Vehicle engine starting judgment method and device

Abstract

The invention discloses a vehicle engine starting judgment method and device, and relates to the technical field of automobiles. The method is applied to a vehicle control unit and comprises the following steps that the rotating speed of an engine is obtained; judging whether the rotating speed of the engine is greater than a rotating speed threshold value or not, if the rotating speed of the engine is greater than the rotating speed threshold value, acquiring an air-fuel ratio of the engine after first preset time, and judging whether the air-fuel ratio of the engine is smaller than an air-fuel ratio threshold value or not; and if the air-fuel ratio is less than the air-fuel ratio threshold, judging that the engine is successfully started. After the engine reaches the preset rotating speed, the air-fuel ratio is introduced, so that the ignition condition of the engine is further judged through the relation between the air-fuel ratio and the preset air-fuel ratio threshold value under the false starting condition that the engine is started and the engine is not started according to the rotating speed, and the accuracy of starting judgment of the engine is improved; the probability of false start of the engine is reduced, and the problems of loss of battery power and after-combustion of fuel are reduced.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a vehicle engine start judgment method and device. Background Art

[0002] The engine start of a PHEV is generally driven by the generator controlled by the GCU. Once the engine speed reaches the set speed, the engine sends a successful start command. However, the actual engine speed may misjudge the start success and the engine fails to ignite successfully. At this time, the battery power is easily exhausted and afterburning occurs, affecting vehicle performance. Summary of the invention

[0003] The present application provides a vehicle engine start judgment method and device to solve the problem that the existing engine judgment is inaccurate, the battery power is easily exhausted and afterburning occurs.

[0004] In a first aspect, the present application provides a vehicle engine start judgment method, which is applied to a vehicle controller and includes the following steps:

[0005] Get the engine speed;

[0006] Determine whether the engine speed is greater than a speed threshold;

[0007] If the engine speed is greater than the speed threshold, obtaining the engine air-fuel ratio after a first preset time;

[0008] Determining whether the air-fuel ratio of the engine is less than an air-fuel ratio threshold;

[0009] If it is less than the air-fuel ratio threshold, the engine is judged to be started successfully.

[0010] When the hybrid vehicle is started, the generator controlled by the GCU provides a large torque to drag the engine to rotate. At this time, the generator controlled by the GCU rotates but does not generate electricity. The generator controlled by the GCU drives the engine to rotate and ignites the engine. After the hybrid vehicle is started, the generator controlled by the GCU will rotate at the target speed and enter the power generation mode. Successful engine ignition will provide energy to drive the generator controlled by the GCU to rotate at the target speed to generate electricity. When the hybrid vehicle is started by mistake, the engine controller determines that the engine speed is greater than the speed threshold and gives a start success signal. The vehicle controller will give the generator controlled by the GCU to run at the target speed. Since the generator controlled by the GCU is connected to the engine through a shaft When the generator controlled by the GCU runs at the target speed, the generator controlled by the GCU drives the engine to rotate through the shaft. At this time, the engine cannot supply energy to the generator controlled by the GCU because the ignition is not successful. The generator controlled by the GCU consumes the electric energy provided by the battery to provide the rotation of the generator controlled by the GCU. Therefore, the generator controlled by the GCU consumes electricity to drive the engine to rotate, and the engine idles. At this time, the generator controlled by the GCU passively drives the engine to rotate. The energy from the rotation of the generator controlled by the GCU does not generate electricity, but is used to drive the engine to rotate, entering a false start power consumption mode, resulting in no power generation but only power consumption. At the same time, a large amount of oil is sprayed into the cylinder and burned in the exhaust pipe, producing aftercombustion.

[0011] When the engine is falsely started, the fuel is not ignited successfully, and the unignited fuel will be discharged to the exhaust gas treatment device for exhaust gas treatment. When a large amount of unburned fuel enters the exhaust gas treatment device, aftercombustion occurs, which damages the catalytic device.

[0012] The present application introduces an air-fuel ratio method after the engine reaches a preset speed. In this way, in the case of a false start when the speed judges that the engine has started but the actual engine has not started, the engine ignition condition is further judged by the relationship between the air-fuel ratio and the preset air-fuel ratio threshold, thereby improving the accuracy of engine start judgment, reducing the probability of false engine start, and reducing battery power loss and fuel afterburning problems.

