CN206270407U - A real-time measurement device for electric vehicle power consumption - Google Patents

Abstract

The new model relates to a real-time measurement device for electric vehicle power consumption, including a notebook computer, a USB data collector, a DC converter, a low-pass filter I, a low-pass filter II, a Hall current sensor module, and a resistor divider circuit; The data collector is connected to the USB port of the notebook computer through the communication line; the input terminal of the DC converter is connected to the notebook computer, and the DC converter is connected to the Hall current sensor module; the Hall current sensor module is connected to the USB data through the low-pass filter Ⅰ. For the collector, the resistor divider circuit is connected across the positive and negative wires of the battery output, and the output of the resistor divider circuit is connected to the USB data collector through the low-pass filter II. On the one hand, the new model can obtain the consumed electric energy, instantaneous current and voltage changes by detecting the current and voltage and calculating, so as to truly reflect the running state of the electric vehicle, and thus identify parameters such as roads; on the other hand, the new model has a simple structure Answer Easy to disassemble, flexible and convenient to use.

Description

A real-time measurement device for electric vehicle power consumption

technical field

The model relates to a real-time measuring device for electric vehicle power consumption, which belongs to the field of electric vehicles.

Background technique

Electric vehicles replace the fuel tank of traditional gasoline vehicles with batteries, and replace the internal combustion engine with electric motors; therefore, electric vehicles do not emit exhaust gas, do not cause environmental pollution, reduce the content of PM2.5 in the air to a large extent, and achieve energy saving and reduction. row, can realize the sustainable development of the automobile industry.

Due to the driving environment of electric vehicles, the environment is very complicated. The running state of the car is ever-changing, which is closely related to the performance of the car itself, road conditions, driver's operation, load, etc. The energy of an electric vehicle is ultimately reflected in the output power and power consumption of the battery. Therefore, the power consumption characteristics largely reflect the characteristics of the important components of the vehicle itself. Since the electric vehicle is a very complex mechatronic system, the theoretical calculation results of its characteristics are quite different from the actual operation results. Therefore, it is very important to detect the battery output current and voltage in real time. However, due to the inconvenient testing of electric vehicles during driving, overly bulky equipment has great potential safety hazards, and may bring a huge load effect, which gives real-time monitoring of electric vehicle power consumption, electric vehicle Performance evaluation and improvement have brought difficulties.

Utility model content

Aiming at the technical problem that it is difficult to quickly and accurately detect power consumption in real time during the actual operation of the electric vehicle, the present invention provides a real-time measurement device for the power consumption of the electric vehicle. The utility model evaluates and improves the performance of the electric vehicle, promotes its wide application in all walks of life, and has important practical value.

The technical scheme that this novel adopts is:

A real-time measurement device for electric vehicle power consumption, including a notebook computer, a USB data collector, a DC converter, a low-pass filter I, a low-pass filter II, a Hall current sensor module, and a resistor divider circuit; the USB data collector Connect with the USB port of the notebook computer through the communication line; the input terminal of the DC converter is connected with the USB port of the notebook computer, and the output terminal of the DC converter is connected with the Hall current sensor module; the DC converter takes power from the USB port of the notebook computer , and transform it into the power supply voltage required by the Hall current sensor module; the wire connected to the positive pole of the battery output passes through the detection hole on the original side of the Hall current sensor module, and the analog signal output by the Hall current sensor module passes through a low-pass filter The device Ⅰ is connected to the USB data collector, which is converted into a value representing the current through the USB data collector; the resistor voltage divider circuit is connected across the positive and negative wires of the battery output, and the output of the resistor voltage divider circuit is connected through the low-pass filter Ⅱ The USB data collector is converted into a value representing the voltage through the USB data collector; the notebook computer obtains the current and voltage values from the USB data collector through the USB port; the resistor divider circuit includes two precision resistors.

The beneficial effect that this novel has is:

(1) The electric vehicle power consumption real-time measuring device provided by the present invention can obtain the instantaneous power of the electric vehicle by multiplying the current and the voltage by detecting the current and voltage, and then obtain the consumed electric energy by integration. Changes in instantaneous current and voltage reflect the operating status of the electric vehicle, from which parameters such as roads can be identified.

(2) The measuring device provided by the new model directly adopts the USB port of the notebook computer for power supply, does not need an additional battery, and does not take power from the battery of the electric vehicle, which reduces the load effect, is simple and convenient, and is very suitable for on-site measurement, that is, Road test.

(3) The measuring device provided by the present invention adopts a Hall current sensor module in current measurement, which is easy to disassemble and facilitates engineering application.

