An adaptive control method and system for a REV vehicle engine heating battery pack

Abstract

The present invention relates to the field of new energy vehicle control technology, and specifically to an adaptive control method and system for a REV vehicle engine heating battery pack. An intelligent control algorithm is proposed, which corrects the engine output power in the next time period based on the battery pack temperature change rate in the current time period, and self-learns the correction coefficient based on the magnitude of the battery pack temperature change rate in the next time period, so that the engine heat can be effectively used to increase the battery pack temperature, improve the engine energy utilization rate, and extend the service life of the PTC. By providing an adaptive processor, memory, and signal acquisition system, the ambient temperature value, battery pack temperature value, and engine power value can be collected in real time and processed and calculated, and then the engine controller is used to control the engine output power in real time. Through a plate heat exchanger, the engine waste heat can be used to heat the battery pack in a low-temperature environment, which is more energy-efficient.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle control technology, and in particular to an adaptive control method and system for a REV vehicle engine heating battery pack. Background Art

[0002] With the development of new energy technologies, REV (hybrid) vehicles have become a major force in the vehicle market. Their energy-saving and low-emission features have attracted significant attention in the automotive industry and have become a key focus of automotive research and development. Traditional REV vehicles are powered by a combination of an internal combustion engine and an electric motor, with the electric motor primarily drawing power from an onboard battery pack. The battery pack charge level in REV vehicles is significantly affected by temperature, particularly in low-temperature environments. As the ambient temperature decreases, the battery pack's charge loss rate increases significantly, severely impacting vehicle range.

[0003] The engine and electric motor of existing REV models usually work separately. In low-temperature environments, the battery pack is mainly heated by the PTC (heater) in conjunction with the circulating water circuit. The comprehensive control of engine power and battery pack temperature is not considered, resulting in waste of engine waste heat and a short service life of the PTC. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide an adaptive control method and system for the engine heating battery pack of a REV vehicle model, which can use the engine waste heat to heat the battery pack in a low-temperature environment, and at the same time intelligently control the engine power according to the battery pack temperature, so that the engine thermal energy can be used most efficiently, the engine energy efficiency can be improved, and the use of PTC can be reduced, thereby extending the service life of PTC.

[0005] To solve the above technical problems, the present invention adopts a technical solution: an adaptive control method for engine heating battery pack of REV vehicle model, comprising the following steps:

[0006] S1, determining whether the ambient temperature is lower than the preset battery pack efficient operating temperature, if so, executing step S2, if not, the adaptive control method does not work;

[0007] S2, determine whether the engine is started, if so, execute step S3, if not, the adaptive control method does not work;

[0008] S3, detect the temperature change rate of the battery pack △K during the Tn period Tn ;

[0009] S4, control the engine output power W during the Tn+1 period Tn+1 =(1-△K Tn )×W Tn ×Yn , where Y n is the correction coefficient corresponding to the Tn time period, W Tn is the engine output power during the Tn period;

[0010] S5, detect the temperature change rate of the battery pack △K during the Tn+1 period Tn+1 ;

[0011] S6, judge △K Tn+1 Is it less than △K Tn If so, let the correction coefficient Y corresponding to the Tn+1 time period be n+1 =2Y n If not, then let the correction coefficient corresponding to the Tn+1 time period be

[0012] S7, set n=n+1, and re-execute step S1.

[0013] Furthermore, in step S1, the ambient temperature value is collected by a vehicle external temperature sensor, and the preset battery pack efficient operating temperature is pre-input into the adaptive processor, and the preset battery pack efficient operating temperature is specifically 25°C.

[0014] Furthermore, in step S2, the engine start signal is collected by an engine controller.

[0015] Furthermore, in step S3, the temperature change rate of the battery pack is collected by a battery pack temperature sensor and calculated by an adaptive processor.

[0016] Furthermore, in step S4, the engine output power is controlled by an engine controller.