[0013] The speed threshold may be the industry-wide value of 1300 rpm. The air-fuel ratio threshold may be 1.1, and the first preset time may be 5 to 10 seconds. Since there is a time delay from engine ignition to exhaust gas discharge from the engine, obtaining the air-fuel ratio after the first preset time can reflect the actual ignition condition of the engine.

[0014] In some embodiments, after obtaining the engine speed, the step further includes:

[0015] If the engine speed is less than or equal to the first speed threshold, the control restarts the engine and determines whether the engine is started successfully.

[0016] When the engine speed is not greater than the first speed threshold, it means that the engine has not been started successfully, and an instruction to start the engine can be issued again to determine whether the engine has been started successfully.

[0017] In some embodiments, if the engine speed is less than or equal to the first speed threshold, controlling to restart the engine and determining whether the engine is successfully started further includes:

[0018] Get the number of times the engine has been started;

[0019] Determining whether the number of engine starts is equal to a first threshold;

[0020] If it is equal to the first threshold, the engine is stopped.

[0021] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the introduction of the judgment of the number of restarts can make it possible to stop starting the engine to protect the battery if the engine still fails to start successfully after restarting the first threshold number of times. The first threshold can be 3 to 5 times.

[0022] In some embodiments, after determining whether the engine speed is greater than the speed threshold, the step further includes:

[0023] If the engine speed is less than or equal to the speed threshold, obtain the temperature of the engine cooling water;

[0024] Determine whether the temperature of the engine cooling water is less than a temperature threshold;

[0025] If the temperature of the engine cooling water is less than the temperature threshold, the control restarts the engine and determines whether the engine is started successfully.

[0026] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the engine cooling water temperature is introduced to judge. When the temperature of the engine cooling water is lower than the temperature threshold, the engine can be started again. That is, the engine combustion time is shorter at low water temperature, and the heat transferred to the catalyst end is less, which causes less damage to the catalyst. The temperature threshold can be 50-70°C, preferably 60°C.

[0027] In some embodiments, if the temperature of the engine cooling water is less than the temperature threshold, the control restarts the engine, and after determining whether the engine is successfully started, the method further includes:

[0028] Get the number of times the engine has been started;

[0029] determining whether the number of engine starts is equal to a second threshold;

[0030] If it is equal to the second threshold, the engine is stopped.

[0031] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the engine cooling water temperature is introduced to judge. When the temperature of the engine cooling water is less than the temperature threshold, the engine can be started again. That is, the engine combustion time is less at low water temperature, and the heat transferred to the catalyst end is less, which causes less damage to the catalyst. At this time, multiple starts are allowed, but in order to balance the power consumption of the battery, the number of starts is controlled at the second threshold. When the number of starts is less than the second threshold, it is allowed to continue to start. After it is equal to the second threshold, it is not allowed to continue to start and the engine needs to be shut down. The second threshold can be 3 to 5 times.

[0032] In some embodiments, after determining whether the temperature of the engine cooling water is less than the temperature threshold, the method further includes:

[0033] If the temperature of the engine cooling water is greater than or equal to the temperature threshold, the control restarts the engine and determines whether the engine is started successfully;

[0034] Get the number of times the engine has been started;

[0035] determining whether the number of engine starts is equal to a third threshold;

[0036] If it is equal to the third threshold, the engine is stopped.

[0037] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the engine cooling water temperature judgment is introduced. When the temperature of the engine cooling water is greater than the temperature threshold, that is, the engine combustion time is long at high water temperature, the heat transferred to the catalyst end is more, and the damage to the catalyst is greater. The number of times the engine is started can be set to a third threshold. When the number of starts is less than the third threshold, it is allowed to continue to start. When it is equal to the third threshold, it is not allowed to continue to start, and the engine needs to be shut down to protect the catalyst. The second threshold can be 1 to 2 times.

[0038] In some embodiments, after determining whether the air-fuel ratio of the engine is less than the air-fuel ratio threshold, the method further includes:

[0039] If the air-fuel ratio of the engine is greater than or equal to the air-fuel ratio threshold, the control restarts the engine and determines whether the engine is started successfully.

[0040] When any of the engine speed and air-fuel ratio does not meet the threshold, it means that the engine has not started successfully and needs to be restarted.

[0041] In some embodiments, if the air-fuel ratio of the engine is greater than or equal to the air-fuel ratio threshold, controlling to restart the engine and determining whether the engine is successfully started further includes:

[0042] Get the number of times the engine has been started;

[0043] determining whether the number of engine starts is equal to a fourth threshold;

[0044] If the number of engine starts is equal to a fourth threshold, the engine is stopped.

