Vehicle Control System Intermittent Engine Stop for External Power Supply
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Solution Overview
Problem
When electric power is supplied to a device outside a hybrid vehicle, the engine's combustion efficiency and fuel economy performance decrease due to prohibited intermittent stop operations, as the engine temperature is hard to rise, leading to decreased fuel economy.
Innovation Solution
A control system for a vehicle that includes an engine, electrical storage unit, and generator, with a controller that sets specific temperature thresholds to allow intermittent engine stops when electric power is supplied to external devices, narrowing the range for intermittent stop permission when power is supplied to improve engine temperature and fuel economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If intermittent stop operation is prohibited when electric power is supplied to external devices, then the engine can maintain continuous operation and meet power demand, but the engine temperature is hard to rise and fuel economy performance decreases
Solution Approach 1:
The controller changes the temperature threshold parameter for permitting intermittent stop operations based on the operating mode. When electric power is being supplied to external devices, a higher temperature threshold is required compared to normal traveling conditions. This parameter adjustment allows the system to maintain engine warmth and combustion efficiency while still permitting intermittent stops to improve fuel economy.
2Power
If the engine is operated at set low speed during power supply to external devices, then power can be supplied to the device, but the engine temperature is hard to rise and combustion efficiency decreases
Solution Approach 1:
The system dynamically adjusts the engine operating speed based on the coolant temperature and power supply status. When the engine is running at low speed for external power supply and the coolant temperature is below the threshold, the controller increases the engine speed to a higher level. This dynamic adjustment ensures the engine reaches adequate operating temperature while still being able to supply required electric power.
3Device complexity
If intermittent stop permission condition uses the same temperature threshold for both traveling and power supply modes, then the control logic is simple, but fuel economy performance deteriorates during power supply operations
Solution Approach 1:
The controller distinguishes between traveling mode and power supply mode by detecting the operational state, and applies different coolant temperature thresholds for intermittent stop permission in each mode. This parameter differentiation adds minimal control complexity while significantly improving fuel economy performance during power supply operations by allowing intermittent stops when appropriately warm.
Data Source
AI summary
A control system for a vehicle including an engine, an electrical storage unit and a generator driven by the engine, the control system includes a socket and a controller. The socket is configured to supply electric power from the generator or the electrical storage unit to a device outside the vehicle in a travel stop state. The controller stops the engine when a preset condition is satisfied. The controller sets a first range and a second range in which the condition is satisfied. The first range is the range in a case where electric power is supplied to the device outside the vehicle and the second range is the range in another case. The first range is narrower than the second range.