WO2021125366A1

WO2021125366A1 - System for evaluating performance of used electric vehicle

Info

Publication number: WO2021125366A1
Application number: PCT/KR2019/017775
Authority: WO
Inventors: 김형태
Original assignee: 김형태
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2021-06-24

Abstract

The present invention relates to a system for evaluating the performance of a used electric vehicle and, more specifically, to a system for evaluating the performance of a used electric vehicle, the system being capable of providing reliability for the performance of a used electric vehicle by including a system capable of evaluating the performance of a vehicle, such as vehicle efficiency and that of the motor, inverter, and battery of an electric-operated used hybrid vehicle or a used electric vehicle, and provides a system for evaluating the performance of a used electric vehicle comprising a battery, an inverter connected to the battery, and a motor connected to the inverter so as to drive wheels, the system comprising: a load device capable of providing a load when the vehicle operates; a sensor unit including a torque and angular speed sensor for checking the torque and the angular speed of the vehicle when the vehicle mounted on the load device operates, a battery voltage and current sensor for measuring the direct current voltage and current of the battery when the vehicle operates, and an inverter voltage and current sensor for measuring the alternating current voltage and current transformed by the inverter; a controller, which receives data of each sensor included in an inspection unit so as to measure efficiency, measure a voltage drop rate, manage data, and monitor data; and a control unit including a storage unit for storing data measured and calculated by the controller.

Description

Performance evaluation system for used electric vehicles

The present invention relates to a performance evaluation system of a used electric vehicle, and more particularly, a system capable of evaluating the performance of a vehicle such as a motor, an inverter, a battery, and the efficiency of a used hybrid vehicle or a used electric vehicle that can be driven by electricity It relates to a performance evaluation system for a used electric vehicle that can provide reliability for the performance of the used electric vehicle by providing the

Up to now, most vehicles have used fossil fuels, but as environmental problems due to fine dust have recently emerged, efforts to reduce the generation of soot and the like from the use of fossil fuels in automobiles are continuing.

Some of these efforts include installing a Diesel Particulate Filter (DPF) device on the exhaust of large vehicles such as trucks that generate a lot of smoke, or reducing the purchase cost of hybrid or electrically powered vehicles. can

Vehicles driven by electricity include an electric vehicle (EV), a pure electric vehicle, a hybrid electric vehicle (HEV), a hybrid vehicle, and a plug-in hybrid electric vehicle (PHEV), a rechargeable hybrid vehicle. Although the amount of hybrid or electric vehicles is gradually increasing with the spread of hybrid or electric vehicles, the performance of hybrid or electric vehicles sold as used (hereinafter referred to as 'used electric vehicles') is judged, and certification is obtained. There is currently no system that can do that. In addition, what is the performance of the used electric vehicle compared to the performance data related to the motor, inverter, and battery of the new electric vehicle, is it safe to purchase in the current state, is the price reasonable, and how soon each part should be replaced? Although it is necessary to test the performance of such as, there is no system that can test and judge for this.

In order to solve the above problems, the present invention provides the performance of a used electric vehicle that can prepare for risk factors and disputes that may occur after purchasing a used vehicle by verifying the performance of a motor, an inverter, and a battery at the point of sale of the used electric vehicle. It aims to provide an evaluation system.

In addition, the present invention compares the motor, inverter, and battery-related data of a new vehicle capable of electric drive with the performance of a used electric vehicle to determine the appropriateness of the price, the possibility of replacing parts in the future, etc. in advance before purchase. An object of the present invention is to provide a performance evaluation system for a used electric vehicle.

Another object of the present invention is to provide a performance evaluation system for used electric vehicles that can achieve safe and fair trade of used electric vehicles by providing accurate data on used electric vehicles to buyers who want to purchase used electric vehicles. .

