Vehicle Motor System Control for Limp-Home Range Extension
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Solution Overview
Problem
In vehicles with a two-motor system, when one motor system breaks down, the vehicle can only maintain restricted driving in limp-home mode, leading to reduced efficiency as the broken motor system is not utilized, limiting the traveling distance.
Innovation Solution
A motor system control apparatus that generates counter-electromotive force in the broken motor system based on the state of charge (SOC) and traveling state of the vehicle, using this force to charge the battery, thereby extending the traveling distance in limp-home mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the broken motor system is not utilized in limp-home mode, then the system operates safely without risking damage from high counter-electromotive force, but the traveling distance is limited due to reduced efficiency
Solution Approach 1:
The patent converts the potentially harmful high counter-electromotive force generated by the broken motor system into a beneficial resource for charging the battery. By controlling the motor to operate as a generator during vehicle deceleration or downhill travel, the system recovers energy that would otherwise be wasted, extending the traveling distance in limp-home mode while maintaining system safety through controlled energy recovery.
Solution Approach 2:
The patent changes the operational parameters of the broken motor system by switching it from a motor mode to a generator mode. This parameter change allows the motor to produce counter-electromotive force that charges the battery, transforming a non-functional component into an energy recovery device that extends vehicle range without compromising system reliability.
2Duration of action of moving object
If the broken motor system is utilized to generate counter-electromotive force, then the traveling distance is extended through battery charging, but the risk of controller burnout due to high counter-electromotive force increases
Solution Approach 1:
The patent implements feedback control mechanisms that continuously monitor the counter-electromotive force generated by the broken motor system. Based on this feedback, the controller dynamically adjusts the energy recovery process to prevent excessive voltage or current that could damage the controller, thereby safely extending traveling distance through controlled battery charging.
Solution Approach 2:
The patent employs protective measures in advance to cushion against potential controller damage. By pre-configuring the control system to limit and regulate the counter-electromotive force before it reaches the controller, the system prevents harmful effects while still enabling energy recovery, thus extending traveling distance without increasing burnout risk.
3Duration of action of moving object
If additional devices are added to safely utilize the broken motor system, then the traveling distance can be extended, but the device complexity increases
Solution Approach 1:
The patent makes the existing motor system multi-functional by enabling it to operate both as a motor during normal operation and as a generator for energy recovery in limp-home mode. This universality eliminates the need for additional dedicated devices, extending traveling distance while maintaining simple system architecture.
Solution Approach 2:
The broken motor system serves itself by generating counter-electromotive force that directly charges the battery without requiring external energy recovery devices. The system's own components are repurposed to provide the energy recovery function, extending traveling distance without increasing device complexity.
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 increases the traveling distance in limp-home mode by utilizing the broken motor system to generate electrical energy for battery charging, preventing overcharging of the main battery and ensuring the controller does not burn out due to high counter-electromotive force, all achieved through software logic without additional devices.
Implementation Method 1
control the broken motor system such that counter-electromotive force of the motor is generated upon deciding to generate the counter-electromotive force
Data Source
AI summary
Disclosed is a motor system control apparatus for vehicles including a communication unit communicatively connected to a plurality of motor systems and a controller configured to, upon recognizing that one of the motor systems is broken, control the motor system such that a battery is charged using counter-electromotive force of a motor, wherein the controller confirms whether, upon recognizing breakdown of the motor system, the broken motor system is capable of generating counter-electromotive force, decides whether to generate the counter-electromotive force based on a state of charge (SOC) and a traveling state of a vehicle upon confirming that the broken motor system is capable of generating the counter-electromotive force, controls the broken motor system such that the counter-electromotive force is generated upon deciding to generate the counter-electromotive force, and charges the battery with electrical energy generated by the counter-electromotive force.