Engine start control method, device and vehicle

Abstract

The application relates to the technical field of extended-range hybrid vehicles, in particular to an engine starting control method and device and a vehicle, wherein the method comprises the following steps: obtaining the current engine water temperature of the vehicle; detecting whether the vehicle meets preset extended-range starter starting emission optimization conditions; if yes, confirming the actual cold state level of the engine based on the current engine water temperature; matching the target emission optimization mode of the engine in combination with the current starting parameters of the vehicle; generating at least one preheating action of the engine according to the target emission optimization mode and executing the at least one preheating action until the engine meets corresponding exit standards. According to the 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 in combination with the vehicle information for different cold state levels, so that the preheating of the engine under different conditions can be adaptively realized, the starting temperature of the engine can be efficiently improved, the emission amount under the cold starting condition of the engine can be reduced, the engine wear probability can be reduced, and the 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 and device and vehicle. BACKGROUND

[0002] For an extended-range hybrid vehicle, cold starting in a low-temperature environment can result in incomplete fuel combustion, leading to increased emissions, and the three-way catalyst responsible for exhaust treatment cannot fully function, and residual catalyst can cause exhaust pollution and exacerbate wear of engine bearings, valves and other parts.

[0003] In related technologies, the three-way catalyst can be controlled to reach a working temperature to perform emission treatment during cold starting, or the exhaust state and temperature of the vehicle's internal combustion engine can be used to determine whether to perform a corresponding auxiliary heating function on the engine.

[0004] However, in related technologies, when the three-way catalyst does not reach the working temperature, the harmful exhaust gas remaining therein is directly discharged into the atmosphere, causing increased vehicle exhaust pollution, and regional division of engine temperature cannot be achieved, targeted optimization of starting emissions cannot be achieved according to different cold starting conditions of the engine, and classification management of engine starting emissions optimization is difficult to achieve, leading to increased vehicle energy consumption and emissions, insufficient practicality and intelligence, and the like. SUMMARY

[0005] The present application provides an engine start control method, device and vehicle to solve the problems in related technologies, such as when the three-way catalyst does not reach the working temperature, the harmful exhaust gas remaining therein is directly discharged into the atmosphere, causing increased vehicle exhaust pollution, and regional division of engine temperature cannot be achieved, targeted optimization of starting emissions cannot be achieved according to different cold starting conditions of the engine, and classification management of engine starting emissions optimization is difficult to achieve, leading to increased vehicle energy consumption and emissions, insufficient practicality and intelligence, and the like.

[0006] The first aspect of the present application provides an engine start control method, comprising the following steps: obtaining the current engine water temperature of a vehicle, detecting whether the vehicle meets a preset range extender starting 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 starting emission optimization condition, confirming an 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 starting 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, controlling the vehicle to perform the at least one preheating action until the engine meets the exit standard corresponding to the target emission optimization mode.

[0007] Optionally, in an embodiment of the present application, the matching the target emission optimization mode of the engine based on the current starting parameter of the vehicle and the actual cold state level comprises: obtaining a first comparison result of a medium-high cycle water temperature difference of the engine and a preset temperature difference threshold based on the current starting parameter; obtaining a second comparison result of a vehicle speed and a preset vehicle speed threshold based on the current starting parameter; and confirming the target emission optimization mode by using the actual cold state level, the first comparison result and the second comparison result.

[0008] Optionally, in an embodiment of the present application, the confirming the target emission optimization mode by using the actual cold state level, the first comparison result and the second comparison result comprises: determining that the target emission optimization mode is a preset first emission optimization mode when the first comparison result is that the medium-high cycle water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is a normal cold state level; determining that the target emission optimization mode is a preset second emission optimization mode when the first comparison result is that the medium-high cycle 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 cycle 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; and determining that the target emission optimization mode is a preset third emission optimization mode when the first comparison result is that the medium-high cycle 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.

[0009] Optionally, in an embodiment of the present application, before obtaining the current engine water temperature of the vehicle, the method further comprises: determining whether at least one target sensor of the vehicle satisfies a preset fault condition; and in a case where the at least one target sensor of the vehicle satisfies the preset fault condition, generating fault alarm information based on the at least one target sensor satisfying the preset fault condition, and controlling at least one interactive device of the vehicle to send the fault alarm information.

[0010] The second aspect embodiment of the application provides an engine starting control device, comprising: a detection module configured to obtain a current engine water temperature of a vehicle, and detect whether the vehicle meets a preset range extender starting emission optimization condition according to the current engine water temperature; a confirmation module configured to, in a case where it is detected that the vehicle meets the preset range extender starting emission optimization condition, confirm an actual cold state level of an engine based on the current engine water temperature; and a control module configured to match a target emission optimization mode of the engine based on a current starting parameter 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 an exit standard corresponding to the target emission optimization mode.

