Engine starting control method and device and vehicle

Abstract

The invention relates to the technical field of extended-range hybrid vehicles, in particular to an engine starting control method and device and a vehicle. The method comprises the steps that the current engine water temperature of the vehicle is obtained, whether the vehicle meets the preset range extender starting emission optimization condition or not is detected, and if yes, the actual cold state grade of the engine is determined based on the current engine water temperature, and the engine is started according to the actual cold state grade. And a target emission optimization mode of the engine is matched in combination with the current starting parameters of the vehicle, and at least one preheating action of the engine is generated according to the target emission optimization mode and executed till the engine meets the corresponding exit standard. According to the embodiment of the invention, the cold state grade of the engine can be confirmed by monitoring the thermal load state of the engine, and the corresponding optimization mode is obtained by combining the whole vehicle information aiming at different cold state grades, so that engine preheating under different conditions is adaptively realized, the starting temperature of the engine is efficiently improved, the emission of the engine under the cold starting condition is reduced, and the energy consumption is reduced. And the abrasion probability of the engine is reduced, and intelligence and practicability are higher.

Description

Technical Field

[0001] The present application relates to the technical field of extended-range hybrid vehicles, and in particular to an engine start control method, device and vehicle. Background Art

[0002] For extended-range hybrid vehicles, cold starting in a low-temperature environment will result in incomplete fuel combustion, which will lead to increased emissions. The three-way catalytic converter responsible for exhaust gas treatment cannot be fully utilized. Residual catalyst can cause exhaust pollution and aggravate the wear of engine bearings, valves and other parts.

[0003] In the related art, the three-way catalytic converter can be controlled to reach the operating temperature to perform cold start emission treatment, or the exhaust state and temperature of the vehicle's internal combustion engine can be used to determine whether to perform the corresponding auxiliary heating function on the engine.

[0004] However, in the related art, when the three-way catalytic converter has not reached the operating temperature, the harmful exhaust gas remaining therein will be directly discharged into the atmosphere, causing the vehicle exhaust pollution to worsen, and it is impossible to achieve regional division of engine temperature, and it is impossible to achieve targeted optimization of startup emissions according to different cold start conditions of the engine. It is difficult to achieve classified management of engine startup emissions optimization, resulting in increased energy consumption and emissions of the entire vehicle, and the lack of practicality and intelligence needs to be solved urgently. Summary of the invention

[0005] The present application provides an engine start control method, device and vehicle to solve the problems in the related art that when the three-way catalytic converter does not reach the operating temperature, the harmful exhaust gas remaining therein will be directly discharged into the atmosphere, causing the vehicle exhaust pollution to be aggravated, and it is impossible to achieve regional division of engine temperature, and it is impossible to achieve targeted optimization of start-up emissions according to different cold start conditions of the engine. It is difficult to achieve classified management of engine start-up emission optimization, resulting in increased energy consumption and emissions of the whole vehicle, and insufficient practicality and intelligence.

[0006] The first aspect of the present application provides an engine start-up control method, comprising the following steps: obtaining a current engine water temperature of a vehicle, and detecting whether the vehicle meets a preset range extender start-up emission optimization condition based on the current engine water temperature; when it is detected that the vehicle meets the preset range extender start-up emission optimization condition, confirming the actual cold state level of the engine based on the current engine water temperature; matching a target emission optimization mode of the engine based on the current startup parameters of the vehicle and the actual cold state level, generating at least one preheating action of the engine according to the target emission optimization mode, and controlling the vehicle to perform the at least one preheating action until the engine meets the exit criteria corresponding to the target emission optimization mode.

[0007] Optionally, in one embodiment of the present application, the target emission optimization mode of the engine is matched based on the current startup parameters of the vehicle and the actual cold state level, including: based on the current startup parameters, obtaining a first comparison result of the medium and high circulating water temperature difference of the engine and a preset temperature difference threshold; based on the current startup parameters, obtaining a second comparison result of the vehicle speed and a preset vehicle speed threshold; and using the actual cold state level, the first comparison result and the second comparison result to confirm the target emission optimization mode.

[0008] Optionally, in one embodiment of the present application, the use of the actual cold state level, the first comparison result and the second comparison result to confirm the target emission optimization mode includes: when the first comparison result is that the medium-high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is a conventional cold state level, determining that the target emission optimization mode is the preset first emission optimization mode; when the first comparison result is that the medium-high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is an extreme cold state level, or, when the first comparison result is that the medium-high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the whole vehicle speed is greater than the preset vehicle speed threshold, determining that the target emission optimization mode is the preset second emission optimization mode; when the first comparison result is that the medium-high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the whole vehicle speed is equal to the preset vehicle speed threshold, determining that the target emission optimization mode is the preset third emission optimization mode.

[0009] Optionally, in one embodiment of the present application, before obtaining the current engine water temperature of the vehicle, it also includes: determining whether there is at least one target sensor of the vehicle that satisfies a preset fault condition; if there is at least one target sensor of the vehicle that satisfies the preset fault condition, generating fault alarm information based on at least one target sensor that satisfies the preset fault condition, and controlling at least one interactive device of the vehicle to send the fault alarm information.