[0017] Furthermore, the detection process and the judgment process are both performed in an adaptive processor.

[0018] An engine control system adopting the adaptive control method as described above includes: an engine controller, an adaptive processor and a plate heat exchanger, wherein the engine controller is electrically connected to the adaptive processor and is used to receive signals from the adaptive processor and control the engine output power; the adaptive processor is provided with a memory, and the adaptive processor is electrically connected to a signal acquisition system; one end of the plate heat exchanger is connected to the engine circulating water circuit, and the other end is connected to the battery pack circulating water circuit, and is used to transfer heat from the engine circulating water circuit to the battery pack circulating water circuit.

[0019] Furthermore, the signal acquisition system includes:

[0020] The vehicle's external temperature sensor is located at the head of the vehicle and is used to collect real-time ambient temperature values;

[0021] The battery pack temperature sensor is located on the outer surface of the battery pack and is used to collect the real-time temperature value of the battery pack;

[0022] The power sensor is provided in the engine controller and is used to collect the real-time power value of the engine.

[0023] Furthermore, the engine circulating water circuit and the battery pack circulating water circuit are both provided with an electronically controlled pump and an electronically controlled valve.

[0024] A vehicle includes the engine control system described above.

[0025] Compared with the prior art, the present invention has the following main advantages:

[0026] 1. An intelligent control algorithm is proposed to correct the engine output power in the next time period based on the battery pack temperature change rate in the current time period. The correction coefficient is self-learned based on the battery pack temperature change rate in the next time period. This allows the engine heat to be effectively used to increase the battery pack temperature, improve the engine energy utilization rate, and minimize the use frequency of the PTC, thereby extending the PTC service life.

[0027] 2. An engine control system is proposed. By setting up an adaptive processor, memory, and signal acquisition system, it can collect, process, and calculate the ambient temperature, battery pack temperature, and engine power values ​​in real time, and then use the engine controller to control the engine output power in real time.

[0028] 3. By setting up a plate heat exchanger, the engine circulating water circuit and the battery pack circulating water circuit can exchange heat, and the battery pack can be heated by using the engine waste heat in a low temperature environment, which is more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of the adaptive control method of the present invention;

[0030] Figure 2 The temperature change curve of the battery pack according to the embodiment of the present invention;

[0031] Figure 3 The engine output power variation curve of the embodiment of the present invention;

[0032] Figure 4 Schematic diagram of the engine control system of the present invention. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0034] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0035] The battery pack power of REV models is greatly affected by temperature, especially in low temperature environments. As the ambient temperature drops, the battery pack power loss rate will increase significantly, seriously affecting the vehicle's endurance. When it is below 25°C, the lithium insertion reaction rate of the active material on the battery pack electrode surface slows down and the lithium ion concentration inside the active material decreases, which will cause the battery equilibrium potential to decrease, the internal resistance to increase, and the discharge capacity to decrease.

[0036] As shown in the table below, in extremely low temperature conditions, the electrolyte may even freeze and the battery may be unable to discharge, which will greatly affect the low-temperature performance of the battery system, causing the power output performance of electric vehicles to decline and the driving range to decrease.

[0037]

[0038] 1. An adaptive control method for engine heating battery pack in REV vehicles

[0039] like Figure 1 As shown, the adaptive control method of a REV vehicle engine heating battery pack of the present invention specifically includes the following steps:

[0040] S1, determining whether the ambient temperature is lower than the preset battery pack efficient operating temperature, if so, executing step S2, if not, the adaptive control method does not work;

[0041] S2, determine whether the engine is started, if so, execute step S3, if not, the adaptive control method does not work;

[0042] S3, detect the temperature change rate of the battery pack △K during the Tn period Tn ;

