A control method and device after engine start failure

Abstract

The application discloses an engine start failure control method and device. The cause of engine start failure is determined according to the engine speed and the engine failure level, so that a corresponding control strategy can be taken according to the cause of engine start failure in the future. The inappropriate control is avoided to cause damage to the vehicle transmission system of the hybrid vehicle, and the engine start success and the probability of normal driving of the vehicle are improved through appropriate control, so that the user satisfaction is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a control method and device for engine start-up failure. Background Technology

[0002] With the gradual development of hybrid vehicle technology, the ability to start the engine normally in hybrid vehicles is crucial. In hybrid vehicles, the engine can start under various operating conditions. For example, when the hybrid vehicle is parked, the engine can start according to the user's needs; when the hybrid vehicle is driving, the engine can start according to the user's needs.

[0003] In hybrid electric vehicles, engine starting requires the coordinated efforts of multiple components, including the engine, battery, and drive motor. Furthermore, if any one or more of these components malfunctions during the engine starting process, the engine will fail to start.

[0004] However, in existing technologies, because the specific cause of engine start-up failure cannot be determined, the control unit adopts a conservative control strategy when engine start-up fails to avoid damage to the hybrid vehicle's powertrain. This conservative strategy involves not attempting to start the engine again after a failed start-up attempt within the current power-on cycle, allowing the hybrid vehicle to run on pure electric power until it stops due to insufficient high-voltage battery charge. This conservative control strategy results in a low probability of successful engine start-up and normal vehicle operation, leading to a poor user experience and low satisfaction. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems in the prior art, this application provides a control method and device after engine start failure, which can adopt a corresponding control strategy according to the specific reason for engine start failure, thereby increasing the probability of successful engine start and normal vehicle operation, and thus improving user satisfaction.

[0006] To achieve the above objectives, the technical solution provided in this application is as follows:

[0007] This application provides a control method for engine start-up failure, including:

[0008] If the engine speed does not exceed the first threshold, the cause of the engine start failure is determined to be engine mechanical jamming, and the current engine start process is terminated.

[0009] If the engine speed exceeds a first threshold but is lower than a second threshold, the engine start failure is determined to be due to a malfunction in at least one engine component. Based on the fault level reported by the engine, it is determined whether the engine is in a serious fault state. The first threshold is less than the second threshold.

[0010] If the engine is in a serious fault condition, the current engine start-up process will be terminated.

[0011] If the engine is not in a serious fault condition, the current engine start-up process will end, and the engine will be restarted again after a preset time period.

[0012] Optionally, the engine may be started for a vehicle in a parked state, and / or the engine may be started for a vehicle in a driving state.

[0013] Optionally, when starting the engine of a vehicle that is in a parked state, the following may also be included:

[0014] To obtain battery discharge power and / or motor drive torque;

[0015] If the battery discharge power is lower than the third threshold, the reason for the engine start failure is determined to be limited battery capacity. The current engine start process is then terminated, and the engine is restarted again after a preset time period.

[0016] And / or,

[0017] If the motor drive torque is lower than the fourth threshold, the reason for the engine start failure is determined to be the limited capability of the drive motor. The current engine start process is then terminated, and the engine is restarted again after a preset time period.

[0018] Optionally, the failure of at least one engine component specifically includes: reduced performance of the engine fuel injection system and / or reduced performance of the ignition system;

[0019] The specific serious fault conditions are: failure of the engine fuel injection system and / or failure of the ignition system.

[0020] Optionally, the engine mechanical jamming specifically refers to: engine crankshaft jamming, and / or engine piston jamming.

[0021] This application also provides a control device for engine start failure, including:

[0022] The first determining unit is used to determine that the engine start failure is due to engine mechanical jamming if the engine speed does not exceed a first threshold, and then terminate the current engine start process.

[0023] The second determining unit is configured to determine that the engine starting failure is due to a malfunction of at least one engine component if the engine speed exceeds a first threshold and is lower than a second threshold, and to determine whether the engine is in a serious fault state based on the fault level fed back by the engine; wherein the first threshold is less than the second threshold.

[0024] The third determining unit is used to terminate the current engine start-up process if the engine is in a serious fault state.

[0025] The fourth determining unit is used to terminate the current engine start-up process and restart the engine after a preset time period if the engine is not in a serious fault state.

