A method and apparatus for protecting a supercharger

Abstract

The application discloses a supercharger protection method and device. The supercharger is connected with an oil storage valve, and the oil storage valve is connected with a supercharger oil inlet pipe. When it is detected that the engine is powered on, the engine shutdown duration is acquired. The oil storage valve opening duration of the oil storage valve is determined according to the engine shutdown duration, and the oil storage valve is controlled to open according to the oil storage valve opening duration, so that the engine oil previously stored in the supercharger oil inlet pipe enters the supercharger through the oil storage valve, and the supercharger is lubricated.

Description

TECHNICAL FIELD

[0001] The present application relates to the engine technical field, more particularly, to a turbocharger protection method and device. BACKGROUND

[0002] At present, most diesel engines use turbochargers, which need to lubricate the intermediate shaft with oil to ensure reliable operation. However, after the engine stops, the oil in the intermediate shaft will flow back to the oil pan. During the next engine start process, the engine speed needs to be raised to drive the oil pump to pressurize the oil into the main oil passage, and then the oil is circulated to the intermediate shaft of the turbocharger through the lubricating oil passage to provide lubrication for the turbocharger.

[0003] However, the turbocharger will rotate as soon as the engine starts, so there is poor oil lubrication during the engine start-up period. If the oil inlet pipe of the turbocharger is not smooth, the oil lubrication will be worse, which may cause damage to the turbocharger.

[0004] Therefore, how to provide a turbocharger protection method to increase oil lubrication before the engine starts and avoid damage to the turbocharger is a problem that needs to be solved urgently. SUMMARY

[0005] Therefore, the present application provides a turbocharger protection method and device to increase oil lubrication before the engine starts and avoid damage to the turbocharger.

[0006] The first aspect of the present application provides a turbocharger protection method, the turbocharger is connected with an oil storage valve, the oil storage valve is connected with a turbocharger oil inlet pipe, and the method comprises:

[0007] When the engine is powered on, the engine downtime is obtained;

[0008] The oil storage valve opening time of the oil storage valve is determined according to the engine downtime;

[0009] The oil storage valve is controlled to open according to the oil storage valve opening time of the oil storage valve, so that the oil stored in the turbocharger oil inlet pipe passes through the oil storage valve and enters the turbocharger, thereby lubricating the turbocharger.

[0010] Optionally, the oil storage valve opening time of the oil storage valve is determined according to the engine downtime, comprising:

[0011] According to the engine downtime, the oil storage valve opening time of the oil storage valve is queried from each oil storage valve opening time of a pre-set first time table; wherein the first time table comprises a plurality of pre-set engine downtimes and their corresponding oil storage valve opening times.

[0012] Optionally, the booster inlet pipe is connected with the oil pump through the main oil passage, and the step of determining the opening time of the oil storage valve according to the shutdown time of the engine comprises:

[0013] querying the oil pump oil supply time of the oil pump from each oil pump oil supply time in a pre-set second time table according to the shutdown time of the engine; wherein the second time table comprises a plurality of pre-set engine shutdown times and corresponding oil pump oil supply times;

[0014] determining the oil pump oil supply time of the oil pump as the opening time of the oil storage valve.

[0015] Optionally, the method further comprises:

[0016] determining whether the shutdown time of the engine is greater than a preset shutdown time;

[0017] if the shutdown time of the engine is greater than the preset shutdown time, performing the step of determining the opening time of the oil storage valve according to the shutdown time of the engine.

[0018] Optionally, the method further comprises:

[0019] when detecting that the engine is started, determining whether the oil storage valve is in an open state;

[0020] if the oil storage valve is in the open state, controlling the oil storage valve to maintain the open state, so that the oil pump pressurizes corresponding oil into the main oil passage, and the oil enters the booster through the main oil passage, the booster inlet pipe and the oil storage valve;

[0021] if the oil storage valve is not in the open state, opening the oil storage valve, so that the oil pump pressurizes corresponding oil into the main oil passage, and the oil enters the booster through the main oil passage, the booster inlet pipe and the oil storage valve.

[0022] Optionally, the method further comprises:

[0023] when detecting that the engine is stopped, controlling the oil storage valve to be closed, so that the booster inlet pipe saves residual oil.

