Hybrid Vehicle Engine Control via Power Switching and Mode Adaptation
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Solution Overview
Problem
Hybrid vehicles face complex and inefficient power transmission systems, leading to high energy consumption and reduced transmission efficiency, along with complicated control strategies, particularly in managing gear shift actuating components during mode switching.
Innovation Solution
A method for controlling an engine unit in a hybrid vehicle that involves acquiring operating parameters and modes to start or stop the engine, utilizing a power switching device to manage power transmission between the engine unit, motor generators, and wheels, thereby reducing energy consumption and extending starter motor life, while enhancing fuel efficiency and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plurality of gear shift actuating components are controlled simultaneously during gear shifting or mode switching, then the power transmission system can achieve mode switching capability, but the control strategy becomes complicated and the structure becomes complex
Solution Approach 1:
The patent introduces a control device as an intermediary that centrally manages the coordination of multiple gear shift actuating components. This control device receives signals from various sensors (accelerator pedal operation amount sensor, vehicle speed sensor, SOC sensor) and processes them to generate appropriate control signals for the actuating components, thereby simplifying the overall control strategy while maintaining mode switching capability.
2Use of energy by moving object
If the engine unit is frequently started and stopped to reduce energy consumption, then fuel efficiency improves, but the starter motor service life decreases
Solution Approach 1:
The control device performs preliminary assessment of operating conditions by acquiring signals from the accelerator pedal operation amount sensor, vehicle speed sensor, and SOC sensor before deciding whether to start or stop the engine. This preliminary action allows the system to avoid unnecessary engine starts, thereby reducing starter motor usage while still achieving energy savings when appropriate.
3Use of energy by moving object
If the power transmission system is designed with multiple components for improved fuel economy, then fuel economic efficiency increases, but the system becomes bulky and transmission efficiency decreases
Solution Approach 1:
The patent designs the power transmission system with multi-functional components that can operate in different modes. The first motor generator and second motor generator can function in multiple roles depending on operating conditions, allowing the system to achieve good fuel economy across various scenarios without requiring separate dedicated components for each function, thereby avoiding excessive bulk and minimizing transmission losses.
Data Source
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AI summary
The present invention provides a method for controlling an engine unit in a vehicle. The vehicle includes an engine unit, a transmission unit adapted to selectively couple with the engine unit and also configurd to transmit the power generated by the engine unit, a first motor generator coupled with the transmission unit, an output unit, a power switching device, a second motor generator configured to drive at least one of front and rear wheels, and a power battery that is respectively connected to the first motor generator and the second motor generator. The method includes: acquiring an operating mode of a vehicle and an operating parameter of the vehicle; and controlling an engine unit according to an operating parameter and an operating mode to start or stop.