Range extender intelligent power protection control method and control device based on power following

Abstract

The invention provides a range extender intelligent power protection control method and device based on power following, and solves the technical problem that the balance conflict between power adjustment and power fluctuation cannot be realized in the power output process of an existing range extender. The method comprises the following steps: forming average electricity consumption power in a time statistics period in a driving process; forming the target output power of the range extender according to the matching rule of the fixed-point generated power of the optimal oil consumption working point of the range extender and the current average electricity consumption power; and the average electricity utilization power output by the power battery is followed by the target output power of the range extender in the follow-up time statistical period. The power generation power value of the optimal oil consumption working point of the range extender is fully utilized to form a broadband filtering state, energy consumption of a power battery is made up in a weekly average power iteration mode, rapid fluctuation of the output power of the range extender under an original power following strategy can be effectively stabilized, oil consumption and battery SOC keeping are both considered, and the energy consumption of the range extender is reduced. A timely intelligent power protection processing mechanism is formed, and the utilization efficiency of the power battery is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to an intelligent power conservation control method and control device for a range extender based on power following. Background Art

[0002] In the prior art, extended-range vehicles are widely valued because they are equipped with both power batteries and range extenders containing internal combustion engines, which can effectively expand the maneuvering range of the vehicle and solve the mileage anxiety problem of pure electric vehicles caused by power battery charging facilities, capacity and energy replenishment speed. The main energy source of extended-range vehicles is the range extender, and the control method of the range extender's power output determines the energy supply method when the vehicle is driving. The existing power output control of the range extender is mainly a fixed-point working method and a power following working method. The fixed-point working method refers to a control method in which the range extender continues to work at a fixed working point after it is started. This method can minimize the fuel consumption of the whole vehicle by working at the optimal fuel consumption point calibrated by the engine, but the output power is constant and the power conservation function cannot be achieved. The power following working method is that the range extender adjusts the output power at any time according to the changes in the power consumption of the whole vehicle. This method has a large power fluctuation range and a high fuel consumption rate. Summary of the invention

[0003] In view of the above problems, an embodiment of the present invention provides an intelligent power conservation control method and control device for a range extender based on power following, which solves the technical problem that the power output process of the existing range extender cannot effectively balance the conflict between power regulation and power fluctuation.

[0004] The intelligent power conservation control method of a range extender based on power following according to an embodiment of the present invention includes:

[0005] The average power consumption in the time statistical period during the vehicle driving process is formed;

[0006] The target output power of the range extender is formed according to the matching rule between the fixed-point power generation power at the range extender's optimal fuel consumption operating point and the current average power consumption;

[0007] In the subsequent statistical period, the target output power of the range extender is used to follow the average power consumption output by the power battery.

[0008] In one embodiment of the present invention, the formation of the average power consumption includes:

[0009] Collect power battery operating parameters in real time from CAN bus;

[0010] Driving mode tracking is formed according to the power battery operating parameters;

[0011] , set the time statistical period according to the driving mode, and calculate the average power consumption within the time statistical period.

[0012] In one embodiment of the present invention, forming the target output power of the range extender includes:

[0013] Compare the fixed-point power generation with the current average power consumption, and use the larger value as the alternative output power;

[0014] Compare the alternative output power, the maximum charging power of the power battery and the rated output power of the range extender and take the smaller value as the target output power of the range extender.

[0015] In one embodiment of the present invention, the forming of power following the power battery output includes:

[0016] In the next time statistical period, the range extender transmits electric power to the power battery according to the target output power;

[0017] In a continuous time statistical period, the target output power of the next time statistical period follows the average power consumption output by the power battery of the previous time statistical period.

[0018] In one embodiment of the present invention, it further includes:

[0019] Set the SOC value drop threshold of the power battery, trigger the target output power optimization according to the drop threshold, and perform power compensation to maintain the SOC value of the power battery.

[0020] In one embodiment of the present invention, performing power compensation to maintain the SOC value of the power battery includes:

[0021] Detect the continuous increase trend of the average power consumption output by the power battery and the decrease trend of the SOC value of the power battery within the continuous time statistical period;

[0022] When the SOC value drops to a preset threshold, the target output power is optimized according to the compensation coefficient to keep the SOC value returning to the power conservation setting value.