In order to achieve the above object, the present invention provides a performance evaluation system for a used electric vehicle comprising a battery, an inverter connected to the battery, and a motor connected to the inverter to drive wheels, the system comprising: a load device capable of applying a load during operation of the load device; and a torque and angular velocity sensor that checks the torque and angular velocity of the vehicle when the vehicle mounted on the load device operates; and a DC voltage and current of the battery when the vehicle is operated a sensor unit provided with a battery voltage and current sensor for measuring , and an inverter voltage and current sensor for measuring the AC voltage and current converted by the inverter; a controller that receives data of each sensor provided in the inspection unit and performs efficiency measurement, voltage drop rate measurement, data management, and data monitoring; and a control unit comprising a storage unit configured to store the data measured by the controller and the calculated data.

In the present invention, the load device includes a vehicle lift, a roller for driving a front wheel of the used electric vehicle in front of the vehicle lift, and a motor driving the roller.

In the present invention, the controller compares the value measured in the used electric vehicle with the value of the new electric vehicle, and evaluates the performance of the used electric vehicle.

In the present invention, the controller measures the discharge rate of the battery of the used electric vehicle using the load device to measure the voltage drop rate of the used electric vehicle, and calculates the voltage drop rate of the used electric vehicle with the voltage drop rate of the new electric vehicle. It is characterized by evaluating the performance of the used electric vehicle by comparison.

In the present invention, the controller calculates the efficiency of the used electric vehicle by comparing the output value electrically input through the battery and the output value mechanically discharged through the used electric vehicle, and the calculated efficiency of the used electric vehicle and the new electric vehicle It is characterized in evaluating the performance of used electric vehicles by comparing the efficiency of

In the present invention, the control unit further comprises a data transceiver for transmitting the data stored in the storage unit to the server, and the system stores the data transmitted through the data transceiver unit, analyzes and stores the performance comparison data by vehicle type and brand It is characterized in that it further includes a server that mass-produces big data.

The present invention has the advantage of verifying the performance of the motor, inverter and battery at the point of sale of the used electric vehicle to prepare for risk factors and disputes that may occur after the purchase of the used electric vehicle.

In addition, the present invention has the advantage of being able to grasp the appropriateness of the price and the possibility of replacing parts in the future before purchasing, by comparing the motor, inverter, and battery related data of the new electric vehicle to the performance of the used electric vehicle and grasping the performance. .

In addition, the present invention can achieve safe and fair trade of used electric vehicles by providing accurate data on used electric vehicles to buyers who want to purchase used electric vehicles.

1 is a configuration diagram of a performance evaluation system for a used electric vehicle according to the present invention.

2 is a block diagram of a load device for a used electric vehicle according to the present invention.

3 is a block diagram of a performance evaluation system for a used electric vehicle according to the present invention.

4 is a graph diagram illustrating a voltage drop rate of a used electric vehicle according to the present invention.

The best mode for implementing the present invention is a performance evaluation system for a used electric vehicle comprising a battery, an inverter connected to the battery, and a motor connected to the inverter to drive wheels, the system comprising: a load device capable of applying a load during operation of the load device; and a torque and angular velocity sensor that checks the torque and angular velocity of the vehicle when the vehicle mounted on the load device operates, and the DC voltage of the battery and the battery when the vehicle is operated a sensor unit provided with a battery voltage and current sensor for measuring current, and an inverter voltage and current sensor for measuring the AC voltage and current converted by the inverter; a controller that receives data of each sensor provided in the inspection unit and performs efficiency measurement, voltage drop rate measurement, data management, and data monitoring; and a control unit comprising a storage unit for storing the data measured by the controller and the calculated data.

Hereinafter, embodiments of the present invention in which the above object can be specifically realized will be described in detail with reference to the accompanying drawings. In the description of the present embodiments, the same names and symbols are used for the same components, and an additional description thereof will be omitted.

1 is a configuration diagram of a performance evaluation system for a used electric vehicle according to the present invention, FIG. 2 is a configuration diagram of a load device for a used electric vehicle according to the present invention, and FIG. 3 is a performance evaluation of a used electric vehicle according to the present invention It is a block diagram of a system, and FIG. 4 is a graph diagram measuring a voltage drop rate of a used electric vehicle according to the present invention.