[0011] Optionally, in an embodiment of the application, the control module comprises: a first acquisition unit configured to acquire a first comparison result of a medium-high cycle water temperature difference of the engine and a preset temperature difference threshold based on the current starting parameter; a second acquisition unit configured to acquire a second comparison result of a vehicle speed and a preset vehicle speed threshold based on the current starting parameter; and a confirmation unit configured to confirm the target emission optimization mode by using the actual cold state level, the first comparison result, and the second comparison result.

[0012] Optionally, in an embodiment of the application, the confirmation unit is specifically configured to: in a case where the first comparison result is that the medium-high cycle water temperature difference is greater than or equal to the preset temperature difference threshold and the actual cold state level is a regular cold state level, determine that the target emission optimization mode is a preset first emission optimization mode; in a case where the first comparison result is that the medium-high cycle 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 in a case where the first comparison result is that the medium-high cycle 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 a preset second emission optimization mode; and in a case where the first comparison result is that the medium-high cycle 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 a preset third emission optimization mode.

[0013] Optionally, in an embodiment of the present application, the device further comprises a judging module configured to judge whether the vehicle has at least one target sensor satisfying a preset fault condition before acquiring the current engine water temperature of the vehicle; and an alarm module configured to generate fault alarm information based on the at least one target sensor satisfying the preset fault condition and control at least one interactive device of the vehicle to send the fault alarm information in a case where the vehicle has the at least one target sensor satisfying the preset fault condition.

[0014] The third aspect embodiment 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, and the processor executes the program to implement the engine start control method as described in the above embodiments.

[0015] The fourth aspect embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the engine start control method as described above.

[0016] The fifth aspect embodiment of the present application provides a computer program product, comprising a computer program, and the computer program is executed to implement the engine start control method as described above.

[0017] The embodiments of the present application can confirm the engine cold state level by monitoring the engine heat load state, and obtain the corresponding optimization mode in combination with the vehicle information for different cold state levels, to adaptively implement the engine preheating under different conditions, thereby efficiently improving the engine start temperature, reducing the emission amount under the engine cold start condition, and reducing the engine wear probability, with stronger intelligence and practicality. Thus, the problems in the related art that the harmful exhaust gas remaining in the three-way catalyst is directly discharged into the atmosphere when the three-way catalyst does not reach the working temperature, the vehicle exhaust pollution is aggravated, the engine temperature cannot be divided into regions, the start emission cannot be optimized according to different engine cold start conditions, the classification management of the engine start emission optimization is difficult to implement, the vehicle energy consumption and emission are increased, and the practicality and intelligence are insufficient, etc. are solved.

[0018] Additional aspects and advantages of the present application will be made apparent from the following description of the embodiments of the present application, which will be described in the following description of the embodiments of the present application, which will be described in the following description of the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

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

[0020] Figure 1 is a flowchart of an engine start control method according to an embodiment of the present application.

[0021] Figure 2 Logic diagram of cold start emission optimization of extended-range vehicle as an embodiment of the present application;

[0022] Figure 3 Structure diagram of engine start control device according to an embodiment of the present application;

[0023] Figure 4 Structure diagram of vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar notations used throughout the drawings and the specific embodiments described herein 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 explain the present application, and cannot be understood as limiting the present application.

[0025] The engine start control method, device and vehicle of the embodiments of the present application are described below with reference to the accompanying drawings. In the related art mentioned in the above background art, when the three-way catalyst does not reach the working temperature, the harmful exhaust gas remaining therein will be directly discharged into the atmosphere, causing the vehicle exhaust pollution to intensify, and the engine temperature cannot be divided regionally, the start emission cannot be optimized according to different cold start conditions of the engine, and the classification management of the engine start emission optimization is difficult to achieve, resulting in the increase of the vehicle energy consumption and emission, and the lack of 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 heat load state, and the corresponding optimization mode can be obtained according to the vehicle information for different cold state levels, so as to adaptively realize the engine preheating under different conditions, thereby efficiently improving the engine start temperature, reducing the emission amount under the engine cold start condition, and reducing the engine wear probability, and the intelligence and practicality are stronger. Thus, the problems such as the harmful exhaust gas remaining in the three-way catalyst being directly discharged into the atmosphere when the three-way catalyst does not reach the working temperature, causing the vehicle exhaust pollution to intensify, and the engine temperature cannot be divided regionally, the start emission cannot be optimized according to different cold start conditions of the engine, and the classification management of the engine start emission optimization is difficult to achieve, resulting in the increase of the vehicle energy consumption and emission, and the lack of practicality and intelligence in the related art are solved.

[0026] Specifically, Figure 1 A flow diagram of an engine start control method according to an embodiment of the present application is shown.

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

[0028] In step S101, the current engine water temperature of the vehicle is acquired, and whether the vehicle meets a preset range extender starting emission optimization condition is detected according to the current engine water temperature.