[0023] The intelligent power conservation control device for a range extender based on power following according to an embodiment of the present invention comprises:

[0024] A memory, used to store program codes in the process of processing the intelligent power conservation control method for a range extender based on power following as claimed in any one of claims 1 to 6;

[0025] A processor is used to execute the program code.

[0026] The intelligent power conservation control device for a range extender based on power following according to an embodiment of the present invention comprises:

[0027] A data collection module is used to form the average power consumption within a time statistical period during the vehicle's driving process;

[0028] A data processing module, used for forming a target output power of the range extender according to a matching rule between a fixed-point power generation power at an optimal fuel consumption operating point of the range extender and a current average power consumption;

[0029] The power output module is used to follow the average power consumption output by the power battery with the target output power of the range extender in the subsequent time statistical period.

[0030] The intelligent power conservation control method and control device for a range extender based on power following in an embodiment of the present invention fully utilize the power generation value of the range extender at the optimal fuel consumption operating point to form a broadband filtering state, perform weighted processing on the power consumption with rapidly changing states during driving, and compensate for the energy consumption of the power battery in a manner of iterative average power between cycles. The rapid fluctuation of the output power of the range extender under the original power following strategy can be effectively smoothed, and the power of the range extender and the power battery can be prevented from exceeding the rated value, while taking into account fuel consumption and power battery SOC maintenance, forming a timely intelligent power conservation processing mechanism, and effectively improving the utilization efficiency of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a flow chart of an intelligent power conservation control method for a range extender based on power following according to an embodiment of the present invention.

[0032] Figure 2 FIG. 1 is a schematic diagram showing simulation results of an intelligent power conservation control method for a range extender based on power following according to an embodiment of the present invention.

[0033] Figure 3 The figure shows a schematic diagram of the architecture of an intelligent power conservation control device for a range extender based on power following according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer and more understandable, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] An intelligent power conservation control method for a range extender based on power following according to an embodiment of the present invention is as follows Figure 1 As shown. Figure 1 In this embodiment, the present invention includes:

[0036] Step 100: Calculate the average power consumption during the time statistical period during the vehicle driving process.

[0037] Those skilled in the art will understand that the energy supply system of the extended-range electric vehicle includes a range extender and a power battery composed of a fuel engine and a generator. The range extender uses fuel to generate electricity to charge the power battery, and the power battery is controlled to output electric drive power. The time statistical period usually refers to an artificially divided time period, which can be a basic timing period of a fixed duration, or a specific time period formed by counting the basic timing period. The average power consumption refers to the output power of the power battery consumed for vehicle driving and charging the small battery during the time statistical period. The small battery is usually responsible for providing continuous power to lamps, air conditioners, and active devices on the control bus. The power consumption of the vehicle during driving is related to the driving environment, driving habits and driving mode. Different driving modes form corresponding power response characteristics by calibrating the peak value and change rate of the driving power change.

[0038] Step 200: forming a target output power of the range extender according to a matching rule between the fixed-point power generation power at the range extender's optimal fuel consumption operating point and the current average power consumption.

[0039] Those skilled in the art can understand that there is an optimal fuel consumption operating point for fuel engines to maximize fuel economy. The electromechanical conversion at the optimal fuel consumption operating point forms a fixed-point power generation. In order to maximize stability at the optimal fuel consumption operating point, a matching rule is formed between the range extender output power, the average power consumption and the fixed-point power generation to form a range extender output power that is conducive to maintaining the optimal fuel consumption, while meeting the needs of average power consumption during subsequent time statistical periods.

[0040] Step 300: In a subsequent time statistical period, the range extender follows the average power consumption output by the power battery with the target output power.

[0041] The target output power of the range extender has the characteristic of output delay. The target output power is calculated in the current time period and output to the power battery in the next statistical period. The range extender power output follows the average power consumption of the power battery. As the average power consumption of the power battery changes, the range extender power follows the power consumption of the power battery in the continuous statistical period.