As shown in FIG. 1 , the performance evaluation system 1 of the used electric vehicle 10 according to the present invention includes a control unit 2 that processes data sensed by the used electric vehicle 10 , and a control unit 2 . A load device 3 for measuring each data of the used electric vehicle 10, and a server 4 for receiving and analyzing and storing data transmitted from the control unit 2 or transmitting the data to the control unit 2 is composed of

Prior to the performance evaluation system 1 of the used electric vehicle 10 , the operation of the used electric vehicle 10 will be briefly described. As shown in FIG. 1 , the used electric vehicle 10 includes a battery 11 charged with DC power, an Electric Power Control Unit (EPCU) for overall controlling the electric vehicle, and the control of the EPCU. It is composed of a motor 13 driven according to EPCU consists of an inverter, LDC (Low Voltage DC/DC Converter) and VCU (Vehicle Control Unit), but the EPCU is an electric vehicle that can be called an inverter (12). It is the most important part in The inverter 12 converts the high voltage DC power into AC power to drive the motor 13 . Accordingly, it can be said that the electric vehicle is largely composed of a battery 11 , an inverter 12 , and a motor 13 . The battery 11 is charged with DC power, and the charged DC power is sent to the inverter 12 through

wirings

14a and 14b. The inverter 12 has an AC/DC converter capable of converting DC power into AC power, and the AC/DC converter converts DC to AC to drive the three-phase induction motor, that is, the motor 13 . The AC power changed in the inverter 12 is transmitted to the motor through the

wires

15a, 15b, and 15c to drive the motor 13, and the motor 13 is equipped with a speed reducer to generate an appropriate speed and torque by the speed reducer. The driving shaft is driven, and the vehicle can move forward and backward as the wheel rotates according to the rotation of the driving shaft. In addition, the inverter 12 supplies energy from the high-voltage battery to the motor 13 during acceleration, and charges the battery 11 with energy generated from the motor 13 again during deceleration (regenerative braking) to increase the driving distance. It also serves to make In addition, the inverter provides the motor available torque for calculating the motor torque command of the VCU, and generates an inverter pulse width modulation (PWM-Pulse Width Modulation) signal to implement the motor torque command received from the VCU. In addition, the electric vehicle has a regenerative braking system as an inverter, and the regenerative braking system refers to a system that charges electricity to a battery when driving downhill after stepping on the brake. When the driver slows down with the brake or drives downhill, he receives inertia. At this time, the motor becomes a generator instead of the conventional power source and charges the battery with the generated power. The LDC is a device for converting a low-voltage direct current, and since the electric vehicle does not have an alternator, an LDC for charging an auxiliary battery is provided. The high voltage (DC 360V) of the battery is converted to a low voltage (DC 12V) through the LDC, and the converted low voltage supplies power to the electronic devices used in the vehicle. VCU is used to operate vehicles such as drive motor control, regenerative braking control, air conditioning load control, electric load power supply control, cluster display, DTE (Distance to Empty), reservation/remote charging/air conditioning, analog/digital signal processing and diagnosis. got involved

The used electric vehicle performance evaluation system 1 includes a control unit 2 , a load device 3 , and a server 4 . However, the used electric vehicle performance evaluation system 1 according to the present invention can evaluate the performance of the used electric vehicle even if it is configured only with the control unit 2 and the load device 3 .

The control unit 2 includes a controller 21 , a sensor unit 22 for measuring each data of the electric vehicle 10 seated on the load device 30 and transmitting it to the controller 21 , and a sensor unit 22 . ), the storage unit 24 for storing the data transmitted from the controller 21, the screen display unit 23 showing the data calculated and managed by the controller 21 to the user, and the data in the storage unit 24 is instructed by the controller 21 It consists of a data transceiver 25 that transmits data to the server 4 or receives data from the server 4 according to the method. The sensor unit 22 includes a torque and angular velocity sensor 22c that checks the torque and angular velocity of the vehicle when the vehicle mounted on the load device 3 is operating, and a DC voltage and current of the battery 11 when the vehicle is operating. It consists of a battery voltage and current sensor 22a that measures , and an inverter voltage and current sensor 22b that measures the AC voltage and current converted by the inverter 12 . The torque and angular velocity sensor 22c is installed on the wheel and the drive shaft of the driven vehicle to measure the angular velocity of the vehicle wheel and the torque acting on the drive shaft. The battery voltage and current sensor 22a measures current and voltage data transmitted through the battery 11 . The inverter voltage and current sensor 22b is for measuring the AC power converted by the inverter, and measures the voltage and current for the three-phase power.