[0026] Optionally, the engine may be started for a vehicle in a parked state, and / or the engine may be started for a vehicle in a driving state.

[0027] Optional, also includes:

[0028] The acquisition unit is used to acquire the battery discharge power and / or motor drive torque when the engine is started in a parked vehicle.

[0029] The fifth determining unit is used to determine that the reason for the engine start failure is limited battery capacity if the battery discharge power is lower than the third threshold, then terminate the current engine start process and restart the engine after a preset time period.

[0030] And / or,

[0031] The sixth determining unit is used to determine that the reason for the engine start failure is that the drive motor capability is limited if the motor drive torque is lower than the fourth threshold, then terminate the current engine start process and restart the engine after a preset time period.

[0032] Optionally, the failure of at least one engine component specifically includes: reduced performance of the engine fuel injection system and / or reduced performance of the ignition system;

[0033] The specific serious fault conditions are: failure of the engine fuel injection system and / or failure of the ignition system.

[0034] Optionally, the engine mechanical jamming specifically refers to: engine crankshaft jamming, and / or engine piston jamming.

[0035] Compared with the prior art, this application has at least the following advantages:

[0036] The control method provided in this application for engine start failure determines the cause of engine start failure based on the engine speed and the engine fault level, so that corresponding control strategies can be taken according to the cause of engine start failure, thereby increasing the probability of successful engine start and normal vehicle operation, and thus improving user satisfaction.

[0037] If the engine speed does not exceed the first threshold, the cause of the engine starting failure is determined to be engine mechanical jamming. Since restarting the engine at this time is likely to damage the vehicle's transmission system, when the engine fails to start due to engine mechanical jamming, it is only necessary to end the current engine starting process and not to restart the engine to avoid damage to the vehicle's transmission system.

[0038] If the engine speed exceeds the first threshold but does not exceed the second threshold, the engine start failure is determined to be due to a malfunction in at least one engine component. If the engine is not in a serious fault state, it can be determined that restarting the engine will not damage the vehicle's transmission system. Therefore, when the engine start failure is due to a malfunction in at least one engine component and the engine is not in a serious fault state, the current engine start process can be terminated, and the engine can be restarted again after a preset time period to increase the probability of successful engine start and normal vehicle operation. However, if the engine is in a serious fault state, it can be determined that restarting the engine will damage the vehicle's transmission system. Therefore, when the engine start failure is due to a malfunction in at least one engine component and the engine is in a serious fault state, it is only necessary to terminate the current engine start process and not to restart the engine.

[0039] This not only avoids damage to the vehicle's transmission system caused by improper control, but also increases the probability of successful engine start-up and normal vehicle operation, thereby improving user satisfaction. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 A flowchart of the control method after engine start failure provided in Embodiment 1 of this application;

[0042] Figure 2A flowchart of the control method after engine start failure provided in Embodiment 2 of this application;

[0043] Figure 3 This is a schematic diagram of the control device provided in Embodiment 1 of this application after an engine start-up failure. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Method Example 1

[0046] See Figure 1 The figure is a flowchart of the control method after engine start failure provided in Embodiment 1 of this application.

[0047] The control method for engine start failure provided in this application includes:

[0048] S101: Obtain the engine speed.

[0049] Engine speed can be used to determine whether the engine has started successfully. Specifically: if the engine speed has not reached the speed required for successful start after a certain period of time since receiving the start command, the engine start can be determined to have failed; if the engine speed has reached the speed required for successful start after a certain period of time since receiving the start command, the engine start can be determined to have succeeded.

[0050] In addition, the vehicle's engine can be started under various operating conditions. For example, when the vehicle is parked, the engine can be started according to the user's needs; when the vehicle is in motion, the engine can be started according to the user's needs.

[0051] As one implementation method, S101 can specifically be: when starting the engine of a vehicle in a parked state, the engine speed is obtained.

[0052] As another implementation method, S101 can specifically be: when starting the engine of a vehicle that is in motion, the engine speed is obtained.

[0053] S102: Determine whether the engine speed exceeds the first threshold. If yes, execute S104; otherwise, execute S103.

[0054] The first threshold can be preset or determined according to the actual application scenario.

[0055] As an example, the first threshold can be determined based on the engine speed when the crankshaft or piston is stuck. Since the engine can hardly rotate when the crankshaft or piston is stuck, the engine speed is close to 0. Therefore, the first threshold can be preset to 0 or preset to a positive number that is very close to 0.

