Series Hybrid Engine Fuel Cut for Turbo Overrun Control
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Solution Overview
Problem
In series hybrid vehicles with an engine having a supercharger, the response delay of engine torque can lead to a delayed decrease in engine torque, causing electric power generation to exceed system receivable limits, potentially resulting in an abrupt increase in engine revolution.
Innovation Solution
Implement a control method that performs fuel cut of the engine when the excess engine torque exceeds the drive engine torque corresponding to system receivable electric power, and the engine is supercharged, thereby preventing an abrupt increase in engine revolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine torque is increased to meet power demand, then the power output is improved, but the electric power generation exceeds system receivable limits causing abrupt engine revolution increase
Solution Approach 1:
The control device performs fuel cut before the engine torque can exceed the system receivable electric power limit. By detecting when the engine torque is approaching the threshold that would cause excess electric power generation, the system preemptively cuts fuel supply to prevent the harmful effect of abrupt engine revolution increase, rather than reacting after the problem occurs
Solution Approach 2:
The control device calculates the drive engine torque corresponding to system receivable electric power in advance and compares it with the actual engine torque. This preliminary calculation and comparison enable the system to anticipate when fuel cut is needed, allowing smooth transition to fuel cut mode before the torque excess condition is fully established
2Power
If fuel cut is performed to reduce engine torque quickly, then the electric power generation is controlled within system limits, but the engine torque response becomes delayed
Solution Approach 1:
The control system dynamically adjusts the fuel cut timing and duration based on real-time engine torque conditions and system receivable electric power limits. Rather than using a fixed fuel cut strategy, the system continuously monitors engine torque and adjusts fuel supply accordingly, enabling adaptive control that responds to changing operating conditions while maintaining electric power within acceptable ranges
Data Source
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AI summary
A vehicle 1 is a series hybrid vehicle that drives drive wheels 6 using a travel motor 4 by utilizing power of a power generation motor 3, which generates power by being driven by motive power of an internal combustion engine 2 provided with a turbo charger 7. A method for controlling the vehicle 1 includes executing a fuel cut of the internal combustion engine 2 when excess power EP_OVER is greater than at least power EP_SYS that can be inputted in the system and the internal combustion engine is being supercharged.