Hybrid Vehicle Auxiliary Load Compensation via Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for hybrid vehicles fail to efficiently compensate for mechanical and electrical auxiliary loads, leading to degraded power performance and reduced system efficiency, as they do not differentiate between the types of auxiliary loads and simply increase engine torque without considering the hybrid system's efficiency.
Innovation Solution
A method that divides auxiliary loads into mechanical and electrical loads, allowing for targeted compensation by adjusting engine and motor power control values and battery charge/discharge limits, thereby maintaining optimal engine operation and improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If auxiliary loads are compensated by simply increasing engine torque, then power performance is improved, but system efficiency deteriorates
Solution Approach 1:
The patent segments auxiliary loads into two distinct categories: mechanical auxiliary loads (P_mech) and electrical auxiliary loads (P_elec). This segmentation allows for differentiated compensation strategies - mechanical loads are compensated by adjusting engine torque, while electrical loads are compensated by adjusting battery charge/discharge limits. This resolves the contradiction by preventing unnecessary engine torque increases for electrical loads, thereby maintaining system efficiency while still providing adequate power performance.
2Power
If engine torque is increased to compensate for all auxiliary loads, then power performance is improved, but engine operation point deviates from optimal efficiency point
Solution Approach 1:
The patent separates auxiliary load compensation into distinct pathways: mechanical auxiliary loads are compensated through engine torque adjustment, while electrical auxiliary loads are compensated through battery charge/discharge limit adjustment. This ensures that engine torque is only increased when necessary for mechanical loads, allowing the engine to maintain operation near its optimal efficiency point while still providing adequate power performance.
Solution Approach 2:
The patent dynamically adjusts different parameters based on the type of auxiliary load: engine torque (T_aux) is adjusted for mechanical loads, while battery charge/discharge limits (P_bat_charge, P_bat_discharge) are adjusted for electrical loads. This parameter differentiation allows the system to compensate for auxiliary loads while maintaining optimal engine operation conditions.
Data Source
AI summary
The present invention provides a method of compensating for auxiliary loads of a hybrid vehicle, which divides the auxiliary loads into a mechanical auxiliary load and an electrical auxiliary load and performs an appropriate auxiliary load compensation according to the kind of auxiliary loads, thus improving system efficiency as well as power performance of the vehicle.