[0024] Optionally, the booster is further connected with a return oil pipe, and a pressure sensor is arranged on the return oil pipe, and the method further comprises:

[0025] monitoring the pressure value of the oil flowing in the return oil pipe through the pressure sensor, and determining whether the pressure value is less than a target pressure value;

[0026] If the pressure value is less than the target pressure value, a corresponding torque limiting operation is performed and corresponding pressure fault information is output.

[0027] The second aspect of the present application provides a protection device for a supercharger, the device comprising: a supercharger oil inlet pipe, an oil storage valve, a supercharger, an oil return pipe and an ECU;

[0028] One end of the oil storage valve is connected to one end of the supercharger oil inlet pipe, and the other end of the supercharger oil inlet pipe is connected to an oil pump through a main oil passage;

[0029] The other end of the oil storage valve is connected to one end of the supercharger, and the other end of the supercharger is connected to the oil return pipe;

[0030] The oil storage valve is controlled by the ECU, and the ECU is used to execute the protection method for the supercharger provided in the first aspect of the present application.

[0031] Optionally, the device further comprises a pressure sensor;

[0032] The pressure sensor is arranged on a straight pipe section of the oil return pipe, and the pressure sensor is controlled by the ECU.

[0033] Optionally, the device further comprises: a supercharger oil inlet pipe connector and a supercharger oil return pipe connector;

[0034] The other end of the oil storage valve is connected to one end of the supercharger through the supercharger oil inlet pipe connector;

[0035] The other end of the supercharger is connected to the oil return pipe through the supercharger oil return pipe connector.

[0036] The present application provides a protection method and device for a supercharger, the supercharger being connected to an oil storage valve, the oil storage valve being connected to a supercharger oil inlet pipe, and the supercharger oil inlet pipe being pre-stored with engine oil, so as to obtain the shutdown duration of the engine when the engine is powered on, determine the opening duration of the oil storage valve according to the shutdown duration of the engine, and finally control the opening duration of the oil storage valve according to the opening duration of the oil storage valve. As can be seen, the oil storage valve can be opened in advance to allow the pre-stored engine oil in the supercharger oil inlet pipe to pass through the oil storage valve and enter the supercharger before the engine is powered on but not started, so as to lubricate the supercharger in advance. When the engine is started, even if the supercharger oil inlet pipe is not flowing smoothly, the supercharger will not fail due to lack of lubrication, thereby achieving the purpose of protecting the supercharger. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute a part of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained based on the provided drawings without creative labor.

[0038] Figure 1 A structural schematic diagram of a protection device of a supercharger provided by an embodiment of the present application is shown in the figure.

[0039] Figure 2 A structural schematic diagram of another protection device of a supercharger provided by an embodiment of the present application is shown in the figure.

[0040] Figure 3 A structural schematic diagram of still another protection device of a supercharger provided by an embodiment of the present application is shown in the figure.

[0041] Figure 4 A flowchart of a protection method of a supercharger provided by an embodiment of the present application is shown in the figure.

[0042] Figure 5 A flowchart of another protection method of a supercharger provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] The term "comprising" and its variants are open-ended, that is, "including but not limited to". The term "based on" is "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Related definitions of other terms will be given in the following description.

[0045] It should be noted that the "first", "second", and the like concepts mentioned in the present application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0046] It should be noted that the modification of "one", "multiple" mentioned in the present application is illustrative but not restrictive, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0047] Referring to Figure 1 , a structure schematic diagram of a supercharger protection device provided by an embodiment of the present application is shown, which comprises a supercharger oil inlet pipe 1, an oil storage valve 2, a supercharger 3, an oil return pipe 4 and an electronic control unit (ECU) (not shown in the figure).

[0048] One end of the oil storage valve 2 is connected with one end of the supercharger oil inlet pipe 1, and the other end of the supercharger oil inlet pipe 1 is connected with an oil pump through a main oil passage; the other end of the oil storage valve 2 is connected with one end of the supercharger 3, and the other end of the supercharger 3 is connected with one end of the oil return pipe 4, and the other end of the oil return pipe is connected with an engine.