[0042] The intelligent power conservation control method for the range extender based on power following in the embodiment of the present invention makes full use of the power value of the range extender at the optimal fuel consumption working point to form a broadband filtering state, performs weighted processing on the power consumption that changes rapidly during driving, and compensates for the energy consumption of the power battery in the form of average power iteration between cycles, which can effectively smooth the rapid fluctuation of the output power of the range extender under the original power following strategy, and prevent the power of the range extender and the power battery from exceeding the rated value. At the same time, the power output of the range extender takes into account both fuel consumption and power battery SOC maintenance, and forms a timely intelligent power conservation processing mechanism based on the average power consumption, effectively improving the maintenance efficiency of the power battery, forming an automatic control effect of shallow charging and shallow discharging, and avoiding the rapid decline of power battery performance.

[0043] like Figure 1 As shown, in one embodiment of the present invention, it also includes:

[0044] Step 400: Setting a SOC value drop threshold of the power battery, triggering target output power optimization according to the drop threshold, and performing power compensation to maintain the SOC value of the power battery.

[0045] The range extender intelligent power conservation control method based on power following in the embodiment of the present invention improves the range extender's performance in maintaining the power battery SOC when the vehicle has a continuous high power demand through the compensation coefficient. It forms a power compensation mechanism that is automatically triggered when the vehicle's power consumption continuously increases, and optimizes the intelligent power conservation function.

[0046] like Figure 1 As shown, in one embodiment of the present invention, step 100 includes:

[0047] Step 110: Collecting power battery operating parameters in real time from the CAN bus;

[0048] Step 120: forming a driving mode tracking according to the power battery operating condition parameters;

[0049] Step 130: Set a time statistical period according to the driving mode, and calculate the average power consumption within the time statistical period.

[0050] The operating parameters include but are not limited to the power battery SOC (remaining power state), voltage and current values. Based on the operating parameters of the power battery and the power distribution of the main power-consuming equipment during driving, as well as the perceived quantification of driving behavior, the driving mode is quantified and tracked during driving. The dynamic and rapidly changing power consumption of the whole vehicle during driving is combined with the environment and behavior to form a comprehensive calculation framework for power consumption. Based on the comprehensive calculation framework, the average power consumption within the time statistical period is calculated.

[0051] like Figure 1 As shown, in one embodiment of the present invention, step 200 includes:

[0052] Step 210: Compare the fixed-point power generation and the current average power consumption, and use the larger value as the candidate output power;

[0053] Step 220: Compare the alternative output power, the maximum charging power of the power battery and the rated output power of the range extender and take the smaller value as the target output power of the range extender.

[0054] After the range extender starts working, within the current statistical period, the alternative output power value first ensures that the fuel consumption corresponding to the range extender output power value is always stable above the range extender's optimal fuel consumption operating point (including the optimal fuel consumption operating point), simplifying the engine's fuel efficiency control process. This forms a unilateral filtering effect on the vehicle's fuel consumption, and forms a unilateral adjustment of the vehicle's fuel consumption based on the lowest fuel consumption operating point during the operation of the range extender, taking into account the vehicle's fuel consumption rate while ensuring the vehicle's electrical power.

[0055] When the vehicle is using low power, the range extender is used to supply and replenish the vehicle with fixed-point power. This ensures the lowest fuel consumption rate for the vehicle, and the power can cover the vehicle's power consumption and charge the battery to maximize the use of the power. When the vehicle is using high power, the current average power consumption is used to supply the vehicle and meet the vehicle's high power demand.

[0056] At the same time, the maximum power value allowed for charging of the power battery formed according to the power battery operating parameters (obtained by multiplying the voltage value and the maximum allowable charging current value at this time) and the smaller value of the range extender output power limit and the alternative output power are used as the target output power, which can effectively ensure the safety of the range extender and the power battery.

[0057] like Figure 1 As shown, in one embodiment of the present invention, step 300 includes:

[0058] Step 310: The range extender transmits electric power to the power battery according to the target output power in the next time statistical period;

[0059] Step 320: forming a target output power of the next time statistical period in a continuous time statistical period, so that the target output power of the next time statistical period follows the average power consumption of the power battery output in the previous time statistical period.