[0010] The second aspect of the present application provides an engine start control device, including: a detection module, used to obtain a current engine water temperature of a vehicle, and detect whether the vehicle meets a preset range extender start emission optimization condition based on the current engine water temperature; a confirmation module, used to confirm the actual cold state level of the engine based on the current engine water temperature when it is detected that the vehicle meets the preset range extender start emission optimization condition; a control module, used to match a target emission optimization mode of the engine based on the current startup parameters of the vehicle and the actual cold state level, generate at least one preheating action of the engine according to the target emission optimization mode, and control the vehicle to perform the at least one preheating action until the engine meets the exit criteria corresponding to the target emission optimization mode.

[0011] Optionally, in one embodiment of the present application, the control module includes: a first acquisition unit, used to obtain a first comparison result of the medium and high circulating water temperature difference of the engine and a preset temperature difference threshold based on the current startup parameters; a second acquisition unit, used to obtain a second comparison result of the vehicle speed and a preset vehicle speed threshold based on the current startup parameters; a confirmation unit, used to confirm the target emission optimization mode using the actual cold state level, the first comparison result and the second comparison result.

[0012] Optionally, in one embodiment of the present application, the confirmation unit is specifically used to: when the first comparison result is that the medium-high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is a conventional cold state level, determine that the target emission optimization mode is the preset first emission optimization mode; when the first comparison result is that the medium-high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is an extreme cold state level, or, when the first comparison result is that the medium-high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is greater than the preset vehicle speed threshold, determine that the target emission optimization mode is the preset second emission optimization mode; when the first comparison result is that the medium-high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is equal to the preset vehicle speed threshold, determine that the target emission optimization mode is the preset third emission optimization mode.

[0013] Optionally, in one embodiment of the present application, the device also includes: a judgment module, used to judge whether there is at least one target sensor of the vehicle that satisfies a preset fault condition before obtaining the current engine water temperature of the vehicle; an alarm module, used to generate fault alarm information based on at least one target sensor that satisfies the preset fault condition when there is at least one target sensor of the vehicle that satisfies the preset fault condition, and control at least one interactive device of the vehicle to send the fault alarm information.

[0014] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the engine start control method as described in the above embodiment.

[0015] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned engine start control method.

[0016] A fifth aspect of the present application provides a computer program product, including a computer program, which implements the above engine start control method when executed.

[0017] The embodiment of the present application can confirm the cold state level of the engine by monitoring the thermal load state of the engine, and obtain the corresponding optimization mode for different cold state levels combined with the vehicle information, and adaptively realize engine preheating under different conditions, thereby efficiently increasing the engine starting temperature, reducing the emission under the cold start condition of the engine, and reducing the probability of engine wear, and it is more intelligent and practical. Therefore, it solves the problem in the related technology that when the three-way catalytic converter does not reach the operating temperature, the residual harmful exhaust gas will be directly discharged into the atmosphere, causing the vehicle exhaust pollution to increase, and it is impossible to achieve regional division of engine temperature, and it is impossible to achieve targeted optimization of startup emissions according to different cold start conditions of the engine. It is difficult to achieve classified management of engine startup emission optimization, resulting in increased energy consumption and emissions of the whole vehicle, and insufficient practicality and intelligence.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A flowchart of an engine start control method provided according to an embodiment of the present application;

[0021] Figure 2 A logical schematic diagram of cold start emission optimization for a range-extended vehicle according to an embodiment of the present application;

[0022] Figure 3 is a structural schematic diagram of an engine start control device according to an embodiment of the present application;

[0023] Figure 4 It is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below, and 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 to be used to explain the present application, and should not be construed as limiting the present application.

[0025] The following describes the engine start control method, device and vehicle of the embodiment of the present application with reference to the accompanying drawings. In view of the related technologies mentioned in the above background technology, when the three-way catalytic converter does not reach the operating temperature, the residual harmful exhaust gas will be directly discharged into the atmosphere, causing the vehicle exhaust pollution to be aggravated, and it is impossible to achieve regional division of engine temperature, and it is impossible to achieve targeted optimization of start-up emissions according to different cold start conditions of the engine. It is difficult to achieve classified management of engine start-up emission optimization, resulting in increased energy consumption and emissions of the whole vehicle, and insufficient practicality and intelligence. The present application provides an engine start control method, in which the engine cold state level can be confirmed by monitoring the engine thermal load state, and the corresponding optimization mode can be obtained for different cold state levels combined with the whole vehicle information, and the engine preheating under different conditions can be adaptively realized, thereby efficiently increasing the engine start temperature, reducing the emission under the cold start condition of the engine, and reducing the probability of engine wear, and the intelligence and practicality are stronger. Thereby, the problem in the related technology that when the three-way catalytic converter fails to reach the operating temperature, the harmful exhaust gas remaining therein will be directly discharged into the atmosphere, causing the vehicle exhaust pollution to worsen, and it is impossible to achieve regional division of engine temperature, and it is impossible to achieve targeted optimization of startup emissions according to different cold start conditions of the engine, and it is difficult to achieve classified management of engine startup emissions optimization, resulting in increased energy consumption and emissions of the whole vehicle, and insufficient practicality and intelligence.