[0049] In the embodiment of the present application, an oil storage valve 2 can be connected on the downward end of the supercharger oil inlet pipe 1, that is, an oil storage valve 2 is installed on the downward position of the supercharger oil inlet pipe 1, which means that a supercharger oil inlet pipe 1 is connected above the oil storage valve 2, and a supercharger 3 is connected below the oil storage valve 2, so that the engine oil pre-stored in the supercharger oil inlet pipe 1 can enter the supercharger 3 through the oil storage valve 2 after the oil storage valve 2 is opened, thereby lubricating the supercharger.

[0050] It should be noted that a supercharger oil inlet pipe 1 is connected above the oil storage valve 2, and a supercharger 3 is connected below the oil storage valve 2, so that the engine oil pre-stored in the supercharger oil inlet pipe 1 can pass through the oil storage valve 2 under the action of gravity to the intermediate shaft of the supercharger 3 after the oil storage valve 2 is opened, thereby lubricating the intermediate shaft.

[0051] The oil storage valve 2 is controlled by the ECU, and the ECU is used to execute any one of the following embodiments of the supercharger protection method, and the process and principle of the supercharger protection method can be known by referring to the following embodiments, and the embodiments of the present application will not be described here.

[0052] It should be noted that the ECU controls the opening time and opening duration of the oil storage valve 2 by executing the corresponding supercharger protection method, so as to realize lubrication of the intermediate shaft of the supercharger 3 in advance before the engine starts, thereby avoiding the problem of damage to the supercharger 3 caused by the rotation of the supercharger 3 when the engine starts.

[0053] Further, in combination with Figure 1 Referring to Figure 2 , the supercharger protection device provided by the embodiment of the present application further comprises a supercharger oil inlet pipe interface 5 and a supercharger oil return pipe interface 6;

[0054] The other end of the oil storage valve 2 is connected with one end of the supercharger 3 through the supercharger oil inlet pipe joint 5, and the other end of the supercharger 3 is connected with the oil return pipe 4 through the supercharger oil return pipe joint 6.

[0055] It should be noted that the connection between the oil storage valve 2 and the supercharger 3 can be further consolidated through the supercharger oil inlet pipe joint 5, and the connection between the supercharger 3 and the oil return pipe 4 can be further consolidated through the supercharger oil return pipe joint 6.

[0056] Further, in combination with Figure 2 Referring to Figure 3 , the protection device of the supercharger provided in the embodiments of the present application further comprises a pressure sensor 7.

[0057] The pressure sensor 7 is arranged on the straight pipe section of the oil return pipe 4, and the pressure sensor 7 is controlled by the ECU.

[0058] In the embodiments of the present application, one pressure sensor 7 can be arranged on the straight pipe section of the oil return pipe 4, that is, one pressure sensor 7 is added at the oil return position of the oil return pipe 4, so that the ECU can detect whether the pressure of the flowing engine oil in the oil return pipe 4 is normal through the pressure sensor 7, and when it is detected that the pressure of the flowing engine oil is high, that is, the detected pressure value of the flowing engine oil is less than the normal pressure value, the corresponding torque limiting protection operation can be performed and the corresponding pressure fault information can be outputted to prompt that there is no engine oil lubrication at present.

[0059] Based on the above-mentioned protection device of the supercharger provided in the embodiments of the present application, correspondingly, the embodiments of the present application provide a protection method of the supercharger, as shown in Figure 4 The protection method of the supercharger is applied to the ECU in the protection device of the supercharger in any of the above-mentioned embodiments of the present application, and the protection method of the supercharger specifically comprises the following steps:

[0060] S401: When it is detected that the engine is powered on, the stop time of the engine is obtained.

[0061] In the process of specifically executing step S401, the ECU can detect the engine in real time, so as to obtain the stop time of the engine through the corresponding counter when it is detected that the engine is powered on. Specifically, the ECU starts timing through the corresponding counter when it is detected that the engine is stopped, so as to obtain the stop time of the engine when it is detected that the engine is powered on again. The counter is a counter in the ECU.

[0062] In some embodiments, after obtaining the stop time of the engine, the ECU can clear the counter, so as to control the counter to start timing again when the engine is detected to be stopped again.

[0063] S402: determining the oil storage valve opening duration of the oil storage valve according to the engine shutdown duration.

