Hybrid Vehicle Start-Stop Control via Speed and Charge Intervals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional start-stop systems in hybrid electric vehicles lead to reduced engine service life due to frequent start-stops, increased noise, and vibration, while also being limited in functionality and increasing vehicle costs.
Innovation Solution
A drive control method and device that determines whether the vehicle is within a speed start-stop interval based on gear position and electric charge level, adjusting the engine and motor states according to road slope and speed to optimize power output and reduce unnecessary engine starts, thereby extending component life and improving fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional start-stop systems are used to reduce fuel waste and air pollution from engine idling, then fuel efficiency is improved, but engine service life is reduced due to frequent start-stops
Solution Approach 1:
The system changes the control parameters of the start-stop function by introducing speed start-stop interval based on vehicle speed and accelerator pedal position. The ECU determines whether to enable start-stop mode by evaluating multiple parameters including vehicle speed range, accelerator pedal opening degree, and brake pedal state, thereby optimizing the balance between fuel efficiency and engine durability
Solution Approach 2:
The system dynamically adjusts the start-stop control strategy based on real-time driving conditions. The ECU continuously monitors vehicle speed, accelerator pedal position, and other parameters to dynamically enable or disable the start-stop function, making the system adaptive to different driving scenarios rather than using a fixed control strategy
2Use of energy by moving object
If automatic start-stop systems are implemented to reduce engine idling, then fuel consumption is reduced, but vibration and noise increase due to frequent engine starts
Solution Approach 1:
The system modifies the operational parameters by defining specific speed ranges and accelerator pedal position thresholds that determine when start-stop mode should be active. By changing these control parameters based on driving conditions, the system reduces unnecessary engine starts that would generate vibration and noise while maintaining fuel efficiency benefits during appropriate conditions
3Use of energy by moving object
If start-stop systems are enhanced with multiple control conditions, then fuel efficiency is improved, but device complexity increases
Solution Approach 1:
The ECU integrates multiple control functions into a single control unit that handles both traditional start-stop control and speed start-stop control. The system uses existing sensors (accelerator pedal position sensor, brake pedal position sensor, vehicle speed sensor) and the existing ECU to implement the enhanced control logic, avoiding the need for separate dedicated control devices and reducing overall system complexity
4Use of energy by moving object
If traditional start-stop control is used at vehicle speed 0, then idle fuel waste is reduced, but adaptability is limited to stationary conditions only
Solution Approach 1:
The system transitions from a static start-stop control strategy (only at vehicle speed 0) to a dynamic strategy that adapts to different vehicle speeds and driving conditions. The ECU evaluates real-time parameters including vehicle speed, accelerator pedal position, and brake pedal state to dynamically determine appropriate start-stop control actions, significantly expanding the system's adaptability
Solution Approach 2:
The system changes the operational parameters by extending the applicable conditions from stationary (speed 0) to moving conditions (specific speed ranges). By defining speed start-stop intervals and incorporating accelerator pedal position thresholds, the system enables start-stop control during vehicle operation, transforming the control strategy from position-fixed to parameter-variable
Data Source
AI summary
The present disclosure provides a hybrid electric vehicle, a drive control method and a drive control device of a hybrid electric vehicle. The drive control method includes: obtaining a current gear position of the hybrid electric vehicle and a current electric charge level of a power battery; determining whether the vehicle is within a speed start-stop interval according to the current gear position of the hybrid electric vehicle and the current electric charge level of the power battery; obtaining a slope of a road on which the vehicle is driving and a current speed of the hybrid electric vehicle, if the vehicle is within a speed start-stop interval; and controlling a working state of an engine and/or a motor of the hybrid electric vehicle according to the slope of the road on which the vehicle is driving and the current speed of the vehicle.