Calculation system and calculation method for instantaneous power consumption of pure electric vehicle

Abstract

The invention discloses a system and method for calculating instantaneous power consumption of a pure electric vehicle, and belongs to the technical field of pure electric vehicles. The method comprises the steps that S1, the vehicle is ready; s2, the vehicle control unit obtains the voltage and current of the vehicle power battery and calculates the discharge power of the vehicle power battery; s3, the vehicle control unit obtains the voltage and the current of the accessory module and calculates the discharge power of the accessory module; s4, the vehicle control unit judges whether the vehicle speed is larger than a preset speed threshold value or not, if yes, the step S5 is executed, and if not, the step S7 is executed; s5, the vehicle control unit calculates the discharge power generated in the vehicle driving process; s6, the vehicle control unit calculates instantaneous power consumption generated in the vehicle driving process; and S7, ending. By means of the system and method for calculating the instantaneous power consumption of the pure electric vehicle, the instantaneous power consumption generated in the running process of the pure electric vehicle can be accurately obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of pure electric vehicles, and in particular, relates to a system and method for calculating instantaneous power consumption of a pure electric vehicle. Background Art

[0002] With the country's support for the new energy vehicle industry, the proportion of our new energy vehicles is gradually increasing, but the end customers' anxiety about safety and mileage has become a prominent problem during use. In order to more accurately evaluate the battery power consumption of the vehicle during driving, it is necessary to monitor the instantaneous power consumption during the entire driving cycle in real time.

[0003] Patent CN108128168B discloses a method and device for calculating the average power consumption of an electric vehicle, the method comprising the following steps: obtaining the discharge energy of the power battery of the electric vehicle during this calculation cycle; judging whether the discharge energy is greater than or equal to the first charging energy, the first charging energy comprising the accumulated energy charged into the power battery from the charging gun during the current calculation cycle, and the initial available energy of the power battery at the beginning of the current calculation cycle; when the judgment result indicates that the discharge energy is greater than or equal to the first charging energy, calculating the average power consumption according to the first charging energy, the discharge efficiency of the power battery and the mileage of the electric vehicle during the current calculation cycle.

[0004] However, the technology disclosed in the above patent cannot obtain the accurate instantaneous power consumption generated during the driving of the pure electric vehicle. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a system and method for calculating the instantaneous power consumption of a pure electric vehicle in view of the deficiencies in the prior art, so as to achieve the purpose of being able to accurately obtain the instantaneous power consumption generated during the driving process of the pure electric vehicle.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a system for calculating instantaneous power consumption of a pure electric vehicle, comprising a battery management system (BMS), an accessory module and a whole vehicle controller, wherein the battery management system (BMS) is connected to the whole vehicle controller; the accessory module is connected to the whole vehicle controller.

[0008] Furthermore, the accessory module includes a compressor, a DC-DC converter and a positive temperature coefficient (PTC) heater, the compressor is connected to the vehicle controller; the DC-DC converter is connected to the vehicle controller; the positive temperature coefficient (PTC) heater is connected to the vehicle controller.

[0009] Furthermore, the vehicle controller obtains the voltage and current of the vehicle power battery and calculates the discharge power of the vehicle power battery.

[0010] Furthermore, the vehicle controller obtains the voltage and current of the accessory module and calculates the discharge power of the accessory module.

[0011] Furthermore, the vehicle controller determines whether the vehicle speed is greater than a preset speed threshold. If so, the vehicle controller calculates the instantaneous power consumption generated during the vehicle's driving.

[0012] Furthermore, the preset speed threshold is 2 kilometers per hour.

[0013] The present invention also provides a method for calculating the instantaneous power consumption of a pure electric vehicle, the method comprising the following steps:

[0014] S1: Vehicle is ready (Ready);

[0015] S2: The vehicle controller obtains the voltage and current of the vehicle power battery and calculates the discharge power of the vehicle power battery;

[0016] S3: The vehicle controller obtains the voltage and current of the accessory module and calculates the discharge power of the accessory module;

[0017] S4: The vehicle controller determines whether the vehicle speed is greater than a preset speed threshold. If so, it proceeds to S5; if not, it proceeds to S7;

[0018] S5: The vehicle controller calculates the discharge power generated during the vehicle's driving process;

[0019] S6: The vehicle controller calculates the instantaneous power consumption generated during the vehicle's driving;

[0020] S7: End.