[0026] Specifically, Figure 1 A flow chart of an engine start control method provided in an embodiment of the present application.

[0027] like Figure 1 As shown, the engine start control method includes the following steps:

[0028] In step S101, the current engine water temperature of the vehicle is obtained, and whether the vehicle meets the preset range extender start-up emission optimization conditions is detected according to the current engine water temperature.

[0029] It should be noted that the preset range extender startup emission optimization conditions can be set by those skilled in the art according to actual conditions and are not specifically limited here.

[0030] It is understood that in the embodiment of the present application, the current engine water temperature may be the current temperature of the engine water circuit. The verification of the preset range extender startup emission optimization condition may be performed by obtaining the current temperature TOH of the engine water circuit and the first cold start temperature threshold TOH during the startup of the range extender hybrid vehicle. min1 For comparison, if TOH>TOH min1 , it is considered that the current engine water temperature is at or above normal temperature, that is, the start is determined to be a normal temperature start. If TOH≤TOH min1 , it means that the engine operating temperature is low, the start is a cold start, the engine circulating water needs to be preheated, and it is determined that the vehicle meets the preset range extender start emission optimization conditions.

[0031] Optionally, in one embodiment of the present application, before obtaining the current engine water temperature of the vehicle, it also includes: determining whether the vehicle has at least one target sensor that satisfies a preset fault condition; if the vehicle has at least one target sensor that satisfies the preset fault condition, generating fault alarm information based on at least one target sensor that satisfies the preset fault condition, and controlling at least one interactive device of the vehicle to send the fault alarm information.

[0032] It should be noted that the preset fault conditions can be set by those skilled in the art according to actual conditions and are not specifically limited here.

[0033] In the actual implementation process, at least one target sensor may include an electric engine water temperature sensor, a motor circulation water circuit temperature sensor, an engine speed sensor, a vehicle speed monitoring sensor, etc. After the vehicle is powered on, the monitoring functions of the electric engine water temperature sensor, the motor circulation water circuit temperature sensor, the engine speed sensor, and the vehicle speed monitoring sensor are checked to see if they are normal. If they are normal, proceed to the next step. If at least one target sensor fails, an alarm is sounded, and the fault mode is entered. Fault alarm information is generated according to the faulty sensor, and at least one interactive device of the vehicle is controlled to send a fault alarm information to remind passengers. Furthermore, the fault code can be displayed and an alarm can be sounded, and the vehicle ensures that the high voltage is powered off and the vehicle is parked at the same time.

[0034] In step S102, when it is detected that the vehicle meets the preset range extender start emission optimization conditions, the actual cold level of the engine is confirmed based on the current engine water temperature.

[0035] It can be understood that in the embodiments of the present application, the actual cold level of the engine can be confirmed by the coldness of the current engine water temperature. The cold level may include low, medium and high levels of water temperature, which helps to determine the need and degree of engine preheating.

[0036] In step S103, the target emission optimization mode of the engine is matched based on the current startup parameters and actual cold state level of the vehicle, at least one preheating action of the engine is generated according to the target emission optimization mode, and the vehicle is controlled to perform at least one preheating action until the engine meets the exit criteria corresponding to the target emission optimization mode.

[0037] It is understandable that in the embodiments of the present application, the target emission optimization mode may correspond to different preheating schemes. For example, emission optimization mode A, emission optimization mode B and emission optimization mode C may be set. Under emission optimization mode A, the preheating action may include the interconnection of medium and high temperature circulating water circuits, the medium and high temperature water in the motor enters the engine circulating water in a cold state, and preheats the engine; under emission optimization mode B, the preheating action may include the interconnection of medium and high temperature circulating water circuits, the medium and high temperature water in the motor enters the engine circulating water in a cold state, and the generator starts working and generates heat by itself, and the generator system adopts an inefficient heating working mode; under emission optimization mode C, the medium and high temperature circulating water circuits circulate independently, and the generator starts working and generates heat by itself, and the generator system adopts an inefficient heating working mode.

[0038] Furthermore, the exit criteria corresponding to emission optimization mode A, emission optimization mode B and emission optimization mode C are different. To exit emission optimization mode A, the evaluation criteria are: TOM-TOH≤△T2, △T2 uses a smaller value, such as △T1=1℃~3℃, that is, the temperature difference between the two circulating water paths is small. To exit emission optimization mode B, the evaluation criteria are: TOM-TOH≤△T2, and the three-way catalytic converter has started to work. To exit emission optimization mode C, the evaluation criteria are: the three-way catalytic converter has started to work. After detecting that the vehicle meets the exit criteria corresponding to the target emission optimization mode, the optimization is terminated and the emission optimization mode is exited.

