Vehicle Control System Blipping Abnormality Detection
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Solution Overview
Problem
In vehicles equipped with automatic transmission gear devices, the lack of blipping control during coast downshift can lead to significant vehicle speed reduction due to unmanaged engine inertia, which existing control systems fail to adequately address.
Innovation Solution
A control system that includes an electronic control unit (ECU) to monitor and execute blipping control, disengaging specific engagement elements like the B2 brake when a blipping abnormality occurs, thereby restricting deceleration during coast downshift, especially in high vehicle speed ranges where excessive deceleration is noted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If blipping control is executed during coast downshift, then vehicle speed reduction is suppressed, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The ECU determines whether to execute blipping control before the coast downshift occurs by checking if the vehicle is in a coasting state. This preliminary determination allows the system to prepare the appropriate control strategy in advance, avoiding the need for complex real-time decision-making during the actual downshift event.
Solution Approach 2:
The system continuously monitors vehicle operating conditions (coasting state detection) and uses this feedback to dynamically adjust whether blipping control is executed. This feedback mechanism allows the system to adapt to changing conditions without requiring overly complex predetermined control logic.
2Speed
If engagement element is disengaged when blipping abnormality occurs, then deceleration is restricted, but transmission control reliability may be compromised
Solution Approach 1:
When a blipping abnormality is detected, the system immediately disengages the engagement element as a countermeasure to prevent excessive deceleration. This preliminary anti-action approach addresses the abnormality proactively rather than waiting for harmful effects to manifest, while the abnormality detection mechanism ensures this action is taken only when genuinely needed.
Solution Approach 2:
The system dynamically adjusts engagement element status based on real-time detection of blipping abnormalities. Rather than maintaining a fixed engagement state, the system transitions between engaged and disengaged states based on abnormality conditions, allowing flexible response to varying operational scenarios while maintaining overall control reliability.
3Speed
If blipping control is executed in all downshift conditions, then vehicle speed is maintained, but unnecessary deceleration control occurs in low speed ranges
Solution Approach 1:
The system applies different control strategies to different operating conditions: blipping control is executed only when the vehicle is in a coasting state, while normal downshift control is used in other conditions. This localized approach ensures that the complex blipping control is applied only where necessary (high-speed coasting scenarios) rather than universally, avoiding unnecessary control actions in low-speed or non-coasting conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively restricts deceleration caused by coast downshift by disengaging engagement elements when blipping abnormalities are detected, preventing unnecessary deceleration and maintaining vehicle stability, especially in high-speed conditions where blipping control is crucial.
Implementation Method 1
a one-way clutch (38)
Implementation Method 2
The engagement elements can be engaged and disengaged
Data Source
AI summary
A control system is for a vehicle. The control system includes an electronic control unit configured to perform a coast downshift, and execute blipping control during performance of the coast downshift. The electronic control unit is configured to determine whether blipping abnormality occurs. The electronic control unit is configured to disengage an engagement element on an engagement side when the blipping abnormality occurs during the performance of the coast downshift. The electronic control unit is configured to increase a speed of the engine in the blipping control. The blipping abnormality is a state that the blipping control is not executed normally during the performance of the coast downshift. The engagement element on the engagement side is an engagement element that is changed from a disengaged state to an engaged state in the coast downshift.