Hybrid Vehicle Battery Protection via Virtual Accelerator Control
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Solution Overview
Problem
High voltage batteries in hybrid electric vehicles are prone to overcharging and damage due to high-speed rotation of the motor and inverter system failures, leading to reduced durability and potential safety hazards like fires, with existing solutions requiring excessive shifting and temporal overcharging.
Innovation Solution
A method that restricts shifting stages and controls engine speed by setting a virtual acceleration pedal value and maintaining a desired shifting map to prevent high-speed rotation, switching engine control modes from torque control to speed control when necessary, and adjusting engine speed within predetermined regions to prevent overcharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific shifting map is provided to prevent overcharging when the motor breaks, then battery overcharging is prevented, but excessive shifting occurs and temporal overcharging is generated
Solution Approach 1:
The patent applies preliminary action by pre-setting a virtual acceleration pedal value that corresponds to a safe operating range for the battery. When motor breakdown is detected, this pre-configured virtual value is immediately applied to determine the desired shifting stage, preventing overcharging before it can occur. This eliminates the need for complex real-time calculations and excessive shifting operations.
Solution Approach 2:
The patent changes the parameter of acceleration pedal value from its normal operational range to a restricted virtual range that ensures motor speed remains within safe limits. By modifying this key parameter to a predetermined safe value, the system directly controls the shifting behavior to prevent battery overcharging without requiring excessive shifting operations.
2Productivity
If the motor operates at high speed to maintain vehicle performance, then acceleration performance is improved, but the battery may be overcharged and damaged
Solution Approach 1:
The patent introduces a virtual acceleration pedal value as an intermediary between the driver's acceleration request and the actual motor control. This virtual value acts as a mediator that translates acceleration demands into safe operating parameters, ensuring the motor speed remains within a range that prevents battery overcharging while still providing acceptable vehicle performance.
Solution Approach 2:
The patent applies preliminary anti-action by pre-restricting the motor speed through the virtual acceleration pedal value before high-speed operation can cause battery overcharging. This preventive measure counteracts the potential harmful effect of high-speed motor operation on battery durability, allowing the system to maintain reliability while preserving adequate acceleration performance.
Data Source
AI summary
The present invention protects a high voltage battery in a hybrid electric vehicle. More particularly, it makes it possible to prevent a battery from being overcharged when a motor or an inverter system breaks, with the hybrid vehicle traveling. The technique for protecting a high voltage battery in a hybrid electric vehicle illustratively comprises: checking whether a motor functions properly; setting a virtual acceleration pedal value and keeping a present desired shifting map, when the motor breaks; determining a desired shifting stage according to the present desired shifting map based on the virtual acceleration pedal value; and, in certain embodiments, switching or keeping the engine control mode by comparing a value of a predetermined maximum engine speed region with the present engine speed in order to prevent high-speed rotation of the motor.