processor (200) is configured to receive a second requested value of the acceleration from a second system. The processor (200) is configured to select one of the first requested value and the second requested value as an arbitration result. The processor (200) is configured to set a priority for selecting the first requested value lower than a priority for selecting the second requested value when the processor (200) acquires predetermined information from one of the first system and the second system while the vehicle (1) is stopped.