Data sensed by the sensor unit 22 is transmitted to the controller 21 . The controller 21 receives each data measured by the sensor unit 22 to measure the efficiency, measure the voltage drop rate, manage the data, and monitor the data.

Specifically, the controller 21 evaluates the performance of the used electric vehicle by comparing the measured value of the used electric vehicle with the new electric vehicle value. Accordingly, the controller 21 measures the discharge rate of the battery 11 of the used electric vehicle 10 using the load device 3 to measure the voltage drop rate of the used electric vehicle 10, and the measured used electricity The performance of the used electric vehicle 10 is evaluated by comparing the voltage drop rate of the vehicle with the voltage drop rate of the new electric vehicle. In addition, the performance of the battery 11 may be measured through charging and discharging. That is, the performance of the battery 11 may be measured through the amount of charge and the discharge time during which the charged power is consumed.

In addition, the controller 21 calculates the efficiency of the used electric vehicle by comparing the output value electrically input through the battery 11 and the output value mechanically calculated through the used electric vehicle, and compares the calculated efficiency of the used electric vehicle and the new Evaluate the performance of used electric vehicles by comparing the efficiency of electric vehicles. That is, by calculating the voltage (V) and the current (I) input through the battery 11, the power (P1: Power) is calculated. The power P1 by the input power is calculated, and then the output value calculated through the wheel is calculated. In general, electrical data of the electric vehicle may be received through an EPCU or an on-board charger (OBC) terminal. The power value (P2) through the wheel is calculated using the torque (T:Torque) and angular velocity (ω) measured by the torque sensor and the angular velocity sensor. Using the input power and the power displayed on the wheels, the output efficiency is measured and the performance of the used electric vehicle is evaluated. In addition, the controller 21 evaluates the performance of the inverter 12 by comparing the DC power delivered through the battery 11 into AC power by the inverter 12 with the new electric vehicle.

In addition, the controller 21 may measure the performance of the motor 13 driven by AC power and evaluate the performance of the used electric vehicle by comparing it with the motor of the new electric vehicle.

Data calculated and managed by the controller 21 is displayed through the screen display unit 23 , and the user can check the status of the used electric vehicle through the management screen of the controller 21 .

The data calculated by the controller 21 and the data measured by the sensor unit 22 are all stored in the storage unit 24 , and the data stored in the storage unit 24 are transmitted and received according to the command of the controller 21 . Data transmitted to the server 4 through the unit 25 or stored in the server 4 may be received.

The server 4 classifies and manages the data transmitted from the control unit 2 by vehicle type and brand. The server 4 first classifies each data by brand, manages the performance of the used electric vehicle classified by brand, and also manages the performance of the used electric vehicle by vehicle type belonging to each brand. Performance data of used electric vehicles can be mass-produced by comparing the efficiency of new electric vehicles and used electric vehicles in the same car model, comparing battery performance (charging speed and discharging speed, etc.) and voltage drop rate comparison. Accordingly, it is possible to produce performance indicators for electric vehicles produced by each vehicle type and each year, and the performance indicators generated in this way can be stored and managed as big data. This data can be linked to the preference for each brand as the performance index of used electric vehicles, and accordingly, vehicle makers can produce better-performing vehicles, thereby contributing to industrial development.