[0045] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the introduction of the judgment of the number of restarts can make the engine stop starting if the engine still fails to start successfully after restarting the fourth threshold number of times to protect the battery. The fourth threshold can be 3 to 5 times.

[0046] In some embodiments, the vehicle engine start determination method is applied to an extended-range vehicle, and before obtaining the engine speed, the method includes:

[0047] The engine start command is issued to control the range extender to start rotating under the drive of the battery and drive the engine to ignite.

[0048] By introducing the air-fuel ratio after the engine reaches the preset speed, in the case of a false start when the speed judges that the engine has started but the actual engine has not started, the engine ignition condition can be further judged by the relationship between the air-fuel ratio and the preset air-fuel ratio threshold, thereby improving the accuracy of engine start judgment, reducing the probability of false engine start, and reducing battery power loss and fuel afterburning problems.

[0049] In a second aspect, the present application provides a vehicle engine start judgment device, comprising:

[0050] A first acquisition module, used to acquire the rotation speed of the engine;

[0051] A first judgment module, used to judge whether the engine speed is greater than a speed threshold;

[0052] A second acquisition module, configured to acquire the air-fuel ratio of the engine after a first preset time if the engine speed is greater than a speed threshold;

[0053] A second judgment module, used to judge whether the air-fuel ratio of the engine is less than an air-fuel ratio threshold;

[0054] The execution module is used to determine that the engine is started successfully if the air-fuel ratio is less than a threshold value.

[0055] The vehicle engine start judgment device can implement the vehicle engine start judgment method of the first aspect, by introducing the air-fuel ratio after the engine reaches a preset speed, so that in the case of a false start when the speed judges that the engine has started but the actual engine has not started, the engine ignition condition is further judged by the relationship between the air-fuel ratio and the preset air-fuel ratio threshold, thereby improving the accuracy of the engine start judgment, reducing the probability of false engine start, and reducing the battery power loss and fuel afterburning problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0057] Figure 1 This is a flow chart of a vehicle engine start determination method according to the first embodiment of the present application.

[0058] Figure 2 This is a flow chart of a vehicle engine start determination method according to a second embodiment of the present application.

[0059] Figure 3 This is a flow chart of a vehicle engine start determination method according to a third embodiment of the present application.

[0060] Figure 4 This is a flow chart of a vehicle engine start determination method according to a fourth embodiment of the present application.

[0061] Figure 5 This is a flow chart of a vehicle engine start determination method according to a fifth embodiment of the present application.

[0062] Figure 6 This is a flow chart of a vehicle engine start determination method according to a sixth embodiment of the present application.

[0063] Figure 7 This is a flow chart of a vehicle engine start determination method according to the seventh embodiment of the present application.

[0064] Figure 8 This is a flow chart of a vehicle engine start determination method according to an eighth embodiment of the present application.

[0065] Fig. 9 This is a flow chart of a vehicle engine start determination method according to a ninth embodiment of the present application.

[0066] Fig.10 A schematic diagram of a vehicle engine start determination device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0068] The engine start of a PHEV is generally driven by the generator controlled by the GCU. Once the engine speed reaches the set speed, the engine sends a successful start command. However, the actual engine speed may misjudge the start success and the engine fails to ignite successfully. At this time, the battery power is easily exhausted and afterburning occurs, affecting vehicle performance.

[0069] In view of this, the present application provides a vehicle engine start judgment method and device to solve the problem that the existing engine judgment is inaccurate, easily exhausts the battery power and produces afterburning.

[0070] First, as Figure 1 As shown, in a first embodiment of the present application, a vehicle engine start judgment method is provided, which is applied to a vehicle controller and includes the following steps:

[0071] S10, obtaining the engine speed;

[0072] S20, determining whether the engine speed is greater than a speed threshold,

[0073] S30: If the engine speed is greater than the speed threshold, the air-fuel ratio of the engine is obtained after a first preset time.

[0074] S40, determining whether the air-fuel ratio of the engine is less than an air-fuel ratio threshold;

[0075] S50: If the air-fuel ratio is less than the air-fuel ratio threshold, it is determined that the engine is started successfully.

