Vehicle Torque Control via Kinetic Model Feedback
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Solution Overview
Problem
Conventional engine torque control methods fail to accurately achieve the intended torque due to errors in adaptation maps and unconsidered disturbances, leading to deviations in actual torque output and suboptimal vehicle behavior.
Innovation Solution
A moving machine control program and device that acquires requested external force, uses a reference kinetic model to calculate desired behavior, measures actual behavior, corrects the force to match the desired behavior, and controls actuators accordingly, improving measurement accuracy and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional map-based torque control is used, then the control system is simple and cost-effective, but the actual torque deviates from requested torque due to adaptation errors and unconsidered disturbances
Solution Approach 1:
The patent implements feedback control by continuously measuring actual vehicle behavior (acceleration, speed) and comparing it with requested behavior. The control system calculates correction amounts based on the deviation between actual and requested behavior, then adjusts the actuator commands accordingly. This closed-loop feedback mechanism ensures accurate torque delivery despite map adaptation errors and disturbances.
Solution Approach 2:
The patent replaces the conventional map-based mechanical control approach with a model-based control system. Instead of relying on pre-defined torque maps, the system uses a vehicle behavior model to calculate requested behavior and a feedback mechanism to determine correction amounts. This substitution enables more accurate torque control while maintaining cost-effectiveness through software-based solutions.
2Measurement precision
If map-based torque control with correction is used, then torque accuracy improves, but the computational complexity and processing time increase
Solution Approach 1:
The patent performs preliminary calculations by pre-establishing the vehicle behavior model and its parameters. The model contains pre-calculated relationships between actuator inputs and vehicle behavior responses. During real-time control, the system only needs to evaluate the model with current inputs and compute simple correction amounts based on measured deviations, rather than performing complex iterative optimizations.
Solution Approach 2:
The patent changes the control parameters from direct torque commands to behavior-based correction amounts. By controlling the deviation between actual and requested behavior rather than directly managing torque values, the system simplifies the control calculations. The correction amounts are derived from straightforward measurements of acceleration and speed deviations, enabling rapid computation with minimal processing time.
Data Source
AI summary
A moving machine control program causes a computer to execute: acquiring requested external force regarding an actuator; reading out a reference kinetic model that defines moving machine behavior exhibited when the actuator generates external force corresponding to the requested external force; calculating, as requested moving machine behavior, the moving machine behavior exhibited when the actuator generates the external force corresponding to the requested external force, in accordance with the reference kinetic model; measuring actual moving machine behavior during traveling of the moving machine; correcting the requested external force such that the actual moving machine behavior measured in the measuring step approaches the requested moving machine behavior calculated in the calculating step; and controlling the actuator based on the corrected requested external force.