Motor Controller Torque Compensation for Unequal Interval Engine
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Solution Overview
Problem
Engines configured to expand at unequal intervals experience torque fluctuations, leading to decreased torque in expansion pause intervals and insufficient torque during compression strokes, resulting in rotational fluctuations and poor driving feeling.
Innovation Solution
A motor controller is used to add torque to the engine's torque, maintaining a positive value and stabilizing torque application to the drive wheel, even during compression strokes and expansion pause intervals, thereby reducing rotational fluctuations and improving driving feeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expansion strokes are arranged at unequal intervals to improve traction performance, then traction performance is improved, but torque fluctuation increases causing poor driving feeling
Solution Approach 1:
A motor is introduced as an intermediary device between the engine and drive wheel. The motor compensates for torque fluctuations generated by the unequal interval expansion stroke engine, maintaining stable torque delivery to the drive wheel while preserving the traction benefits of unequal interval expansion.
Solution Approach 2:
The system dynamically adjusts motor torque output based on real-time detection of engine torque characteristics and drive wheel slip conditions. By varying motor torque parameters in response to changing operating conditions, the system maintains optimal traction while smoothing rotational fluctuations.
2Stability of the object's composition
If flywheel mass is increased to reduce rotational fluctuation, then rotational fluctuation is reduced, but driving power performance degrades
Solution Approach 1:
The mechanical solution of increasing flywheel mass is replaced with an electro-mechanical system. The motor provides active torque compensation through electrical control, achieving rotational stability without the inertial constraints and power loss associated with a larger flywheel.
3Stability of the object's composition
If motor torque is added during compression stroke to maintain positive torque, then driving feeling is improved, but electric power consumption increases
Solution Approach 1:
The motor controller continuously monitors engine torque output and drive wheel slip conditions, adjusting motor torque application in real-time. This feedback control ensures motor torque is applied only when necessary to maintain positive torque during compression stroke, minimizing unnecessary energy consumption while preserving torque stability.
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
The solution effectively inhibits rotational fluctuations and maintains high traction performance, enhancing driving feeling and energy efficiency by ensuring positive torque application and reducing electric power consumption.
Implementation Method 1
a motor configured to generate a torque applied to a driving power transmission system including a crankshaft of the engine
Data Source
AI summary
A motorcycle includes an engine in which angle intervals of crank angles respectively corresponding to expansion strokes of a plurality of cylinders are unequal, a motor configured to generate a torque applied to a driving power transmission system including a crankshaft of the engine, and a motor controller configured to drive the motor to add the torque of the motor to a torque of the engine.