[0039] Specifically, for the working process and exit process of the three exemplary emission optimization modes, the 4-way valve connecting the middle and high water circuits can be adjusted according to the different operating conditions of the vehicle to achieve the mutual connection of the middle and high circulation water circuits. By rationally utilizing the heat source water of the middle temperature circulation water circuit to directly enter the high temperature circulation water circuit of the cold engine, the engine can be preheated, the problem of the engine starting temperature being too low can be solved, and the starting emissions can be improved. The specific contents are as follows:

[0040] Start emission optimization mode A: This mode is mainly based on the fact that the temperature of the high-temperature circulating water in the motor is much higher than that of the high-temperature circulating water in the cold engine. At this time, the high-temperature circulating water circuit is switched from the original independent operation to the interconnected form through the highly integrated thermal management system of the range extender, and the two circulating water circuits become a large circulating water circuit. Further detailed description is required: the engine high-temperature water circuit closes its large circulating water circuit, and only the small circulating water circuit of the high-temperature water circuit is interconnected with the medium-temperature water of the motor; then the engine water pump works at the preset small circulation N_wp (when the medium-temperature and high-temperature circulating water are connected in series, the engine water pump presets the small circulation speed) speed, and the medium-temperature circulating water with a temperature much higher than the cold engine water is introduced into the engine small circulating water circuit, so as to quickly increase the engine temperature and avoid cold start of the engine. At the same time, the cold water of the high-temperature circulating water circuit enters the medium-temperature circulating water of the motor to improve the motor performance.

[0041] Start emission optimization mode B: This mode is mainly based on the situation that the engine temperature is at an extremely low temperature or the temperature difference of the medium and high temperature circulating water is not particularly large and the whole vehicle is running. Therefore, it is necessary to add a low-efficiency and high-heat mode of the generator system on the basis of emission optimization mode A. The motor generally operates at the optimal current map. At this time, the motor can output the maximum power at the minimum current. At this time, the efficiency is the highest and the motor heat is the lowest. The motor system uses Map_GH (the conventional high-efficiency power generation work Map of the generator system) to operate. In order to increase the thermal load of the motor, a version of Map_GL (the low-efficiency power generation work Map of the generator system) in the low-efficiency and high-heat mode is calibrated during the motor development process. At this time, the motor operates with the purpose of outputting medium and high heat loads, so as to quickly increase the motor water temperature, and the increased motor water temperature enters the cold engine circulating water circuit. Therefore, in this mode, the engine is based on its initial circulating water temperature TOH min2 ≤TOH≤TOH min1 or TOH≤TOH min2 According to the preset Map_El1 (engine at low temperature TOH min2 ≤TOH≤TOH min1 The preset cold start optimal emission operating conditions Map) and Map_El2 (engine at extremely low temperature TOH≤TOH min2 The engine starts working under the preset cold start optimal emission operating condition Map) and generates heat by itself. At the same time, the generator works in a low-efficiency and high-heat manner according to Map_GL and switches to a series interconnected form in conjunction with the medium and high temperature circulating water circuit of the optimization mode A. Based on this dual and multiple heating mode, the problem of insufficient heat for preheating the engine or medium-temperature water at extremely low temperatures can be solved.

[0042] Start emission optimization mode C: This mode is mainly aimed at the situation where the temperature difference between the medium and high circulating water is close, both are in a low temperature state and the whole vehicle has not been operated, such as the whole vehicle traveling overnight in winter. At this time, it is not possible to directly switch the medium and high temperature circulating water circuits to interconnect and preheat the cold engine, that is, the medium and high temperature circulating water circuits circulate independently. Therefore, when the range extender receives the power generation mode instruction, the engine can only start normally to preheat itself. At the same time, the low-efficiency high-heat mode of the generator system (executed according to Map_GL) heats the medium-temperature circulating water. The main purpose is to preheat the battery (not explained here). Therefore, in this mode, the engine is based on its initial circulating water temperature TOH min2 ≤TOH≤TOH min1 or TOH≤TOH min2 Start working according to the preset Map_El1 and Map_El2 working conditions respectively.

[0043] Exit preheating mode A: This mode uses medium-temperature circulating water to preheat the engine's high-temperature circulating water in a cold state. The judgment standard is the threshold value of the difference in water temperature between the two routes. During the operation of this mode, the temperature difference between the medium and high temperature circulating water is monitored at every interval period t; when the temperature difference between the medium and high temperature circulating water TOM-TOH≤△T2, it is considered that the temperature difference between the two is small, and the startup emission optimization mode A is exited.

[0044] Exit preheating mode B: This mode is to preheat the engine high temperature circulating water in the cold state with medium temperature circulating water, and to preheat the engine by combining the self-heating after the engine cold start (according to Map_El1 or Map_El2) and the low-efficiency high-heat mode of the range-extending generator system (according to Map_GL) to improve the cold start emission problem. The evaluation criteria are the threshold of the difference between the two water temperatures and the working state of the engine three-way catalytic converter CAT_s (three-way catalytic converter working state information feedback); during the operation of this mode, the medium and high temperature circulating water temperature difference is monitored at every interval period t; when the medium and high temperature circulating water temperature difference TOM-TOH≤△T2, and CAT_s=1 (the catalyst has started to work), the start-up emission optimization mode B is exited, and the operation map of the range-extending generator system is switched to Map_GH. CAT_s=0 means that the catalyst has not reached the ignition temperature, that is, it has not started to work.