[0056] As one implementation method, if the first threshold is preset to 0, then S102 can specifically be: determine whether the engine speed is greater than 0. If yes, it means that the crankshaft and piston in the engine are not stuck, and S104 can be executed at this time; if no, it means that the crankshaft and / or piston in the engine are stuck. At this time, it can be determined that the engine failure is caused by engine mechanical jamming, and therefore S103 can be executed.

[0057] S103: Determine that the engine failed to start, and determine that the reason for the engine failure is mechanical jamming of the engine, and execute S108.

[0058] S104: Determine whether the engine speed is lower than the second threshold. If yes, execute S106; otherwise, execute S105.

[0059] The second threshold can be preset or determined according to the actual application scenario.

[0060] As an example, the second threshold can be determined based on the speed required for the engine to start successfully. In this case, in S104, if the engine speed is not lower than the second threshold, it means that the engine speed has reached the speed required for the engine to start successfully, and the engine can be determined to have started successfully; if the engine speed is lower than the second threshold, it means that the engine speed has not reached the speed required for the engine to start successfully, and the engine can be determined to have started unsuccessfully.

[0061] S105: Engine start confirmed.

[0062] S106: It is determined that the engine failed to start, and the cause of the engine failure is determined to be a malfunction of at least one engine component.

[0063] Engine components can be any component that affects engine starting.

[0064] As an example, engine components may include at least one of components corresponding to the engine fuel injection system and components corresponding to the ignition system. In this case, as one implementation, S106 may specifically involve: determining that the engine has failed to start, and determining that the cause of the engine start failure is a decrease in the performance of the engine fuel injection system and / or a decrease in the performance of the ignition system.

[0065] Furthermore, when different types of engine parts malfunction and when different numbers of engine parts malfunction, the engine may be in different fault levels. Moreover, restarting an engine in different fault levels will have different effects on the vehicle's transmission system.

[0066] As an example, different fault levels can be divided into severe fault states and non-severe fault states according to preset criteria. For example, a severe fault state can specifically be: engine fuel injection system failure and / or ignition system failure.

[0067] The preset standards can be set in advance or determined according to the actual application scenario.

[0068] If the engine is in a non-serious fault state, restarting the engine will not cause any damage to the vehicle's transmission system. On the contrary, it will increase the probability of successful engine starting and normal vehicle operation, thereby improving user satisfaction. In this case, after ending the current engine starting process, you can try to start the engine again. If the engine is in a serious fault state, restarting the engine will damage the vehicle's transmission system. In this case, to avoid damage to the vehicle's transmission system, you should end the current engine starting process and not attempt to start the engine again.

[0069] S107: Based on the fault level reported by the engine, determine whether the engine is in a serious fault state. If yes, proceed to S108; otherwise, proceed to S109.

[0070] S108: End the current engine start-up process.

[0071] S109: End the current engine start-up process and restart the engine after a preset time period.

[0072] The preset time can be set in advance or determined according to the actual application scenario.

[0073] Engine mechanical jamming can be caused by a malfunction in any of the engine or transmission components, resulting in the engine being unable to be driven and thus running at a low speed.

[0074] As an example, the engine mechanical jamming specifically refers to: engine crankshaft jamming, and / or engine piston jamming.

[0075] In addition, if the engine fails to start due to mechanical jamming, restarting the engine will damage the vehicle's transmission system. In this case, to avoid damage to the vehicle's transmission system, the current engine starting process should be ended and no further attempts to start the engine should be made.

[0076] The above is a specific implementation of the control method after engine start failure provided in Embodiment 1 of this application. In this implementation, the cause of engine start failure is determined based on the engine speed and the engine fault level, so that a corresponding control strategy can be taken according to the cause of engine start failure, thereby increasing the probability of successful engine start and normal vehicle operation, and thus improving user satisfaction.

[0077] If the engine speed does not exceed the first threshold, the cause of the engine starting failure is determined to be engine mechanical jamming. Since restarting the engine at this time is likely to damage the vehicle's transmission system, when the engine fails to start due to engine mechanical jamming, it is only necessary to end the current engine starting process and not to restart the engine to avoid damage to the vehicle's transmission system.

