Engine Controller Torque Prediction for Alternator Load
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Solution Overview
Problem
Existing engine control systems experience responsiveness delays when increasing torque for components like alternators and compressors, leading to temporary drops in vehicle torque and engine speed, which deteriorate drivability and hinder electricity generation.
Innovation Solution
A controller system that calculates and adjusts engine torque by considering the responsiveness delay, using a component-drive-torque calculating means, engine control means, and component control means to synchronize torque variations and maintain stable engine speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the alternator intensively generates electricity in a short period, then electricity generation is improved, but the engine torque is rapidly increased causing responsiveness delay and temporary drop in vehicle torque and engine speed
Solution Approach 1:
The controller predicts future component drive torque requirements and performs preliminary engine torque adjustments before the actual torque demand occurs. By calculating predicted component drive torque based on component rotation speed and anticipated load changes, the system proactively adjusts engine torque to prevent speed fluctuations, ensuring smooth power delivery while maintaining high electricity generation capacity.
2Adaptability or versatility
If the compressor is started to provide air-conditioning function, then cooling performance is improved, but the engine speed is temporarily dropped off
Solution Approach 1:
When air-conditioning is activated, the controller predicts the compressor drive torque requirement based on the compressor rotation speed and anticipated cooling load. The engine control means performs preliminary torque adjustment to compensate for the upcoming compressor load, preventing engine speed drops and maintaining stable vehicle operation while providing effective air-conditioning.
3Power
If the engine torque is controlled based on throttle position and fuel injection quantity, then engine power output is improved, but responsiveness delay occurs causing belated torque increase
Solution Approach 1:
The controller calculates predicted component drive torque in advance based on component rotation speed and anticipated load changes. By performing preliminary engine torque adjustment before the actual torque demand occurs, the system eliminates responsiveness delay inherent in traditional throttle and fuel injection control, ensuring immediate torque delivery while maintaining high engine power output.
Solution Approach 2:
The system dynamically adjusts the timing and magnitude of engine torque changes based on real-time component rotation speed and predicted load requirements. This dynamic control approach optimizes the balance between throttle position and fuel injection quantity, enabling rapid torque response without sacrificing engine power output or efficiency.
Data Source
AI summary
A required-generate-current (RGC) is calculated according to conditions of the electric loads and a charging state of the battery. The required-alternator-drive-torque (RADT) is estimated according to the required-generate-current (RGC). A required engine torque is calculated by adding the required-alternator-drive-torque (RADT) and the required-vehicle-drive-torque (RVDT) together. The engine torque which is realized at next calculating timing is estimated in consideration of a response delay of the engine. The differential torque between the estimated engine torque and the required-vehicle-drive-torque (RVDT) is calculated as the permission torque. The command current corresponding to the permission torque is calculated. The control current of the alternator is controlled in such a manner as to generate current corresponding to the command current at the next calculating timing.