Engine Idle Heating Control for Battery Overcharge Prevention
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Solution Overview
Problem
Existing methods for heating a vehicle's passenger compartment using a battery-powered thermistor are slow, and starting the engine to enhance heating can overcharge the battery, potentially damaging it.
Innovation Solution
A control method that starts the engine based on a heating request, idles the engine when the battery is fully charged to generate heat without charging, and adjusts generator power based on battery state to ensure safety and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the engine is started to heat the passenger compartment, then the heating speed is improved, but the battery may be overcharged and damaged
Solution Approach 1:
The system dynamically adjusts the engine's working state based on real-time battery state of charge (SOC) and charging power. When battery SOC is high and charging power exceeds threshold, the engine transitions to idle state without driving the generator, preventing overcharge while maintaining heating function. This dynamic control resolves the contradiction between heating speed and battery safety.
Solution Approach 2:
The control method changes the engine operating parameters based on battery status. By monitoring battery SOC and charging power, the system adjusts engine output power and generator loading conditions. This parameter adjustment allows the engine to provide heat without overcharging the battery, solving the contradiction between heating efficiency and battery protection.
2Reliability
If the engine is controlled to idle to prevent battery overcharge, then battery safety is ensured, but heating efficiency may be reduced
Solution Approach 1:
The engine continues to operate in idle state continuously, maintaining heating function without interruption. Although the engine doesn't drive the generator to charge the battery, it still produces heat that can be used for passenger compartment heating. This continuous useful action ensures battery safety while maintaining adequate heating efficiency.
Solution Approach 2:
The engine's idle operation naturally produces heat as a byproduct, which serves the heating function without requiring additional energy input. The system utilizes the engine's own operational characteristics to provide both power generation control and heating, achieving self-service that resolves the contradiction between battery protection and heating efficiency.
3Reliability
If the generator is controlled to not generate power during engine idle, then battery overcharge is prevented, but energy utilization is reduced
Solution Approach 1:
The system extracts only the necessary function (heating) from the engine-genera tor system while separating out the power generation function. When battery SOC is high, the generator is decoupled from the engine, preventing power flow to the battery. This extraction of the heating function while removing the charging function prevents overcharge while maintaining energy utilization for heating purposes.
Solution Approach 2:
The engine performs partial action by operating in idle state without driving the generator. This partial operation is sufficient to produce the necessary heat for the passenger compartment without the excessive action of full power generation. The controlled partial action prevents battery overcharge while maintaining adequate energy utilization for heating.
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 battery safety while increasing heating speed and reducing noise, improving passenger compartment comfort and vehicle stability.
Implementation Method 1
heating the passenger compartment by using heat generated when the engine works
Implementation Method 2
the engine drives the generator to generate power
Data Source
AI summary
A control method and a control apparatus ensure both battery safety and a heating speed of a passenger compartment by obtaining a heating request for a passenger compartment of a vehicle; starting an engine of the vehicle based on the heating request; heating the passenger compartment by using heat generated by the engine; and if a state of charge of a battery of the vehicle is greater than or equal to a preset state of charge, and a charging power of the battery is greater than or equal to a preset charging power, controlling the engine to idle and controlling a generator to be in a state of not generating power.