Electric light truck type energy recovery control method

Abstract

The invention discloses an electric light truck type energy recovery control method, which has the main design concept that an energy recovery torque instruction is dynamically implemented and adjusted by comparing battery pack recovery power with accessory electric power. Specifically, different vehicle working conditions are judged, and when a battery pack is in a suitable state, the recovery efficiency is efficiently improved to increase the endurance mileage of the electric light truck through a theoretical allowable power calculated through a battery pack request and an accessory electric power superposition scheme; and when the allowable recovery power of the battery pack under the special working condition is relatively low, the superposition of the electric power of the accessories is cancelled, and instruction issuing is performed only aiming at the allowable recovery power of the battery pack so as to reduce the current impact. The energy recovery strategy is adjusted in time according to the actual working condition of the vehicle, the recovery efficiency is improved, the endurance mileage is increased, and meanwhile the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to an energy recovery control method for an electric light truck. Background Art

[0002] The driving range of electric light trucks has always been a pain point in the industry, and improving it is an urgent market need. Energy recovery is widely used as an effective means of improving this. Energy recovery involves converting the motor into a generator when the vehicle decelerates or brakes, converting some of the kinetic energy into electrical energy and storing it in the battery, reducing the need for external charging and extending driving range.

[0003] However, when the motor's energy is recovered and recharged back into the battery, the battery's allowable recharge current must be considered. A recharge current that is too low results in low recovery efficiency and energy loss, while a recharge current that is too high can cause overcurrent and damage the battery pack.

[0004] For example, when the battery is at a high SOC or low temperature (such as <0°C), the battery's allowable recovery power is reduced, which can easily cause a recharge overcurrent fault. Summary of the Invention

[0005] In view of the above, the present invention aims to provide an energy recovery control method for an electric light truck to solve the above-mentioned technical problems.

[0006] The technical solution adopted in the present invention is as follows:

[0007] The present invention provides an energy recovery control method for an electric light truck, which includes:

[0008] After the preset conditions are met, it enters the energy recovery mode;

[0009] Calculate the current battery allowable recharge power;

[0010] Calculate the total power consumption of the vehicle's running accessories;

[0011] Dynamically adjust the energy recovery instruction based on the comparison between the battery's allowed recharge power and the total power consumption;

[0012] Energy recovery is performed according to the issued instruction.

[0013] In at least one possible implementation method, the dynamic adjustment of energy recovery instruction includes: if the battery allows the recharging power greater than a predetermined multiple of the total power consumption, then a recovery instruction is generated based on the superposition result of the battery allows the recharging power and the total power consumption.

[0014] In at least one possible implementation, the dynamic adjustment of the energy recovery instruction includes: if the battery's allowed recharge power is less than a predetermined multiple of the total power consumption, generating a recovery instruction based only on the battery's allowed recharge power.

[0015] In at least one possible implementation method, the dynamic adjustment of energy recovery instruction includes: if the battery allows the recharging power = a predetermined multiple of the total power consumption, then after triggering several accessories in operation to pause, the total power consumption is updated and re-compared to decide how to generate the recovery instruction.

[0016] In at least one possible implementation, the issuing instruction includes at least a motor torque parameter and an energy recovery time;

[0017] The performing of energy recovery according to the issued instruction includes: performing power generation recovery control based on the motor torque parameter and the energy recovery duration.

[0018] In at least one possible implementation, obtaining the current allowable battery recharging power includes calculating the allowable battery recharging power based on the current SOC and / or current environmental parameters, the allowable battery pulse recharging current, and the current battery voltage.

[0019] In at least one possible implementation manner, the preset condition at least includes: the entire vehicle is in a braking or coasting condition.

[0020] Compared to existing technologies, the present invention's key design concept lies in dynamically adjusting the energy recovery torque command by comparing the battery pack's recovery power with the accessory power consumption. Specifically, this approach is tailored to different vehicle operating conditions. When the battery pack is in an appropriate state, the theoretically permitted power calculated by the battery pack and the accessory power consumption are combined, effectively improving recovery efficiency and increasing the electric light truck's range. However, when the battery pack is operating under specific conditions where the permitted recovery power is low, the accessory power addition is eliminated, and only the permitted recovery power is issued to minimize current surges. This invention adjusts the energy recovery strategy based on the vehicle's actual operating conditions, improving recovery efficiency and increasing range while extending the battery pack's service life.

[0021] In particular, the present invention incorporates an unconventional control logic design for the compared critical operating conditions in a preferred embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0023] Figure 1A schematic diagram of an energy recovery control method for an electric light truck provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0025] The present invention proposes an embodiment of an energy recovery control method for an electric light truck. Specifically, Figure 1 shown, including:

[0026] Step S1: After the preset conditions are met, enter the energy recovery mode;

[0027] The pre-conditions here include at least: detecting that the vehicle is in a braking or coasting condition.