[0064] In the process of specifically performing step S402, after obtaining the engine shutdown duration, the current oil storage valve opening duration of the oil storage valve can be further determined from the pre-set oil storage valve opening durations according to the engine shutdown duration, so as to control the opening of the oil storage valve according to the determined oil storage valve opening duration.

[0065] In the embodiments of the present application, it is found by the applicant that if the engine shutdown duration is short, it means that there is still some engine oil in the intermediate shaft of the supercharger, at this time, the opening duration of the oil storage valve can be set to be short, so that a small amount of engine oil in the supercharging oil inlet pipe can flow into the intermediate shaft of the supercharger, avoiding the waste of engine oil resources; if the engine shutdown duration is long, it means that there is no engine oil in the intermediate shaft of the supercharger, the opening duration of the oil storage valve can be set to be long, so as to fully lubricate the intermediate shaft of the supercharger, thereby avoiding the damage of the supercharger caused by the rotation of the supercharger when the engine starts.

[0066] As can be seen, a plurality of engine shutdown durations and their corresponding oil storage valve opening durations can be pre-set, and a corresponding first duration table can be generated according to the engine shutdown duration and the oil storage valve opening duration of each engine, and finally the first duration table is filled into the ECU, so that the ECU can query the oil storage valve opening duration corresponding to the current engine shutdown duration from the oil storage valve opening durations stored in the first duration table after obtaining the engine shutdown duration; wherein the first duration table is shown in Table 1.

[0067] Table 1:

[0068] Engine down time h 1 3 5 10 Oil valve open time s 1 3 10 10

[0069] As a preferred mode of the embodiments of the present application, the process of determining the oil storage valve opening duration of the oil storage valve according to the engine shutdown duration can be specifically: the ECU obtains the pre-stored first duration table after obtaining the engine shutdown duration, so as to query the oil storage valve opening duration of the oil storage valve from the pre-set oil storage valve opening durations of the first duration table according to the engine shutdown duration; wherein the first duration table includes a plurality of pre-set engine shutdown durations and their corresponding oil storage valve opening durations.

[0070] For example, assuming that the ECU detects that the engine shutdown duration obtained when the engine is powered on is 3 hours, and then the oil storage valve opening duration of the oil storage valve can be determined from the first duration table according to the current engine shutdown duration, which is 3 seconds.

[0071] In summary, by pre-setting the engine shutdown duration and the corresponding oil storage valve opening duration, after determining the current engine shutdown duration, the current oil storage valve opening duration is determined from the pre-set oil storage valve opening durations according to the current engine shutdown duration, and then the opening duration of the oil storage valve is controlled according to the length of the engine shutdown time, so that the intermediate shaft of the supercharger can be lubricated in advance, and the waste of oil resources can be avoided.

[0072] In the embodiments of the present application, it is also found through research that if the engine shutdown duration is short, it means that there may still be some oil in the intermediate shaft of the supercharger, and at this time, the oil supply duration of the pre-oil pump can be set to be short, that is, the opening duration of the oil storage valve can be set to be short, so that a small amount of oil in the supercharging oil inlet pipe can flow into the intermediate shaft of the supercharger, avoiding the waste of oil resources; if the engine shutdown duration is long, it means that there is no oil in the intermediate shaft of the supercharger, and the oil supply duration of the pre-oil pump can be set to be long, that is, the opening duration of the oil storage valve can be set to be long, so as to fully lubricate the intermediate shaft of the supercharger, thereby avoiding the damage of the supercharger caused by the rotation of the supercharger when the engine starts. The pre-oil pump can be an oil pump driven by an electric motor, and the oil supply can be performed before starting the engine.

[0073] Therefore, a plurality of engine shutdown durations and corresponding oil pump oil supply durations can be pre-set, and a corresponding second duration table can be generated according to the engine shutdown duration and the oil pump oil supply duration, and finally the pre-set second duration table can be filled into the ECU, so that the ECU can query the oil pump oil supply duration corresponding to the current engine shutdown duration from the oil pump oil supply durations stored in the second duration table after obtaining the engine shutdown duration, and determine the oil pump oil supply duration as the oil storage valve opening duration of the oil storage valve; wherein the second duration table is shown in Table 2.