[0043] S4, control the engine output power W during the Tn+1 period Tn+1 =(1-△K Tn )×W Tn ×Y n , where Y nis the correction coefficient corresponding to the Tn time period, W Tn is the engine output power during the Tn period; (Specific principle: when the battery pack temperature change rate increases, it means that the battery pack temperature is recovering at an accelerated rate. At this time, the battery pack's demand for utilizing the engine's waste heat decreases, so the engine power can be reduced accordingly, improving engine energy efficiency)

[0044] S5, detect the temperature change rate of the battery pack △K during the Tn+1 period Tn+1 ;

[0045] S6, judge △K Tn+1 Is it less than △K Tn If so, let the correction coefficient Y corresponding to the Tn+1 time period be n+1 =2Y n If not, then let the correction coefficient corresponding to the Tn+1 time period be (By self-learning the correction coefficient based on the change in battery pack temperature, the correlation between the engine output power and the battery pack temperature change rate in the step S4 algorithm can be further enhanced, amplifying their influence.)

[0046] S7, set n=n+1, and re-execute step S1.

[0047] Furthermore, in step S1, the ambient temperature value is collected by a vehicle external temperature sensor, and the preset battery pack efficient operating temperature is pre-input into the adaptive processor, and the preset battery pack efficient operating temperature is specifically 25°C.

[0048] Furthermore, in step S2, the engine start signal is collected by an engine controller.

[0049] Furthermore, in step S3, the temperature change rate of the battery pack is collected by a battery pack temperature sensor and calculated by an adaptive processor.

[0050] Furthermore, in step S4, the engine output power is controlled by an engine controller.

[0051] Furthermore, the detection process and the judgment process are both performed in an adaptive processor.

[0052] In this embodiment, the adaptive control method described above is adopted. In a low temperature environment, the curves of battery pack temperature and engine output power changing with time are as follows: Figures 2-3 shown.

[0053] Depend on Figures 2-3 It can be inferred that under low temperature conditions, over time:

[0054] 1. The battery pack surface temperature rise rate is a constant value;

[0055] 2. The engine output power reduction rate is a constant value.

[0056] It can be seen that the adaptive control method of the REV vehicle engine heating battery pack of the present invention can prevent large fluctuations in the battery pack surface temperature and engine output power in low-temperature environments, thereby better protecting the battery pack and improving engine efficiency.

[0057] At the same time, the linear relationship between the engine output power and the battery pack surface temperature rise rate can be derived and then stored in the memory. Under the same subsequent environment, the engine output power can be directly deduced based on the battery pack surface temperature rise rate, thereby achieving accurate control of the engine output power.

[0058] 2. An Adaptive Engine Control System

[0059] Based on the same inventive concept, the embodiment of the present application also provides an adaptive engine control system, which adopts the adaptive control method as described above, such as Figure 4 As shown, based on the existing engine control system, an adaptive processor, a memory, a signal acquisition system and a plate heat exchanger are added.

[0060] Wherein, the existing engine controller is electrically connected to the adaptive processor, and is used to receive signals from the adaptive processor and control the engine output power;

[0061] The adaptive processor is electrically connected to the signal acquisition system and is used to receive the signal transmitted in real time by the signal acquisition system;

[0062] One end of the plate heat exchanger is connected to the engine circulating water circuit, and the other end is connected to the battery pack circulating water circuit, and is used to transfer heat from the engine circulating water circuit to the battery pack circulating water circuit.

[0063] Furthermore, the signal acquisition system includes:

[0064] The vehicle's external temperature sensor is located at the head of the vehicle and is used to collect real-time ambient temperature values;

[0065] The battery pack temperature sensor is located on the outer surface of the battery pack and is used to collect the real-time temperature value of the battery pack;

[0066] The power sensor is provided in the engine controller and is used to collect the real-time power value of the engine.

