A custom energy management and control method for range-extended electric vehicles

Abstract

This invention discloses a range-extended electric vehicle (REEV) customized energy management and control method, comprising the following steps: Step S10, the vehicle is powered on, and the vehicle enters a Ready state capable of receiving high voltage; Step S20, after the customer predicts the required electricity demand, they select the required power generation capacity through a human-machine interface according to their desired power generation duration. The VCU executes the customer's request and instructs the RCU to generate electricity according to the required power; Step S30, when the VCU determines the current power generation capacity P... input After the demand is received, the total power P currently used by the vehicle will be determined. total The current allowable charging power P of the battery charge The maximum power output P1 that the range extender can currently generate is logically determined. This invention avoids unnecessary energy waste and improves the efficiency of the range extender by accurately predicting power demand and intelligently adjusting the power generation strategy. In the above, the low power P0 is assumed to be the initial power generation value.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle control technology. Specifically, this invention relates to a range-extended vehicle customized energy management control method. Background Technology

[0002] With the increasing penetration rate of new energy vehicles, pure electric vehicles have advantages in driving performance and low energy consumption costs, but they also suffer from range anxiety. Therefore, hybrid vehicles, which combine low energy consumption and long range, have seen a significant increase in market share in the past two years. Among them, plug-in range-extended electric vehicles are a type of hybrid new energy vehicle. They are closer to pure electric vehicles in terms of attributes, and they use electricity for the vast majority of the time. They usually have lower energy consumption costs than other hybrid vehicles, and the range extender is mostly used temporarily to solve customers' range anxiety.

[0003] Commercial vehicles are heavy and have high power requirements, so the demand for battery power in new energy commercial vehicles is increasing, and range anxiety is becoming more pronounced. Many automakers are developing and launching range-extended commercial vehicles with large battery capacities. In terms of energy management, when the vehicle's state of charge (SOC) drops to the design limit, the range extender system will be controlled to intervene and supplement the power to the battery and drive motor to maintain continuous driving and a certain amount of power. Since this method is automatically executed by the vehicle's VCU (vehicle controller) according to the set strategy to start the range extender system to generate electricity, it can be called active power generation control mode.

[0004] In actual use, commercial vehicle customers will face many complex scenarios. The weight, mileage, and delivery time of the order may be random, the route may be planned on the spot, and the charging facilities on the route are also determined according to the route.

[0005] Due to the numerous uncertainties surrounding the aforementioned commercial vehicle orders, covering all usage scenarios and ensuring a balance between low operating costs and efficiency requires identifying a large number of different order parameters and route data. Based on the previously mentioned active power generation mode, it is clearly impossible to implement a comprehensive energy management and control strategy at present. Summary of the Invention

[0006] This invention provides a range-extended customized energy management and control method, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a range-extended customized energy management and control method, comprising the following steps:

[0008] Step S10: The vehicle is powered on, and the entire vehicle enters the Ready state, which is capable of receiving high voltage.

[0009] Step S20: After the customer predicts the electricity demand, they select the power generation power they need through the human-machine interface according to their desired power generation duration. The VCU executes the customer's request and instructs the RCU to generate electricity according to the required power.

[0010] Step S30, when the VCU determines the current power generation P input After the demand is received, the total power P currently used by the vehicle will be determined. total The current allowable charging power P of the battery charge The logic is used to determine the maximum power P1 that the range extender can currently generate.

[0011] Step S40, when the range extender assembly controller RCU receives the final adjusted power value P input Then, the actual power generation is calculated through EMS and GCU, and sent to the vehicle instrument panel for display through the vehicle's CAN network;

[0012] In step S50, after receiving a termination signal from the customer, the VCU and RCU exit the power generation mode.

[0013] Preferably, step S20 includes the following steps:

[0014] Step S21: The customer first enters REV mode via the mode switch;

[0015] Step S22: After entering REV mode, the customer selects the power generation capacity through the power adjustment switch or the power selection interface in REV mode.

[0016] Step S23: After receiving the input, the VCU enters the REV custom power generation mode, and first uses the default power as the initial power generation value.

[0017] Step S24: Determine whether the required power value has been stable for 4 seconds. If so, the VCU will use this power value P0 as the latest power target input value. Otherwise, the VCU will not respond and will repeat the judgment.

[0018] Preferably, step S30 includes the following steps:

[0019] Step S31, power generation demand P input And the total power currently used by the vehicle P total In comparison, judging P input ≤P total If the condition is true, proceed to step S311; otherwise, proceed to step S321.