[0028] Step S2: Calculate the current battery recharge power allowed;

[0029] For example, the allowable recharge power of the battery at this time can be calculated by the battery allowable pulse recharge current preset in the BMS (battery management system) according to the current SOC and / or current environmental parameters (such as temperature, etc.) and the current battery voltage.

[0030] Step S3: Calculate the total power consumption of the running accessories of the vehicle (power required by the accessories);

[0031] Step S4: dynamically adjusting the energy recovery instruction based on the comparison between the battery's allowed recharge power and the total power consumption;

[0032] To elaborate, on the one hand, if the recharge power allowed by the BMS is greater than (a predetermined multiple, which can be calibrated), for example, 2*accessory power consumption, it is preferred to generate a recovery instruction by adding the superposition value of the BMS allowed recharge power and the accessory power; on the other hand, if the BMS allowed recharge power is less than 2*accessory power, then the recovery instruction is generated only according to the calculated battery allowed recharge power; on the other hand, the present invention takes into account the critical state. According to the above example, when the allowed recharge power = 2*accessory power, the conventional idea is to be on the safe side and adopt a conservative strategy to generate a recovery instruction only according to the obtained allowed recharge power. However, in some preferred embodiments of the present invention, it is believed that being in a critical state indicates that the current battery operating condition There is a specificity, so it is proposed to trigger the suspension of some accessories in the operation of the vehicle at this time (those skilled in the art can understand that the accessories that are temporarily suspended must be accessories that do not affect the safe driving of the vehicle, and the duration of this temporary suspension is only for the energy recovery stage, rather than a long-term stop. The suspended accessories are restarted after exiting energy recovery. Therefore, the recovery instruction can also include control parameters for the recovery time, such as the energy recovery time) and update the total power consumption. After recalculation and comparison, the method of generating the recovery instruction is decided. This preferred embodiment is to consider the given critical state, and try to ensure the efficient completion of battery pack recharging and improve the cruising range of light trucks as the best choice.

[0033] Step S5: Execute energy recovery according to the issued instruction.

[0034] Specifically, a torque command is sent to the motor controller MCU in the previous step, and then power generation recovery control is executed according to the torque command.

[0035] In summary, the main design concept of the present invention is to dynamically adjust the energy recovery torque command by comparing the battery pack's recovery power and the accessory power consumption. Specifically, a judgment is made based on different vehicle operating conditions. When the battery pack is in an appropriate state, the theoretically allowed power calculated by the battery pack request and the accessory power consumption are superimposed, effectively improving recovery efficiency and increasing the range of the electric light truck. When the battery pack is in a special operating condition where the allowed recovery power is low, the superposition of the accessory power consumption is eliminated, and only the recovery power allowed by the battery pack is commanded to reduce current surges. The present invention adjusts the energy recovery strategy in a timely manner according to the actual vehicle operating conditions, improving recovery efficiency and increasing range while extending the battery pack's service life.

[0036] If the expressions expressing directions are mentioned in the embodiments of the present invention, they are relative concepts based on the embodiments. In addition, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c or a, b and c, where a, b, c can be single or multiple.

[0037] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred modes can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A method for controlling energy recovery in an electric light truck, characterized in that: include: After the preset conditions are met, it enters the energy recovery mode; Calculate the current battery allowable recharge power; Calculate the total power consumption of the vehicle's running accessories; Dynamically adjust the energy recovery instruction based on the comparison between the battery's allowed recharge power and the total power consumption; Energy recovery is performed according to the issued instruction.

2. The energy recovery control method for electric light trucks according to claim 1, characterized in that: The dynamically adjusting the energy recovery instruction includes: if the battery allowed recharge power is greater than a predetermined multiple of the total power consumption, generating a recovery instruction based on the superposition result of the battery allowed recharge power and the total power consumption.

3. The energy recovery control method for electric light trucks according to claim 1, characterized in that: The dynamically adjusting the energy recovery instruction includes: if the battery's allowed recharge power is less than a predetermined multiple of the total power consumption, generating a recovery instruction based only on the battery's allowed recharge power.

4. The energy recovery control method for electric light trucks according to claim 1, characterized in that: The dynamic adjustment of energy recovery instructions includes: if the battery allows recharging power = a predetermined multiple of the total power consumption, then after triggering several accessories in operation to pause, the total power consumption is updated and re-compared to decide how to generate the recovery instruction.

5. The energy recovery control method for electric light trucks according to claim 4, characterized in that: The issued instruction includes at least a motor torque parameter and an energy recovery time; The performing of energy recovery according to the issued instruction includes: performing power generation recovery control based on the motor torque parameter and the energy recovery duration.

6. The energy recovery control method for electric light trucks according to claim 1, characterized in that: The obtaining of the current allowable battery recharge power includes: calculating the allowable battery recharge power according to the current SOC and / or the current environmental parameters, the allowable battery pulse recharge current preset, and the current battery voltage.

7. The energy recovery control method for an electric light truck according to any one of claims 1 to 6, characterized in that: The preset conditions at least include: the vehicle is in a braking or coasting condition.

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