[0076] When the hybrid vehicle is started, the generator controlled by the GCU provides a large torque to drag the engine to rotate. At this time, the generator controlled by the GCU rotates but does not generate electricity. The generator controlled by the GCU drives the engine to rotate and ignites the engine. After the hybrid vehicle is started, the generator controlled by the GCU will rotate at the target speed and enter the power generation mode. Successful engine ignition will provide energy to drive the generator controlled by the GCU to rotate at the target speed to generate electricity. When the hybrid vehicle is started by mistake, the engine controller determines that the engine speed is greater than the speed threshold and gives a start success signal. The vehicle controller will give the generator controlled by the GCU to run at the target speed. Since the generator controlled by the GCU is connected to the engine through a shaft When the generator controlled by the GCU runs at the target speed, the generator controlled by the GCU drives the engine to rotate through the shaft. At this time, the engine cannot supply energy to the generator controlled by the GCU because the ignition is not successful. The generator controlled by the GCU consumes the electric energy provided by the battery to provide the rotation of the generator controlled by the GCU. Therefore, the generator controlled by the GCU consumes electricity to drive the engine to rotate, and the engine idles. At this time, the generator controlled by the GCU passively drives the engine to rotate. The energy from the rotation of the generator controlled by the GCU does not generate electricity, but is used to drive the engine to rotate, entering a false start power consumption mode, resulting in no power generation but only power consumption. At the same time, a large amount of oil is sprayed into the cylinder and burned in the exhaust pipe, producing aftercombustion.

[0077] When the engine is falsely started, the fuel is not ignited successfully, and the unignited fuel will be discharged to the exhaust gas treatment device for exhaust gas treatment. When a large amount of unburned fuel enters the exhaust gas treatment device, aftercombustion occurs, which damages the catalytic device.

[0078] The present application introduces an air-fuel ratio method after the engine reaches a preset speed. In this way, in the case of a false start when the speed judges that the engine has started but the actual engine has not started, the engine ignition condition is further judged by the relationship between the air-fuel ratio and the preset air-fuel ratio threshold, thereby improving the accuracy of engine start judgment, reducing the probability of false engine start, and reducing battery power loss and fuel afterburning problems.

[0079] The speed threshold may be the industry-wide value of 1300 rpm. The air-fuel ratio threshold may be 1.1, and the first preset time may be 5 to 10 seconds. Since there is a time delay from engine ignition to exhaust gas discharge from the engine, obtaining the air-fuel ratio after the first preset time can reflect the actual ignition condition of the engine.

[0080] Combined with the first aspect, Figure 2 As shown, in the second embodiment provided by the present application, after obtaining the engine speed, the method further includes:

[0081] S60: If the engine speed is less than or equal to the first speed threshold, the control restarts the engine and determines whether the engine is started successfully.

[0082] When the engine speed is not greater than the first speed threshold, it means that the engine has not been started successfully, and an instruction to start the engine can be issued again to determine whether the engine has been started successfully.

[0083] Combined with the first aspect, Figure 3 As shown, in the third embodiment provided by the present application, if the engine speed is less than or equal to the first speed threshold, the control restarts the engine, and after determining whether the engine is successfully started, it also includes:

[0084] S70, obtaining the number of engine starts;

[0085] S80, determining whether the number of engine starts is equal to a first threshold;

[0086] S90: If it is equal to the first threshold, stop starting the engine.

[0087] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the introduction of the judgment of the number of restarts can make it possible to stop starting the engine to protect the battery if the engine still fails to start successfully after restarting the first threshold number of times. The first threshold can be 3 to 5 times.

[0088] Combined with the first aspect, Figure 4 As shown, in the fourth embodiment provided by the present application, after determining whether the engine speed is greater than the speed threshold, the process further includes:

[0089] S100, if the engine speed is less than or equal to the speed threshold, obtaining the temperature of the engine cooling water;

[0090] S110, determining whether the temperature of the engine cooling water is less than a temperature threshold;

[0091] S120: If the temperature of the engine cooling water is lower than the temperature threshold, the control restarts the engine and determines whether the engine is started successfully.

[0092] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the engine cooling water temperature is introduced to judge. When the temperature of the engine cooling water is lower than the temperature threshold, the engine can be started again. That is, the engine combustion time is shorter at low water temperature, and the heat transferred to the catalyst end is less, which causes less damage to the catalyst. The temperature threshold can be 50-70°C, preferably 60°C.

[0093] Combined with the first aspect, Figure 5 As shown, in the fifth embodiment provided by the present application, if the temperature of the engine cooling water is less than the temperature threshold, the control restarts the engine, and after determining whether the engine is successfully started, it also includes:

[0094] S130, obtaining the number of times the engine is started;

[0095] S140, determining whether the number of engine starts is equal to a second threshold;

[0096] S150: If it is equal to the second threshold, then stop starting the engine.