[0045] Exit preheating mode C: In this mode, since the medium and high temperature circulating water are both in low temperature state, it is impossible to improve the cold engine by connecting the two circulating waters in series, that is, the medium and high temperature circulating water circuits circulate independently, so the engine can only be preheated by itself after cold start (according to Map_El1 or Map_El2), and at the same time, the low-efficiency high-heat mode of the generator system (executed according to Map_GL) preheats the medium and high temperature circulating water. The main purpose is to preheat the battery, which will not be elaborated here. Therefore, the evaluation standard is the working state CAT_s of the engine three-way catalytic converter; during the operation of this mode, the working state CAT_s of the three-way catalytic converter is monitored at every interval period t. When CAT_s=1, the startup emission optimization mode C is exited, and the operation map of the range-extending generator system is switched to Map_GH.

[0046] Optionally, in one embodiment of the present application, a target emission optimization mode of the engine is matched based on the current startup parameters and actual cold state level of the vehicle, including: based on the current startup parameters, obtaining a first comparison result of the engine's medium and high circulating water temperature difference and a preset temperature difference threshold; based on the current startup parameters, obtaining a second comparison result of the vehicle speed and a preset vehicle speed threshold; and using the actual cold state level, the first comparison result and the second comparison result to confirm the target emission optimization mode.

[0047] It should be noted that the preset temperature difference threshold and the preset vehicle speed threshold can be set by those skilled in the art according to actual conditions and are not specifically limited here.

[0048] In the actual implementation process, the preset temperature difference threshold can be the medium and high circulating water temperature difference threshold, obtain the difference between the motor medium temperature circulating water temperature TOM and the engine water temperature TOH, and determine whether TOM-TOH≥△T1 exists. If so, match the target emission optimization mode according to the actual cold state level obtained by the engine, otherwise, match the target emission optimization mode based on the vehicle speed. The vehicle speed V can be read by the vehicle VCU, and the corresponding emission optimization mode is confirmed according to the different size relationships between the vehicle speed and the preset speed threshold.

[0049] Optionally, in one embodiment of the present application, the target emission optimization mode is confirmed using the actual cold state level, the first comparison result and the second comparison result, including: when the first comparison result is that the medium-high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is the conventional cold state level, the target emission optimization mode is determined to be the preset first emission optimization mode; when the first comparison result is that the medium-high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is the extreme cold state level, or when the first comparison result is that the medium-high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is greater than the preset vehicle speed threshold, the target emission optimization mode is determined to be the preset second emission optimization mode; when the first comparison result is that the medium-high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is equal to the preset vehicle speed threshold, the target emission optimization mode is determined to be the preset third emission optimization mode.

[0050] It should be noted that the preset first emission optimization mode, the preset second emission optimization mode and the preset third emission optimization mode can be set by those skilled in the art according to actual conditions and are not specifically limited here.

[0051] In the actual implementation process, the current engine water temperature, that is, the current temperature TOH of the engine circulating water circuit, can be compared with the second cold start temperature threshold TOH. min2 For comparison. If TOH min2 ≤TOH≤TOH min1 , it means that the engine operating temperature is low, the start is a regular cold start, the engine circulating water needs to be preheated, and the actual cold level is the regular cold level; if TOH≤TOH min2 , it means that the engine operating temperature is extremely low, the start is an extreme cold start, the engine circulating water needs to be preheated to a high degree, and the actual cold state level is an extreme cold state level. Therefore, the corresponding emission optimization mode is matched according to different cold state levels.

[0052] Exemplarily, the preset first emission optimization mode may include the interconnection of medium and high temperature circulating water circuits, the medium and high temperature water of the motor enters the cold engine circulating water to preheat the engine. The preset second emission optimization mode may include the interconnection of medium and high temperature circulating water circuits, the medium and high temperature water of the motor enters the cold engine circulating water, and the generator starts working and generates heat by itself, and the generator system adopts an inefficient heating working mode. The preset third emission optimization mode, the medium and high temperature circulating water circuits circulate independently, and the generator starts working and generates heat by itself, and the generator system adopts an inefficient heating working mode.

[0053] like Figure 2 As shown, the working content of the embodiment of the present application is described in detail below with a specific embodiment.

[0054] First, after the vehicle is powered on, check whether the monitoring functions of the electric engine water temperature sensor, motor circulation water circuit temperature sensor, engine speed sensor, and vehicle speed monitoring sensor are normal. If normal, proceed to the next step. If faulty, an alarm will be sounded and the vehicle will enter the fault mode, display the fault code and sound an alarm. Ensure that the high voltage of the vehicle is turned off and the vehicle is parked at the same time.

