Hybrid Vehicle Energy Storage Control via Dynamic Threshold Segmentation
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Solution Overview
Problem
Existing control methods for hybrid vehicle energy storers do not effectively manage energy distribution, particularly during low-speed driving and stationary phases, leading to inefficient engine starts and energy consumption.
Innovation Solution
A method involving forced charging of the electric storer when the vehicle is in motion and the state of charge is below a threshold, with a 'plug zone' reserved for accessories during engine stops, and prioritizing internal combustion engine recharging when kinetic energy recovery is limited, along with hysteresis to avoid untimely starts/stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If forced charging is activated when state of charge is below threshold, then energy availability for traction is improved, but engine starts increase during stationary phases
Solution Approach 1:
The control method segments the state of charge management into two distinct zones: a first zone (below first threshold) ensuring minimum energy for start-stop operation, and a second zone (above first threshold) optimizing energy consumption. This segmentation allows the system to prioritize different objectives in different operating conditions, preventing unnecessary engine starts while maintaining adequate energy levels for traction when needed.
Solution Approach 2:
The system dynamically changes the threshold parameter for forced charging activation based on vehicle speed and operating conditions. At non-zero speed, forced charging activates at a lower threshold, while at zero speed, it requires a higher threshold. This parameter adaptation prevents energy waste during stationary phases while ensuring energy availability during motion, directly resolving the contradiction between energy availability and engine starting consumption.
2Quantity of substance
If engine is started to recharge storer at low speed, then energy reserve is improved, but vehicle comfort deteriorates due to frequent starts
Solution Approach 1:
The control strategy dynamically adapts the forced charging threshold based on vehicle speed. At non-zero speed, the system activates forced charging at a lower state of charge threshold, while at zero speed, it requires a higher threshold before activation. This dynamic adjustment prevents unnecessary engine starts during stationary phases, thereby maintaining vehicle comfort while still ensuring adequate energy reserves are maintained during motion when charging is actually needed.
3Reliability
If forced charging threshold is lowered to ensure start-stop performance, then reliability is improved, but energy consumption increases
Solution Approach 1:
The control method segments state of charge management into two distinct zones with different objectives: a first zone (below first threshold) ensuring minimum energy for reliable start-stop operation, and a second zone (above first threshold) optimizing energy consumption. This segmentation allows the system to guarantee start-stop performance by maintaining adequate energy reserves in the first zone, while avoiding unnecessary engine starts and energy consumption in the second zone during stationary phases.
Solution Approach 2:
The system dynamically changes the forced charging activation threshold based on vehicle operating conditions. At non-zero speed, forced charging activates at a lower threshold to ensure energy availability, while at zero speed, it requires a higher threshold to avoid unnecessary engine starts. This parameter adaptation ensures reliable start-stop performance when needed while minimizing overall energy consumption during stationary phases, directly resolving the contradiction between reliability and energy consumption.
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 optimizes energy management by ensuring start-stop performance at low state of charge, minimizing engine starts, and reducing consumption, while maintaining vehicle comfort by strategically controlling engine operation.
Implementation Method 1
which comprises an electric storer and an electric machine
Implementation Method 2
the internal combustion engine is started or kept started so as to recharge the zone as a priority
Implementation Method 3
an electric machine which then operates in engine mode to reinforce or replace the torque of the internal combustion engine
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The method involves forcibly charging an energy storage (11), and operating a heat engine when a vehicle is at non null speed and a charge state of the storage is less than a threshold. The forcible charging of the storage is stopped, and the heat engine is stopped when the charge state of the storage is greater than the threshold, where the threshold is fixed to a minimal energy value that permits starting of the vehicle. An independent claim is also included for an energy storage control device for a hybrid vehicle.