[0021] Furthermore, the instantaneous power consumption generated during the driving of the vehicle is equal to the definite integral of the discharge power generated during the driving of the vehicle within a preset time.

[0022] Furthermore, the preset time is 10 milliseconds.

[0023] The instantaneous power consumption calculation system and calculation method of the present invention have the following advantages:

[0024] (1) The instantaneous power consumption calculation system and calculation method of the present invention can accurately obtain the instantaneous power consumption generated during the driving of a pure electric vehicle.

[0025] (2) The instantaneous power consumption of the entire vehicle can be calculated by the instantaneous power consumption calculation system and calculation method of the present invention.

[0026] (3) The instantaneous power consumption of the accessory module can be calculated by the instantaneous power consumption calculation system and calculation method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] This specification includes the following drawings, which show the following contents:

[0028] Figure 1 It is a logical structure block diagram of a calculation system for instantaneous power consumption of a pure electric vehicle of the present invention;

[0029] Figure 2 The present invention is a flowchart of a method for calculating instantaneous power consumption of a pure electric vehicle.

[0030] Explanation of the accompanying drawings: 1. Battery management system (BMS); 2. Accessory module; 3. Vehicle controller; 21. Compressor; 22. DC-DC (DC-DC) converter; 23. Positive temperature coefficient (PTC) heater. DETAILED DESCRIPTION

[0031] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0032] Figure 1 It is a logical structure block diagram of a calculation system for instantaneous power consumption of a pure electric vehicle of the present invention, including a battery management system (BMS) 1, an accessory module 2 and a vehicle controller 3, wherein the battery management system (BMS) 1 is connected to the vehicle controller 3; the accessory module 2 is connected to the vehicle controller 3. Among them, the accessory module 2 includes a compressor 21, a DC-DC converter 22 and a positive temperature coefficient (PTC) heater 23, the compressor 21 is connected to the vehicle controller 3; the DC-DC converter 22 is connected to the vehicle controller 3; the positive temperature coefficient (PTC) heater 23 is connected to the vehicle controller 3. In addition, in this specific embodiment, the compressor 21 refers to the air-conditioning compressor in the car.

[0033] Combine the following Figure 1 The working principle of the system of the present invention is introduced as follows:

[0034] Under the condition of vehicle Ready, the voltage and current of the vehicle power battery are obtained through the vehicle controller 3 and the discharge power of the vehicle power battery is calculated. Specifically, after the vehicle controller 3 obtains the voltage and current of the vehicle power battery, the vehicle controller 3 calculates the discharge power of the vehicle power battery by multiplying the obtained voltage and current of the vehicle power battery; the voltage and current of the accessory module 2 are obtained through the vehicle controller 3 and the discharge power of the accessory module 2 is calculated. Specifically, the operating voltage and operating current of the compressor 21, the DC-DC converter 22 and the positive temperature coefficient (PTC) heater 23 are respectively obtained through the vehicle controller 3. After obtaining the working voltage and working current of the PTC heater 23, the vehicle controller 3 calculates the discharge power of the compressor 21 by multiplying the obtained working voltage and working current of the compressor 21, the vehicle controller 3 calculates the discharge power of the DC-DC converter 22 by multiplying the obtained working voltage and working current of the DC-DC converter 22, the vehicle controller 3 calculates the discharge power of the positive temperature coefficient (PTC) heater 23 by multiplying the obtained working voltage and working current of the PTC heater 23, and the sum of the discharge powers of the compressor 21, the DC-DC converter 22 and the PTC heater 23 is the discharge power of the accessory module 2. After the vehicle controller 3 obtains the discharge power of the vehicle power battery and the discharge power of the accessory module 2, the vehicle controller 3 determines whether the vehicle speed is greater than the preset speed threshold. If so, the vehicle controller 3 calculates the instantaneous power consumption generated during the vehicle driving process. Specifically, after the vehicle controller 3 obtains the discharge power of the vehicle power battery and the discharge power of the accessory module 2, the vehicle controller 3 determines whether the vehicle speed is greater than the preset speed threshold. If the vehicle controller 3 determines that the current vehicle speed is greater than the preset speed threshold, the vehicle controller 3 calculates the instantaneous power consumption generated during the vehicle driving process. Among them, the calculation process is that the vehicle controller 3 uses the discharge power of the vehicle power battery to subtract the discharge power of the accessory module 2 to obtain the discharge power generated during the vehicle driving process. The vehicle controller 3 then obtains the instantaneous power consumption generated during the vehicle driving process by taking the discharge power generated during the vehicle driving process as a definite integral within a preset time. That is, the instantaneous power consumption generated during the driving process of the pure electric vehicle can be accurately obtained through the present invention. The instantaneous power consumption is consumed by driving.

