Series Hybrid Vehicle Deceleration Under DPF Fuel-Cut Limits
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Solution Overview
Problem
In series hybrid vehicles, deceleration cannot be secured by regenerative means when fuel cut is prohibited to prevent overheating of the particulate filter, leading to uncomfortable unintended changes in deceleration.
Innovation Solution
Perform a power consumption operation by driving the engine with the generator while stopping fuel supply, generating negative engine torque through combustion to ensure deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fuel cut is prohibited to suppress overheating of the filter, then the filter temperature is controlled, but deceleration cannot be secured by regenerative means
Solution Approach 1:
The invention changes the engine operation parameters by performing combustion at negative torque conditions. Instead of simply prohibiting fuel cut or performing full motoring, the system adjusts the engine torque parameter to negative values while maintaining combustion, creating a new operational state that consumes power without causing filter overheating while still enabling regenerative deceleration
Solution Approach 2:
The invention dynamically adjusts engine operation based on real-time conditions. The control system monitors battery charge state, vehicle speed, and filter temperature to dynamically determine when to perform negative torque combustion, transitioning between different operational modes (motoring, idle stop, negative torque combustion) to optimize both filter protection and deceleration capability
2Use of energy by moving object
If motoring is performed to increase room for regeneration, then power consumption increases and room for regeneration is created, but filter overheating occurs
Solution Approach 1:
The invention modifies the engine operation parameters by performing combustion at negative torque conditions. Instead of simply prohibiting fuel cut or performing full motoring, the system adjusts the engine torque parameter to negative values while maintaining combustion, creating a new operational state that consumes power without causing filter overheating while still enabling regenerative deceleration
Solution Approach 2:
The invention applies partial action by performing combustion at reduced intensity compared to full motoring. The negative torque combustion consumes enough power to create regeneration capacity but at a lower intensity than full motoring, thereby avoiding excessive heat generation in the filter while still achieving the desired power consumption effect
3Reliability
If regenerative deceleration is performed while fuel cut is prohibited, then filter protection is maintained, but deceleration performance is compromised
Solution Approach 1:
The invention changes the engine operation parameters by performing combustion at negative torque conditions. Instead of simply prohibiting fuel cut or performing full motoring, the system adjusts the engine torque parameter to negative values while maintaining combustion, creating a new operational state that consumes power without causing filter overheating while still enabling regenerative deceleration
Solution Approach 2:
The negative torque combustion acts as an intermediary solution between full motoring and idle stop. This intermediate operational state provides a middle ground that consumes sufficient power to enable regenerative deceleration while generating less heat than full motoring, thus protecting the filter while maintaining deceleration performance
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
This method ensures deceleration by regeneration even when fuel cut is prohibited, preventing overheating of the filter and maintaining vehicle control.
Implementation Method 1
performing a power consumption operation in which a negative engine torque is generated in the engine by driving the engine with the generator while performing combustion in the engine
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. The generator is driven by the engine to generate power. 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; and when a discharge request is made while the fuel cut of the engine is prohibited, performing a power consumption operation in which a negative engine torque is generated in the engine by driving the engine with the generator while performing combustion in the engine.