[0060] The range extender outputs the target output power in the next cycle to achieve the power following function between cycles. Specifically, the value is sent to the range extender controller through the CAN bus, so that it can be enabled at the right time, correctly output power between cycles, and perform power protection, unloading or shut down according to the charging conditions allowed by the power battery. It can meet the high-power power demand of the vehicle for the power battery. The SOC value of the power battery can be ensured not to decrease in a periodic power following manner to achieve the intelligent power conservation function.

[0061] like Figure 1 As shown, in one embodiment of the present invention, step 400 includes:

[0062] Step 410: Detecting a continuous increase trend of the average power consumption output by the power battery and a decrease trend of the SOC value of the power battery within a continuous time statistical period;

[0063] Step 420: When the SOC value decreases to a preset threshold, the target output power is optimized according to the compensation coefficient to keep the SOC value returning to the power conservation setting value.

[0064] The SOC reduction trend is quantified by a series of monotonic linear characteristics formed by monitoring data. When the output average power consumption continues to decrease rapidly, the optimization calculation process of the target output power is triggered by the preset threshold, forming additional power compensation, and gradually increasing the SOC value of the power battery to the preset safety range. The SOC value of the whole vehicle is returned to the power conservation setting value, realizing the intelligent power conservation function.

[0065] The simulation results of the intelligent power conservation control method for range extender based on power following according to an embodiment of the present invention are as follows: Figure 2 As shown. Figure 2 In the embodiment, the intelligent power conservation control method for the range extender based on power following of the above embodiment is input into the simulated working condition for software-in-the-loop simulation. The upper curve is the input working condition curve, the middle curve is the power following calculation result of the range extender, and the lower curve is the final power output curve of the range extender. It can be seen that when the simulated working condition is more complex and the sudden change in power consumption is large and frequent, the controlled range extender can realize the optimal fuel consumption working point and the two output modes of power following during the cycle and switch in time. And the periodic power following can avoid the synchronous sudden change in the output power of the range extender caused by the sudden change in the power consumption of the whole vehicle, so that its power output changes are relatively stable, which verifies the core function of the present invention.

[0066] An intelligent power conservation control device for a range extender based on power following according to an embodiment of the present invention comprises:

[0067] A memory, used to store program codes in the process of processing the intelligent power conservation control method for a range extender based on power following in the above-mentioned embodiment;

[0068] A processor is used to execute the program code in the processing of the intelligent power conservation control method for a range extender based on power following in the above-mentioned embodiment.

[0069] The processor may be a DSP (Digital Signal Processor) digital signal processor, an FPGA (Field-Programmable Gate Array) field programmable gate array, an MCU (Microcontroller Unit) system board, a SoC (system on a chip) system board, or a PLC (Programmable Logic Controller) minimum system including I / O.

[0070] An intelligent power conservation control device for a range extender based on power following according to an embodiment of the present invention is as follows Figure 3 As shown. Figure 3 In this embodiment, the present invention comprises:

[0071] The data collection module 10 is used to form the average power consumption in the time statistical period during the vehicle driving process;

[0072] The data processing module 20 is used to form the target output power of the range extender according to the matching rule between the fixed-point power generation power at the range extender's optimal fuel consumption operating point and the current average power consumption;

[0073] The power output module 30 is used to follow the average power consumption output by the power battery with the target output power of the range extender in a subsequent time statistical period.

[0074] like Figure 3 As shown, in one embodiment of the present invention, the data acquisition module 10 includes:

[0075] The operating condition acquisition unit 11 is used to collect the power battery operating condition parameters from the CAN bus in real time;

[0076] A calculation framework unit 12, used for forming a driving mode tracking according to the power battery operating condition parameters;

[0077] The power calculation unit 13 is used to set a time statistical period according to the driving mode and calculate the average power consumption within the time statistical period.

[0078] like Figure 3 As shown, in one embodiment of the present invention, the data processing module 20 includes:

[0079] A power comparison unit 21 is used to compare the fixed-point power generation with the current average power consumption, and use the larger value as the alternative output power;

[0080] The output limiting unit 22 is used to compare the alternative output power, the maximum charging power of the power battery and the rated output power of the range extender and take the smaller value as the target output power of the range extender.