[0029] It should be noted that the preset range extender starting emission optimization condition can be set by those skilled in the art according to actual conditions, which is not specifically limited here.

[0030] It can be understood that in the embodiments of the present application, the current engine water temperature can be the current temperature of the engine circulating water circuit. The verification of the preset range extender starting emission optimization condition can be performed by acquiring the current temperature TOH of the engine circulating water circuit and the first cold start temperature threshold TOH min1 are compared, if TOH > TOH min1 , it is considered that the current engine water temperature is at normal temperature or above, that is, it is determined that the start is a normal temperature start, and if TOH ≤ TOH min1 , it is indicated that the engine operating temperature is low, the start is a cold start, and the engine circulating water needs to be preheated, and it is determined that the vehicle meets the preset range extender starting emission optimization condition.

[0031] Alternatively, in an embodiment of the present application, before acquiring the current engine water temperature of the vehicle, it further includes: judging whether at least one target sensor of the vehicle meets a preset fault condition; in the case that at least one target sensor of the vehicle meets the preset fault condition, generating a fault alarm information based on the at least one target sensor meeting 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 condition can be set by those skilled in the art according to actual conditions, which is not specifically limited here.

[0033] In actual execution process, the at least one target sensor can include an electric engine water temperature sensor, an electric motor circulating water circuit temperature sensor, an engine speed sensor, a vehicle speed monitoring sensor, etc., by checking whether the electric engine water temperature sensor, the electric motor circulating water circuit temperature sensor, the engine speed sensor, and the vehicle speed monitoring sensor monitoring function are normal after the vehicle is powered on, if normal, the next step is entered. If there is at least one target sensor failure, an alarm is given, and a fault mode is entered, a fault alarm information is generated according to the fault sensor, and at least one interactive device of the vehicle is controlled to send the fault alarm information to remind the passenger. Further, the fault code can be displayed and an alarm is given, the vehicle is ensured to be powered off under high pressure, and the vehicle is parked.

[0034] In step S102, in the case that it is detected that the vehicle meets the preset range extender starting emission optimization condition, the actual cold state 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 state level of the engine can be determined by the cold degree of the current engine water temperature, and the cold state level can include low, medium and high levels of water temperature, which helps to determine the demand and degree of engine preheating.

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

[0037] It can be understood that in the embodiments of the present application, the target emission optimization mode can correspond to different preheating schemes, for example, emission optimization mode A, emission optimization mode B and emission optimization mode C can be set. Under the condition of emission optimization mode A, the preheating action can include interconnection and intercommunication of medium-high temperature circulating water paths, and the medium temperature water of the motor enters the circulating water of the engine in the cold state to preheat the engine; under the condition of emission optimization mode B, the preheating action can include interconnection and intercommunication of medium-high temperature circulating water paths, and the medium temperature water of the motor enters the circulating water of the engine in the cold state, and the generator starts to work and generates heat itself, and the generator system adopts a low-efficiency heating working mode; under the condition of emission optimization mode C, the medium-high temperature circulating water paths are independently circulated, and the generator starts to work and generates heat itself, and the generator system adopts a low-efficiency heating working mode.

[0038] Further, the exit standards corresponding to the emission optimization mode A, the emission optimization mode B and the emission optimization mode C are different. The evaluation standard for exiting the emission optimization mode A is TOM-TOH≤△T2, and△T2 adopts a small value, such as△T1=1℃-3℃, that is, the temperature difference of the two circulating water paths is small. The evaluation standard for exiting the emission optimization mode B is TOM-TOH≤△T2, and the three-way catalyst has started to work. The evaluation standard for exiting the emission optimization mode C is that the three-way catalyst has started to work. After detecting that the vehicle meets the exit standard corresponding to the target emission optimization mode, the optimization is ended and the emission optimization mode is exited.

[0039] Specifically, for the working process and the exit process of the three exemplary emission optimization modes, the connection 4-way valve of the medium-high water path can be adjusted according to different operating conditions of the vehicle to realize the intercommunication of the medium-high circulating water paths, and by reasonably utilizing the heat source water of the medium temperature circulating water path to directly enter the high temperature circulating water path of the engine in the cold state, the preheating of the engine can be achieved, the problem of too low engine starting temperature can be solved, and the starting emission can be improved. The specific content is as follows:

[0040] Start-up emission optimization mode A: This mode is mainly based on the temperature of the medium-high temperature circulating water in the motor being much higher than that of the high temperature circulating water in the cold engine. At this time, the medium-high temperature circulating water is routed from the original independent operation to the series interconnection form through the highly integrated thermal management system of the range extender. The two circulating water circuits become one large circulating water circuit. Further details are as follows: 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 motor medium temperature water; then the engine water pump works at the preset small circulating N_wp (medium temperature and high temperature circulating water series interconnection, engine water pump preset small circulating speed) speed, and the medium temperature circulating water with a temperature much higher than that of the cold engine water is introduced into the engine small circulating water circuit, so as to rapidly increase the engine temperature and avoid cold start of the engine, and the cold water in the high temperature circulating water circuit enters the motor medium temperature circulating water to improve the motor performance.