[0020] Step S311, determine P input If ≤P1 is true, then use P. input=The initial value of P0 is used as the final input power value for GCU execution; otherwise, P is used. input =P1 value is used as the input power value for the final GCU execution;

[0021] Step S321, determine P input ≤P1 is true, then determine P. input -P total ≤P charge Whether it is true or not, if P input ≤P1 and P input -P total ≤P charge Then use P input =P0 initial value is used as the final input power value executed by GCU, if P input ≤P1 and P input -P total >P charge Then use P input =P total +P charge The value is used as the final input power value for the GCU execution. If P input >P1 and P input -P total ≤P charge Then use P input =P1 value is used as the final input power value for GCU execution, if P input >P1 and P input -P total >P charge Then use P input =P total +P charge The value is used as the input power value for the final GCU execution.

[0022] Preferably, step S40 includes the following steps:

[0023] Step S41, when the range extender assembly controller RCU receives the final adjusted power value P input Afterwards, the RCU will coordinate the range extender engine control unit (EMS) and the range extender generator control unit (GCU) to complete the power generation work at the customized power level.

[0024] Step S42: According to the instructions from the GCU and RCU, the generator controller first starts the motor to back-drive the engine to near the set speed. The engine control unit (EMS) completes the fuel injection and ignition work near this speed, completing the idle start of the engine. After the range extender assembly completes the idle start, it enters the idle mode.

[0025] Step S43: After the RCU successfully completes the idle start of the range extender assembly, execute the P input from the VCU. inputThe power command selects a suitable power generation point based on the optimal map calibrated on the range extender assembly bench. The GCU controls the generator to pull the engine crankshaft, gradually increasing or decreasing the speed to the selected power generation point. At this point, speed control can be used to maintain a steady state. Due to the engine's drive, the generator controlled by the GCU generates electricity at a constant speed at this power point.

[0026] In step S44, the GCU needs to calculate the actual power generation based on the current actual power generation current and send it to the vehicle instrument panel for display via the vehicle's CAN network, so that customers can understand the current power generation status and adjust the power or exit the custom power generation mode at any time.

[0027] The beneficial effects of adopting the above technical solutions are:

[0028] I. Improve energy efficiency: By accurately predicting electricity demand and intelligently adjusting power generation strategies, unnecessary energy waste is avoided, and the efficiency of the range extender is improved.

[0029] II. Enhanced User Experience: Users can flexibly adjust the power generation control strategy according to their own driving plans and needs to achieve a personalized power replenishment experience.

[0030] 3. Extend vehicle range: By rationally allocating power and generating time, range anxiety caused by insufficient power is effectively alleviated, and the safety and reliability of long-distance driving are improved. Attached Figure Description

[0031] Figure 1 This is the overall logic control flowchart provided by the present invention;

[0032] Figure 2 This is the logic control flowchart for step S20;

[0033] Figure 3 This is the logic control flowchart for step S30;

[0034] Figure 4 This is the logic control flowchart for step S40;

[0035] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0036] Specifically, such as Figures 1 to 4 As shown, a range-extended electric vehicle (REEV) customized energy management and control method includes the following steps:

[0037] Step S10: The vehicle is powered on, and the entire vehicle enters the Ready state, which is capable of receiving high voltage.

[0038] Step S20: After the customer predicts the electricity demand, they select the power generation power they need through the human-machine interface according to their desired power generation duration. The VCU executes the customer's request and instructs the RCU to generate electricity according to the required power.

[0039] Step S30, when the VCU determines the current power generation P input After the demand is received, the total power P currently used by the vehicle will be determined. total The current allowable charging power P of the battery charge The logic is used to determine the maximum power P1 that the range extender can currently generate.

[0040] Step S40, when the range extender assembly controller RCU receives the final adjusted power value P input Then, the actual power generation is calculated through EMS and GCU, and sent to the vehicle instrument panel for display through the vehicle's CAN network;

[0041] In step S50, after receiving a termination signal from the customer, the VCU and RCU exit the power generation mode.