[0081] like Figure 3As shown, in one embodiment of the present invention, the power output module 30 includes:

[0082] The delay follower unit 31 is used to form a range extender to transmit electric power to the power battery according to the target output power in the next time statistical period;

[0083] The continuous following unit 32 is used to form a target output power of the next time statistical period to follow the average power consumption change of the power battery output in the previous time statistical period within the continuous time statistical period.

[0084] like Figure 3 As shown, in one embodiment of the present invention, it also includes:

[0085] The power optimization module 40 is used to set a SOC value drop threshold of the power battery, trigger the target output power optimization according to the drop threshold, and perform power compensation to maintain the SOC value of the power battery.

[0086] like Figure 3 As shown, in one embodiment of the present invention, the power optimization module 40 includes:

[0087] A trend judgment unit 41 is used to detect a continuous increase trend of the average power consumption output by the power battery within a continuous time statistical period and a return of the SOC value of the power battery to a power conservation setting value;

[0088] The optimization implementation unit 42 is used to optimize the target output power according to the compensation coefficient when the SOC value decreases to a preset threshold value, so as to keep the SOC value tending to a preset safety range.

[0089] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A range extender intelligent power conservation control method based on power following, characterized in that: include: The average power consumption in the time statistical period during the vehicle driving process is formed; The target output power of the range extender is formed according to the matching rule between the fixed-point power generation power at the range extender's optimal fuel consumption operating point and the current average power consumption; In the subsequent statistical period, the target output power of the range extender is used to follow the average power consumption output by the power battery.

2. The intelligent power conservation control method for range extender based on power following as claimed in claim 1, characterized in that: The formation of the average power consumption includes: Collect power battery operating parameters in real time from CAN bus; Driving mode tracking is formed according to the power battery operating parameters; The time statistical period is set according to the driving mode, and the average power consumption within the time statistical period is calculated.

3. The intelligent power conservation control method for range extender based on power following as claimed in claim 1, characterized in that: The forming of the range extender target output power comprises: Compare the fixed-point power generation with the current average power consumption, and use the larger value as the alternative output power; Compare the alternative output power, the maximum charging power of the power battery and the rated output power of the range extender and take the smaller value as the target output power of the range extender.

4. The intelligent power conservation control method for range extender based on power following as claimed in claim 1, characterized in that: The forming of power following the power battery output comprises: In the next time statistical period, the range extender transmits electric power to the power battery according to the target output power; In a continuous time statistical period, the target output power of the next time statistical period follows the average power consumption output by the power battery of the previous time statistical period.

5. The intelligent power conservation control method for range extender based on power following as claimed in claim 1, characterized in that: Also includes: Set the SOC value drop threshold of the power battery, trigger the target output power optimization according to the drop threshold, and perform power compensation to maintain the SOC value of the power battery.

6. The intelligent power conservation control method for range extender based on power following as claimed in claim 5, characterized in that: The performing of power compensation to maintain the SOC value of the power battery includes: Detect the continuous increase trend of the average power consumption output by the power battery and the decrease trend of the SOC value of the power battery within the continuous time statistical period; When the SOC value drops to a preset threshold, the target output power is optimized according to the compensation coefficient to keep the SOC value returning to the power conservation setting value.

7. An intelligent power conservation control device for a range extender based on power following, characterized in that: include: A memory, used to store program codes in the process of processing the intelligent power conservation control method for a range extender based on power following as claimed in any one of claims 1 to 6; A processor is used to execute the program code.

8. An intelligent power conservation control device for a range extender based on power following, characterized in that: include: A data collection module is used to form the average power consumption within a time statistical period during the vehicle's driving process; A data processing module, used for forming a target output power of the range extender according to a matching rule between a fixed-point power generation power at an optimal fuel consumption operating point of the range extender and a current average power consumption; The power output module is used to follow the average power consumption output by the power battery with the target output power of the range extender in the subsequent time statistical period.

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