Description of drawings

The utility model is described in detail below in conjunction with accompanying drawing and specific embodiment;

Fig. 1 is a composition diagram of the measuring device provided by the present invention.

Fig. 2 is a schematic diagram of the position of the measuring device provided by the present invention on the electric vehicle when it works.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific embodiments.

As shown in Figure 1, the real-time measurement device for electric vehicle power consumption includes a notebook computer 1, a USB data collector 2, a DC converter 3, a low-pass filter Ⅰ 4, a low-pass filter Ⅱ 5, a Hall current sensor module 5, a resistor Voltage divider circuit6.

The USB data collector 2 is connected to the USB port of the notebook computer 1 through a communication line; the input terminal of the DC converter 3 is connected to the USB port of the notebook computer 1, and the output terminal of the DC converter 3 is connected to the Hall current sensor module 5; The converter 3 takes power from the USB port of the notebook computer 1, and converts it into the power supply voltage required by the Hall current sensor module 5; the wire connected to the positive pole of the battery output passes through the detection hole on the original side of the Hall current sensor module 5 , the analog signal output by the Hall current sensor module 5 is connected to the USB data collector 2 through the low-pass filter I4, and converted into a value representing the current magnitude through the USB data collector 2; the resistor voltage divider circuit 6 is connected across the battery output positive On the negative wire, the output of the resistor divider circuit 6 is connected to the USB data collector 2 through the low-pass filter II5, and converted into a digital value representing the voltage through the USB data collector 2; the notebook computer 1 collects the data from the USB through the USB port. The device 2 obtains the values of current and voltage; the resistor divider circuit 6 includes two precision resistors.

As shown in Figure 2, when the present invention is implemented, the electric vehicle power consumption real-time measurement device provided by the present invention is installed between the battery and the inverter of the electric vehicle. Assuming that the motor is a three-phase AC motor, the inverter is responsible for converting the DC power output by the battery into the three-phase AC power required by the motor. The amplitude and frequency during the conversion process depend on the driver's intention and the driving state of the car. Controller control. The output of the electric motor is connected by a differential to the drive wheels through two half shafts. It is worth pointing out that the motor can be a DC motor, and at this time, the inverter is a DC converter. For the case of four-wheel drive, the output of the motor is connected to each drive axle through a transfer case.

The voltage obtained by the USB data collector is the voltage divided by two precision resistors connected in series in the resistor divider circuit, which needs to be converted into the real-time voltage of the battery according to the size of the two resistors.

The device provided by the invention measures the current and voltage output by the battery in real time, and the instantaneous power of the electric vehicle is obtained by multiplying the two together, and then the consumed electric energy is obtained by integration. The change of instantaneous current and voltage reflects the operating state of the electric vehicle, which can be used to identify the performance parameters of roads and important components of the vehicle, and accurately estimate the cruising range of the vehicle.

The above-mentioned multiplication and integral operations can be realized by one of the following two schemes: (1) programming on a notebook computer, (2) adding a hardware multiplier and an integrator in the composition diagram shown in FIG. 2 .

In the present model, the low-pass filter I and the low-pass filter II can be directly omitted. After the notebook computer obtains the current and voltage signals through the USB data collector, the software on the notebook computer performs low-pass filtering.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form. Those skilled in the art can make simple modifications, equivalent changes or modifications using the technical content suggested above, for example, the precision resistance Changing to ordinary resistance, and then obtaining the effect of precision resistance through calibration, all fall within the scope of protection of the present invention.

Claims (1)

1. a kind of electric automobile power consumption real-time measurement apparatus, it is characterised in that：Described electric automobile power consumption real-time measurement apparatus Including notebook computer, usb data collector, DC converter, low pass filter I, low pass filter II, Hall current sensing Device module, resistor voltage divider circuit；Described usb data collector is connected by connection with the USB port of notebook computer；It is described The input of DC converter be connected with the USB port of notebook computer, output end and the Hall electricity of described DC converter Flow sensor module is connected；Described DC converter is transformed to Hall current sensing from the USB port power taking of notebook computer The supply voltage that device module needs；Detection of the electric wire that the positive pole exported with battery is connected from Hall current sensor module primary side Passed through in hole, the analog signal of described Hall current sensor module output connects usb data and gathers by low pass filter I Device, the numerical value for representing size of current is converted to by usb data collector；Described resistor voltage divider circuit is connected across battery output Both positive and negative polarity electric wire on, the output of described resistor voltage divider circuit connects usb data collector by low pass filter II, passes through Usb data collector is converted to the numerical value for representing voltage swing；Described notebook computer is gathered by USB port from usb data Device obtains the numerical value of electric current and voltage；Described resistor voltage divider circuit includes two precision resistances.