[0074] Table 2:

[0075] Engine down time h 1 3 5 10 Oil pump feed time s 1 3 10 10

[0076] As another implementation manner of the embodiments of the present application, the supercharger oil inlet pipe is connected with the oil pump through the main oil passage, and the process of determining the oil storage valve opening duration of the oil storage valve according to the engine shutdown duration can also be: querying the oil pump oil supply duration of the oil pump from the pre-set oil pump oil supply durations of the second duration table according to the engine shutdown duration; wherein the second duration table includes pre-set engine shutdown durations and corresponding oil pump oil supply durations of a plurality of engines; and determining the oil pump oil supply duration of the oil pump as the oil storage valve opening duration of the oil storage valve.

[0077] For example, assuming that the ECU detects that the engine has been powered on for 3 hours, the engine's shutdown duration, the corresponding oil pump oil supply duration of 3 seconds can be queried from the second duration table according to the currently acquired engine's shutdown duration, and the oil storage valve opening duration of the oil storage valve can be determined to be 3 seconds.

[0078] In summary, by pre-setting the engine's shutdown duration and the corresponding oil storage valve opening duration, after determining the current shutdown duration of the engine, the corresponding oil pump oil supply duration of the current shutdown duration of the engine is determined from the pre-set various oil pump oil supply durations, and the determined oil pump oil supply duration is determined as the current oil storage valve opening duration of the oil storage valve, and then the opening time of the oil storage valve is controlled according to the length of the engine shutdown time, which not only lubricates the intermediate shaft of the supercharger in advance, but also avoids wasting oil resources.

[0079] S403: Control the opening of the oil storage valve according to the oil storage valve opening duration of the oil storage valve, so that the oil pre-stored in the supercharger oil inlet pipe enters the supercharger through the oil storage valve, and lubricates the supercharger.

[0080] In the process of specifically executing step S403, after determining the oil storage valve opening duration of the oil storage valve, the oil storage valve can be controlled to open to lubricate the supercharger by making the oil pre-stored in the supercharger oil inlet pipe enter the supercharger through the oil storage valve, and the opening time of the oil storage valve is controlled according to the determined oil storage valve opening duration, so as to avoid wasting oil resources due to the opening of the oil storage valve for too long.

[0081] Further, in the embodiment of the present application, the supercharger provided by the embodiment of the present application is further connected with an oil return pipe, wherein the specific connection mode of the supercharger and the oil return pipe can be referred to Figure 1 The protection device of the disclosed supercharger will not be described here.

[0082] The ECU can also detect the pressure value of the oil flowing in the oil return pipe in real time through the pressure sensor arranged on the oil return pipe, and determine whether the pressure value is less than the target pressure value; if the pressure value is less than the target pressure value, perform the corresponding torque limiting operation and output the corresponding pressure fault information; if the pressure value is not less than the target pressure value, return to the step of detecting the pressure value of the oil flowing in the oil return pipe in real time through the pressure sensor arranged on the oil return pipe.

[0083] In the embodiment of the present application, the corresponding normal pressure value can be set according to the corresponding use experience, and the set normal pressure value is set as the target pressure value, so that after detecting the pressure value of the oil flowing in the oil return pipe, it can be judged whether the pressure value is less than the corresponding normal pressure value, if it is less than, it can be considered that the supercharger is currently not lubricated by oil, and the corresponding torque limiting operation needs to be performed to protect the supercharger and avoid damage to the supercharger, and the corresponding pressure fault information can also be output to prompt the corresponding technical personnel to perform corresponding inspection and maintenance in time.

[0084] It should be noted that if there is no oil flowing in the oil return pipe or the flowing oil is less, the pressure value of the oil flowing in the oil return pipe is low, at this time it can be considered that the supercharger is currently not lubricated by oil or the oil lubrication effect is poor, in order to avoid damage to the supercharger, the corresponding torque limiting operation can be performed, and the corresponding pressure fault information can be output. For example, the normal pressure value can be set to 150KPa, if the pressure value of the oil flowing in the oil return pipe is detected to be 200KPa, it can be considered that the oil flowing in the oil return pipe is normal, if the pressure value of the oil flowing in the oil return pipe is detected to be 100KPa, it can be considered that the oil currently flowing in the oil return pipe is less, that is, the current oil lubrication effect of the supercharger is poor, in order to avoid damage to the supercharger, the corresponding torque limiting operation can be performed, and the corresponding pressure fault information can be output.