[0055] Get the current temperature TOH of the engine circulation water circuit and the cold start temperature threshold TOH min1 and TOH min2 Compare and judge the current temperature TOH of the engine circulation water circuit: if TOH>TOH min1 , indicating that the engine temperature is at or above normal temperature, and its start belongs to normal temperature start; if TOH min2 ≤TOH≤TOH min1 , indicating that the engine operating temperature is too low, the start is a cold start, and the engine circulating water needs to be preheated, then the range extender starts the emission optimization mode demand judgment; if TOH≤TOH min2 , indicating that the engine operating temperature is extremely low, the start is an extremely cold start, and the engine circulating water needs to be preheated to a high degree, then the range extender starts and the emission optimization mode needs to be judged.

[0056] Determine the emission optimization mode requirements for starting the range extender. Determine the emission optimization requirements for cold start based on the engine high temperature circulating water temperature TOH and the motor medium temperature circulating water temperature TOM (engine water temperature TOH, motor water temperature TOM), as well as the engine and vehicle operating conditions.

[0057] If the speed n=0, the vehicle speed V>0, TOH min2 ≤TOH≤TOH min1 , conventional cold start, and at this time the temperature difference between the medium and high circulating water is greater than or equal to the set threshold (TOM-TOH≥△T1), it means that the vehicle is running in pure electric mode, and the medium temperature water is much higher than the engine circulating water in the cold state. If an instruction to enter or predict the extended range power generation mode is received, the emission optimization mode A is started.

[0058] If the speed n=0, the vehicle speed V>0, TOH≤TOH min2 (The engine temperature is extremely low), and the temperature difference between the medium and high circulating water is greater than or equal to the set threshold (TOM-TOH≥△T1), it means that the vehicle is running in pure electric mode, and the medium temperature water is much higher than the engine circulating water in the cold state. If an instruction to enter or predict the extended range power generation mode is received, the emission optimization mode B is started.

[0059] If the speed n=0, the vehicle speed V>0, and the temperature difference between the medium and high circulating water is less than the threshold value (TOM-TOH<△T1), it means that the vehicle is running in pure electric mode and has just started running for a short time, and the temperature difference between the medium temperature water and the engine circulating water in the cold state is small. If an instruction to enter or predict the extended range power generation mode is received, the emission optimization mode B is started.

[0060] If the speed n=0, the vehicle speed V=0, TOH min2 ≤TOH≤TOH min1 , conventional cold start, and at this time the difference between the medium and high circulating water temperatures is greater than or equal to the threshold (TOM-TOH≥△T1), it means that the vehicle has stopped after running in pure electric mode, and the medium temperature water is much higher than the engine circulating water in the cold state. If an instruction to enter or predict the extended range power generation mode is received, the emission optimization mode A is started.

[0061] If the speed n=0, the vehicle speed V=0, TOH≤TOH min2 (The engine temperature is extremely low), and the temperature difference between the medium and high circulating water is greater than or equal to the threshold value (TOM-TOH≥△T1), which means that the vehicle has stopped after running in pure electric mode, and the medium temperature water is much higher than the engine circulating water in the cold state. If an instruction to enter or predict the extended range power generation mode is received, the emission optimization mode B is started.

[0062] If the speed n=0, the vehicle speed V=0, and the temperature difference between the medium and high circulating water is less than the threshold value (TOM-TOH<△T1), it means that the vehicle has just been powered on or has not been running for a long time, and the medium temperature water is similar to the engine circulating water temperature in the cold state. If an instruction to enter or predict the extended range power generation mode is received, the emission optimization mode C is started.

[0063] The range extender starts the emission optimization mode. Emission optimization mode A: The medium and high temperature circulating water circuits are interconnected, and the medium temperature water of the motor enters the cold engine circulating water to preheat the engine. Emission optimization mode B: The medium and high temperature circulating water circuits are interconnected, and the medium temperature water of the motor enters the cold engine circulating water. At the same time, the engine is based on its initial circulating water temperature TOH min2 ≤TOH≤TOH min1 or TOH≤TOH min2 The engine starts working according to the preset Map_El1 and Map_El2 working conditions, and the generator system adopts the low-efficiency heating working mode. Emission optimization mode C: The medium and high temperature circulating water circuits circulate independently, and the engine is based on its initial circulating water temperature TOH min2 ≤TOH≤TOH min1 or TOH≤TOH min2 The operation is started according to the preset Map_El1 and Map_El2 working conditions respectively, and the generator system operates in the inefficient heating mode.

[0064] Exit preheating. By comparing the temperature difference between the engine high temperature TOH and the motor medium temperature circulating water temperature TOM, and judging whether the engine three-way catalytic converter has started to work, different exit preheating evaluation criteria are used in different startup emission optimization modes.