[0035] Figure 2 The present invention is a flowchart of a method for calculating the instantaneous power consumption of a pure electric vehicle, the method comprising the following steps:

[0036] S1: Vehicle is ready (Ready); Figure 2 Specifically, the vehicle is ready (Ready) is a prerequisite for the subsequent steps, and the vehicle needs to be put into the Ready state first.

[0037] S2: The vehicle controller 3 obtains the voltage and current of the vehicle power battery and calculates the discharge power of the vehicle power battery; that is, the corresponding Figure 2 S2 in. Specifically, when the vehicle is in the Ready state, the vehicle controller 3 obtains the voltage and current of the vehicle power battery and calculates the discharge power of the vehicle power battery. Specifically, after the vehicle controller 3 obtains the voltage and current of the vehicle power battery, the vehicle controller 3 calculates the discharge power of the vehicle power battery by multiplying the obtained voltage and current of the vehicle power battery.

[0038] S3: The vehicle controller 3 obtains the voltage and current of the accessory module 2 and calculates the discharge power of the accessory module 2; that is, the corresponding Figure 2 S3 in. Specifically, when the vehicle is in the Ready state, the vehicle controller 3 will respectively obtain the operating voltages and operating currents of the compressor 21, the DC-DC converter 22 and the positive temperature coefficient (PTC) heater 23. After the vehicle controller 3 obtains the operating voltages and operating currents of the compressor 21, the DC-DC converter 22 and the positive temperature coefficient (PTC) heater 23 respectively, the vehicle controller 3 calculates the discharge power of the compressor 21 by multiplying the obtained operating voltage and operating current of the compressor 21. The vehicle controller 3 calculates the discharge power of the DC-DC converter 22 by multiplying the obtained operating voltage and operating current of the DC-DC converter 22. The vehicle controller 3 calculates the discharge power of the PTC heater 23 by multiplying the obtained operating voltage and operating current of the PTC heater 23. The sum of the discharge powers of the compressor 21, the DC-DC converter 22 and the PTC heater 23 is the discharge power of the accessory module 2.

[0039] S4: The vehicle controller 3 determines whether the vehicle speed is greater than a preset speed threshold. If so, it proceeds to S5; if not, it proceeds to S7; that is, corresponding to Figure 2 Specifically, after the vehicle controller 3 obtains the discharge power of the vehicle power battery and the discharge power of the accessory module 2, the vehicle controller 3 determines whether the vehicle speed is greater than the preset speed threshold. If the vehicle controller 3 determines that the current vehicle speed is greater than the preset speed threshold, it enters S5. If the vehicle controller 3 determines that the current vehicle speed is not greater than the preset speed threshold, it enters S7.

[0040] S5: The vehicle controller 3 calculates the discharge power generated during the vehicle's driving process; Figure 2 Specifically, when the vehicle controller 3 determines that the current vehicle speed is greater than the preset speed threshold, the vehicle controller 3 calculates the discharge power generated during the vehicle driving process, which is equal to the discharge power of the vehicle power battery minus the discharge power of the accessory module 2.

[0041] S6: The vehicle controller 3 calculates the instantaneous power consumption generated during the vehicle's driving process; Figure 2 S6 in the figure. Specifically, after obtaining the discharge power generated during the vehicle driving process, the vehicle controller 3 calculates the instantaneous power consumption generated during the vehicle driving process. Among them, the instantaneous power consumption generated during the vehicle driving process is equal to the definite integral of the discharge power generated during the vehicle driving process within a preset time. That is, the instantaneous power consumption generated during the driving process of the pure electric vehicle can be accurately obtained through the present invention, and the instantaneous power consumption is consumed by driving.

[0042] S7: End; corresponding Figure 2 S7 in.

[0043] In this specific implementation, the preset speed threshold is 2 kilometers per hour; the preset time is 10 milliseconds.