[0085] The present application provides a protection method of a supercharger, the supercharger is connected with an oil storage valve, the oil storage valve is connected with a supercharger oil inlet pipe, and the supercharger oil inlet pipe is pre-stored with oil, so that when it is detected that the engine is powered on, the shutdown time of the engine is obtained, and the opening time of the oil storage valve is determined according to the shutdown time of the engine, and finally the opening time of the oil storage valve is controlled according to the opening time of the oil storage valve. As can be seen, the technical scheme provided in the embodiment of the present application can determine the opening time of the oil storage valve by detecting whether the engine is powered on in real time, and can also control the opening time of the oil storage valve according to the opening time of the oil storage valve determined according to the shutdown time of the engine, so as to open the oil storage valve to make the oil pre-stored in the supercharger oil inlet pipe pass through the oil storage valve and enter the supercharger before the engine is powered on but not started, thereby lubricating the supercharger in advance, so that when the engine is started, even if the supercharger oil inlet pipe flows poorly, the supercharger will not fail due to lack of lubrication, thereby achieving the purpose of protecting the supercharger.

[0086] Based on the above-mentioned protection device of the supercharger provided in the embodiment of the present application, correspondingly, the embodiment of the present application can also provide another protection method of the supercharger, as shown in Figure 5 The protection method of the supercharger is applied to the ECU in the protection device of the supercharger in any of the above-mentioned embodiments of the present application, and the protection method of the supercharger specifically includes the following steps:

[0087] S501: When the engine is detected to be powered on, obtain the engine downtime.

[0088] In the specific execution of step S501, the specific execution process and implementation principle of step S501 are the same as those disclosed in the above-described embodiments of this application. Figure 4 The execution process and implementation principle of step S401 are the same, which can be found in [reference]. Figure 4 The relevant content will not be repeated here in this application.

[0089] S502: Determine whether the engine shutdown time is greater than the preset shutdown time; if the engine shutdown time is greater than the preset shutdown time, proceed to step S503; if the engine shutdown time is not greater than the preset shutdown time, return to step S501.

[0090] In the embodiments of this application, the applicant has discovered that if the engine shutdown time is very short, it indicates that there is still oil on the intermediate shaft of the turbocharger, and the oil on the intermediate shaft is sufficient to allow the intermediate shaft to rotate. In other words, even if no more oil is added to the turbocharger, it will not cause wear on the turbocharger. Therefore, a corresponding preset shutdown time can be set, and the oil reservoir valve opening time corresponding to the preset shutdown time is 0s. That is, if the engine shutdown time is not greater than the preset shutdown time, then the oil reservoir valve opening time can be determined to be 0s. In other words, if the engine shutdown time is not greater than the preset shutdown time, then the oil reservoir valve does not need to be opened. The oil reservoir valve can be opened after the engine is detected to start, so that the oil pump can smoothly allow the oil to enter the turbocharger through the main oil passage, the turbocharger inlet pipe, and the oil reservoir valve.

[0091] During the specific execution of step S502, after obtaining the engine shutdown duration, before opening the oil reservoir valve, it can be determined whether the engine shutdown duration is greater than the preset shutdown duration; if the engine shutdown duration is not greater than the preset shutdown duration, return to execute step S501; if the engine shutdown duration is greater than the preset shutdown duration, it means that there is no oil on the intermediate shaft of the turbocharger, or the oil on the intermediate shaft of the turbocharger is no longer sufficient to allow the intermediate shaft to rotate, and further oil needs to be injected into the turbocharger to allow the intermediate shaft to rotate, and then step S503 can be executed.

[0092] S503: Determine the oil reservoir valve opening duration based on the engine downtime.

[0093] S504: The oil reservoir valve is opened according to the opening duration of the oil reservoir valve, so that the pre-stored engine oil in the turbocharger inlet pipe passes through the oil reservoir valve into the turbocharger to lubricate the turbocharger.