[0042] It should be noted that the main purpose of this invention is to allow customers to estimate the amount of electricity they need to replenish from the range extender based on their current battery level and cargo load, as well as the distribution of charging facilities along their planned route. By controlling the power generation and duration of the range extender, customers can achieve fully customized power generation control. Specifically, after predicting the required electricity, customers select the desired power generation capacity through a human-machine interface (such as a large screen) based on their desired power generation duration. The vehicle controller (hereinafter referred to as VCU) executes the customer's request and instructs the range extender assembly controller (hereinafter referred to as RCU) to generate electricity at the required power. The RCU coordinates the engine and generator to generate electricity at the optimal power generation point to replenish the vehicle's electrical energy. When the customer inputs a termination signal, the VCU and RCU exit the power generation mode.

[0043] In addition, after the vehicle is powered on, a vehicle fault detection is first performed to determine whether each function is normal. If all functions are normal, the customer can follow the normal start-up procedure and the vehicle will enter the Ready state, which is capable of receiving high voltage. Otherwise, it will enter the relevant fault mode. After normal power-on Ready, the vehicle will enter the set default or memory mode state, such as EV pure electric mode, HEV hybrid mode, and REV custom power generation mode. If the customer chooses to use custom power generation, the customer needs to enter the custom power generation mode first.

[0044] Step S20 includes the following steps:

[0045] Step S21: The customer first enters REV mode via the mode switch;

[0046] Step S22: After entering REV mode, the customer selects the power generation capacity through the power adjustment switch or the power selection interface in REV mode.

[0047] Step S23: After receiving the input, the VCU enters the REV custom power generation mode, and first uses the default power as the initial power generation value.

[0048] Step S24: Determine whether the required power value has been stable for 4 seconds. If so, the VCU will use this power value P0 as the latest power target input value. Otherwise, the VCU will not respond and will repeat the judgment.

[0049] It should be noted that customers first enter the custom power generation mode (REV mode) through the mode switch. This command signal can be selected through hardware button signals, such as the instrument panel button switch; or CAN signal, such as the vehicle mode interface on the MP5 screen.

[0050] In addition, the purpose of step S24 is to prevent the client from continuously changing power requirements and causing engine and other malfunctions due to frequent power point adjustments of the range extender assembly in a short period of time.

[0051] Step S30 includes the following steps:

[0052] Step S31, power generation demand P input And the total power currently used by the vehicle P total In comparison, judging P input ≤P total If the condition is true, proceed to step S311; otherwise, proceed to step S321.

[0053] Step S311, determine P input If ≤P1 is true, then use P. input =The initial value of P0 is used as the final input power value for GCU execution; otherwise, P is used. input =P1 value is used as the input power value for the final GCU execution;

[0054] Step S321, determine P input ≤P1 is true, then determine P. input -P total ≤P charge Whether it is true or not, if P input ≤P1 and P input -P total ≤P charge Then use P input =P0 initial value is used as the final input power value executed by GCU, if P input ≤P1 and P input -P total >P chargeThen use P input =P total +P charge The value is used as the final input power value for the GCU execution. If P input >P1 and P input -P total ≤P charge Then use P input =P1 value is used as the final input power value for GCU execution, if P input >P1 and P input -P total >P charge Then use P input =P total +P charge The value is used as the input power value for the final GCU execution.

[0055] It should be noted that P in step 30 input The final VCU input value can be either the value obtained above or a value close to the above, whichever is more economical in the range extender's MAP.

[0056] Step S40 includes the following steps:

[0057] Step S41, when the range extender assembly controller RCU receives the final adjusted power value P input Afterwards, the RCU will coordinate the range extender engine control unit (EMS) and the range extender generator control unit (GCU) to complete the power generation work at the customized power level.

[0058] Step S42: According to the instructions from the GCU and RCU, the generator controller first starts the motor to back-drive the engine to near the set speed. The engine control unit (EMS) completes the fuel injection and ignition work near this speed, completing the idle start of the engine. After the range extender assembly completes the idle start, it enters the idle mode.

[0059] Step S43: After the RCU successfully completes the idle start of the range extender assembly, execute the P input from the VCU. input The power command selects a suitable power generation point based on the optimal map calibrated on the range extender assembly bench. The GCU controls the generator to pull the engine crankshaft, gradually increasing or decreasing the speed to the selected power generation point. At this point, speed control can be used to maintain a steady state. Due to the engine's drive, the generator controlled by the GCU generates electricity at a constant speed at this power point.

[0060] In step S44, the GCU needs to calculate the actual power generation based on the current actual power generation current and send it to the vehicle instrument panel for display via the vehicle's CAN network, so that customers can understand the current power generation status and adjust the power or exit the custom power generation mode at any time.

