Series Hybrid Engine Control for GPF Overheat and Deceleration
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Solution Overview
Problem
In series hybrid vehicles, when fuel cut is prohibited to prevent overheating of the gasoline particulate filter, deceleration cannot be secured during power consumption operations, leading to potential filter overheating if fuel runs out.
Innovation Solution
A method for controlling the vehicle that includes performing a power consumption operation by generating negative ENG torque in the engine while driving it with the generator, detecting when fuel injection stops, and stopping the generator to prevent overheating of the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fuel cut is prohibited to prevent filter overheating, then filter temperature is controlled, but deceleration performance deteriorates because regeneration cannot be performed
Solution Approach 1:
The system dynamically switches between power consumption operations (retard discharge with negative ENG torque) and regeneration based on battery charge state and filter temperature conditions, allowing optimal deceleration performance while preventing filter overheating
Solution Approach 2:
The control system changes operational parameters (engine torque, generator torque, fuel injection state) based on battery SOC and filter temperature to resolve the contradiction between maintaining filter temperature control and enabling deceleration through regeneration
2Productivity
If power consumption operation is performed with negative ENG torque to enable deceleration, then deceleration performance is improved, but fuel may run out causing filter overheating
Solution Approach 1:
The control system continuously monitors fuel injection state through generator torque feedback and dynamically adjusts operation mode to prevent fuel exhaustion and filter overheating while maintaining deceleration capability
Solution Approach 2:
The system performs preliminary checks of fuel injection status and battery charge state before initiating power consumption operations, preventing fuel exhaustion and ensuring filter temperature control is maintained
3Productivity
If regeneration is performed to secure deceleration, then deceleration performance is improved, but battery charge state must be available which may conflict with filter temperature control
Solution Approach 1:
The system dynamically selects between regeneration and power consumption operations based on real-time battery SOC and filter temperature conditions, providing adaptable deceleration performance across different operating states
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
Ensures deceleration through regeneration while preventing filter overheating by managing power consumption and engine operation to maintain fuel availability.
Implementation Method 1
the generator is driven by the engine to generate power
Implementation Method 2
the drive motor is driven with the power generated by the generator
Implementation Method 3
an engine in which a filter for removing particulate matter is attached to an exhaust system
Implementation Method 4
a filter for removing particulate matter is attached to an exhaust system
Data Source
AI summary
A vehicle includes an engine, a generator, a drive motor, and a filter that collects particulate matter in exhaust gas of the engine, in which the generator is driven by the engine to generate power, and the drive motor is driven with the power generated by the generator. A method for controlling the vehicle includes performing motoring by driving the engine in an operation stop state with the generator, thereby performing fuel cut of the engine and consuming power; prohibiting fuel cut of the engine based on a temperature of the filter; when a discharge request is made while the fuel cut of the engine is prohibited, performing a power consumption operation in which a negative ENG torque is generated in the engine by driving the engine with the generator while performing combustion in the engine; and detecting, based on a torque of the generator, that fuel injection is not performed in the engine while the fuel cut of the engine is prohibited, and stopping the generator when it is detected that the fuel injection is not performed in the engine.