[0094] In the specific execution of steps S503-504, the specific execution process and implementation principle of steps S503-504 are the same as those disclosed in the above-described embodiments of this application. Figure 4 The execution process and implementation principle of steps S402-S403 are the same, which can be found in [reference]. Figure 4 The relevant content will not be repeated here in this application.

[0095] S505: When engine start is detected, determine whether the fuel reservoir valve is open; if the fuel reservoir valve is open, proceed to step S506; if the fuel reservoir valve is not open, proceed to step S507.

[0096] During the execution of step S505, after the ECU controls the oil reservoir valve to open according to the opening duration of the oil reservoir valve, it can continue to detect whether the engine is started. When the engine is detected to be started, in order to ensure that the oil pump can smoothly deliver oil to the turbocharger, it can further determine whether the oil reservoir valve is open. If the oil reservoir valve is open, step S506 can be executed to control the oil reservoir valve to remain open, so that the oil pump can press the corresponding oil into the main oil passage, and enter the turbocharger through the main oil passage, the turbocharger inlet pipe and the oil reservoir valve. If the oil reservoir valve is not open, step S507 can be executed to open the oil reservoir valve, so that the oil pump can press the corresponding oil into the main oil passage, and enter the turbocharger through the main oil passage, the turbocharger inlet pipe and the oil reservoir valve.

[0097] S506: Controls the oil reservoir valve to remain open.

[0098] During the execution of step S506, after the ECU detects that the engine has started, if it determines that the oil reservoir valve is in the open state, it can control the oil reservoir valve to remain in the open state, so that the oil pump can press the corresponding oil into the main oil passage, and then enter the turbocharger through the main oil passage, the turbocharger inlet pipe and the oil reservoir valve.

[0099] S507: Open the oil reservoir valve.

[0100] During the specific execution of step S507, after the ECU detects that the engine has started, if it determines that the oil reservoir valve is not in the open state, that is, the oil reservoir valve is currently closed for loading, it can control the oil reservoir valve to open, so that the oil pump can press the corresponding oil into the main oil passage, and enter the turbocharger through the main oil passage, the turbocharger inlet pipe and the oil reservoir valve.

[0101] Further, in the embodiment of the present application, during the process of controlling the opening of the oil storage valve, the ECU can also detect in real time whether there is a request for engine shutdown, and when the request for engine shutdown is detected, i.e., when the engine is stopped, the oil storage valve can be controlled to be closed, at this time, the oil still flows in the supercharger, and after the oil storage valve is closed, the oil above the oil storage valve can be stored in the supercharger oil inlet pipe, i.e., the supercharger oil inlet pipe stores the remaining oil, so that when the engine is powered on next time, the oil stored in the supercharger oil inlet pipe can be used to lubricate the supercharger in advance, further achieving the purpose of protecting the supercharger.

[0102] For each of the foregoing method embodiments, in order to simply describe, it is expressed as a combination of a series of actions, but those skilled in the art should know that the present application is not limited by the order of the described actions, because according to the present application, certain steps can be performed in other order or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0103] It should be noted that each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, it is described relatively simply, and the relevant parts refer to the part of the method embodiment.

[0104] The steps in the method of each embodiment of the present application can be adjusted, combined and deleted according to actual needs.

[0105] The modules and sub-modules in the device and terminal in each embodiment of the present application can be combined, divided and deleted according to actual needs.

[0106] In several embodiments provided by the present application, it should be understood that the disclosed terminal, device and method can be implemented by other ways. For example, the terminal embodiments described above are only schematic, for example, the division of modules or sub-modules is only a logical function division, and there can be another division way in actual implementation, for example, a plurality of sub-modules or modules can be combined or integrated into another module, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed mutual ones can be indirect coupling or communication connection through some interfaces, devices or modules, and can be electrical, mechanical or other forms.

[0107] The modules or sub-modules described as separate components may or may not be physically separate, and the components of the modules or sub-modules may or may not be physical modules or sub-modules, i.e., may be located in one place or distributed over multiple network modules or sub-modules. Some or all of the modules or sub-modules can be selected as needed to achieve the purposes of the embodiments.

[0108] In addition, each functional module or sub-module in various embodiments of the present application can be integrated into one processing module, or each module or sub-module can exist physically alone, or two or more modules or sub-modules can be integrated into one module. The integrated module or sub-module can be realized in the form of hardware or in the form of a software functional module or sub-module.