[0078] If the engine speed exceeds the first threshold but does not exceed the second threshold, the engine start failure is determined to be due to a malfunction in at least one engine component. If the engine is not in a serious fault state, it can be determined that restarting the engine will not damage the vehicle's transmission system. Therefore, when the engine start failure is due to a malfunction in at least one engine component and the engine is not in a serious fault state, the current engine start process can be terminated, and the engine can be restarted again after a preset time period to increase the probability of successful engine start and normal vehicle operation. However, if the engine is in a serious fault state, it can be determined that restarting the engine will damage the vehicle's transmission system. Therefore, when the engine start failure is due to a malfunction in at least one engine component and the engine is in a serious fault state, it is only necessary to terminate the current engine start process and not to restart the engine.

[0079] This not only avoids damage to the vehicle's transmission system caused by improper control, but also increases the probability of successful engine start-up and normal vehicle operation, thereby improving user satisfaction.

[0080] The control method provided above for engine start failure determines the specific cause of the engine start failure based on the engine speed and the fault level reported by the engine. This allows for the implementation of corresponding control strategies based on the cause of the engine start failure, thereby increasing the probability of successful engine start and normal vehicle operation, and ultimately improving user satisfaction.

[0081] Furthermore, since the vehicle's engine can be started under various operating conditions—for example, when the vehicle is parked, the engine can be started according to user needs; when the vehicle is in motion, the engine can be started according to user needs; and regardless of the operating condition under which the vehicle's engine is started, the specific reason for the engine start failure can be determined based on the engine speed and the fault level reported by the engine. Therefore, the control method for engine start failure provided in the above-described embodiment one can be used in either the application scenario of starting the engine of a parked vehicle or a vehicle in motion.

[0082] Furthermore, during the engine start-up process of a vehicle in a parked state, the cause of engine start-up failure can be determined not only by the engine speed but also by the battery discharge power and / or motor drive torque. This allows for the implementation of corresponding control strategies based on the cause of engine start-up failure. Therefore, to further improve the probability of successful engine start-up and normal vehicle operation, thereby increasing user satisfaction, this application also provides another implementation of the control method after engine start-up failure, which will be explained and described in detail below with reference to the accompanying drawings.

[0083] Method Example 2

[0084] Method embodiment two is an improvement on method embodiment one. For the sake of brevity, the parts of method embodiment two that are the same as those in method embodiment one will not be described again here.

[0085] See Figure 2 The figure is a flowchart of the control method after engine start failure provided in Embodiment 2 of this application.

[0086] The control method for engine start failure provided in this application embodiment can be applied to application scenarios of starting the engine of a vehicle in a parked state. The method includes:

[0087] S201: Obtain battery discharge power.

[0088] Battery discharge power can be used to determine whether the battery capacity is limited. Specifically: if the battery discharge power is lower than the third threshold, it can be determined that the battery capacity is limited. In this case, the engine starting process will fail due to the limited battery capacity. If the battery discharge power is not lower than the third threshold, it can be determined that the battery capacity is not limited. In this case, the battery can work normally and will not cause the engine to fail to start.

[0089] S202: Determine whether the battery discharge power is lower than the third threshold. If yes, proceed to S203; otherwise, proceed to S207.

[0090] The third threshold can be preset or determined according to the actual application scenario.

[0091] S203: Determine that the engine failed to start, and determine that the reason for the failure is limited battery capacity, and then execute S215.

[0092] There are many factors that can cause battery capacity to be limited. For example, low ambient temperature will limit battery capacity, while when the ambient temperature rises to a preset temperature value, the battery capacity will not be limited and the battery will be in normal condition.

[0093] When battery capacity is limited, it can recover to normal over time and is no longer in a limited state. Therefore, when engine starting fails due to limited battery capacity, restarting the engine will not cause any damage to the vehicle's transmission system. On the contrary, it will increase the probability of successful engine starting and normal vehicle operation, thereby improving user satisfaction. Therefore, when the reason for engine starting failure is limited battery capacity, you can try to start the engine again after the current engine starting process has ended.

[0094] S204: Obtain motor drive torque.

[0095] The motor drive torque can be used to indicate whether the drive motor's capability is limited. Specifically: if the motor drive torque is lower than the fourth threshold, it can be determined that the drive motor's capability is limited. In this case, the engine starting process will fail due to the limited drive motor capability. If the motor drive torque is not lower than the fourth threshold, it can be determined that the drive motor's capability is not limited. In this case, the drive motor can work normally and will not cause the engine to fail to start.

