Hybrid Vehicle Stall Control via Dynamic Battery Power Monitoring
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Solution Overview
Problem
Hybrid electric vehicles face the challenge of vehicle stall when battery discharge power boundaries drop rapidly during steady throttle conditions, which existing control methods fail to address adequately.
Innovation Solution
A stall control method that involves acquiring power demand parameters and discharge power boundaries to determine stall risks, starting the engine when necessary, and monitoring its power output to ensure stability, and controlling engine shutdown based on real-time power demand and battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the engine is started in advance and power is reserved for engine starting, then driving smoothness is improved, but the risk of vehicle stall increases when battery discharge power boundary drops rapidly
Solution Approach 1:
The control method continuously monitors battery discharge power boundary and compares it with required power for engine starting and vehicle operation. This feedback mechanism allows the system to adjust engine starting timing dynamically - when battery power is sufficient, engine starts in advance for smoothness; when battery power is insufficient, engine starting is delayed or avoided to prevent stall, thus resolving the contradiction between driving smoothness and stall risk
Solution Approach 2:
The system transitions from a static engine starting strategy to a dynamic one that adapts to real-time battery power conditions. The engine starting control is made flexible by continuously evaluating battery discharge capability and adjusting starting timing accordingly, allowing the system to optimize between smoothness and stall prevention based on current power availability
2Reliability
If the engine is started to prevent vehicle stall, then vehicle safety is improved, but driving smoothness deteriorates due to sudden power change
Solution Approach 1:
The system performs preliminary assessment of battery power capacity before triggering engine starting. By evaluating whether battery discharge power boundary can support both current vehicle load and engine starting power requirements, the system ensures that engine starting only occurs when power conditions permit, thus preventing stall while minimizing sudden power changes that would affect smoothness
Solution Approach 2:
The control method uses real-time feedback on battery power state to determine the optimal moment for engine starting. When battery power drops to a critical threshold that could cause stall, the system triggers engine starting while ensuring sufficient power margin remains for smooth transition, thereby balancing safety improvement with smoothness maintenance
3Reliability
If the engine operates continuously to ensure sufficient power supply, then power reliability is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous engine operation, the system implements periodic engine starting based on battery power threshold evaluation. The engine starts only when battery discharge power boundary indicates insufficient power capacity, and stops when battery power recovers to sufficient levels. This periodic action pattern maintains power reliability while minimizing unnecessary energy consumption from continuous engine operation
Data Source
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AI summary
The present application provides a stall control method and apparatus for a hybrid vehicle, a computer device, and a storage medium. The method comprises: acquiring first power demand parameters of a target vehicle during the current driving process and a first discharge power boundary of a battery in the target vehicle; if it is determined, based on the first power demand parameters and the first discharge power boundary, that the target vehicle currently has a stall risk, starting an engine of the target vehicle and monitoring whether the engine power reaches a target power; if the target power is reached, acquiring second power demand parameters of the target vehicle and a second discharge power boundary of the battery; and controlling the engine to shut down according to the second discharge power boundary and the second power demand parameters. The present application solves the problem of vehicle stall when the battery discharge power boundary drops rapidly while the vehicle is in a pure electric mode and under steady throttle conditions.