3 shows a load device 3 according to the present invention. The load device 3 includes a lift 31 , a roller 33 installed in front of the lift 31 to receive or apply a load to the driving force of a rotating wheel, and a motor 32 for driving the roller 33 . ) is composed of The load device 3 drives the roller 33 so as to give the used electric vehicle the same conditions as in the case of driving on an actual road. Otherwise, it is idled to receive the rotation of the wheel. The load device 3 may be equipped with a torque sensor and an angular velocity sensor, and the lift 31 does not necessarily lift the used electric vehicle, and the front wheel can be driven using rollers while the used electric vehicle is stopped. If so, the lift 31 may not be necessary. In order to inspect the regenerative braking system discussed above, the motor 32 of the load device 3 drives the roller 33 and transmits the rotational force of the roller 33 to the wheels to check the state in which the battery is charged. status can be identified. That is, it is possible to apply rotational force to the motor with the load device 3 and check the health state of the motor as to whether the motor can function as a generator or whether the motor can be continued to be used.

4 shows a voltage drop diagram and a power diagram for a new electric vehicle and three used electric vehicles (A, B, and C) according to the present invention. The power when the power of the new electric vehicle is not consumed is indicated by P1. P2 is the power diagram of the new electric vehicle. In addition, the power drop diagram of the new electric vehicle and the used electric vehicle is shown sequentially from right to left. Through the power and voltage drop rate, the performance of the used electric vehicle can be displayed as an indicator.

After evaluating each performance, it can be indexed by multiplying it by a constant factor. In addition, a performance index can be created by setting standard items for performance evaluation.

It is obvious to those of ordinary skill in the art that the present invention is not limited to the above embodiments and can be variously modified and modified within the scope without departing from the technical gist of the present invention. will be.

The present invention relates to a performance evaluation system for a used electric vehicle, provided with a system capable of evaluating vehicle performance, such as a motor, an inverter, a battery, and vehicle efficiency of a used hybrid vehicle or a used electric vehicle that can be driven by electricity It is an invention with great industrial applicability that can give reliability to the performance of an electric vehicle.

Claims

A performance evaluation system for a used electric vehicle comprising a battery, an inverter connected to the battery, and a motor connected to the inverter to drive wheels,

The system is

A load device capable of giving a load during operation of the vehicle; and

a torque and angular velocity sensor for checking the torque and angular velocity of the vehicle when the vehicle mounted on the load device is operating; a battery voltage and current sensor for measuring the DC voltage and current of the battery when the vehicle is operated; a sensor unit provided with an inverter voltage and current sensor for measuring the converted AC voltage and current; a controller that receives the sensor data measured by the sensor unit to measure efficiency, measure voltage drop rate, manage data, and monitor data; and a control unit comprising a storage unit for storing the data measured by the controller and the calculated data;

A performance evaluation system for used electric vehicles, characterized in that consisting of
According to claim 1,

and the load device includes a vehicle lift, a roller for driving a front wheel of the used electric vehicle in front of the vehicle lift, and a motor driving the roller.
3. The method of claim 2,

The controller is

The performance evaluation system of the used electric vehicle, characterized in that the performance of the used electric vehicle is evaluated by comparing the measured value of the used electric vehicle with the value of the new electric vehicle.
4. The method of claim 3,

The controller measures the discharge rate of the battery of the used electric vehicle using the load device to measure the voltage drop rate of the used electric vehicle, and compares the voltage drop rate of the used electric vehicle with the voltage drop rate of the new electric vehicle A performance evaluation system for a used electric vehicle, characterized in that the performance of the used electric vehicle is evaluated.
5. The method of claim 4,

The controller calculates the efficiency of the used electric vehicle by comparing the output value electrically input through the battery and the output value mechanically discharged through the used electric vehicle, and compares the calculated efficiency of the used electric vehicle and the new electric vehicle A performance evaluation system for used electric vehicles, characterized in that the performance of the used electric vehicle is evaluated by comparing the efficiency of the used electric vehicle.
According to claim 1,

The control unit further comprises a data transceiver for transmitting the data stored in the storage to the server,

The system further comprises a server that stores the data transmitted through the data transceiver, analyzes and stores performance comparison data for each vehicle type and each brand, and mass-produces big data.