[0041] Start-up emission optimization mode B: This mode is mainly based on the fact that the engine temperature is at an extremely low temperature or the temperature difference between the medium-high temperature circulating water is not particularly large, and the vehicle is running. Therefore, on the basis of the emission optimization mode A, the generator system low efficiency high heat mode is added. The motor generally operates in the best current map, at which the motor can output maximum power at minimum current, at which the efficiency is the highest and the motor heating is the lowest. The motor system adopts Map_GH (conventional high efficiency power generation working Map of the generator system) operation. In order to improve the thermal load of the motor, a low efficiency high heat mode Map_GL (low efficiency power generation working Map of the generator system) is calibrated in the motor development process. At this time, the motor operates for the purpose of outputting medium-high thermal load, so as to rapidly increase the motor water temperature, and the motor water temperature after temperature increase enters the circulating water circuit of the cold engine. Therefore, in this mode, the engine works according to the initial circulating water temperature TOH min2 ≤TOH≤TOH min1 or TOH≤TOH min2 respectively according to the preset Map_El1 (engine low temperature TOH min2 ≤TOH≤TOH min1 preset cold start optimal emission operating condition Map) and Map_El2 (engine extremely low temperature TOH≤TOH min2 preset cold start optimal emission operating condition Map), and generates heat itself, while the generator works in the low efficiency high heat mode Map_GL and cooperates with the medium-high temperature circulating water circuit of the optimization mode A to switch to the series interconnection form. Based on this double multiple heating mode, the problem of insufficient preheating heat of the engine or medium temperature water at an extremely low temperature can be solved.

[0042] Start-up emission optimization mode C: This mode is mainly aimed at the state that the temperature difference of medium-high circulating water is close, and all are low temperature. The vehicle has not been running, such as overnight travel in winter. At this time, it is not possible to directly switch the medium-high circulating water circuit to series interconnection preheat the cold engine, that is, the medium-high circulating water circuit circulates independently. Therefore, when the range extender receives the power generation mode instruction, only the engine normal start-up work preheats itself, and the low-efficiency high-heat mode (Map_GL is executed) of the generator system heats the medium-temperature circulating water. The main purpose is to preheat the battery (not described here). Therefore, under this mode, the engine starts work according to the initial circulating water temperature TOH min2 ≤TOH≤TOH min1 or TOH≤TOH min2 respectively according to the preset Map_El1 and Map_El2 working conditions.

[0043] Exit preheating mode A: This mode is to preheat the high-temperature circulating water of the engine in the cold state by the medium-temperature circulating water. The evaluation criterion is the temperature difference threshold of the two water circuits. During the operation of this mode, the medium-high temperature circulating water temperature difference is monitored every interval period t. When the medium-high temperature circulating water temperature difference TOM-TOH≤△T2, it is considered that the temperature difference of the two is small, that is, the start-up emission optimization mode A is exited.

[0044] Exit preheating mode B: This mode is to preheat the high-temperature circulating water of the engine in the cold state by the medium-temperature circulating water, and to preheat the engine by combining the engine cold start (according to Map_El1 or Map_El2) and the low-efficiency high-heat mode (Map_GL is executed) of the range extender generator system to improve the cold start emission problem. The evaluation criterion is the temperature difference threshold of the two water circuits and the engine three-way catalyst working state CAT_s (three-way catalyst working state information feedback). During the operation of this mode, the medium-high temperature circulating water temperature difference is monitored every interval period t. When the medium-high temperature circulating water temperature difference TOM-TOH≤△T2, and CAT_s=1 (the catalyst has started to work), that is, the start-up emission optimization mode B is exited, and the range extender generator system running map is switched to Map_GH. CAT_s=0 represents that the catalyst has not reached the light-off temperature, that is, it has not started to work.

[0045] Exit preheating mode C: this mode is because the medium-high temperature circulating water is in a low temperature state, and cannot be improved by the interconnection of the two circulating water, that is, the medium-high temperature circulating water circuit is independently circulated, so it can only be cold started (according to Map_El1 or Map_El2) and preheated by itself, and the low-efficiency high-heat mode (according to Map_GL) of the generator system preheats the high-temperature circulating water, the main purpose of which is to preheat the battery, which is not described here. Therefore, the evaluation criterion is the working state CAT_s of the engine three-way catalyst; during the operation of this mode, the three-way catalyst working state CAT_s is monitored every interval period t, and when CAT_s = 1, the start-up emission optimization mode C is exited, and the map of the range-extending generator system is switched to Map_GH.

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

[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 the actual situation, and are not specifically limited here.