[0096] S205: Determine whether the motor drive torque is lower than the fourth threshold. If yes, execute S206; otherwise, execute S207.

[0097] The fourth threshold can be preset or determined according to the actual application scenario.

[0098] S206: Determine that the engine failed to start, and determine that the reason for the failure is that the drive motor has limited capability, and then execute S215.

[0099] The reasons for the limited capability of the drive motor can include a variety of factors. For example, low ambient temperature will limit the capability of the drive motor, while when the ambient temperature rises to the preset temperature value, the capability of the drive motor will not be limited, and the drive motor will be in normal condition.

[0100] When the drive motor's capability is limited, it can recover to normal over time and is no longer in a limited state. Therefore, when the engine fails to start due to the limited drive motor capability, restarting the engine will not cause any damage to the vehicle's transmission system. On the contrary, it will increase the probability of successful engine start and normal vehicle operation, thereby improving user satisfaction. Therefore, when the engine fails to start due to the limited drive motor capability, the engine can be restarted after the current engine start process has ended.

[0101] S207: Obtain the engine speed.

[0102] The specific implementation of S207 is the same as that of S101, and will not be described again here for the sake of brevity.

[0103] S208: Determine whether the engine speed exceeds the first threshold. If yes, execute S210; otherwise, execute S209.

[0104] The specific implementation of S208 is the same as that of S102, and will not be described again here for the sake of brevity.

[0105] S209: Determine that the engine failed to start, and determine that the cause of the engine failure is mechanical jamming of the engine, and execute S214.

[0106] The specific implementation of S209 is the same as that of S103, and will not be described again here for the sake of brevity.

[0107] S210: Determine whether the engine speed is lower than the second threshold. If yes, execute S212; otherwise, execute S211.

[0108] The specific implementation of S210 is the same as that of S104, and will not be described again here for the sake of brevity.

[0109] S211: Engine start confirmed.

[0110] The specific implementation of S211 is the same as that of S105, and will not be described again here for the sake of brevity.

[0111] S212: It is determined that the engine failed to start, and the cause of the engine failure is determined to be a malfunction of at least one engine component.

[0112] The specific implementation of S212 is the same as that of S106, and will not be described again here for the sake of brevity.

[0113] S213: Based on the fault level reported by the engine, determine whether the engine is in a serious fault state. If yes, proceed to S214; otherwise, proceed to S215.

[0114] The specific implementation of S213 is the same as that of S107, and will not be repeated here for the sake of brevity.

[0115] S214: End the current engine start-up process.

[0116] The specific implementation of S214 is the same as that of S108, and will not be described again here for the sake of brevity.

[0117] S215: End the current engine start-up process and restart the engine after a preset time period.

[0118] The specific implementation of S215 is the same as that of S109, and will not be described again here for the sake of brevity.

[0119] It should be noted that in the second embodiment of the method of this application, S201, S202, S203, S207 and S215 can be used to describe the process of determining the battery state and selecting the control operation based on the battery discharge power, while S204, S205, S206, S207 and S215 can be used to describe the process of determining the motor drive state and selecting the control operation based on the motor drive torque. Furthermore, in the specific implementation of the control method after engine start failure provided in Embodiment 2 of this application, the process of determining the battery state and selecting a control operation based on the battery discharge power and the process of determining the motor drive state and selecting a control operation based on the motor drive torque can be executed only once, or both processes can be executed. Moreover, when both processes are executed, there is no fixed execution order between them. The process of determining the battery state and selecting a control operation based on the battery discharge power can be executed first, followed by the process of determining the motor drive state and selecting a control operation based on the motor drive torque; alternatively, the process of determining the motor drive state and selecting a control operation based on the motor drive torque can be executed first, followed by the process of determining the battery state and selecting a control operation based on the battery discharge power. Additionally, in the specific implementation of the control method after engine start failure provided in Embodiment 2 of this application, the process of determining the battery state and selecting a control operation based on the battery discharge power or the process of determining the motor drive state and selecting a control operation based on the motor drive torque can be executed before S207 or after S215. This application does not specifically limit this.