[0067] In summary, the adaptive control method and system for heating a battery pack of a REV vehicle engine according to the present invention are as follows:

[0068] 1. It can correct the engine output power in the next time period based on the battery pack temperature change rate in the current time period, and self-learn the correction coefficient based on the size of the battery pack temperature change rate in the next time period, so that the engine heat can be effectively used to increase the battery pack temperature, improve the engine energy utilization rate, and minimize the use frequency of the PTC, thereby extending the service life of the PTC;

[0069] 2. By setting up an adaptive processor, memory and signal acquisition system, it is possible to collect, process and calculate the ambient temperature, battery pack temperature and engine power values ​​in real time, and then use the engine controller to control the engine output power in real time;

[0070] 3. By setting up a plate heat exchanger, the engine circulating water circuit and the battery pack circulating water circuit can exchange heat, and the battery pack can be heated by using the engine waste heat in a low temperature environment, which is more energy-efficient.

[0071] Based on the same inventive concept, an embodiment of the present application also provides a vehicle equipped with the adaptive engine control system as described above.

[0072] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A REV vehicle engine control system that uses an adaptive control method to heat the battery pack, characterized in that: The system comprises an engine controller, an adaptive processor, and a plate heat exchanger. The engine controller is electrically connected to the adaptive processor, and is used to receive signals from the adaptive processor and control the engine output power. The adaptive processor is provided with a memory and is electrically connected to a signal acquisition system. One end of the plate heat exchanger is connected to the engine circulating water circuit, and the other end is connected to the battery pack circulating water circuit, and is used to transfer heat from the engine circulating water circuit to the battery pack circulating water circuit. By setting up an adaptive processor, memory and signal acquisition system, it is possible to collect, process and calculate the ambient temperature, battery pack temperature and engine power values ​​in real time, and then use the engine controller to control the engine output power in real time; The adaptive control method comprises the following steps: S1, determining whether the ambient temperature is lower than the preset battery pack efficient operating temperature, if so, executing step S2, if not, the adaptive control method does not work; S2, determine whether the engine is started, if so, execute step S3, if not, the adaptive control method does not work; S3, detect the temperature change rate of the battery pack △K during the Tn period Tn ; S4, control the engine output power W during the Tn+1 period Tn+1 =(1-△K Tn )×W Tn ×Y n , where Y n is the correction coefficient corresponding to the Tn time period, W Tn is the engine output power during the Tn period; S5, detect the temperature change rate of the battery pack △K during the Tn+1 period Tn+1 ; S6, judge △K Tn+1 Is it less than △K Tn If so, let the correction coefficient Y corresponding to the Tn+1 time period be n+1 =2Y n If not, then let the correction coefficient corresponding to the Tn+1 time period be S7, set n=n+1, and re-execute step S1.

2. The engine control system according to claim 1, characterized in that In step S1, the ambient temperature value is collected by a vehicle external temperature sensor, and the preset battery pack efficient operating temperature is pre-input into the adaptive processor. The preset battery pack efficient operating temperature is specifically 25°C.

3. The engine control system according to claim 1, characterized in that In step S2, the engine start signal is collected by an engine controller.

4. The engine control system according to claim 1, characterized in that In step S3, the temperature change rate of the battery pack is collected by the battery pack temperature sensor and calculated by the adaptive processor.

5. The engine control system according to claim 1, characterized in that In step S4, the engine output power is controlled by an engine controller.

6. The engine control system according to claim 1, characterized in that: The detection process and the judgment process are both performed in the adaptive processor.

7. The engine control system according to claim 1, characterized in that: The signal acquisition system comprises: The vehicle's external temperature sensor is located at the head of the vehicle and is used to collect real-time ambient temperature values; The battery pack temperature sensor is located on the outer surface of the battery pack and is used to collect the real-time temperature value of the battery pack; The power sensor is provided in the engine controller and is used to collect the real-time power value of the engine.

8. The engine control system according to claim 1, characterized in that: The engine circulating water circuit and the battery pack circulating water circuit are both provided with an electronically controlled pump and an electronically controlled valve.

9. A vehicle, characterized in that: Comprising the engine control system as claimed in claim 1.

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