[0048] In actual execution, the preset temperature difference threshold can be a medium-high circulating water temperature difference threshold, the difference between the motor medium temperature circulating water temperature TOM and the engine water temperature TOH is obtained, and it is judged whether TOM-TOH≥△T1 exists, if yes, the target emission optimization mode is matched according to the actual cold state level obtained by the engine, otherwise, the target emission optimization mode is matched based on the vehicle speed of the vehicle. The vehicle speed V can be read by the vehicle VCU, and the corresponding emission optimization mode is confirmed according to the different size relationship between the vehicle speed and the preset vehicle speed threshold.

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

[0050] It should be noted that the preset first emission optimization mode, preset second emission optimization mode and preset third emission optimization mode can be set by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0051] In actual implementation, the current engine coolant temperature (TOH), i.e., the current temperature of the engine circulating water circuit, can be compared with the second cold start temperature threshold (TOH). min2 Compare them. If TOH min2 ≤TOH≤TOH min1 This indicates that the engine operating temperature is low, the start-up is a normal cold start, the engine coolant needs to be preheated, and the actual cold start level is a normal cold start level; if TOH ≤ TOH min2 This indicates that the engine operating temperature is extremely low, the start-up is an extreme cold start, and the engine coolant requires a high degree of preheating; the actual cold-state level is an extreme cold-state level. Therefore, corresponding emission optimization modes are matched according to different cold-state levels.

[0052] For example, a preset first emission optimization mode may include interconnected medium- and high-temperature circulating water circuits, with warm water from the motor entering the engine's circulating water system (which is currently in a cold state) to preheat the engine. A preset second emission optimization mode may include interconnected medium- and high-temperature circulating water circuits, with warm water from the motor entering the engine's circulating water system (which is currently in a cold state), while the generator starts operating and generates its own heat; the generator system operates in an inefficient heating mode. A preset third emission optimization mode involves independent circulation of the medium- and high-temperature circulating water circuits, while the generator starts operating and generates its own heat; the generator system operates in an inefficient heating mode.

[0053] like Figure 2 As shown below, the working content of the embodiment of this application will be described in detail with a specific example.

[0054] First, after the vehicle is powered on, check whether the electric engine water temperature sensor, the motor circulating water temperature sensor, the engine speed sensor, and the vehicle speed monitoring sensor are normal, and if so, proceed to the next step, and if not, report an error and enter a fault mode, display the fault code, and report an error. The vehicle is powered off under high pressure, and the vehicle is parked.

[0055] Obtain the current temperature TOH of the engine circulating water and the cold start temperature threshold TOH min1 and TOH min2 Compare and determine the current temperature TOH of the engine circulating water: if TOH > TOH min1 , the engine temperature is at room temperature or above, and the start is a normal temperature start; if TOH min2 ≤ TOH ≤ TOH min1 , the engine operating temperature is too low, the start is a cold start, and the engine circulating water needs to be preheated, then enter the range extender start emission optimization mode requirement determination; if TOH ≤ TOH min2 , 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 enter the range extender start emission optimization mode requirement determination.

[0056] Determine the range extender start emission optimization mode requirement. According to 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), and the engine and vehicle operating state, determine the emission optimization requirement for cold start.

[0057] If the speed n = 0, the vehicle speed V > 0, TOH min2 ≤ TOH ≤ TOH min1 , normal cold start, and the medium-high circulating water temperature difference is greater than or equal to the set threshold (TOM-TOH ≥ ΔT1), which represents the vehicle is running in pure electric mode, and the medium-temperature water is much higher than the engine circulating water in cold state. If an instruction to enter or predict to enter the range extension power generation mode is received, start the emission optimization mode A.

[0058] If the speed n = 0, the vehicle speed V > 0, TOH ≤ TOH min2 (engine temperature is extremely low), and the medium-high circulating water temperature difference is greater than or equal to the set threshold (TOM-TOH ≥ ΔT1), which represents the vehicle is running in pure electric mode, and the medium-temperature water is much higher than the engine circulating water in cold state. If an instruction to enter or predict to enter the range extension power generation mode is received, start the emission optimization mode B.

[0059] If the speed n = 0, the vehicle speed V > 0, and the medium-high cycle water temperature difference is less than the threshold value (TOM-TOH < ΔT1) at this time, it represents that the vehicle is running in the positive pure electric mode, and it has just started running for a short time, and the medium temperature water and the engine circulating water temperature under cold state are small. If the instruction to enter or predict to enter the extended range power generation mode is received, the emission optimization mode B is started to run.

[0060] If the speed n = 0, the vehicle speed V = 0, and TOH min2 ≤TOH≤TOH min1 , the normal cold start, and the medium-high cycle water temperature difference is greater than or equal to the threshold value (TOM-TOH ≥ ΔT1) at this time, it represents that the vehicle is running in the pure electric mode after parking, and the medium temperature water is already much higher than the engine circulating water under cold state. If the instruction to enter or predict to enter the extended range power generation mode is received, the emission optimization mode A is started to run.

