Motorized Vehicle Motor Control via Battery Current Feedback
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Solution Overview
Problem
Current motorized vehicle control systems fail to efficiently manage power consumption, particularly due to battery losses and inefficiencies in motor operation, which are not adequately addressed by existing methods that alternate between motor driving and coasting periods.
Innovation Solution
An apparatus that includes a machine operating point setter and a rotary electric machine controller, which sets and controls operating points for a rotary electric machine based on current flow through the rechargeable battery, optimizing system efficiency by considering rotational speed, torque, and motor efficiency maps to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the motor is driven continuously with low efficiency torque, then the travel requirements are satisfied, but the power consumption increases
Solution Approach 1:
The patent applies periodic action by alternating between motor driving periods and coasting periods. During motor driving periods, the motor operates at high efficiency points to reduce energy consumption. During coasting periods, the motor is stopped and the vehicle coasts using momentum. This periodic alternation satisfies travel requirements while significantly reducing overall power consumption compared to continuous motor operation.
2Use of energy by moving object
If the motor is driven intermittently with high efficiency torque, then the power consumption is reduced, but the system does not account for battery losses
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting motor operating parameters (torque and rotational speed) based on battery state of charge and current flow conditions. The control system selects optimal operating points from efficiency maps that account for battery losses, changing motor parameters in real-time to minimize total system energy consumption including battery inefficiencies.
3Loss of energy
If the motor operating points are not optimized based on current flow, then the control system is simple, but the system efficiency is not maximized
Solution Approach 1:
The patent applies feedback by continuously monitoring battery current flow and state of charge, then using this information to select optimal motor operating points from pre-calculated efficiency maps. The control system receives feedback on battery conditions and adjusts motor parameters accordingly, maximizing system efficiency while maintaining manageable control complexity through the use of pre-computed operating point maps.
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 effectively reduces power consumption by optimizing motor operation, taking into account battery losses and system efficiency, thereby improving electricity economy and reducing overall power usage in motorized vehicles.
Implementation Method 1
a rechargeable battery, a rotary electric machine electrically connected to the rechargeable battery
Implementation Method 2
a rotary electric machine electrically connected to the rechargeable battery
Data Source
AI summary
In an apparatus for controlling a motorized vehicle equipped with a rechargeable battery, a rotary electric machine electrically connected to the rechargeable battery, and electrical loads electrically connected to the rechargeable battery, a machine operating point setter is configured to, when current is passing between the rechargeable battery and the rotary electric machine, set operating points of the rotary electric machine, each specifying a system efficiency representing a ratio of input/output dynamical power of the rotary electric machine to input/output power of the rechargeable battery, a torque of the rotary electric machine, and a rotational speed of the rotary electric machine that are taken as parameters, based on the amount of current flowing through the rechargeable battery. A rotary electric machine controller is configured to control the rotary electric machine to operate at the operating points of the rotary electric machine set by the machine operating point setter.