Hybrid Vehicle Drive Control for Engine Start-Stop Frequency Reduction
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Solution Overview
Problem
Traditional start-stop systems in hybrid electric vehicles lead to reduced engine service life due to frequent start-stops, increased fuel consumption, and poor ride comfort, as they are limited by conditions such as vehicle speed, battery charge, and road slope, necessitating a more efficient control method.
Innovation Solution
A drive control method and device for hybrid electric vehicles that enter a small load stop mode based on preset requirements of gear position, electric charge level, and road slope, allowing for energy recovery through motor feedback and reducing starter frequency, thereby extending component life and improving ride comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional start-stop systems are used to reduce fuel consumption and emissions, then fuel economy is improved, but engine service life is reduced due to frequent start-stops
Solution Approach 1:
The system changes the control parameters for engine start-stop operations by introducing speed thresholds and load conditions. Instead of stopping the engine at any idle condition, the system evaluates multiple parameters including vehicle speed, accelerator position, and battery charge level to determine whether to stop or maintain engine operation, thereby reducing unnecessary start-stop cycles
Solution Approach 2:
The system dynamically adjusts start-stop control based on real-time operating conditions. The control device continuously monitors vehicle speed, accelerator position, battery state, and other parameters to make adaptive decisions about engine stopping and starting, making the system flexible rather than fixed
2Use of energy by moving object
If traditional start-stop systems are used to reduce fuel consumption, then fuel economy is improved, but ride comfort deteriorates due to frequent start-stops and vibrations
Solution Approach 1:
The system introduces speed thresholds (first and second speed thresholds) and load conditions as additional control parameters. By evaluating these parameters before initiating start-stop operations, the system avoids stopping the engine during conditions that would cause discomfort, such as when the vehicle is moving or under load
Solution Approach 2:
The control device continuously monitors vehicle operating conditions including speed, accelerator position, and battery state to provide feedback on whether start-stop operations should be executed. This feedback mechanism prevents start-stop operations during conditions that would degrade ride comfort
3Use of energy by moving object
If traditional start-stop systems are used, then fuel consumption is reduced, but system complexity increases due to multiple control conditions and components
Solution Approach 1:
The control device integrates multiple control functions into a single system that manages engine start-stop operations based on comprehensive evaluation of various parameters. Rather than requiring separate control systems for different conditions, one control device handles all decision-making regarding engine stopping and starting
Solution Approach 2:
The system combines start-stop control with existing vehicle management systems by integrating control logic that considers battery charge level, vehicle speed, and other parameters already monitored by the vehicle's electronic control architecture, rather than adding completely separate control systems
4Object-generated harmful factors
If traditional start-stop systems are used, then emissions are reduced, but productivity decreases due to limited operating conditions
Solution Approach 1:
The system dynamically determines whether to stop or maintain engine operation based on real-time evaluation of multiple parameters including vehicle speed, accelerator position, battery charge level, and road slope. This dynamic control allows the engine to be stopped during appropriate conditions while maintaining operation during conditions that would hinder vehicle performance or progress
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
This approach increases driving distance, improves economy performance, reduces fuel consumption and emissions, and mitigates the issues of frequent engine start-stops, enhancing both ride comfort and power performance.
Implementation Method 1
If the hybrid electric vehicle has an accelerator-releasing energy feedback function, wasted kinetic energy may be converted to electric energy by a motor through the energy feedback and stored in a power battery
Data Source
AI summary
The present disclosure provides a drive control method, a drive control device of a hybrid electric vehicle and a hybrid electric vehicle. The drive control method includes: obtaining a current gear position of the hybrid electric vehicle, a current electric charge level of a power battery and a slope of a road on which the hybrid electric vehicle is driving; obtaining a current speed of the hybrid electric vehicle if the current gear position of the hybrid vehicle, the current electric charge level of the power battery, and the slope of the road on which the hybrid electric vehicle is driving meet a preset requirement; and causing the hybrid electric vehicle to enter a small load stop mode if the current speed is greater than or equal to a first speed threshold, and less than a second speed threshold.