[0061] If the speed n = 0, the vehicle speed V = 0, and TOH min2 (engine temperature is extremely low), and the medium-high cycle water temperature difference is greater than or equal to the threshold value (TOM-TOH ≥ ΔT1) at this time, it represents that the vehicle is running in the pure electric mode after parking, and the medium temperature water is already much higher than the engine circulating water under cold state. If the instruction to enter or predict to enter the extended range power generation mode is received, the emission optimization mode B is started to run.

[0062] If the speed n = 0, the vehicle speed V = 0, and the medium-high cycle water temperature difference is less than the threshold value (TOM-TOH < ΔT1) at this time, it represents 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 under cold state. If the instruction to enter or predict to enter the extended range power generation mode is received, the emission optimization mode C is started to run.

[0063] The extended range device starts the emission optimization mode. The emission optimization mode A: the medium-high temperature circulating water circuit is interconnected and coordinated, the medium temperature water of the motor enters the engine circulating water under cold state, and the engine is preheated. The emission optimization mode B: the medium-high temperature circulating water circuit is interconnected and coordinated, the medium temperature water of the motor enters the engine circulating water under cold state, and the engine is preheated. The engine is preheated according to the initial circulating water temperature TOH min2 ≤TOH≤TOH min1 or TOH≤TOH min2 respectively according to the preset Map_El1 and Map_El2 working conditions, and the generator system adopts the low-efficiency heating working mode. The emission optimization mode C: the medium-high temperature circulating water circuits are independent of each other, and the engine is preheated according to the initial circulating water temperature TOH min2 ≤TOH≤TOH min1 or TOH≤TOH min2 respectively according to the preset Map_El1 and Map_El2 working conditions, and the generator system adopts the low-efficiency heating working 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 catalyst begins to work, different exit preheating evaluation criteria are adopted in different start-up emission optimization modes

[0065] According to the engine start-up control method provided in the embodiments of the present application, the engine cold state level can be confirmed by monitoring the engine thermal load state, and the corresponding optimization mode can be obtained in combination with the vehicle information for different cold state levels, so that the engine preheating in different situations is adaptively realized, thereby efficiently improving the engine start-up temperature, reducing the emission amount in the engine cold start-up situation, reducing the engine wear probability, and being more intelligent and practical. Therefore, the problems in the related art that when the three-way catalyst does not reach the working temperature, the harmful exhaust gas remaining therein is directly discharged into the atmosphere, the vehicle exhaust pollution is aggravated, the engine temperature cannot be regionally divided, the start-up emission cannot be optimized according to different engine cold start-up conditions, the classification management of the engine start-up emission optimization is difficult to realize, the vehicle energy consumption and emission are increased, and the practicality and intelligence are insufficient are solved.

[0066] Secondly, the engine start-up control device provided in the embodiments of the present application is described with reference to the accompanying drawings.

[0067] Figure 3 is a structural schematic diagram of the engine start-up control device in the embodiments of the present application.

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

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

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

[0071] The control module 300 is configured to match the target emission optimization mode of the engine based on the current start-up parameter and the actual cold state level of the vehicle, generate at least one preheating action of the engine according to the target emission optimization mode, control the vehicle to perform the at least one preheating action, and stop until the engine meets the exit standard corresponding to the target emission optimization mode.

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

[0073] The first obtaining unit is configured to obtain a first comparison result of a medium-high circulating water temperature difference of the engine and a preset temperature difference threshold based on the current starting parameter.

[0074] The second obtaining unit is configured to obtain a second comparison result of a vehicle speed and a preset vehicle speed threshold based on the current starting parameter.

[0075] The confirming unit is configured 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 an embodiment of the present application, the confirming unit is specifically configured to: determine the target emission optimization mode as a 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 a regular cold state level; determine the target emission optimization mode as a preset second 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; and determine the target emission optimization mode as a preset third 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.

[0077] Optionally, in an embodiment of the present application, the device 10 further comprises an alarm module and a judging module.

[0078] The judging module is configured to judge whether at least one target sensor of the vehicle satisfies a preset fault condition before obtaining the current engine water temperature of the vehicle.

[0079] The alarm module is configured to generate fault alarm information based on the at least one target sensor satisfying the preset fault condition, and control at least one interactive device of the vehicle to send the fault alarm information when the at least one target sensor of the vehicle satisfies the preset fault condition.

[0080] It should be noted that the foregoing explanation and description of the engine starting control method embodiment are also applicable to the engine starting control device of the embodiment, and thus will not be described herein again.