[0109] Finally, it should be noted that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations exist in any such actual relationship or order. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed or other elements inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0110] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application shall not be limited to the embodiments shown herein, but shall conform to the widest scope consistent with the principles and novel features disclosed herein.

[0111] The above description is only the preferred embodiments of the present application, and it should be noted that for ordinary skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements shall be considered as the protection scope of the present application.

Claims

1. A method for protecting a turbocharger, characterized in that, One end of an oil reservoir valve is connected to one end of the turbocharger oil inlet pipe, the other end of the turbocharger oil inlet pipe is connected to an oil pump via a main oil passage, the other end of the oil reservoir valve is connected to one end of the turbocharger, and the turbocharger oil inlet pipe pre-stores engine oil. The method includes: When the engine is detected to be powered on but not started, the downtime of the engine is obtained; The oil reservoir valve opening duration is determined based on the engine shutdown duration; wherein, determining the oil reservoir valve opening duration based on the engine shutdown duration includes: querying the oil reservoir valve opening duration from each oil reservoir valve opening duration in a pre-set first duration table based on the engine shutdown duration, or querying the oil pump supply duration from each oil pump supply duration in a pre-set second duration table based on the engine shutdown duration, and determining the oil pump supply duration of the oil pump as the oil reservoir valve opening duration; The opening of the oil reservoir valve is controlled according to the opening duration of the oil reservoir valve, so that the oil pre-stored in the oil inlet pipe of the turbocharger passes through the oil reservoir valve and enters the turbocharger under the action of gravity, so as to lubricate the turbocharger.

2. The method according to claim 1, characterized in that, The method further includes: Determine whether the engine shutdown time is greater than the preset shutdown time; If the engine shutdown duration is longer than the preset shutdown duration, the step of determining the oil reservoir valve opening duration based on the engine shutdown duration is executed.

3. The method according to claim 1, characterized in that, The method further includes: When the engine is detected to be starting, it is determined whether the oil reservoir valve is in the open state; If the oil reservoir valve is in the open state, control the oil reservoir valve to remain in the open state, so that the oil pump pressurizes the corresponding oil into the main oil passage, and enters the turbocharger through the main oil passage, the turbocharger inlet pipe and the oil reservoir valve; If the oil reservoir valve is not in the open state, open the oil reservoir valve so that the oil pump can press the corresponding oil into the main oil passage, and then enter the turbocharger through the main oil passage, the turbocharger inlet pipe and the oil reservoir valve.

4. The method according to claim 1 or 3, characterized in that, The method further includes: When the engine stops, the oil reservoir valve is closed to allow the turbocharger inlet pipe to retain the remaining engine oil.

5. The method according to claim 1, characterized in that, The turbocharger is also connected to a return oil pipe, and a pressure sensor is installed on the return oil pipe. The method further includes: The pressure sensor monitors the pressure of the oil flowing in the return pipe and determines whether the pressure is less than the target pressure. If the pressure value is less than the target pressure value, perform the corresponding torque limiting operation and output the corresponding pressure fault information.

6. A protection device for a turbocharger, characterized in that, The device includes: a turbocharger inlet pipe, an oil reservoir valve, a turbocharger, an oil return pipe, and an ECU; One end of the oil reservoir valve is connected to one end of the turbocharger oil inlet pipe, and the other end of the turbocharger oil inlet pipe is connected to the oil pump through the main oil passage. The other end of the oil storage valve is connected to one end of the booster, and the other end of the booster is connected to the oil return pipe; The oil reservoir valve is controlled by the ECU, which is used to execute the turbocharger protection method according to any one of claims 1-5.

7. The apparatus according to claim 6, characterized in that, The device also includes a pressure sensor; The pressure sensor is installed on the straight section of the return oil pipe, and the pressure sensor is controlled by the ECU.

8. The apparatus according to claim 7, characterized in that, The device also includes: a turbocharger inlet pipe connector and a turbocharger return pipe interface; The other end of the oil storage valve is connected to one end of the turbocharger via the turbocharger inlet pipe joint; The other end of the turbocharger is connected to the return oil pipe through the turbocharger return oil pipe interface.

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