[0120] The above is a specific implementation of the control method after engine start failure provided in Embodiment 2 of this application. In this embodiment, not only is the specific cause of engine start failure determined based on the engine speed and the fault level fed back by the engine, but also the specific cause of engine start failure is determined based on the battery discharge power and / or the motor drive torque to determine whether the specific cause of engine start failure is limited battery capacity and / or limited drive motor capacity. Moreover, when it is determined that the specific cause of engine start failure is limited battery capacity and / or limited drive motor capacity, the current engine start process can be terminated, and the engine can be restarted again after a preset time period to increase the probability of successful engine start and normal vehicle operation, thereby further improving the probability of successful engine start and normal vehicle operation, and thus improving user satisfaction.

[0121] The above-described method embodiments one and two provide specific implementation methods for the control method after engine start failure. In this embodiment, the specific cause of engine start failure can be determined based on at least one of the engine speed, engine fault level, battery discharge power, and motor drive torque, so that a corresponding control strategy can be adopted according to the cause of engine start failure, thereby increasing the probability of successful engine start and normal vehicle operation, and thus improving user satisfaction.

[0122] In addition, based on the control method for engine start failure provided above, this application embodiment also provides a control device for engine start failure, which will be explained and described below in conjunction with the accompanying drawings.

[0123] Device Example 1

[0124] See Figure 3 The figure is a schematic diagram of the control device after engine start failure provided in Embodiment 1 of this application.

[0125] The control device for engine start failure provided in this application embodiment includes:

[0126] The first determining unit 301 is used to determine that the engine starting failure is due to engine mechanical jamming if the engine speed does not exceed a first threshold, and then terminate the current engine starting process.

[0127] The second determining unit 302 is used to determine that the engine starting failure is due to a malfunction of at least one engine component if the engine speed exceeds a first threshold and is lower than a second threshold, and to determine whether the engine is in a serious fault state based on the fault level fed back by the engine; the first threshold is less than the second threshold.

[0128] The third determining unit 303 is used to terminate the current engine start-up process if the engine is in a serious fault state.

[0129] The fourth determining unit 304 is used to terminate the current engine start-up process and restart the engine after a preset time period if the engine is not in a serious fault state.

[0130] As one implementation method, in order to further improve the probability of successful engine start and normal vehicle operation, thereby improving user satisfaction, the engine is started for vehicles in a parked state, and / or for vehicles in a driving state.

[0131] As one implementation method, to further improve the probability of successful engine start-up and normal vehicle operation, thereby increasing user satisfaction, the device further includes:

[0132] The acquisition unit is used to acquire the battery discharge power and / or motor drive torque when the engine is started in a parked vehicle.

[0133] The fifth determining unit is used to determine that the reason for the engine start failure is limited battery capacity if the battery discharge power is lower than the third threshold, then terminate the current engine start process and restart the engine after a preset time period.

[0134] And / or,

[0135] The sixth determining unit is used to determine that the reason for the engine start failure is that the drive motor capability is limited if the motor drive torque is lower than the fourth threshold, then terminate the current engine start process and restart the engine after a preset time period.

[0136] As one implementation method, in order to further improve the probability of successful engine start-up and normal vehicle operation, thereby improving user satisfaction, the failure of at least one engine component specifically includes: reduced performance of the engine fuel injection system and / or reduced performance of the ignition system.

[0137] The specific serious fault conditions are: failure of the engine fuel injection system and / or failure of the ignition system.

[0138] As one implementation method, in order to further improve the probability of successful engine start-up and normal vehicle operation, thereby improving user satisfaction, the engine mechanical jamming specifically refers to: engine crankshaft jamming, and / or engine piston jamming.

[0139] The control device for engine start failure provided in this application includes: a first determining unit 301, a second determining unit 302, a third determining unit 303, and a fourth determining unit 304. In this device, the cause of engine start failure is determined based on the engine speed and the engine fault level, so that a corresponding control strategy can be taken based on the cause of the engine start failure, thereby increasing the probability of successful engine start and normal vehicle operation, and ultimately improving user satisfaction.

[0140] If the engine speed does not exceed the first threshold, the cause of the engine starting failure is determined to be engine mechanical jamming. Since restarting the engine at this time is likely to damage the vehicle's transmission system, when the engine fails to start due to engine mechanical jamming, it is only necessary to end the current engine starting process and not to restart the engine to avoid damage to the vehicle's transmission system.