[0081] According to the engine start control device provided by the embodiment of the present application, the engine cold state level can be confirmed by monitoring the engine thermal load state, and the corresponding optimization mode can be obtained in combination with the vehicle information for different cold state levels, so that the engine preheating in different situations is adaptively realized, the engine start temperature is efficiently improved, the emission amount in the engine cold start condition is reduced, the engine wear probability is reduced, and the intelligence and practicality are stronger. Therefore, the problems in the related art that when the three-way catalyst does not reach the working temperature, the harmful tail gas remaining therein is directly discharged into the atmosphere, the vehicle tail gas pollution is aggravated, the engine temperature cannot be divided into regions, the targeted optimization of the start emission cannot be realized according to different engine cold start conditions, the classification management of the engine start emission optimization is difficult to realize, the vehicle energy consumption and emission are increased, and the practicality and intelligence are insufficient are solved.

[0082] Figure 4 The vehicle structure schematic diagram provided by the embodiment of the present application is provided. The vehicle can include:

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

[0084] The processor 402 implements the engine start control method provided in the above embodiment when executing the program.

[0085] Further, the vehicle further 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 the computer program executable on the processor 402.

[0088] The memory 401 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, 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 with each other through a bus and complete communication between 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, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 4 Only one thick line is used to represent the bus in the figure, but it 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 complete communication between each other through an internal interface.

[0091] The processor 402 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement one or more embodiments of the present application.

[0092] The embodiment further provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the engine start control method.

[0093] The embodiment further provides a computer program product, which includes a computer program, and the computer program is executed to implement the engine start control method.

[0094] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, the usage of "N" means at least two, for example, two, three or the like, unless explicitly stated otherwise.

[0095] Furthermore, the terms "first", "second", or the like, are used only to describe the different features and do not imply or suggest relative importance of, or a number of, the indicated technical features. Thus, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the application, "N" means at least two, for example, two, three, etc., unless explicitly specified otherwise.

[0096] Any process or method descriptions or descriptions of the flow diagrams in the present application can be understood as representing code modules, segments, or portions of code which include one or more executable instructions for performing specific logic functions or steps in the process, and that the various systems described herein can include one or more circuits, or other means for performing the functions described in conjunction with the different aspects. In some embodiments, the various processes and methods described herein can be embodied in machine-executable code, which can be written in any of a number of suitable programming languages or environments.

[0097] The logic and / or steps represented in the flowcharts and / or described herein, for example, can be considered as a sequence of executable instructions stored in a computer readable medium, which can be executed by an instruction execution system, apparatus or device, such as a computer-based system, a processor-based system, or other system that can fetch the instructions from the instruction execution system, apparatus or device and execute the instructions, or a combination of the above. For the purposes of this specification, a "computer readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus or device. The computer readable medium can be a computer readable storage medium or a computer readable signal medium. The computer readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a propagation medium. The computer readable signal medium can include, but is not limited to, a computer readable medium that facilitates transfer of the program from one place to another. A specific example of a computer readable medium is a non-transitory computer-readable storage medium. A specific example of a computer readable signal medium is a source or destination of the computer readable medium. Another specific example of a computer readable signal medium is a computer readable signal travelling through space. Thus, a computer readable medium can take many forms of hardware to carry out the program for use by or in connection with the instruction execution system, apparatus or device.

[0098] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As such, if implemented in hardware, and in another embodiment, any of the following technologies, known in the art, or their combinations can be used: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0099] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiment methods can be completed by programs instructing related hardware, and the programs can be stored in a computer readable storage medium. When the programs are executed, one or a combination of the steps of the method embodiments is included.

[0100] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0101] The storage medium mentioned above can 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 should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An engine starting control method, characterized in that, Includes the following steps: The current engine coolant temperature of the vehicle is obtained, and the vehicle is checked to see if it meets the preset emission optimization conditions for range extender start-up based on the current engine coolant temperature. If the vehicle is found to meet the preset range extender start emission optimization conditions, the actual cold state level of the engine is confirmed based on the current engine coolant temperature. Based on the vehicle's current startup parameters and the actual cold state level, the engine's target emission optimization mode is matched, and at least one preheating action of the engine is generated according to the target emission optimization mode. The vehicle is controlled to execute the at least one preheating action until the engine meets the exit criteria corresponding to the target emission optimization mode. The verification of the preset range extender start-up emission optimization conditions is achieved by comparing the current temperature TOH of the engine circulating water circuit with the first cold start temperature threshold TOHmin1 during the start-up process of the range-extended hybrid vehicle. If TOH > TOHmin1, the current engine water temperature is considered to be above normal temperature, and the start-up is determined to be a normal temperature start-up. If TOH ≤ TOHmin1, it indicates that the engine operating temperature is low, the start-up is a cold start, the engine circulating water needs to be preheated, and the vehicle is determined to meet the preset range extender start-up emission optimization conditions. The target emission optimization mode includes a preset first emission optimization mode, a preset second emission optimization mode, and a preset third emission optimization mode; The first preset emission optimization mode includes interconnected medium- and high-temperature circulating water circuits, with warm water from the motor entering the engine's circulating water in a cold state to preheat the engine; the second preset emission optimization mode includes interconnected medium- and high-temperature circulating water circuits, with warm water from the motor entering the engine's circulating water in a cold state, while the generator starts working and generates its own heat, and the generator system adopts an inefficient heating mode; the third preset emission optimization mode involves independent circulation of the medium- and high-temperature circulating water circuits, while the generator starts working and generates its own heat, and the generator system adopts the inefficient heating mode.