[0061] It should be noted that if the engine fails to start or run during steps S42 and S43, continuous starting attempts will be made until the set maximum number of starts is reached, at which point further starting attempts will cease. The RCU will report a VCU start failure fault. The VCU will exit the current custom power generation mode, upload a fault code, and display a notification on the instrument panel.

[0062] In addition, when a new fixed-point generator power is input, the RCU will control the range extender assembly to adjust the power, which can be done according to a certain engine speed gradient, such as 500 rpm / s, to ensure NVH and other requirements.

[0063] Meanwhile, upon receiving a request to exit the REV custom power generation mode, the RCU controls the range extender EMS and MCU unit to complete the power change or shutdown of the range extender assembly, depending on whether the customer selects hybrid HEV mode or pure electric EV mode after exiting.

[0064] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A range-extended customized energy management and control method, characterized in that, Includes the following steps: Step S10: The vehicle is powered on, and the entire vehicle enters the Ready state, which is capable of receiving high voltage. Step S20: After the customer predicts the electricity demand, they select the power generation power they need through the human-machine interface according to their desired power generation duration. The VCU executes the customer's request and instructs the RCU to generate electricity according to the required power. Step S30, when the VCU determines the current power generation P input After the demand is received, the total power P currently used by the vehicle will be determined. total The current allowable charging power P of the battery charge The logic is used to determine the maximum power P1 that the range extender can currently generate. Step S40, when the range extender assembly controller RCU receives the final adjusted power value P input Then, the actual power generation is calculated through EMS and GCU, and sent to the vehicle instrument panel for display through the vehicle's CAN network; Step S50: Upon receiving a termination signal from the customer, the VCU and RCU exit the power generation mode. Step S30 includes the following steps: Step S31, power generation demand P input And the total power currently used by the vehicle P total In comparison, judging P input ≤P total If the condition is true, proceed to step S311; otherwise, proceed to step S321. Step S311, determine P input If ≤P1 is true, then use P. input =The initial value of P0 is used as the final input power value for GCU execution; otherwise, P is used. input =P1 value is used as the input power value for the final GCU execution; Step S321, determine P input ≤P1 is true, then determine P. input -P total ≤P charge Whether it is true or not, if P input ≤P1 and P input -P total ≤P charge Then use P input =P0 initial value is used as the final input power value executed by GCU, if P input ≤P1 and P input -P total >P charge Then use P input =P total +P charge The value is used as the final input power value for the GCU execution. If P input >P1 and P input -P total ≤P charge Then use P input =P1 value is used as the final input power value for GCU execution, if P input >P1 and P input -P total >P charge Then use P input =P total +P charge The value is used as the input power value for the final GCU execution; Step S40 includes the following steps: Step S41: After the range extender assembly controller RCU receives the final adjusted power value Pinput, the RCU will coordinate with the range extender engine control unit EMS and the range extender generator control unit GCU to complete the power generation work of the customized power. Step S42: According to the instructions from the GCU and RCU, the generator controller first starts the motor to back-drive the engine to near the set speed. The engine control unit (EMS) completes the fuel injection and ignition work near this speed, completing the idle start of the engine. After the range extender assembly completes the idle start, it enters the idle mode. Step S43: After the RCU successfully completes the idle start of the range extender assembly, it executes the Pinput power command input by the VCU. According to the optimal Map calibrated on the range extender assembly bench, it selects a suitable power generation point. The GCU controls the generator to pull the engine crankshaft and gradually increase or decrease the speed to the selected power generation point. At this point, speed control can be used to maintain a steady state. Due to the engine's drive, the generator controlled by the GCU generates electricity at a constant speed at this power point. In step S44, the GCU needs to calculate the actual power generation based on the current actual power generation current and send it to the vehicle instrument panel for display via the vehicle's CAN network, so that customers can understand the current power generation status and adjust the power or exit the custom power generation mode at any time.

2. The range-extended customized energy management and control method according to claim 1, characterized in that: Step S20 includes the following steps: Step S21: The customer first enters REV mode via the mode switch; Step S22: After entering REV mode, the customer selects the power generation capacity through the power adjustment switch or the power selection interface in REV mode. Step S23: After receiving the input, the VCU enters the REV custom power generation mode, and first uses the default power as the initial power generation value. Step S24: Determine whether the required power value has been stable for 4 seconds. If so, the VCU will use this power value P0 as the latest power target input value. Otherwise, the VCU will not respond and will repeat the judgment.

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