Hybrid Vehicle Control System ECVT Power Management
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Solution Overview
Problem
Conventional hybrid electrical vehicles have limitations in power performance, driving comfort, and efficiency due to their simplex driving mode, frequent engine start-stop, high fuel consumption, and complex series-parallel power system structure, which restricts the selection of driving modes based on user habits and conditions.
Innovation Solution
A control system and method for a hybrid electrical vehicle that allows operation in hybrid-electrical economical and sport modes by connecting the engine power subsystem and motor power subsystem in parallel, enabling flexible power management based on battery state and slope conditions, reducing engine participation in urban driving, and optimizing energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conventional hybrid electrical vehicle adopts a series-parallel hybrid power system with mechanical gear shifting mechanisms, then the rotating speed relationship between the internal combustion engine system and the electric motor drive system can be adjusted, but the device complexity increases and the cost is high
Solution Approach 1:
The patent replaces the mechanical gear shifting mechanism with an electronic continuous variable transmission (ECVT) system. The ECVT uses electronic control to adjust the rotating speed relationship between the engine and electric motor, eliminating the need for complex mechanical gears while achieving the same functional goal of speed ratio adjustment.
Solution Approach 2:
The patent integrates the functions of the mechanical gear shifting mechanism and the electric motor control into a unified ECVT system. This single system performs both the speed ratio adjustment and the power distribution functions, reducing overall device complexity while maintaining versatility.
2Use of energy by moving object
If the conventional hybrid electrical vehicle uses the engine to charge the battery via the first electric motor MG1, then the engine can provide electric energy, but the driving efficiency of the engine is reduced
Solution Approach 1:
The patent implements dynamic control of the power flow based on real-time driving conditions. The system dynamically determines whether the engine should charge the battery or directly drive the vehicle, optimizing the engine's operating point to maintain high efficiency while still providing electric energy when needed.
Solution Approach 2:
The patent changes the operating parameters of the engine and electric motors based on driving conditions. By adjusting the engine speed, torque, and power distribution ratios, the system optimizes the engine's efficiency while maintaining the ability to charge the battery when appropriate.
3Extent of automation
If the predetermined demanded power and speed threshold are set low and the speed switching condition is set as a point, then the engine stop-start strategy can be implemented, but the engine starts prematurely and frequently
Solution Approach 1:
The patent optimizes the threshold parameters for engine stop-start decisions by changing them from fixed low values to dynamically adjusted values based on driving conditions. This prevents premature engine starts while maintaining the automated stop-start functionality for fuel savings.
Solution Approach 2:
The patent implements a feedback mechanism that continuously monitors driving conditions and adjusts the engine stop-start strategy accordingly. The system uses feedback from sensors to determine the optimal moment to start or stop the engine, preventing unnecessary starts while maintaining fuel efficiency.
4Power
If the electric motor and engine with high power and high torque are selected, then the power performance improves, but the cost increases
Solution Approach 1:
The patent applies partial power from the engine and partial power from the electric motor based on driving conditions, rather than always using maximum power from both sources. This approach achieves the necessary power performance while reducing the overall system complexity and cost requirements.
Solution Approach 2:
The patent merges the power output of the engine and electric motor through the ECVT system to achieve high power performance. By combining the two power sources strategically, the system achieves high torque and power when needed without requiring either component to be oversized, thus reducing complexity and cost.
Data Source
AI summary
A control system of a hybrid electrical vehicle includes: a transmission device; an engine power subsystem and a motor power subsystem connected with the transmission device; and a control module configured to control the hybrid electrical vehicle to operate in a hybrid electrical-economical mode by controlling the engine power subsystem and the motor power subsystem, and to control the hybrid electrical vehicle to operate in a first manner if a current slope detected by the hybrid electrical vehicle is less than or equal to a minimum slope and a current electric quantity of a power battery of the motor power subsystem is less than or equal to a first electric quantity threshold, or if the current slope is less than or equal to the minimum slope and a maximum allowable discharge power of the power battery is less than or equal to a first power threshold.