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

3. The method according to claim 2, characterized in that, The step of confirming the target emission optimization mode using the actual cold state level, the first comparison result, and the second comparison result includes: If the first comparison result is that the temperature difference of the medium-high temperature circulating water is greater than or equal to the preset temperature difference threshold and the actual cold state level is the conventional cold state level, then the target emission optimization mode is determined to be the preset first emission optimization mode. If the first comparison result is that the temperature difference of the medium-high temperature circulating water is greater than or equal to the preset temperature difference threshold and the actual cold state level is the extreme cold state level, or if the first comparison result is that the temperature difference of the medium-high temperature circulating water 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, then the target emission optimization mode is determined to be the preset second emission optimization mode. If the first comparison result is that the temperature difference of the medium-high temperature circulating water 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, then the target emission optimization mode is determined to be the preset third emission optimization mode.

4. The method according to claim 1, characterized in that, Before obtaining the vehicle's current engine coolant temperature, the following is also included: Determine whether at least one target sensor in the vehicle meets a preset fault condition; If at least one target sensor in the vehicle satisfies the preset fault condition, a fault alarm message 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 message.

5. An engine starting control device, characterized in that, include: The detection module is used to obtain the current engine coolant temperature of the vehicle and detect whether the vehicle meets the preset emission optimization conditions for range extender start-up based on the current engine coolant temperature. The confirmation module is used to confirm the actual cold state level of the engine based on the current engine coolant temperature when the vehicle is detected to meet the preset range extender start-up emission optimization conditions. The control module is used to match the target emission optimization mode of the engine based on the current start 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 execute the at least one preheating action until the engine meets the exit criteria corresponding to the target emission optimization mode. The verification of the preset range extender start-up emission optimization conditions is achieved by comparing the current temperature TOH of the engine circulating water circuit with the first cold start temperature threshold TOHmin1 during the start-up process of the range-extended hybrid vehicle. If TOH > TOHmin1, the current engine water temperature is considered to be above normal temperature, and the start-up is determined to be a normal temperature start-up. If TOH ≤ TOHmin1, it indicates that the engine operating temperature is low, the start-up is a cold start, the engine circulating water needs to be preheated, and the vehicle is determined to meet the preset range extender start-up emission optimization conditions. The target emission optimization mode includes a preset first emission optimization mode, a preset second emission optimization mode, and a preset third emission optimization mode; The first preset emission optimization mode includes interconnected medium- and high-temperature circulating water circuits, with warm water from the motor entering the engine's circulating water in a cold state to preheat the engine; the second preset emission optimization mode includes interconnected medium- and high-temperature circulating water circuits, with warm water from the motor entering the engine's circulating water in a cold state, while the generator starts working and generates its own heat, and the generator system adopts an inefficient heating mode; the third preset emission optimization mode involves independent circulation of the medium- and high-temperature circulating water circuits, while the generator starts working and generates its own heat, and the generator system adopts the inefficient heating mode.

6. The apparatus according to claim 5, characterized in that, The control module includes: The first acquisition unit is used to acquire a first comparison result between the medium-high temperature difference of the engine's circulating water and a preset temperature difference threshold based on the current start parameters. 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 parameters; The confirmation unit is used to confirm the target emission optimization mode using the actual cold state level, the first comparison result, and the second comparison result.

7. The apparatus according to claim 6, characterized in that, The confirmation unit is specifically used for: If the first comparison result is that the temperature difference of the medium-high temperature circulating water is greater than or equal to the preset temperature difference threshold and the actual cold state level is the conventional cold state level, then the target emission optimization mode is determined to be the preset first emission optimization mode. If the first comparison result is that the temperature difference of the medium-high temperature circulating water is greater than or equal to the preset temperature difference threshold and the actual cold state level is the extreme cold state level, or if the first comparison result is that the temperature difference of the medium-high temperature circulating water 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, then the target emission optimization mode is determined to be the preset second emission optimization mode. If the first comparison result is that the temperature difference of the medium-high temperature circulating water 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, then the target emission optimization mode is determined to be the preset third emission optimization mode.

8. The apparatus according to claim 6, characterized in that, Also includes: The judgment module is used to determine whether at least one target sensor of the vehicle meets a preset fault condition before acquiring the current engine coolant temperature of the vehicle. An alarm module is configured to generate a fault alarm message based on at least one target sensor that meets the preset fault condition when the vehicle has at least one target sensor that meets the preset fault condition, and to control at least one interactive device of the vehicle to send the fault alarm message.

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

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

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