[0065] According to the engine start control method proposed in the embodiment of the present application, the cold state level of the engine can be confirmed by monitoring the engine thermal load state, and the corresponding optimization mode can be obtained for different cold state levels in combination with the vehicle information, so as to adaptively realize the engine preheating under different conditions, thereby efficiently increasing the engine start temperature, reducing the emission under the cold start condition of the engine, reducing the probability of engine wear, and being more intelligent and practical. Thus, the problem in the related art that when the three-way catalytic converter does not reach the operating temperature, the residual harmful exhaust gas will be directly discharged into the atmosphere, causing the vehicle exhaust pollution to increase, and it is impossible to realize the regional division of the engine temperature, and it is impossible to realize the targeted optimization of the start-up emission according to the different cold start conditions of the engine, and it is difficult to realize the classified management of the optimization of the engine start-up emission, resulting in the increase of the energy consumption and emission of the whole vehicle, and the lack of practicality and intelligence.

[0066] Next, the engine starting control device proposed according to the embodiment of the present application is described with reference to the accompanying drawings.

[0067] Figure 3 It is a schematic diagram of the structure of the engine starting control device of an embodiment of the present application.

[0068] like Figure 3 As shown, the engine start control device 10 includes: a detection module 100 , a confirmation module 200 and a control module 300 .

[0069] The detection module 100 is used to obtain the current engine water temperature of the vehicle, and detect whether the vehicle meets the preset range extender start-up emission optimization conditions according to the current engine water temperature.

[0070] The confirmation module 200 is used to confirm the actual cold level of the engine based on the current engine water temperature when it is detected that the vehicle meets the preset range extender start emission optimization conditions.

[0071] The control module 300 is used to match the target emission optimization mode of the engine based on the current starting parameters and actual cold state level of the vehicle, generate at least one preheating action of the engine according to the target emission optimization mode, and control the vehicle to perform at least one preheating action until the engine meets the exit criteria corresponding to the target emission optimization mode.

[0072] Optionally, in one embodiment of the present application, the control module 300 includes: a first acquisition unit, a second acquisition unit and a confirmation unit.

[0073] The first acquisition unit is used to acquire a first comparison result between the medium and high circulating water temperature difference of the engine and a preset temperature difference threshold value based on the current startup parameters.

[0074] The second acquisition unit is used to acquire a second comparison result between the vehicle speed and a preset vehicle speed threshold based on the current startup parameter.

[0075] The confirmation unit is used to confirm the target emission optimization mode by using the actual cold state level, the first comparison result and the second comparison result.

[0076] Optionally, in one embodiment of the present application, the confirmation unit is specifically used to: when the first comparison result is that the temperature difference between the medium and high circulating waters is greater than or equal to the preset temperature difference threshold and the actual cold state level is the conventional cold state level, determine that the target emission optimization mode is the preset first emission optimization mode; when the first comparison result is that the temperature difference between the medium and high circulating waters is greater than or equal to the preset temperature difference threshold and the actual cold state level is the extreme cold state level, or, when the first comparison result is that the temperature difference between the medium and high circulating waters is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is greater than the preset vehicle speed threshold, determine that the target emission optimization mode is the preset second emission optimization mode; when the first comparison result is that the temperature difference between the medium and high circulating waters is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is equal to the preset vehicle speed threshold, determine that the target emission optimization mode is the preset third emission optimization mode.

[0077] Optionally, in one embodiment of the present application, the device 10 further includes: an alarm module and a judgment module.

[0078] The judgment module is used to judge whether there is at least one target sensor of the vehicle that meets a preset fault condition before obtaining the current engine water temperature of the vehicle.

[0079] The alarm module is used to generate fault alarm information based on at least one target sensor that meets the preset fault condition when there is at least one target sensor in the vehicle that meets the preset fault condition, and control at least one interactive device of the vehicle to send the fault alarm information.

[0080] It should be noted that the above explanations of the engine start control method embodiment are also applicable to the engine start control device of this embodiment, and will not be repeated here.

[0081] According to the engine start control device proposed in the embodiment of the present application, the cold state level of the engine can be confirmed by monitoring the thermal load state of the engine, and the corresponding optimization mode can be obtained for different cold state levels in combination with the vehicle information, so as to adaptively realize engine preheating under different conditions, thereby efficiently increasing the engine start temperature, reducing the emission under the cold start condition of the engine, reducing the probability of engine wear, and being more intelligent and practical. Thus, the problem in the related art that when the three-way catalytic converter does not reach the operating temperature, the residual harmful exhaust gas will be directly discharged into the atmosphere, causing the vehicle exhaust pollution to be aggravated, and it is impossible to realize the regional division of the engine temperature, and it is impossible to realize the targeted optimization of the start-up emission according to the different cold start conditions of the engine, and it is difficult to realize the classified management of the optimization of the engine start-up emission, resulting in the increase of the energy consumption and emission of the whole vehicle, and the lack of practicality and intelligence.

[0082] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0083] Memory 401 , processor 402 , and a computer program stored in the memory 401 and executable on the processor 402 .

[0084] When the processor 402 executes the program, the engine start control method provided in the above embodiment is implemented.

[0085] Furthermore, the vehicle also includes:

[0086] The communication interface 403 is used for communication between the memory 401 and the processor 402 .

[0087] The memory 401 is used to store computer programs that can be executed on the processor 402 .