[0141] If the engine speed exceeds the first threshold but does not exceed the second threshold, the engine start failure is determined to be due to a malfunction in at least one engine component. If the engine is not in a serious fault state, it can be determined that restarting the engine will not damage the vehicle's transmission system. Therefore, when the engine start failure is due to a malfunction in at least one engine component and the engine is not in a serious fault state, the current engine start process can be terminated, and the engine can be restarted again after a preset time period to increase the probability of successful engine start and normal vehicle operation. However, if the engine is in a serious fault state, it can be determined that restarting the engine will damage the vehicle's transmission system. Therefore, when the engine start failure is due to a malfunction in at least one engine component and the engine is in a serious fault state, it is only necessary to terminate the current engine start process and not to restart the engine.

[0142] This not only avoids damage to the vehicle's transmission system caused by improper control, but also increases the probability of successful engine start-up and normal vehicle operation, thereby improving user satisfaction.

[0143] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0144] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.

Claims

1. A control method for engine start-up failure, characterized in that, The method of starting the engine of a vehicle in a parked state, and / or starting the engine of a vehicle in a driving state, includes: If the engine speed does not exceed the first threshold, the cause of the engine start failure is determined to be engine mechanical jamming, and the current engine start process is terminated. If the engine speed exceeds a first threshold but is lower than a second threshold, the engine start failure is determined to be due to a malfunction in at least one engine component. Based on the fault level reported by the engine, it is determined whether the engine is in a serious fault state. The first threshold is less than the second threshold. If the engine is in a serious fault condition, the current engine start-up process will be terminated. If the engine is not in a serious fault condition, the current engine start-up process will be terminated, and the engine will be restarted again after a preset time period. When starting the engine of a vehicle that is in a parked state, the method further includes: Obtain battery discharge power and / or motor drive torque; If the battery discharge power is lower than the third threshold, the reason for the engine start failure is determined to be limited battery capacity. The current engine start process is then terminated, and the engine is restarted again after a preset time period. And / or, If the motor drive torque is lower than the fourth threshold, the reason for the engine start failure is determined to be the limited capability of the drive motor. The current engine start process is then terminated, and the engine is restarted again after a preset time period.

2. The method according to claim 1, characterized in that, The failure of at least one engine component specifically includes: reduced performance of the engine fuel injection system and / or reduced performance of the ignition system. The specific serious fault conditions are: failure of the engine fuel injection system and / or failure of the ignition system.

3. The method according to claim 1, characterized in that, The aforementioned engine mechanical jamming specifically refers to: engine crankshaft jamming, and / or engine piston jamming.

4. A control device for engine start failure, characterized in that, The device for starting the engine of a vehicle in a parked state, and / or for starting the engine of a vehicle in a driving state, includes: The first determining unit is used to determine that the engine start failure is due to engine mechanical jamming if the engine speed does not exceed a first threshold, and then terminate the current engine start process. The second determining unit is configured to determine that the engine starting failure is due to a malfunction of at least one engine component if the engine speed exceeds a first threshold and is lower than a second threshold, and to determine whether the engine is in a serious fault state based on the fault level fed back by the engine; wherein the first threshold is less than the second threshold. The third determining unit is used to terminate the current engine start-up process if the engine is in a serious fault state. The fourth determining unit is used to terminate the current engine start-up process and restart the engine after a preset time period if the engine is not in a serious fault state. The device further includes: The acquisition unit is used to acquire the battery discharge power and / or motor drive torque when the engine is started in a parked vehicle. The fifth determining unit is used to determine that the reason for the engine start failure is limited battery capacity if the battery discharge power is lower than the third threshold, then terminate the current engine start process and restart the engine after a preset time period. And / or, The sixth determining unit is used to determine that the reason for the engine start failure is that the drive motor capability is limited if the motor drive torque is lower than the fourth threshold, then terminate the current engine start process and restart the engine after a preset time period.

5. The apparatus according to claim 4, characterized in that, The failure of at least one engine component specifically includes: reduced performance of the engine fuel injection system and / or reduced performance of the ignition system. The specific serious fault conditions are: failure of the engine fuel injection system and / or failure of the ignition system.

6. The apparatus according to claim 4, characterized in that, The aforementioned engine mechanical jamming specifically refers to: engine crankshaft jamming, and / or engine piston jamming.

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