[0044] In addition, in the present invention, the instantaneous power consumption of the whole vehicle can be further obtained by integrating the obtained discharge power of the power battery of the whole vehicle with time; the instantaneous power consumption of the accessory module 2 can also be further obtained by integrating the obtained discharge power of the accessory module 2 with time. That is, the instantaneous power consumption of the whole vehicle and the instantaneous power consumption of the accessory module 2 can also be obtained through the present invention.

[0045] Functions and Effects of the Embodiments

[0046] After the vehicle controller 3 obtains the discharge power of the vehicle power battery and the discharge power of the accessory module 2, the vehicle controller 3 will determine whether the vehicle speed is greater than the preset speed threshold. If the vehicle controller 3 determines that the current vehicle speed is greater than the preset speed threshold, the vehicle controller 3 will calculate the instantaneous power consumption generated during the vehicle's driving. The calculation process is that the vehicle controller 3 uses the discharge power of the vehicle power battery minus the discharge power of the accessory module 2 to obtain the discharge power generated during the vehicle's driving. The vehicle controller 3 then obtains the instantaneous power consumption generated during the vehicle's driving by taking the discharge power generated during the vehicle's driving as a definite integral within a preset time. That is, the present invention can obtain the accurate instantaneous power consumption generated during the driving of a pure electric vehicle, which is consumed by driving.

[0047] The instantaneous power consumption of the whole vehicle can be further obtained by integrating the obtained discharge power of the power battery of the whole vehicle with time; the instantaneous power consumption of the accessory module 2 can be further obtained by integrating the obtained discharge power of the accessory module 2 with time. That is, the instantaneous power consumption of the whole vehicle and the instantaneous power consumption of the accessory module 2 can also be obtained through the present invention.

[0048] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A system for calculating the instantaneous power consumption of a pure electric vehicle, characterized in that: It includes a battery management system (BMS), an accessory module and a vehicle controller. The battery management system (BMS) is connected to the vehicle controller; the accessory module is connected to the vehicle controller.

2. A system for calculating instantaneous power consumption of a pure electric vehicle as claimed in claim 1, characterized in that: The accessory module includes a compressor, a direct current-to-direct current (DC-DC) converter and a positive temperature coefficient (PTC) heater, the compressor is connected to the vehicle controller; the direct current-to-direct current (DC-DC) converter is connected to the vehicle controller; the positive temperature coefficient (PTC) heater is connected to the vehicle controller.

3. A system for calculating instantaneous power consumption of a pure electric vehicle as claimed in claim 2, characterized in that: The vehicle controller obtains the voltage and current of the vehicle power battery and calculates the discharge power of the vehicle power battery.

4. A system for calculating instantaneous power consumption of a pure electric vehicle as claimed in claim 3, characterized in that: The vehicle controller obtains the voltage and current of the accessory module and calculates the discharge power of the accessory module.

5. A system for calculating instantaneous power consumption of a pure electric vehicle as claimed in claim 4, characterized in that: The vehicle controller determines whether the vehicle speed is greater than a preset speed threshold. If so, the vehicle controller calculates the instantaneous power consumption generated during the vehicle's driving process.

6. A system for calculating instantaneous power consumption of a pure electric vehicle as claimed in claim 5, characterized in that: The preset speed threshold is 2 kilometers per hour.

7. A method for calculating the instantaneous power consumption of a pure electric vehicle according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1: Vehicle is ready (Ready); S2: The vehicle controller obtains the voltage and current of the vehicle power battery and calculates the discharge power of the vehicle power battery; S3: The vehicle controller obtains the voltage and current of the accessory module and calculates the discharge power of the accessory module; S4: The vehicle controller determines whether the vehicle speed is greater than a preset speed threshold. If so, it proceeds to S5; if not, it proceeds to S7; S5: The vehicle controller calculates the discharge power generated during the vehicle's driving process; S6: The vehicle controller calculates the instantaneous power consumption generated during the vehicle's driving; S7: End.

8. A method for calculating the instantaneous power consumption of a pure electric vehicle as described in claim 7, wherein the instantaneous power consumption generated during the driving of the vehicle is equal to the definite integral of the discharge power generated during the driving of the vehicle within a preset time.

9. A method for calculating instantaneous power consumption of a pure electric vehicle as claimed in claim 8, characterized in that: The preset time is 10 milliseconds.

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