[0088] The memory 401 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0089] If the memory 401, the processor 402 and the communication interface 403 are implemented independently, the communication interface 403, the memory 401 and the processor 402 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0090] Optionally, in a specific implementation, if the memory 401, the processor 402 and the communication interface 403 are integrated on a chip, the memory 401, the processor 402 and the communication interface 403 can communicate with each other through an internal interface.

[0091] The processor 402 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0092] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above engine start control method is implemented.

[0093] This embodiment also provides a computer program product, including a computer program, which implements the above engine start control method when executed.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0095] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0096] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0097] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0098] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0099] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0100] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0101] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An engine start control method, characterized in that: The following steps are involved: Acquiring a current engine water temperature of the vehicle, and detecting whether the vehicle meets a preset range extender start-up emission optimization condition according to the current engine water temperature; In the case where it is detected that the vehicle meets the preset range extender start emission optimization condition, confirming the actual cold state level of the engine based on the current engine water temperature; Matching a target emission optimization mode of the engine based on current startup parameters of the vehicle and the actual cold state level, generating at least one preheating action of the engine according to the target emission optimization mode, and controlling the vehicle to perform the at least one preheating action until the engine meets an exit criterion corresponding to the target emission optimization mode.

2. The method according to claim 1, characterized in that The matching of the target emission optimization mode of the engine based on the current startup parameters of the vehicle and the actual cold level includes: Based on the current startup parameters, obtaining a first comparison result between the medium and high circulating water temperature difference of the engine and a preset temperature difference threshold; Based on the current startup parameter, obtaining a second comparison result between the vehicle speed and a preset vehicle speed threshold; The target emission optimization mode is confirmed using the actual cold level, the first comparison result, and the second comparison result.

3. The method according to claim 2, characterized in that The confirming the target emission optimization mode by using the actual cold level, the first comparison result and the second comparison result comprises: When the first comparison result is that the medium and high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is the conventional cold state level, determining that the target emission optimization mode is the preset first emission optimization mode; When the first comparison result is that the medium and high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is the extreme cold state level, or when the first comparison result is that the medium and high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is greater than the preset vehicle speed threshold, it is determined that the target emission optimization mode is the preset second emission optimization mode; When the first comparison result is that the medium and high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is equal to the preset vehicle speed threshold, it is determined that the target emission optimization mode is the preset third emission optimization mode.

4. The method according to claim 1, characterized in that Before obtaining the current engine water temperature of the vehicle, it also includes: Determining whether at least one target sensor of the vehicle satisfies a preset fault condition; In the case that at least one target sensor of the vehicle satisfies the preset fault condition, fault alarm information is generated based on the at least one target sensor that satisfies the preset fault condition, and at least one interactive device of the vehicle is controlled to send the fault alarm information.

5. An engine starting control device, characterized in that: include: A detection module, used to obtain a current engine water temperature of the vehicle, and detect whether the vehicle meets a preset range extender start-up emission optimization condition according to the current engine water temperature; a confirmation module, configured to confirm an actual cold state level of the engine based on the current engine water temperature when it is detected that the vehicle meets the preset range extender start emission optimization condition; A control module is used to match the target emission optimization mode of the engine based on the current startup parameters of the vehicle and the actual cold state level, generate at least one warm-up action of the engine according to the target emission optimization mode, and control the vehicle to perform the at least one warm-up action until the engine meets the exit criteria corresponding to the target emission optimization mode.

6. The device according to claim 5, characterized in that The control module comprises: A first acquisition unit, configured to acquire a first comparison result of a medium-high circulating water temperature difference of the engine and a preset temperature difference threshold value based on the current startup parameter; A second acquisition unit, configured to acquire a second comparison result between the vehicle speed and a preset vehicle speed threshold based on the current startup parameter; A confirmation unit is used to confirm the target emission optimization mode by using the actual cold state level, the first comparison result and the second comparison result.

7. The device according to claim 6, characterized in that The confirmation unit is specifically used for: When the first comparison result is that the medium and high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is the conventional cold state level, determining that the target emission optimization mode is the preset first emission optimization mode; When the first comparison result is that the medium and high circulating water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is the extreme cold state level, or when the first comparison result is that the medium and high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is greater than the preset vehicle speed threshold, it is determined that the target emission optimization mode is the preset second emission optimization mode; When the first comparison result is that the medium and high circulating water temperature difference is less than the preset temperature difference threshold and the second comparison result is that the vehicle speed is equal to the preset vehicle speed threshold, it is determined that the target emission optimization mode is the preset third emission optimization mode.

8. The device according to claim 6, characterized in that Also includes: A judgment module, used for judging whether there is at least one target sensor of the vehicle that meets a preset fault condition before obtaining the current engine water temperature of the vehicle; An alarm module is used to generate fault alarm information based on at least one target sensor that meets the preset fault condition, and control at least one interactive device of the vehicle to send the fault alarm information when at least one target sensor in the vehicle meets the preset fault condition.

9. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the engine start control method as described in any one of claims 1 to 4.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the engine start control method as described in any one of claims 1 to 4.

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