[0097] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the engine cooling water temperature is introduced to judge. When the temperature of the engine cooling water is less than the temperature threshold, the engine can be started again. That is, the engine combustion time is less at low water temperature, and the heat transferred to the catalyst end is less, which causes less damage to the catalyst. At this time, multiple starts are allowed, but in order to balance the power consumption of the battery, the number of starts is controlled at the second threshold. When the number of starts is less than the second threshold, it is allowed to continue to start. After it is equal to the second threshold, it is not allowed to continue to start and the engine needs to be shut down. The second threshold can be 3 to 5 times.

[0098] Combined with the first aspect, Figure 6 As shown, in the sixth embodiment provided by the present application, after determining whether the temperature of the engine cooling water is less than the temperature threshold, it also includes:

[0099] S160, if the temperature of the engine cooling water is greater than or equal to the temperature threshold, control to restart the engine and determine whether the engine is started successfully;

[0100] S170, obtaining the number of engine starts;

[0101] S180, determining whether the number of engine starts is equal to a third threshold;

[0102] S190: If it is equal to the third threshold, stop starting the engine.

[0103] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the engine cooling water temperature judgment is introduced. When the temperature of the engine cooling water is greater than the temperature threshold, that is, the engine combustion time is long at high water temperature, the heat transferred to the catalyst end is more, and the damage to the catalyst is greater. The number of times the engine is started can be set to a third threshold. When the number of starts is less than the third threshold, it is allowed to continue to start. When it is equal to the third threshold, it is not allowed to continue to start, and the engine needs to be shut down to protect the catalyst. The second threshold can be 1 to 2 times.

[0104] Combined with the first aspect, Figure 7 As shown, in the seventh embodiment provided by the present application, after determining whether the air-fuel ratio of the engine is less than the air-fuel ratio threshold, it also includes:

[0105] S200: If the air-fuel ratio of the engine is greater than or equal to the air-fuel ratio threshold, the control restarts the engine and determines whether the engine is started successfully.

[0106] When any of the engine speed and air-fuel ratio does not meet the threshold, it means that the engine has not started successfully and needs to be restarted.

[0107] Combined with the first aspect, Figure 8 As shown, in the eighth embodiment provided by the present application, if the air-fuel ratio of the engine is greater than or equal to the air-fuel ratio threshold, the control restarts the engine, and after determining whether the engine is successfully started, it also includes:

[0108] S210, obtaining the number of engine starts;

[0109] S220, determining whether the number of engine starts is equal to a fourth threshold;

[0110] S230: If the number of times the engine is started is equal to a fourth threshold, stop starting the engine.

[0111] When the engine fails to start, the generator will start the engine multiple times. If the number of repeated starts is too many, the battery will be exhausted or the power will be lost. Therefore, the introduction of the judgment of the number of restarts can make the engine stop starting if the engine still fails to start successfully after restarting the fourth threshold number of times to protect the battery. The fourth threshold can be 3 to 5 times.

[0112] Combined with the first aspect, Fig. 9 As shown, in the ninth embodiment provided in the present application, the vehicle engine start judgment method is applied to an extended-range vehicle, and before obtaining the engine speed, it includes:

[0113] S01. Issue an engine start command to control the range extender to start rotating under the drive of the battery and drive the engine to ignite.

[0114] By introducing the air-fuel ratio after the engine reaches the preset speed, in the case of a false start when the speed judges that the engine has started but the actual engine has not started, the engine ignition condition can be further judged by the relationship between the air-fuel ratio and the preset air-fuel ratio threshold, thereby improving the accuracy of engine start judgment, reducing the probability of false engine start, and reducing battery power loss and fuel afterburning problems.

[0115] Second, as Fig.10 As shown, the present application provides a vehicle engine start judgment device, comprising:

[0116] A first acquisition module, used to acquire the rotation speed of the engine;

[0117] A first judgment module, used to judge whether the engine speed is greater than a speed threshold;

[0118] A second acquisition module, configured to acquire the air-fuel ratio of the engine after a first preset time if the engine speed is greater than a speed threshold;

[0119] A second judgment module, used to judge whether the air-fuel ratio of the engine is less than an air-fuel ratio threshold;

[0120] The execution module is used to determine that the engine is started successfully if the air-fuel ratio is less than a threshold value.

[0121] The vehicle engine start judgment device can implement the vehicle engine start judgment method of the first aspect, by introducing the air-fuel ratio after the engine reaches a preset speed, so that in the case of a false start when the speed judges that the engine has started but the actual engine has not started, the engine ignition condition is further judged by the relationship between the air-fuel ratio and the preset air-fuel ratio threshold, thereby improving the accuracy of the engine start judgment, reducing the probability of false engine start, and reducing the battery power loss and fuel afterburning problems.

[0122] In summary, by introducing the air-fuel ratio after the engine reaches the preset speed, in the case of a false start when the speed judges that the engine has started but the actual engine has not started, the engine ignition condition can be further judged by the relationship between the air-fuel ratio and the preset air-fuel ratio threshold, thereby improving the accuracy of engine start judgment, reducing the probability of false engine start, and reducing battery power loss and fuel afterburning problems.

[0123] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, device, product or equipment that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or equipment. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to be different types.

[0124] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0125] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0126] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0127] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0128] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A vehicle engine start judgment method, characterized in that: The following steps are involved: Get the engine speed; Determine whether the engine speed is greater than a speed threshold; If the engine speed is greater than the speed threshold, obtaining the engine air-fuel ratio after a first preset time; Determining whether the air-fuel ratio of the engine is less than an air-fuel ratio threshold; If it is less than the air-fuel ratio threshold, the engine is judged to be started successfully.

2. The vehicle engine start determination method according to claim 1, characterized in that: After obtaining the engine speed, the method further includes: If the engine speed is less than or equal to the first speed threshold, the control restarts the engine and determines whether the engine is started successfully.

3. The vehicle engine start determination method according to claim 2, characterized in that: If the engine speed is less than or equal to the first speed threshold, the control method restarts the engine, and determines whether the engine is successfully started, and further includes: Get the number of times the engine has been started; Determining whether the number of engine starts is equal to a first threshold; If it is equal to the first threshold, the engine is stopped.

4. The vehicle engine start determination method according to claim 1, characterized in that: After determining whether the engine speed is greater than the speed threshold, the method further includes: If the engine speed is less than or equal to the speed threshold, the temperature of the engine cooling water is obtained; Determine whether the temperature of the engine cooling water is less than a temperature threshold; If the temperature of the engine cooling water is less than the temperature threshold, the control restarts the engine and determines whether the engine is started successfully.

5. The vehicle engine start determination method according to claim 4, characterized in that: If the temperature of the engine cooling water is lower than the temperature threshold, the control restarts the engine, and after determining whether the engine is successfully started, the method further includes: Get the number of times the engine has been started; determining whether the number of engine starts is equal to a second threshold; If it is equal to the second threshold, the engine is stopped.

6. The vehicle engine start determination method according to claim 4, characterized in that: After determining whether the temperature of the engine cooling water is less than the temperature threshold, the method further includes: If the temperature of the engine cooling water is greater than or equal to the temperature threshold, the control restarts the engine and determines whether the engine is started successfully; Get the number of times the engine has been started; determining whether the number of engine starts is equal to a third threshold; If it is equal to the third threshold, the engine is stopped.

7. The vehicle engine start determination method according to claim 1, characterized in that: After determining whether the air-fuel ratio of the engine is less than the air-fuel ratio threshold, the method further includes: If the air-fuel ratio of the engine is greater than or equal to the air-fuel ratio threshold, the control restarts the engine and determines whether the engine is started successfully.

8. The vehicle engine start determination method according to claim 7, characterized in that: If the air-fuel ratio of the engine is greater than or equal to the air-fuel ratio threshold, the control restarts the engine, and after determining whether the engine is successfully started, the method further includes: Get the number of times the engine has been started; determining whether the number of engine starts is equal to a fourth threshold; If the number of engine starts is equal to a fourth threshold, the engine is stopped.

9. The vehicle engine start determination method according to any one of claims 1 to 8, characterized in that: The method is applied to an extended-range vehicle, and before obtaining the engine speed, it includes: The engine start command is issued to control the range extender to start rotating under the drive of the battery and drive the engine to ignite.

10. A vehicle engine start judgment device, characterized in that: include: A first acquisition module, used to acquire the rotation speed of the engine; A first judgment module, used to judge whether the engine speed is greater than a speed threshold; A second acquisition module, configured to acquire the air-fuel ratio of the engine after a first preset time if the engine speed is greater than a speed threshold; A second judgment module, used to judge whether the air-fuel ratio of the engine is less than an air-fuel ratio threshold; The execution module is used to determine that the engine is started successfully if the air-fuel ratio is less than a threshold value.

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